Degradation of benzophenone-4 in a UV/chlorine disinfection process: Mechanism and toxicity evaluation
Degradation of benzophenone-4 in a UV/chlorine disinfection process: Mechanism and toxicity evaluation
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紫外线/氯消毒过程中二苯甲酮 4 的降解：机制和毒性评估
DOI：
10.1016/j.chemosphere.2019.01.186
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发表时间：
2019
期刊：
影响因子：
8.8
通讯作者：
Li Aimin
中科院分区：
文献类型：
--
作者：
Jia Xiaorui;Jin Jing;Gao Rui;Feng Tianyu;Huang Yan;Zhou Qing;Li Aimin
研究了二苯甲酮-4（BP-4）在紫外/氯消毒过程中的降解情况，并与氯化消毒和紫外消毒进行了比较。UV/Cl_2工艺对BP-4的降解效果显著，10 s后降解率可达80%。然而，在UV/氯工艺（[游离活性氯（FAC）]0：[BP-4]0= 1：1，pH = 7）中观察到初始浓度的36%的反弹。在添加碱度、Cl-和腐殖酸（HA）的情况下，也出现了同样的趋势。本工作从机理的角度解释了这种有趣的动力学趋势。事实上，氯化产物P1和BP-4之间的转化在一定条件下是可逆的。P1中C单键Cl键电荷分布的不均匀性导致了P1的光解脱氯。这种转化导致BP-4浓度增加。此外，在实验条件下，紫外光功率的增加促进了P1的光分解。此外，本文还研究了BP-4溶液经氯化和UV/氯处理后，可吸收有机卤素（AOX）的变化以及发光菌的急性毒性、内分泌干扰效应和细胞毒性等3种毒性变化。紫外线/氯工艺在水处理中表现出比氯化低的生态毒性。
This study investigated the degradation of benzophenone-4 (BP-4) in a UV/chlorine disinfection process, with chlorination and UV disinfection as comparisons. With a degradation efficiency of 80% after 10 s, the UV/chlorine process significantly enhanced the degradation of BP-4. However, a rebound of 36% of the initial concentration was observed in the UV/chlorine process ([free active chlorine (FAC)]0:[BP-4]0= 1:1, pH = 7). The same tendency appeared under the addition of alkalinity, Cl−, and humic acid (HA). This work interpreted this interesting kinetic tendency from the perspective of mechanism. In fact, the transformation between the chlorinated product P1 and BP-4 was reversible under certain conditions. The inhomogeneous charge distribution of the Csingle bondCl bond in P1 led to the photolytic dechlorination of P1. This transformation caused an increase in BP-4 concentration. In addition, the increase in the UV light power promoted the photodecomposition of P1 under the experimental condition. In addition, this study evaluated the change in absorbable organic halogens (AOX) and three kinds of toxicity changes in the BP-4 solution after chlorination and the UV/chlorine process, including the acute toxicity of luminescent bacteria, endocrine disrupting effect and cytotoxicity. The UV/chlorine process exhibited lower ecotoxicity than chlorination in water treatment.