24年10月17日文献情报（20篇）

24年10月17日文献情报

1. 题目: Remediation of PBDE-Contaminated soil using biochar-based bacterial consortium QY2Y

文章编号: N24101720
期刊: Journal of Cleaner Production
作者: Zhanyu Guo, Ruxia Chen, Xiaofang Ouyang, Hua Yin
更新时间: 2024-10-17
摘要: Biochar-immobilized microbial technologies hold substantial promise for the remediation of environmental contaminants. However, the understanding of remediation efficiency and the operation of microbial consortia in complex soil environments using biochar as a carrier remains limited. In this study, we explored the impacts of biochar combined with bacterial consortium QY2Y (consisting of Chitinophaga sp. MH-1, Achromobacter sp. YH-1, Methylobacterium sp. ZY-1 and Sphingomonas sp. GY-1) on BDE-47 dissipation in contaminated soil, as well as its effects on soil-plant systems. The findings indicated that the immobilization of biochar and QY2Y not only stimulated the biodegradation of BDE-47 (61.50%) but also decreased the bioavailability of BDE-47, subsequently reducing the concentration of BDE-47 in the edible portion of rapeseed (Brassica napus L.) by 82.00%. In addition, the combined treatment notably increased soil pH, enhanced the physicochemical properties and nutrient conditions of the soil, and amplified soil dehydrogenase, catalase, urease, and acid phosphatase activities by 58.72%, 69.25%, 54.24%, and 74.74%, respectively. The application of biochar-based QY2Y improved the soil microbial community structure, bolstered the interspecific symbiotic and cooperative relationships, and restructured the keystone taxa. The key species microbes had direct and significant positive effects on BDE-47 degradation, soil nutrients, and soil enzyme activity. This study deepens our understanding of the potential applications of immobilized microbial consortia in treating PBDE-contaminated soils and offers guidance for the management and remediation of contaminated soils.
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2. 题目: Nitrogen Self-Doped Biochar Sustainably Self-Activated from Cactus Solidified with Freeze-Drying Strategy for Lightweight Supercapacitor

文章编号: N24101719
期刊: ACS Sustainable Chemistry & Engineering
作者: Chun-Feng Xue, Le Wang, Li-Xiao Yang, Jun Li, Xiao-Hong Li, Xiao-Gang Hao
更新时间: 2024-10-17
摘要: To assemble lightweight devices for portable electronics, an electrode material with matched surface area and density is essential to balance the mass and volume specific capacitance. Herein, the biochar is directly self-activated from cactus pretreated by freeze-drying. The solidified pore structure of the pretreated cactus is easy to maintain during the subsequent carbonization process. As an interesting result, the typical biochar from freeze-dried cactus BFC-700 shows the highest specific surface area (904.4 m² g^–1) and micropore volume (0.36 cm³ g^–1) among the samples, which are quadruple those of the control sample BC-700. It shows well-balanced mass specific capacitance and volume specific capacitance (528.3 F g^–1, 464.9 F cm^–3). In a two-electrode system with 1.0 M H₂SO₄ as the electrolyte, an energy density of 24.3 Wh kg^–1 is achieved at a power density of 137.7 W kg^–1. The capacitance retention is calculated to be 95.5% after 10,000 cycles of charge/discharge at a current density of 5.0 A g^–1. It can be assembled into a coin-type (CR2025) symmetrical supercapacitor and can power 2.0 V bulbs. The results demonstrate that the freeze-drying treatment is suitable for biomass precursors with water-rich and mucilaginous structure to be converted into biochars. This work provides a green and sustainable method for preparing biochar electrodes with balanced capacitance properties.
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3. 题目: The Influence of Seawater on Fe(II)-Catalyzed Ferrihydrite Transformation and Its Subsequent Consequences for C Dynamics

