UV/PDS降解二苯甲酮-9的动力学及影响因素分析

Degradation of Benzophenone-9 by UV/PDS Process: Kinetics and Factors

为解决传统水处理工艺难以有效去除水中二苯甲酮类有机污染物的问题,采用紫外活化过硫酸盐(UV/PDS)工艺降解水中二苯甲酮-9。比较了单一UV、单一PDS及UV/PDS联用工艺对二苯甲酮-9的去除效果,并考察了初始浓度、PDS投加量、p H值、阴离子4种因素的影响。结果表明,与单一UV及单一PDS工艺相比,UV/PDS联用工艺大大提高了二苯甲酮-9的去除效果;在一定范围内,二苯甲酮-9去除率随着其初始浓度的增加而减小,且随着PDS投加量的增加而增大;酸性和碱性条件能促进二苯甲酮-9的降解,而硫酸根、碳酸氢根等阴离子均能抑制降解反应的进行,且碳酸氢根离子的抑制作用最明显。

To overcome the low benzophenones removal efficiency by traditional technologies, a study on the degradation of benzophenone-9 in water using UV-activated persulfates （UV/PDS） was carried out. The removal of benzophenone-9 by UV, PDS and UV/PDS process was compared. The effects of four factors （ initial benzophenone-9 concentration, persulfate dosage, pH and anions） on the degrada- tion rate of benzophenone-9 were investigated as well. The results showed removal efficiency in all three processes; especially, the benzophenone-9 removal efficiency could be significantly improved through the combination of the UV process and the PDS process. Meanwhile, the degradation rate of benzophenone-9 decreased with the increase of initial benzophenone-9 concentration and increased with the increase of PDS dosage. The degradation rate was improved under weak acid or alkaline conditions. Anions such as sulfate and bicarbonate could inhibit the degradation of benzophenone-9; mostly, bicarbonate had the greatest inhibition effect on the degradation process.