第一作者:Wu Xia, Biao Song
通讯作者:曾光明 教授, 周成赟 助理教授
通讯单位:湖南大学环境科学与工程学院
DOI:10.1016/j.jclepro.2022.133750
生物炭被认为是一种有前途的环境友好型催化剂,可活化过二硫酸盐(PDS)降解污染物。本研究基于K2CO3浸渍的螺旋藻生物质制备了一系列富氮生物炭(NPSBs)。热解温度和K2CO3对形貌的合理设计对NPSBs活化PDS的性能有显著影响。NPSB-700具有高比表面积、高缺陷度和良好的导电性,能够在40分钟内降解97.59%的磺胺甲恶唑(SMX)。研究发现了加速的电子转移和1O2的产生是SMX降解的主要途径,并证实了在反应过程中毒性的降低。此外,NPSB-700对各种污染物也表现出优异的降解性能。本研究为螺旋藻基催化剂的改性提供了一种简便的策略,并加深了对过硫酸盐非自由基途径氧化的理解。
Fig. 1. SEM images of (a) BC, (b) NPSB-500, (c) NPSB-600 and (d) NPSB-700. (e) TEM images and (f) HRTEM images of NPSB-700.
Fig. 2. (a) X-ray diffraction patterns, (b) Raman spectra, (c) FT-IR spectra of BC and NPSBs, and the corresponding XPS configurations of (d) C, (e) N, and (f) O.
Fig. 3. The SMX removal on (a) various catalysts, (b) effects of catalyst dosage, (c) PDS dosage, and their kobs (d)–(f) of SMX degradation, respectively.
Fig. 4. Effect of (a) solution pH and (b) coexisting anions on SMX degradation in 80 min.
Fig. 5. (a) The effects of TBA, MeOH, TEMPOL and TRP on SMX degradation in the NPSB-700/PDS system in 80 min
Fig. 7. Proposed pathway for SMX removal in NPSB-700/PDS system.
Fig. 8. (a) Mutagenicity, (b) development toxicity, (c) bioaccumulation factor and (d) T. pyriformis IGC50 (48 h) of SMX and degradation intermediates.
Fig. 9. The degradation performance of NPSB-700/PDS system (a) on different contaminants and (b) in different actual water samples.
Xia, W.; Song, B.; Yi, H.; Almatrafi, E.; Yang, Y.; Fu, Y.; Huo, X.; Qin, F.; Xiang, L.; Zeng, Y.; Zeng, G.; Zhou, C. From Aquatic Biota to Autogenous N-Doping Biochar—Using a Highly Efficient Nonradical Dominant Process for Sulfamethoxazole Degradation. Journal of Cleaner Production 2022, 373, 133750.
https://doi.org/10.1016/j.jclepro.2022.133750.
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