双酚A在河口水中的光解动力学

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Abstract

To study the photodegradation kinetics of bisphenol A (BPA) and the photolysis effect of the main water components in estuarine water, the real water sample was collected in the estuarine waters connecting the Maowei Sea and the Dalan River in Qinzhou city, China. The photodegradation kinetics of BPA in estuarine water sample and the effects of Cl^-, Br^-, dissolved organic matter (DOM), NO₃^-, HCO₃^-, and ionic strength on the photolysis of BPA were studied by simulated sunlight experiment. The results showed that the photolysis rate constant (k) value of BPA in estuarine water was higher than that in pure water, and the k value of BPA in the upstream water sample was 2.5 times as compared to the downstream water sample. Steady-state photolysis experiments showed that DOM and its interaction with halogen ions significantly affect the photolysis of BPA. Although NO₃^- also affected the photodegradation kinetics of BPA, the effect of NO₃^- was not obvious when it was concomitant with DOM. Radical quenching and competitive reaction kinetics experiments found that the triplet-excited state DOM (³DOM*) and halogen radicals (HRS) are the main reactive species that dominate the photodegradation of BPA in estuarine water samples. Moreover, the reactivity of ³DOM* with BPA (second-order reaction rate constant, k_3DOM*,BPA=4.42×10⁸L/(mol·s) was higher than that of HRS with BPA (k_BPA,Cl·=2.11×10⁸L/(mol·s),k_BPA,Cl2·-=8.5×10⁶L/(mol·s). The relatively high concentrations of halide ions (292mmol/L) in downstream water samples can easily quench ³DOM* to generate HRS with relatively low reactivity towards BPA,which can explain the phenomenon that the photolysis rate constant of BPA in the downstream water sample was lower than that of the upstream water sample.

Key words： bisphenol A estuarine water photodegradation kinetics triplet-excited state dissolved organic matter halogen radicals second-order reaction rate constant

Received: 19 September 2019

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X522

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	Articles by authors
	FANG Qi
	XU Zi-hao
	LIU Ning-yu
	ZHAO Qun
	TIAN Sen-lin
	LI Ying-jie

Cite this article:

FANG Qi,XU Zi-hao,LIU Ning-yu等. Photodegradation kinetics of bisphenol A in estuarine water[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(4): 1659-1666.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I4/1659

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