紫外活化过硫酸盐工艺降解二苯甲酮-3效果研究

Degradation of Benzophenone-3 by UV-activated Persulfate Process

采用紫外(UV)活化过硫酸盐(PS)高级氧化工艺降解水中典型二苯甲酮类有机防晒剂(BP-3),考察和评估各因素对BP-3去除率的影响。结果表明,UV/PS工艺对BP-3有良好的去除效果,BP-3去除率随着BP-3初始浓度的增加而减小,随着PS投加量的增加而增大。酸性条件下UV/PS工艺对BP-3的去除效果明显优于碱性条件,反应体系中Cl-、NO3-、HCO3-、SO24-等无机离子均能够抑制BP-3的降解,其中HCO3-的抑制效果最明显。基于HPLC-MS/MS高分辨质谱解析出7种中间产物,并提出可能的降解路径。生物毒性实验表明,在UV/PS工艺降解BP-3过程中,其毒性并未完全去除,对生态环境构成潜在威胁。

Typical organic sunscreen benzophenone-3(BP-3)in water was degraded by UVactivated persulfate advanced oxidation process,and effects of various factors on removal of BP-3 were investigated and evaluated.The results showed that UV/PS could effectively remove BP-3.The removal efficiency of BP-3 decreased with the increase of BP-3 initial concentration,while it increased with the increase of PS dosage.BP-3 removal efficiency was higher in acidic condition than that in alkaline condition.The presence of Cl-,NO3-,HCO3-and SO24-in aqueous solution had inhibitory effects on BP-3 degradation.Among them,the inhibitory effect of HCO3-was the most obvious.Seven intermediates were identified by HPLC-MS/MS,and the degradation pathway was proposed.Biological toxicity experiment showed that the BP-3 toxicity was not completely removed during degradation of BP-3 by UV/PS process,which indicated that it still had a potential threat to the ecological environment.