热激活过硫酸盐降解水中氯贝酸

Degradation of Clofibric Acid in Aqueous Solution by Thermally Activated Persulfate

为了研究有效降解水体中有机污染物的方法,采用热激活过硫酸盐工艺降解典型PPCPs氯贝酸,考察氯贝酸初始浓度、过硫酸盐(PS)投加量、溶液pH、温度和腐植酸(HA)投加量多种因素对热激活PS去除氯贝酸的影响。结果表明:热激活过PS降解氯贝酸与一级反应动力学模型相符,且反应速率常数逐渐减小;当氯贝酸的初始浓度不断增加,在一定的范围内PS投加量的增加有利于氯贝酸的降解,随温度升高系统对氯贝酸的去除率及反应速率常数快速增大;腐植酸投加量的逐步增加,氯贝酸的去除率总体呈现先升高后下降的趋势,当反应液pH值不断升高,反应环境从酸性增至强碱性的过程中,热激活PS工艺对氯贝酸的降解速率表现出先减小而后增大的现象。

In order to study effective methods to degrade organic pollutants in water, thermally activated persulfate（PS） process was employed to remove clofibric acid（CA）, one of the typical pharmaceuticals and personal care products. The influence of various factors, including initial CA concentration, persuffate dosage, pH, applied temperature and humic acid, on CA degradation by thermally activated PS process was investigated. Results showed that the degradation of CA was in accordance with the first-order reaction kinetics, and reaction rate constant decreased with the increase of the initial concentration of CA. The increase of the amount of persulfate was favorable to the degradation of CA in a certain range. With the increase of temperature, removal efficiency and reaction rate constant of the system increased rapidly. With the increase of humic acid dosage, removal efficiency of CA firstly increased and then decreased. When the pH from acidic to alkaline, and then to strong alkaline, degradation rate of CA had a tendency to slow down and speed up.