文章编号: N24101718
期刊: Environmental Science & Technology
作者: Yanjun Dong, Jialin Wang, Chao Ma, Aaron Thompson, Congqiang Liu, Chunmei Chen
更新时间: 2024-10-17
摘要: Short-range-ordered minerals like ferrihydrite often bind substantial organic carbon (OC), which can be altered if the minerals transform. Such mineral transformations can be catalyzed by aqueous Fe(II) (Fe(II)_aq) in redox-dynamic environments like coastal wetlands, which are inundated with seawater during storm surges or tidal events associated with sea-level rise. Yet, it is unknown how seawater salinity will impact Fe(II)-catalyzed ferrihydrite transformation or the fate of bound OC. We reacted ferrihydrite with Fe(II)_aq under anoxic conditions in the absence and presence of dissolved organic matter (DOM). We compared treatments with no salts (DI water), NaCl–KCl salts, and artificial seawater mixes (containing Ca and Mg ions) with or without SO₄^2–/HCO₃^–. Both XRD and Mössbauer showed that NaCl–KCl favored lepidocrocite formation, whereas Ca²⁺/Mg²⁺/SO₄^2–/HCO₃^– ions in seawater overrode the effects of NaCl–KCl and facilitated goethite formation. We found that the highly unsaturated and phenolic compounds (HuPh) of DOM selectively bound to Fe minerals, promoting nanogoethite formation in seawater treatments. Regardless of salt presence, only 5–9% of Fe-bound OC was released during ferrihydrite transformation, enriching HuPh relative to aliphatics in solution. This study offers new insights into the occurrence of (nano)goethite and the role of Fe minerals in OC protection in coastal wetlands.
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4. 题目: Simultaneous removal of nitrate, manganese, zinc, and bisphenol A by a biofilm reactor with β-CD modified corn stover biochar and PU sponges: Performance and microbial community response

文章编号: N24101717
期刊: Environmental Research
作者: Miqi Ren, Junfeng Su, Yihan Bai, Yue Wang, Chenxi Hou, Ying Zhang
更新时间: 2024-10-17
摘要: In the present study, a biofilm reactor with manganese (Mn) redox cycling was established to remove nitrate (NO₃^--N), bisphenol A (BPA), zinc (Zn(II)), and Mn(II) using β-cyclodextrin (β-CD) modified corn stover biochar (BC) and polyurethane sponges loaded with Cupriavidus sp. HY129 and Pantoea sp. MFG10. At C/N = 2.0, HRT = 6 h, Mn(II) = 10.0 mg L^-1, and BPA and Zn(II) concentrations = 1.0 mg L^-1, the removal efficiencies of NO₃^--N, Zn(II), BPA, and Mn(II) were 81.5%, 86.5%, 87.9%, and 75.5%, respectively. The outcomes demonstrated the success that the addition of β-CD could accelerate electron transfer activity and the denitrification process. The remediation of BPA and Zn(II) was mainly through the adsorption of bioprecipitation generated by reactor operation. The bioreactor could preserve the stability of the biological community and the expression of pertinent functional genes under the coercion of BPA and Zn(II).
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5. 题目: How biochar curbs the negative impacts of plastic mulching on soil enzymes and microorganisms while elevating crop yields in ridge-furrow systems

文章编号: N24101716
期刊: Environmental Research
作者: Peng Zhang, Dongmei Wang, Zezhou Zhang, Xinyu Liu, Qiao Guo
更新时间: 2024-10-17
摘要: Ridge-furrow tillage is an important tillage and yield enhancement method used in dry farming areas; however, the spatial characteristics of the soil microenvironment under ridge-furrow tillage and the response of crop yields to mulching and biochar addition are not known. In this study, we conducted a three-year field experiment in which mulch and biochar, alone or combined, were introduced into ridge-furrow tillage system to explore their interactive effects on soil enzyme activities, bacterial communities, functional genes, and crop yields. The findings reveal significant spatial differences in soil physicochemical composition, enzyme activity, microbial communities, and functional genes under ridge-furrow tillage, which are further exacerbated by the addition of mulching and biochar. Under the premise of ridge-furrow tillage, both mulching and biochar addition reduce the α diversity of bacterial communities. Mulching simplifies the bacterial network, while biochar addition has the opposite effect. Mulching and biochar addition increase the relative abundance of carbon, nitrogen, and phosphorus functional genes and accelerate nutrient cycling, especially on the ridges. Mulching significantly improves crop yield but is detrimental to alkaline phosphatase activity and the abundance of the gene function. The addition of biochar mitigates the harm of mulching and further increases alfalfa yield. These findings not only provide scientific support for optimizing ridge-furrow tillage but also deepen our comprehensive understanding of the soil biochemical environment after the addition of mulching and biochar, further revealing their positive effects on yield formation.
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6. 题目: Effects of aged biochar additions at different addition ratios on soil greenhouse gas emissions

