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Alternative TitleThe transformation and the toxicity evaluation of 2,4- dihydroxybenzophone during the photo-induction- chlorination disinfection process
Thesis Advisor杜宇国
Degree Grantor中国科学院生态环境研究中心
Place of Conferral北京
Degree Name理学硕士
Degree Discipline环境科学
Other Abstract

      ,4-Dihydroxybenzophenone􀋄BP-1􀋅 is an important UV filter, which is widely used in personal care products and industrial products. It has been detected in environmental water, human serum and human urine samples and so on. BP-1 is hardly removed during water treatment. Chlorination is the most common disinfection method􀋈but it would cause the production of disinfection products (DBPs). UV disinfection is widely used now, because it would not induce new chemical substances.  Vchlorination disinfection is a better diainfection treatment, which can continue to disinfect and produce less DBPs. This study has explored the transformation process of BP-1 and the change of the acute toxicity during UV disinfection process and UVchlorine disinfection, Obtaining the following conclusions􀋖
      (1) This study explored the transfer mechanism of BP-1 and the change of acute toxicity during UV-chlorine disinfection process (UV post chlorination and UV accompanied by chlorination). It was found that UV could promote the transformation of BP-1. The transformation rate was faster than the chlorination of BP-1. Besides, UV could also promote Baeyer-Villiger-Type oxidation and C-C coupling reaction. When 2-chlorobenzophenone was subjected to UV􀋈it was detected Baeyer-Villiger-Type oxidation products and C-C coupling products. The acute toxicity of the reaction mixture has an obvious increase over time during the UV-chlorine combined treatment. The toxicity change trend was similar to the concentration change of P10 which indicated that P10 may be the toxic product. It was also detected halobenzoquinones and phenyl benzoquinones, which can cause DNA damage and exert strong genotoxicity.
      (2) This study explored the transfer mechanism of BP-1 and the change of acute toxicity during UV disinfection process. It was found 17 transformation products in total. Although, it was detected 􀁧OH in the mixture, but the add of nitrate and isopropyl alcohol had no influence to the photolysis of BP-1. It indicated that the photolysis of
BP-1 might be direct photolysis. The orthogonal experiment indicates that the pH, the initial concentration of BP-1 and the UV intensity would influence the rate and the extent of the transformation process. The acute toxicity of the reaction mixture has anobvious increase over time under all conditions. BP-1 can also undergo photodecomposition in the secondary effluent from WWTP, and the species of transformation products was same with that in milli-Q water, but the production was lower than that in milli-Q water.

Document Type学位论文
Recommended Citation
GB/T 7714
孙雪凤. 2,4-二羟基二苯甲酮在光-氯消毒处理中的转化机制及毒性评价研究[D]. 北京. 中国科学院生态环境研究中心,2019.
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孙雪凤-2,4-二羟基二苯甲酮在光-氯消(2769KB)学位论文 开放获取CC BY-NC-SAApplication Full Text
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