紫外激活过硫酸盐降解水中氯霉素的研究

Study on UV-activated Persulfate Oxidation of Chloramphenicol in Water

针对传统水处理工艺难以有效去除水中抗生素的问题，采用高级氧化技术紫外激活过硫酸盐（UV／PS）去除水中典型抗生素氯霉素（CAP）。对比了UV／PS联用工艺与单独UV和PS工艺对CAP的降解效果，分别考察了CAP浓度、PS投加量、pH值和氯离子对CAP降解效果的影响。结果表明：UV／PS会产生硫酸根自由基（SO4·^-）降解水中CAP；CAP降解过程符合准一级动力学模型；较低的CAP浓度和较高的PS浓度可以提高CAP降解速率；酸性条件下，UV／PS降解CAP速率较快；氯离子在低浓度（0～5mmol／L）下促进UV／PS氧化降解CAP，高浓度（〉10mmoL／L）时产生抑制。

As traditional technologies were ineffective in removal of antibiotics, one of the advanced oxidation processes （AOPs）, UV-activated persulfate （UV/PS） was studied for degradation of chloramphenicol （CAP） in water. The efficiencies of UV/PS, direct UV irradiation and PS oxidation alone were compared. The effects of initial CAP concentration, PS dosage, pH value and chloride on degradation of CAP were studied. The results revealed that the UV light could activate PS to generate SO4^· - to decompose CAP in water. The CAP degradation process was in line with the pseudo-first-order kinetic model. Lower initial CAP concentration and higher PS dosage could enhance the reaction. The degradation of CAP by UV/PS was faster under acid conditions. The CAP degradation rate was enhanced at a low concentration of Cl^- （0 to 5 mmol/L） but inhibited at a high level of Cl^- （ 〉 10 mmol/L）.