文章编号: N24101715
期刊: Science of the Total Environment
作者: Yongchun Zhou, Zili Zhao, Danyang Li, Yapeng Wang, Jinrong Yang, Wei Han, Song Li
更新时间: 2024-10-17
摘要: Biochar addition is effective in reducing soil greenhouse gas (GHG) emissions, but it's essential to evaluate whether aged biochar retains this capability as its properties change over time. However, research comparing the effects of fresh and aged biochar on soil GHG emissions is limited. Moreover, exploring the priming effect of biochar on native soil organic carbon (SOC) mineralization is crucial for revealing the effect mechanism on soil CO₂ emission. However, research investigating the priming effects of aged biochar is limited. In this study, the effects of aged biochar addition on soil physicochemical properties, GHG emissions, and global warming potential (GWP) were examined through an incubation experiment with three treatments: (1) soil only (CK), (2) 1 % aged maize straw biochar addition (HBC1) and (3) 4 % aged maize straw biochar addition (HBC4), and then their effects were compared with those of fresh biochar from our previous research. ¹³C tracer technology was used to assess the priming effect of aged biochar on native SOC mineralization. Results showed that aged biochar improved soil physicochemical properties. Compared to CK, HBC1 and HBC4 reduced CO₂ emissions by 28.02 % and 20.15 %, respectively, and reduced N₂O emissions by 61.54 % and 66.39 %. HBC4 significantly increased CH₄ emission, whereas HBC1 reduced it. HBC1 and HBC4 reduced GWP by 29.01 % and 21.41 %, respectively. Overall, aged biochar demonstrated a greater reduction effect compared to fresh biochar at the 1 % addition ratio. The CO₂ reduction is attributed to the negative priming effect of aged biochar on native SOC mineralization. The reduction in N₂O emissions is attributed to aged biochar promoting microbial nitrogen fixation and reducing the ratio of denitrification to nitrification. The variation in CH₄ emissions reflects differing dominant factors influencing CH₄ emission across varying addition ratios. In conclusion, 1 % aged biochar addition demonstrates a more favorable long-term effect on mitigating GHG emissions.
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7. 题目: Bleached cellulose biochars as a sustainable alternative for oilfield-produced water (OPW) treatment and environmental remediation

文章编号: N24101714
期刊: Separation and Purification Technology
作者: Lauren M M Machado, Daniele Perondi, Christian Manera, Marcelo Godinho, Gabriela C Collazzo, Luis F O Silva, Marcos L S Oliveira, Naushad Ahmad, Sonaimuthu Mohandoss, Guilherme L Dotto
更新时间: 2024-10-17
摘要: Eucalyptus, a renewable and fast-growing raw material widely used in the paper industry, has great potential for new applications beyond papermaking. Bleached eucalyptus pulp, traditionally used in the pulp industry, has proved to be a promising alternative for removing complex organic compounds such as naphthenic acids (NAs), often found in oil-produced water (OPW). This study aimed to optimize the production of biochars from bleached eucalyptus pulp through pyrolysis at 700, 800, and 900 °C and to correlate the resulting properties with the ability to adsorb NA at low concentrations and in acidic and alkaline media. The research explores realistic environmental scenarios where naphthenic acids may be present in dilute concentrations after initial treatments. The biochars were characterized by their micro and mesoporous structures, amorphous structures, and distinct functional groups and were evaluated in simulated effluents. Biochar B900 reached a maximum adsorption capacity of 35 mg/g at pH 4 and 25 °C, excelling in acidic environments, while at pH 8, biochar B700 showed better performance. The PVSDM model revealed that mass transfer and pore diffusion coefficients increased with increasing pyrolysis temperature. The Langmuir model was the best fit for the experimental data. The biochar produced at 900 °C had the highest specific surface area (1,041.55 m²/g) and pore volume (0.56 cm³ g⁻¹), favoring its adsorption capacity. Although the biochar shows good initial efficiency, the progressive reduction in adsorption capacity over the cycles suggests limited reusability, highlighting the need for optimization in the regeneration process to improve its economic viability in wastewater treatment.
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8. 题目: Biochar-driven fouling mitigation in sustainable microalgal-bacterial membrane bioreactors

文章编号: N24101713
期刊: Journal of Membrane Science
作者: Fei Huang, Jiaheng Teng, Yu Zhao, Shangfei Li, Hongjun Lin, Xiang Cai, Meijia Zhang
更新时间: 2024-10-17
摘要: Microalgal-bacterial membrane bioreactor (MB-MBR) have emerged as a crucial technology for sustainable wastewater treatment. However, membrane fouling caused by free microalgae remains a major obstacle to their cost-effective operation. This study investigated the impact of biochar addition on membrane fouling in MB-MBR. The findings indicated that biochar significantly reduced membrane fouling, primarily due to the enlargement of floc size and the reduction of soluble microbial products (SMP). Detailed analyses suggested that biochar's adsorptive properties and its effect on decreasing the abundance of algae and bacteria species, such as Proteobacteria and Leptolyngbya, which promote fouling, are key factors. This alteration enhanced specific amino acid metabolic pathways, thereby reducing SMP production and fouling potential. Consequently, adhesion interaction energy of the flocs and membrane fouling were both diminished. This study demonstrated that biochar addition is an effective strategy for mitigating membrane fouling in MB-MBR systems, providing a theoretical foundation for their stable and sustainable operation.
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9. 题目: Two-Dimensional Liquid Chromatography Tandem Mass Spectrometry Untangles the Deep Metabolome of Marine Dissolved Organic Matter

