24年12月16日文献情报（11篇）

24年12月15日文献情报

1. 题目: Sulfur-functionalized sawdust biochar for enhanced cadmium adsorption and environmental remediation: A multidisciplinary approach and density functional theory insights.

文章编号: N24121607
期刊: Journal of Environmental Management
作者: M M M Ahmed, Chih-Hao Liao, S Venkatesan, Yu-Ting Liu, Yu-Min Tzou, Shih-Hao Jien, Ming-Chang Lin, Yi-Cheng Hsieh, Ahmed I Osman
更新时间: 2024-12-16
摘要: Pristine biochar typically exhibits limited capacity for heavy metal adsorption due to its inadequate pore development and insufficient surface functionality. This study introduces an innovative chemical strategy to enhance the surface of sawdust biochar with sulfur-based functional groups (C=S, C-S, S-S, S2-, S-H, -SO32-, -SO42-) to significantly improve cadmium (Cd) adsorption. Sulfur-doping using H2SO4, Na2S, and Na2S2O3 markedly increased the sulfur content from 0.11% (pristine) to 2.81% (H2SO4), 0.57% (Na2S), and 13.27% (Na2S2O3). Characterization techniques such as SEM-EDS, FTIR, and XPS confirmed the successful incorporation of sulfur moieties and additional oxygen-containing groups, improving surface functionality. The Cd adsorption capacity of S-modified biochar increased by 4.8-9.0 times compared to pristine biochar, with peak values of 39.38, 20.84, and 34.14 mg g-1 for H2SO4, Na2S, and Na2S2O3-modified biochar, respectively. The equilibrium time was significantly reduced from 4 h (pristine) to 5-10 min (S-modified). The enhanced Cd adsorption was attributed to the synergistic interplay of electrostatic attraction, cadmium-π electron interactions, complexation, and ion exchange mechanisms, facilitated by the presence of oxygen and sulfur functional groups. Density Functional Theory (DFT) calculations showed that sulfur doping modulated the electronic properties of the biochar-Cd systems, narrowing the band gap and enhancing the Cd-O bonds, thereby improving the Cd adsorption performance. Additionally, the binding energies of the S-modified biochar-Cd complex were found to be more stable compared to those before Cd adsorption. This study demonstrates that both oxygen and sulfur-functionalized sawdust biochar is an effective and eco-friendly adsorbent for Cd removal, highlighting the significance of tailored surface modifications to augment biochar's reactivity and affinity towards specific contaminants. The developed material offers a sustainable and scalable solution for Cd removal from aqueous environments, contributing to advanced water treatment technologies and environmental remediation strategies.
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2. 题目: Soil carbon fractions drive microbial community assembly processes during forest succession

文章编号: N24121606
期刊: Journal of Environmental Management
作者: Haiyan Sun, Fei Sun, Xiaoli Deng, Naleen Storn
更新时间: 2024-12-16
摘要: Forest succession is one of the foremost ecosystem restoration strategies, while soil microbes play essential roles in the processes by modulating carbon (C) cycling. The fraction of soil organic carbon (SOC) lead to shifts in the selective environment, which in turn contribute to changes in microbial assembly process. Here, by studying the microbial community during forest succession, the main role of SOC composition in determining soil microbial community structure and assembly process during forest succession was revealed in Changbai Mountains, China. We found that forest succession altered the structure and composition of bacterial and fungal communities and might be associated with potential changes in function. The null models indicated that forest succession enhanced the bacterial dispersal limitation process and weakened the fungal dispersal limitation processes. The labile SOC drove the microbial assembly processes by affecting microbial alpha diversity and keystone taxa, providing a new targeted therapy and an indicator of the soil microenvironment. This results highlighted the non-negligible role of labile SOC in determining microbial community assembly during long-term vegetation succession. Overall, this study could provide a perspective on the importance of the composition of SOC in shaping microbial differences and community assembly during forest succession, which cannot be overlooked in forest function studies.
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3. 题目: Middle Eocene Climatic Optimum drove palaeoenvironmental fluctuations and organic matter enrichment in lacustrine facies of the Bohai Bay Basin, China

