Institute of Urban Studies, School of Environmental and Geographical Sciences, Shanghai Normal University, 100 Guilin Rd., Shanghai, 200234, PR China.
Institute of Urban Studies, School of Environmental and Geographical Sciences, Shanghai Normal University, 100 Guilin Rd., Shanghai, 200234, PR China; Yangtze River Delta Urban Wetland Ecosystem National Field Scientific Observation and Research Station, Shanghai, 200234, PR China.
Environ Pollut. 2022 Nov 15;313:120170. doi: 10.1016/j.envpol.2022.120170. Epub 2022 Sep 14.
Peracetic acid (PAA) as an emerging oxidative has been concerned increasingly due to its high oxidation capacity and low byproducts formation potential. This study was to investigate the oxidation of sulfamethazine (SMZ) by PAA activated with activated biochar (ABC) after thermal modification. The results demonstrated that PAA could be effectively activated by ABC to degrade SMZ in a wide pH range (3-9), which followed the pseudo-second-order kinetics (R > 0.99). Both non-radicals (singlet oxygen) and free radicals (alkoxy radicals, hydroxyl radicals) existed in the ABC/PAA system, and the degradation of SMZ was dominated by singlet oxygen. Humic acid (HA), SO and HCO slightly inhibited the degradation of SMZ in the ABC/PAA process, while Cl and Br promoted the degradation of SMZ. The cleavage of S-N, S-C bond, and SO extraction reaction rearrangement was the main oxidation process of SMZ. Meanwhile, the results of the ECOSAR program showed that the acute toxicity of most by-products was significantly reduced compared to SMZ, which revealed the potential applicability of the ABC/PAA process in the treatment of antibiotics pollution and their detoxification.
过氧乙酸（PAA）作为一种新兴的氧化剂，因其具有较高的氧化能力和较低的副产物生成潜力而受到越来越多的关注。本研究旨在探讨经过热改性后的活性生物炭（ABC）活化过氧乙酸（PAA）氧化磺胺甲恶唑（SMZ）的情况。结果表明，PAA 可以被 ABC 有效活化，在较宽的 pH 值范围（3-9）内降解 SMZ，遵循拟二级动力学（R>0.99）。ABC/PAA 体系中存在非自由基（单线态氧）和自由基（烷氧基自由基、羟基自由基），SMZ 的降解主要由单线态氧控制。腐殖酸（HA）、SO 和 HCO 对 ABC/PAA 过程中 SMZ 的降解略有抑制，而 Cl 和 Br 则促进了 SMZ 的降解。S-N、S-C 键的断裂和 SO 萃取反应的重排是 SMZ 的主要氧化过程。同时，ECOSAR 程序的结果表明，与 SMZ 相比，大多数副产物的急性毒性显著降低，这表明 ABC/PAA 工艺在处理抗生素污染及其解毒方面具有潜在的适用性。