文章编号: N24101712
期刊: Environmental Science & Technology
作者: Stilianos Papadopoulos Lambidis, Tilman Schramm, Karoline Steuer-Lodd, Shane Farrell, Paolo Stincone, Robin Schmid, Irina Koester, Ralph Torres, Thorsten Dittmar, Lihini Aluwihare, Carsten Simon, Daniel Petras
更新时间: 2024-10-17
摘要: Dissolved organic matter (DOM) is an ultracomplex mixture that plays a central role in global biogeochemical cycles. Despite its importance, DOM remains poorly understood at the molecular level. Over the last decades, significant efforts have been made to decipher the chemical composition of DOM by high-resolution mass spectrometry (HR-MS) and liquid chromatography (LC) coupled with tandem mass spectrometry (MS/MS). Yet, the complexity and high degree of nonresolved isomers still hamper the full structural analysis of DOM. To address this challenge, we developed an offline two-dimensional (2D) LC approach using two reversed-phase dimensions with orthogonal pH levels, followed by MS/MS data acquisition and molecular networking. 2D-LC-MS/MS reduced the complexity of DOM, enhancing the quality of MS/MS spectra and increasing spectral annotation rates. Applying our approach to analyze coastal-surface DOM from Southern California (USA) and open-ocean DOM from the central North Pacific (Hawaii), we annotated in total more than 600 structures via MS/MS spectrum matching, which was up to 90% more than that in iterative 1D LC-MS/MS analysis with the same total run time. Our data offer unprecedented insights into the molecular composition of marine DOM and highlight the potential of 2D-LC-MS/MS approaches to decipher the chemical composition of ultracomplex samples.
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10. 题目: Pollution of organophosphorus pesticides in the Dongting Lake, China and its relationship with dissolved organic matter: Occurrence, source identification and risk assessment

文章编号: N24101711
期刊: Environmental Research
作者: Xiangcheng Liu, Jiao Cao, Wenyu Zhao, Jingyi Jiang, Minghong Cai, Haipeng Wu, Huipeng Zhu, Xiaona Liu, Lei Li
更新时间: 2024-10-17
摘要: The escalating global demand for food and industrialization has placed significant pressure on the integrity and management of inland lake ecosystems. Herein, the organophosphorus pesticides (OPPs) pollution status and their relationship with dissolved organic matter (DOM) in Dongting Lake were investigated to identify the ecological risks and potential sources of OPPs. The total concentrations of 18 detected OPPs were in the range of 13.49–375.24 ng/L, with higher concentration observed in east and west lake regions. Among these, fenthion was the dominant contributor, accounting for 64% of total OPPs, posing significant ecological risk to aquatic organisms. Nearly all of sites showed high combined risk of total OPPs. Parallel factor analysis (PARAFAC) and fluorescence regional integration (FRI) technique showed that DOM was mainly composed of terrestrial humic-like and tryptophan-like substances. Moreover, correlation analysis revealed a close association between DOM optical parameters and OPP concentrations. Specifically, OPPs exhibited a significantly positive correlation with tyrosine-like substances, while displaying a negative correlation with fulvic acid-like substances. These results indicated that OPP concentrations may decrease with increasing humification levels and declining tyrosine-like substance contents. This study underscores the critical role of DOM in assessing the occurrence and sources of OPPs in aquatic environments, providing valuable insights for effective environmental management strategies.
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11. 题目: Effects of different low-temperature pyrolysis treatments on the biotoxicity of biochar derived from tobacco stalks