文章编号: N24121605
期刊: Palaeogeography, Palaeoclimatology, Palaeoecology
作者: Yuqi Wu, Fujie Jiang, Yunlong Xu, Jing Guo, Tianwu Xu, Tao Hu, Weibing Shen, Xiaowei Zheng, Di Chen, Qiang Jiang, Senxiuyuan Yu
更新时间: 2024-12-16
摘要: The Middle Eocene Climatic Optimum (MECO) is a transient warming episode during an interval of long-term Cenozoic cooling that is recorded in deep-sea marine sediments and marine basins; however, the MECO is rarely reported in terrestrial contexts, complicating its comparison with marine settings. In this study, we describe well-dated core samples from the Shahejie Formation, Dongpu Depression, Bohai Bay Basin, China, using thin-section observations, isotope geochemistry, and elemental geochemistry to determine lacustrine MECO records and associated palaeoenvironmental changes. Based on previously published age models, we identified that the MECO event (40.7–40.07 Ma) in the Dongpu Depression occurs at a core depth of 2945–3046 m and we report two δ¹³Ccarb excursions and one δ¹⁸Ocarb excursion. During the MECO event, the palaeoclimate was warm and humid, characterized by reduced salinity and increased water depth, consistent with contemporaneous marine and lacustrine palaeoenvironmental changes, indicating the global importance of MECO-induced environmental fluctuations. In conjunction with palaeoenvironmental changes, we established models for organic matter (OM) enrichment at our site. OM enrichment was influenced by palaeosalinity and water depth. The warm, humid climate, increased water depth, reduced salinity, and elevated atmospheric CO2 concentrations provided favorable conditions for algal growth. Additionally, the anoxic conditions at the bottom of the lake facilitated the preservation of OM. This study provides new insights into palaeoenvironmental changes driven by climatic events and offers perspectives for predicting organic carbon sequestration in modern lakes.
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4. 题目: Fabrication of Fe-doped biochar for Pb adsorption through pyrolysis of agricultural waste with red mud

文章编号: N24121604
期刊: Chemosphere
作者: Jae-In Lee, Dongho Choi, Seungwon Kim, Seong-Jik Park, Eilhann E Kwon
更新时间: 2024-12-16
摘要: Synthesis of metal-doped biochar have gained prominence due to their adsorption capability for heavy metal(loid)s. In this study, iron-doped biochar (Fe-BC) was fabricated through pyrolysis of waste mushroom substrate (WMS) with red mud (RM). The synthesised Fe-BC was employed as an adsorbent for Pb removal. During pyrolysis of WMS, introducing RM contributed to the enhanced syngas formation, this observation was attributed to the catalytic function of Fe species in RM. The Fe–BCs were made at three different temperatures (500, 600, and 700 °C), and their adsorption capabilities for Pb were evaluated. Among the prepared Fe–BCs, Fe-BC fabricated at 700 °C (Fe-BC-700) demonstrated the highest Pb adsorption performance (243.07 mg g⁻¹). This performance primarily stemmed from the presence of zero-valent Fe and surface functional groups (–OH) in Fe-BC-700. Pb removal by Fe-BC-700 was dominated by surface precipitation and complexation mechanisms. Therefore, this study highlights a promising approach for producing an effective adsorbent for Pb removal from industrial wastewater by utilizing wastes such as RM and WMS.
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5. 题目: Efficient flocculation of multiple heavy metals by iron-based modified-carbonate biochar: Adsorption mechanism and practical application

文章编号: N24121603
期刊: Journal of Environmental Chemical Engineering
作者: Mingzhen Zhang, Guijian Liu, Ruijia Liu, Jinzhao Xu, Wen Si, Guanyu Wang
更新时间: 2024-12-16
摘要: In this paper, an iron-based carbonate-modified biochar (PT650) was prepared using tea tree branches and potassium pertechnetate. Through static and dynamic batch adsorption experiments, it was found that PT650 had excellent adsorption speed and adsorption capacity for multiple heavy metals, revealing the adsorption mechanism of PT650 for heavy metals in water. The specific surface area of the PT650 was found to be as high as 398.7 m²/g, and about 268 times higher than raw biochar. The presence of oxygen-containing functional groups, metal carbonate compounds, and metal oxides on the surface of biochar leads to cation exchange reactions and complexation reactionswith heavy metals, and metal-π electron interactions with π-bonds. The maximum adsorption amounts of Cu²⁺, Zn²⁺, Cd²⁺ and Pb²⁺ in the ternary and quaternary heavy metal solutions were obtained by fitting the Langmuir model, which showed that the maximum adsorption capacity of Cu²⁺, Zn²⁺, Cd²⁺ and Pb²⁺ in the quaternary system were 120.1, 113.5, 101.8 and 410.4 mg/g, and the equilibrium time was 5 min, respectively. The maximum adsorption amounts of Cu²⁺, Zn²⁺, Cd²⁺ and Pb²⁺ by PT650 in the dynamic adsorption were 54.90, 50.75, 39.66 and 128.3 mg/g, respectively. The extended Langmuir model and the Schindorff-Reibhun-Shentuh model showed that there was adsorption competition among the four heavy metals, and the affinity of PT650 for the four heavy metals was found to be Pb > Cu > Cd ≈ Zn. The adsorption rate of PTS650 for heavy metals in real wastewater can reach more than 99%, which is of great significance for practical applications. PT650 has potential application in mining wastewater as a cost-effective way to remediate heavy metal contaminated wastewater.
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6. 题目: Increase in mineral-associated organic carbon does not offset the decrease in particulate organic carbon under long-term nitrogen enrichment in a steppe ecosystem

