Abstract：The degradation of diclofenac (DCF) by Cu2+ enhanced UV activation of peracetic acid (Cu2+/UV/PAA) was investigated. The effects of pH, PAA dose, Cu2+ dose, inorganic anions (such as Cl-, SO42-, NO3- and CO32-) and dissolved organic matter (DOM) on DCF removal by Cu2+/UV/PAA were also evaluated. The degradation products and transformation mechanism of DCF by Cu2+/UV/PAA were studied. Both UV and Cu2+ could activate PAA to produce active radicals, which could promote DCF removal. The degradation of DCF by Cu2+/UV/PAA followed the pseudo first-order kinetics and its degradation was probably attributed to direct photolysis, HO· oxidation and other radicals oxidation such as CH3COO· and CH3COOO·. In the pH range of 3-11, DCF had the best degradation efficiency at pH 8.5. When PAA dose increased, the degradation efficiency of DCF was enhanced gradually, but excessive PAA could compete with DCF for HO·. The increase of Cu2+ dose could also promote DCF removal, while excessive Cu2+ could form Cu(OH)2, which might lead to the reduction of its catalytic ability. Since NO3- can generate HO· under UV irradiation, its existence promoted the degradation of DCF, and the enhancement effect increased with the increase in its concentration. The presence of Cl-, SO42-, CO32- and DOM in different concentrations had little effect on DCF removal. Thirteen degradation products were detected in the degradation of DCF by Cu2+/UV/PAA. According to these degradation products, the probable transformation mechanism of DCF was proposed exhibiting eight reaction pathways.
张李, 付永胜, 刘义青. Cu2+强化UV活化过氧乙酸降解水中的双氯芬酸[J]. 中国环境科学, 2020, 40(12): 5260-5269.
ZHANG Li, FU Yong-sheng, LIU Yi-qing. Degradation of diclofenac in water by Cu2+ enhanced UV activation of peracetic acid. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(12): 5260-5269.
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