文章编号: N24101710
期刊: Journal of Environmental Chemical Engineering
作者: Hong-Chao Hao, Shuo Chen, Zi-Ying Hu, Hong Jiang
更新时间: 2024-10-17
摘要: The pyrolytic treatment of tobacco stalk (TS) waste results in the production of a large amount of biochar, which is usually used for environmental remediation. However, little attention has been given to the effects of different pyrolysis methods on the biotoxicity of TS biochar. This study examined the effects of three different pyrolysis methods at 350 °C (fast pyrolysis, slow pyrolysis, and low-temperature carbonization) on the biotoxicity of TS biochar (Escherichia coli (E. coli) growth and wheat germination). The results revealed that the dissolved organic matter (DOM) of the three types of biochar promoted the growth of E. coli, and the maximum growth of E. coli was ranked as DOM-F350 > DOM-S350 > DOM-350. However, the DOM inhibited the growth of the wheat seeds, with the growth index (below 0.8) of the wheat seeds ranked as DOM-350 > DOM-F350 > DOM-S350. The alkali metal content, pH and humus-like substance content of biochar may be responsible for the biotoxicity of biochar through various mechanisms. In addition, TS-S350 exhibited greater biotoxicity than did TS-F350 because of the greater content of toxic nitrogen-containing organic compounds. These findings can provide reliable theoretical guidance for the effective management and safe utilization of TS waste.
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12. 题目: Enhanced Simazine Degradation via Peroxymonosulfate Activation Using Hemin-Doped Rice Husk Biochar as a Novel Fe/N–C Catalyst

文章编号: N24101709
期刊: Chemosphere
作者: Aaron Albert Aryee, Md Abdullah Al Masud, Won Sik Shin
更新时间: 2024-10-17
摘要: The presence of herbicides, including simazine (SIM), in aquatic environments pose significant threats to these ecosystems, necessitating a method for their removal. In this study, a hemin-doped rice husk-derived biochar (RBC@Hemin_20%) was synthesized using a simple, one-step pyrolysis, and its degradation efficiency towards SIM via peroxymonosulfate (PMS) was assessed. Under optimized conditions (hemin loading = 20 wt%, SIM = 0.5 ppm, RBC@Hemin_20% catalyst = 0.2 g L⁻¹, PMS = 2.0 mM, and pH = 5.84 [unadjusted]), RBC@Hemin_20%, as an Fe/N–C catalyst, could activate PMS to achieve >99% degradation of SIM. Based on radical scavenger and electron spin resonance spectroscopy (ESR) experiments, both radical (^•OH and SO₄^•−) and non-radical (such as singlet oxygen, ¹O₂) mechanisms and electron transfer were involved in the degradation system. Significant mineralisation (97.3%) and reusability efficiency (∼74.1% SIM degradation after 4 applications) were exhibited by the RBC@Hemin_20%/PMS system, which also maintained a remarkable degradation efficiency in tap-, river-, and ground-water. Additionally, the RBC@Hemin_20%/PMS system exhibited rapid degradation of tetracycline (TC) and diclofenac (DCF), indicating its prospects in the degradation of other organic pollutants of aquatic environments. The plausible degradation mechanism pathways of SIM are proposed based on identified intermediates. Finally, the toxicity of these intermediate products is analysed using the Ecological Structure Activity Relationship (ECOSAR) software. It is expected that this study will expand the current knowledge on the synthesis of efficient biomass-based Fe/N-C composites for the removal of organic pollutants in water.
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13. 题目: Responses of soil organic carbon, microbial biomass carbon, and microbial quotient to ground cover management practices in Chinese orchards: a data synthesis

文章编号: N24101708
期刊: Plant and Soil
作者: Weiting Ding, Jinmei Chen, Yeru Wu, Jianuo Mu, Zhidong Qi, Francis Zvomuya, Hailong He
更新时间: 2024-10-17
摘要:

Background and aims

Soil microbial quotient (SMQ), the ratio of soil microbial biomass carbon (SMBC) to organic carbon (SOC), is considered a key predictor of soil quality. However, the variations in SMBC and SMQ under ground cover management (GCM) in orchard systems remain poorly understood.

Methods

This study established a national database of SOC, SMBC, and SMQ, as well as associated climatic and edaphic factors, and agronomic practices from 288 field experiments across China. We leveraged the data to assess the responses and controlling factors of SOC, SMBC, and SMQ to GCM practices using a meta-analysis.

Results

Our findings demonstrate that GCM significantly increases SOC (20%), SMBC (35%), and SMQ (19%) compared to conventional clean (bare ground) tillage. The categorical meta-analyses reveal that the response varies with management and environmental factors. The effect of GCM on SOC, SMBC, and SMQ is prominent in tropical rainy areas with low SOC content (< 10 g kg⁻¹), neutral soils (pH = 6–8), full cover with live grass, and shallow soils. Furthermore, the random forest modeling further demonstrates that soil depth is the dominant driver for responses of SOC, SMBC, and SMQ to GCM. The GCM-induced changes in SOC, SMBC and SMQ decline significantly as soil depth increased. The significant increase in SMQ was mainly observed in the upper 40 cm soil layer, which indicates that the ability of microorganisms to assimilate carbon decreases with soil depth.

