过氧乙酸
化学
腐植酸
降级(电信)
激进的
活性炭
单线态氧
高级氧化法
催化作用
污染物
水处理
核化学
光化学
吸附
过氧化氢
有机化学
氧气
废物管理
电信
肥料
计算机科学
工程类
作者
Zongping Wang,Zhenbin Chen,Qingbao Li,Wei Wang,Lisan Cao,Yujie Cheng,Shiwen Yu,Zizheng Liu,Yiqun Chen,Siyang Yue,Jun Ma,Pengchao Xie
标识
DOI:10.1021/acs.est.3c03370
摘要
Environmental-friendly and low-cost catalysts for peracetic acid (PAA) activation are vital to promote their application for micropollutant degradation in water. In this study, powdered activated carbon (PAC) was reported to improve the degradation of sulfamethoxazole (SMX). The improvement of SMX degradation in the PAC/PAA system was expected to be because of the PAA activation rather than the co-existing H2O2 activation. Non-radical oxidation pathways, including the mediated electron-transfer process and singlet oxygen (1O2), were evidenced to play the dominant roles in the degradation of micro-organic pollutants. The graphitization of PAC, persistent free radicals, and electron-donating groups like C–OH were proposed to contribute to the activation of PAA. High SMX degradation could be achieved in the acidic and neutral conditions in the PAC/PAA system. Overall, higher dosages of PAC (0–0.02 g/L) and PAA (0–100 μM) benefited the degradation of SMX. The presence of HCO3– could lower the SMX degradation significantly, while Cl–, PO43–, and humic acid (HA) only reduced the SMX degradation efficiency a little. Overall, this study offered an efficient non-radical PAA activation method using PAC, which can be effectively used to degrade micro-organic pollutants.
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