Abstract：A novel heterogeneous advanced oxidation system (Fe2+ modified zeolite/PAA) capable of generating several radicals was developed to remove diclofenac (DCF) from the contaminated water. The influences of various operational parameters including the initial pH, dosages of Fe2+ modified zeolite (FMZ) and PAA, as well as the water matrix on the removal of DCF were investigated. Meanwhile, the main reactive species in this system were elucidated by radical scavenging experiments. Results indicated that the DCF degradation by FMZ/PAA could be described by first-order kinetic model. DCF was completely removed in 40min under the conditions of pH 7.0, FMZ dosage of 0.2g/L, PAA dosage of 80μmol/L, initial DCF concentration of 1μmol/L and temperature of 25oC. The presence of Cl-, CO32- and NOM had negative effects on DCF degradation through radical competition, whereas Cu2+ could promote obviously the DCF degradation by accelerating the activation of PAA to generate more radicals. Carbon-centered radical was proved to be mainly responsible for DCF oxidation. According to three identified products, the degradation pathway of DCF by FMZ/PAA was proposed including C-N bond cleavage, decarboxylation and formylation.
史鸿乐, 汪诗翔, 刘义青, 付永胜. 亚铁改性沸石活化过氧乙酸降解水中双氯芬酸的研究[J]. 中国环境科学, 2020, 40(5): 2116-2123.
SHI Hong-Le, WANG Shi-Xiang, LIU Yi-Qing, FU Yong-Sheng. Enhanced degradation of diclofenac by catalytic peracetic acid using Fe2+ modified zeolite. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(5): 2116-2123.
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