Conclusion

Overall, we conclude that GCM practices could improve carbon sink and boost biological soil health in Chinese orchards. The response, however, varied depending on local environmental factors. We also highlight that a careful assessment of the site-specific conditions is needed to determine the appropriate GCM practices for potential benefits.

Graphical

1. microbes assimilate SOC; 2. SOC decomposition releases CO₂; 3. microbial growth produces CO₂; and 4. the microbial necromass and byproducts are returned to soil. Numbers in parentheses represent the sample size. SOC, soil organic carbon; SMBC: soil microbial biomass carbon; SMQ: the ratio of SMBC to SOC; MAT, mean annual temperature; MAP, mean annual precipitation; TN, total nitrogen.

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14. 题目: Insight into the co-hydrothermal humification of corn stalk and sewage sludge for enhanced nitrogen-rich humic acid production

文章编号: N24101707
期刊: Frontiers of Environmental Science & Engineering
作者: Zhihua Li, Yuchao Shao, Wenjing He, Zhangrui Luo, Weizhong Huo, Rong Ye, Wenjing Lu
更新时间: 2024-10-17
摘要:

The high organic carbon content in corn stalks (CS) and the rich nitrogen resources in sewage sludge (SS) render them ideal for the hydrothermal production of nitrogen-enriched hydrothermal humic acid (HHA). This study conducted co-hydrothermal humification experiments using varying ratios of CS to SS under two distinct mixing modes: 1) co-hydrothermal carbonization of CS and SS, followed by alkaline hydrothermal humification to yield HHA, and 2) mixing CS-derived hydrochar with SS, followed by alkaline hydrothermal humification to yield HHA. The results indicated no significant difference in HHA yield between the modes when using equivalent raw material ratios. Importantly, the HHA produced did not pose a heavy metal risk. However, HHA from mode (1) had nearly double the nitrogen content compared to mode (2) and contained more valuable metal elements. The study confirmed that while co-hydrothermal humification of CS and SS did not significantly enhance HHA yield, it did markedly increase nitrogen content. Furthermore, HHA yield decreased with increasing SS content in the raw materials, likely due to SS's high ash content (52.4 wt%). In contrast, the nitrogen content in HHA increased with higher SS content, rising from 2.0 wt% to 3.8 wt% in mode (1) and from 1.1 wt% to 2.3 wt% in mode (2). Upon comprehensive analysis of both modes, the study suggests that mode (1) is more promising for engineering applications, as it facilitates the efficient disposal of a larger amount of SS.

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15. 题目: Responses of various organic carbon pools to elevated temperatures in soils

文章编号: N24101706
期刊: Science of the Total Environment
作者: Yafeng Han, Chenchen Qu, Xiping Hu, Pan Sun, Jie Kang, Peng Cai, Xingmin Rong, Wenli Chen, Qiaoyun Huang
更新时间: 2024-10-17
摘要: Soil organic carbon (SOC) and its composition may be vulnerable to the effects of microbial degradation and various environmental stresses. Hitherto, the responses of various SOC pools to warming have rarely been explored. In this study, an incubation experiment was performed with top soils (0–20 cm) from Alfisol and Ultisol at three temperatures (15, 30 and 45 °C). Warming significantly decreased the contents of SOC, particulate organic carbon (POC), mineral associated organic carbon (MAOC) and iron bound organic carbon (Fe–OC) to different degrees. However, the proportion of MAOC and Fe–OC to SOC increased by 3.6–13.3 % and 3.8–7.3 %, respectively, with rising temperature, suggesting that the temperature response of MAOC and especially Fe-OC mineralization is lower than other SOC pools. From the analysis of the Fe-OC structure by various spectroscopic techniques, it was found that elevated temperature increased the proportion of aromatic C but decreased that of aliphatic C to Fe-OC. Soil pH, identified as the most important environmental variable for controlling Fe-OC chemical structure by Mantel test, exhibited a significant negative correlation with aliphatic Fe-OC and positive correlation with aromatic Fe-OC. Synchrotron radiation–based Fourier transform infrared (SR–FTIR) spectroscopy affirmed the higher binding strength of aromatic C with Fe oxides than aliphatic C in both soils. In addition, elevated temperature induced the increase and decrease of K-strategy bacteria and r-strategy bacteria, respectively, indicating warming slowed the bacterial growth, which could produce less necromass carbon for the association of Fe oxides and caused the decrease in Fe-OC. In summary, warming-induced changes in pH and microbial community structure can lead to a decrease in Fe-OC content, whereas the increased proportions confirmed that Fe-OC remains the most stable OC pool facing with short-term soil warming. These findings are helpful for better understanding the importance of soil minerals, especially Fe oxides, in the regulation of soil C sequestration under the context of climate change.
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16. 题目: Different patterns of bacterioplankton in response to inorganic and organic phosphorus inputs in freshwater lakes - a microcosmic study