文章编号: N24121602
期刊: Soil Biology and Biochemistry
作者: Li Liu, Junjie Yang, Jing Wang, Qiang Yu, Cunzheng Wei, Liangchao Jiang, Jianhui Huang, Yunhai Zhang, Yong Jiang, Haiyang Zhang, Xingguo Han
更新时间: 2024-12-16
摘要: Nitrogen (N) deposition significantly impacts ecosystem carbon (C) cycling. However, most experimental N deposition studies applied N fertilizers in low-frequency, typically once or twice per year during the growing season. Few studies have been conducted to investigate the effects of high-frequency N deposition at varying rates on the formation and stability of soil organic carbon (SOC). Additionally, the effects of N addition on the two SOC fractions — particulate organic carbon (POC) and mineral-associated organic carbon (MAOC) — and the underlying mechanisms are not well understood. To address these gaps, we conducted a long-term N addition experiment in a typical steppe ecosystem in Inner Mongolia, China, beginning in 2008. The N addition rates ranged from 0 to 50 g N m^-2 yr^-1, with a high frequency of N additions (once a month, 12 additions per year). After a decade of N addition, we observed a consistent decrease in SOC (by 3.9 ± 0.51 %) and POC (by 17.5 ± 2.31 %) and an increase in MAOC (by 5.8 ± 1.68 %) compared to the control treatment (i.e., the treatment without N addition). The decline in POC was attributed to stimulated microbial decomposition due to improved quality of particulate organic matter and increased priming effect from SOC. The increase in MAOC was associated with enhanced mineral protection, resulting from increased solubility of iron/aluminum (Fe/Al) that are reactive in directly adsorbing SOC molecules to form stable metal-SOC complexes. However, this increase in MAOC does not offset the decrease in POC, leading to an overall decrease in SOC under N enrichment. This study reveals the crucial roles of microbial decomposition and mineral protection in determining SOC fractions in N-enriched steppe ecosystems.
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7. 题目: Recent advances and factors affecting the adsorption of nano/microplastics by magnetic biochar

文章编号: N24121601
期刊: Chemosphere
作者: Khurram Shahzad, Areej Hasan, Syed Kumail Hussain Naqvi, Saima Parveen, Abrar Hussain, Kyong-Cheol Ko, Sang Hyun Park
更新时间: 2024-12-16
摘要: The increase in nano/microplastics (NPs/MPs) from various everyday products entering aquatic environments highlights the urgent need to develop mitigation strategies. Biochar (BC), known for its excellent adsorption capabilities, can effectively target various harmful organic and inorganic pollutants. However, traditional methods involving powdered BC necessitate centrifugation and filtration, which can lead to the desorption of pollutants and subsequent secondary pollution. Magnetic biochar (MBC) offers a solution that facilitates straightforward and rapid separation from water through magnetic techniques. This review provides the latest insights into the progress made in MBC applications for the adsorption of NPs/MPs. This review further discusses how external factors such as pH, ionic strength, temperature, competing ions, dissolved organic matter, aging time, and particle size impact the MBC adsorption efficiency of MPs. The use of machine learning (ML) for optimizing the design and properties of BC materials is also briefly addressed. Finally, this review addresses existing challenges and future research directions aimed at improving the large-scale application of MBC for NPs/MPs removal.
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