文章编号: N24101705
期刊: Water Research
作者: Tianhong Tu, Le Li, Wenkai Li, Shan Zhang, Hui Zhong, Gang Ge, Lan Wu, Yantian Ma
更新时间: 2024-10-17
摘要: Phosphorus (P) is a limiting factor in fresh waters and is also the main cause of water eutrophication and deterioration, However, the practical effect of elevated P level on bacterioplankton is less evaluated. In this study, we investigated the bacterioplankton in a 96 hours microcosm experiment with P additions in two forms (organic/inorganic P, OP/IP) and three levels (final conc., 0.040, 0.065 and 0.125 g/L), aiming to find out the response pattern of bacterioplankton in coping with the increasing P levels. Results showed a more dramatic change of water properties and bacterioplankton between P forms (OP and IP) than among the addition levels, and a more remarkable effect of OP addition than the IP. Both OP and IP treatments significantly decreased the water pH, dissolved oxygen (DO), Electrical Conductivity (EC), Nitrate Nitrogen (NO₃^--N) and Total Organic Carbon (TOC), and reduced the α-diversity of bacterioplankton and relative abundance of Cyanobacteria, but increased the abundance of Proteobacteria. The IP addition decreased Actinobacteria abundance (especially for HgcI) and showed higher denitrification potentials, while the OP addition depressed the Bateroidota and exhibited lowed methylotrophic functions, but such trends decreased with increasing addition concentrations. The network analysis showed that both IP and OP additions increased the proportion of positively correlated edges and reduced the network complexity and stability, but the OP network was more stable than the IP network. The study clarifies the response pattern of bacterioplankton to the P input with different forms and levels, and deepens our understanding of the eutrophication process, which provides a scientific basis for the management and control of freshwater lakes facing eutrophication.
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17. 题目: Characterization of Natural and Anthropogenic Dissolved Organic Matter in the Yangtze River Basin Using FT-ICR MS

文章编号: N24101704
期刊: Water Research
作者: Cuiping Ning, Shuai Sun, Yuan Gao, Huaijun Xie, Lidong Wu, Haijun Zhang, Jiping Chen, Ningbo Geng
更新时间: 2024-10-17
摘要: Dissolved organic matter (DOM) is a complex mixture that plays a crucial role in global carbon cycling and climate dynamics. Understanding the chemical composition of DOM is crucial for studying its biogeochemical behavior. However, identifying individual DOM molecules is challenging. Here, using ultrahigh-resolution Fourier transform ion cyclotron resonance mass spectrometry and an in-house database, we developed a framework to investigate DOM characteristics in natural water. Through the developed approach, we successfully identified thousands of individual DOM molecules in the water bodies of the Yangtze River Basin. For the first time, the proportions of natural and anthropogenic organics within DOM were revealed. In total, 9557 unambiguous molecular formulas were assigned to DOM in the Yangtze River Basin. The proportions of CHNO and CHOS compounds increased from upstream to downstream regions. Moreover, 1099 DOM compounds were tentatively identified, with 85% being endogenous organics and 15% being exogenous organics. Notably, lipids and pharmaceuticals and personal care products were the most frequently detected endogenous and exogenous compounds. The spatial variation of the identified DOM indicated anthropogenic discharges considerably increased both the number and abundance of DOM in the downstream Yangtze River Basin. This study highlighted the importance of anthropogenic impacts on DOM in water.
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18. 题目: Molecular insights into the degradation of organic matter from secondary swine wastewater effluent: A comparative study of advanced oxidation processes

文章编号: N24101703
期刊: Chemical Engineering Journal
作者: Lanfeng Li, Niannian Sun, Siwei Peng, Qiyuan Yang, Peng Yang, Hao Zhou, Jing Ai, Hang He, Dongsheng Wang, Weijun Zhang
更新时间: 2024-10-17
摘要: Advanced oxidation processes (AOPs) are promising for the treatment of secondary swine wastewater effluents, however, the molecular-level understanding of effluent organic matter (EfOM) removal and transformation during AOPs is limited. This study employed molecular-level characterization based on Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) and bulk characterizations to investigate these processes in various AOPs, including Cu-Fenton, UV-Cu-Fenton, Fenton, UV-Fenton, and UV/H₂O₂ treatments. Our findings revealed that the removal rates of dissolved organic carbon and EfOM molecules follow the sequence of UV-Fenton > Fenton > UV-Cu-Fenton > UV/H₂O₂ > Cu-Fenton, correlating with the rates of H₂O₂ decomposition during reactions. AOPs with faster H₂O₂ decomposition, indicative of higher reactive oxygen species generation, predominantly mineralize rather than transform EfOM. Linkage analysis highlighted oxygen addition and deamination as the primary transformation reactions, with variations in the dominance levels of these reactions across different AOPs. Recalcitrant molecule, particularly CHNO and CHO types, including low-molecular-weight carboxyl-rich alicyclic molecules, pose challenges in treatment. To enhance the efficacy of secondary effluent treatment, strategies focusing on the targeted removal of such recalcitrant EfOM should be developed. This study provided new insights into the selection and optimization of AOPs for secondary swine wastewater effluent treatment.
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19. 题目: Mechanistic insights and performance evaluation of ZnFe-Modified bovine manure biochar in activating peroxymonosulfate for efficient thiamethoxam degradation: A combined DFT calculation and degradation pathway analysis

文章编号: N24101702
期刊: Chemical Engineering Journal
作者: Qiao Zhou, Shenglan Wang, Chao Zhang, Yuechi Lin, Mengjie Pu, Xinzhi Wang, Shibo Zhu, Huizhen Chen, Zhe Zhang, Mingzhi Huang
更新时间: 2024-10-17
摘要: The study explored the degradation of thiamethoxam (THM) in water using modified bovine manure biochar as a catalyst for the first time, due to its potential harm to living organisms and frequent detection in natural water bodies. Experimental findings revealed that the rate constants for peroxymonosulfate (PMS)-catalyzed THM degradation by bovine manure biochar modified with ZnCl₂ and K₂FeO₄ (ZnFeBC) increased by 76.78 times compared to unmodified biochar (BC), achieving a 100% degradation rate within 60 min. ZnFeBC exhibited excellent PMS activation performance across various pH levels. XPS characterization and Density Functional Theory (DFT) calculations have revealed that Fe element cycling occurs on the ZnFeBC surface, resulting in increased charge transfer rates at the reaction interface. The main active sites responsible for PMS activation were found to be Fe⁰ and Fe₃O₄. The degradation mechanism of THM by the ZnFeBC/PMS system involved SO₄•^-, •OH, ¹O₂ and electron transfer. This catalyst demonstrated strong pH adaptability and outstanding catalytic degradation capabilities for various pollutants, making it highly suitable for widespread wastewater treatment applications, while also providing a new way for resource reutilization of bovine manure.
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20. 题目: A Recyclable and High Porosity Vinasse-Based Biochar with Enhanced Superficial Active Sites for Antibiotics Recovery

文章编号: N24101701
期刊: Journal of Environmental Chemical Engineering
作者: Xuesong Zhou, Kai Jiang, Bao Zhichao
更新时间: 2024-10-17
摘要: Antibiotic pollution in water bodies is a global environmental issue. For adsorbing antibiotic residues, biochar produced by direct high temperature pyrolysis faces challenges in balancing adsorption capacity and recyclability due to limited active sites. Thus, a recyclable and high-porosity vinasse-based biochar was developed via co-pyrolysis of K₂FeO₄ one-pot method. The co-pyrolysis biochar's surface area was augmented by 143 times, from 3.4 m²/g to 490.9 m²/g. The maximum theoretical adsorption capacity of the co-pyrolysis biochar for norfloxacin (NOR) increased from 4.4 mg/g to 364.9 mg/g, an approximate 83-fold enhancement. The surface of the biochar was rich in active groups (C-O, C-Fe, and -OH), which acted as the active sites to enhance the adsorption of NOR. The adsorption mechanism involved a variety of interactions, including pore-filling, hydrogen bond, π-π interactions, surface complexation, and electrostatic interactions. Importantly, the biochar is magnetic and can be recycled attributed to the generation of ferriferous oxides during the carbonization. After three cycles of reuse, the adsorption efficiency of vinasse-based biochar for NOR still exceeded 70%. Such biochar prepared by this facile and feasible co-pyrolysis method show the potential to enhance active sites for removal of antibiotic from aquatic systems.
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