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    顾雍, 孙贤波, 刘勇弟. 紫外光光降解水中的四溴双酚A[J]. 华东理工大学学报(自然科学版), 2018, 44(6): 849-854. DOI: 10.14135/j.cnki.1006-3080.20180103001
    引用本文: 顾雍, 孙贤波, 刘勇弟. 紫外光光降解水中的四溴双酚A[J]. 华东理工大学学报(自然科学版), 2018, 44(6): 849-854. DOI: 10.14135/j.cnki.1006-3080.20180103001
    GU Yong, SUN Xian-bo, LIU Yong-di. Photo-Degradation of Tetrabromobisphenol A by UV Light in Aqueous Solution[J]. Journal of East China University of Science and Technology, 2018, 44(6): 849-854. DOI: 10.14135/j.cnki.1006-3080.20180103001
    Citation: GU Yong, SUN Xian-bo, LIU Yong-di. Photo-Degradation of Tetrabromobisphenol A by UV Light in Aqueous Solution[J]. Journal of East China University of Science and Technology, 2018, 44(6): 849-854. DOI: 10.14135/j.cnki.1006-3080.20180103001

    紫外光光降解水中的四溴双酚A

    Photo-Degradation of Tetrabromobisphenol A by UV Light in Aqueous Solution

    • 摘要: 以四溴双酚A为模式污染物,考察了pH、四溴双酚A初始浓度、温度、结构类似物等因素对四溴双酚A光解过程的影响,并且考察了光解过程中四溴双酚A的急性毒性变化,同时构建了四溴双酚A的光解途径。结果表明,四溴双酚A的光解过程符合一级动力学过程,碱性条件下的光解速率常数受到量子产率(Φ)的控制。相同反应条件下,光解速率常数随四溴双酚A初始浓度和苯酚浓度增大而减小,但随温度升高而增大。由于四溴双酚A的光解中间产物存在毒性,因此直接光解作用对四溴双酚A的毒性减弱效果较差。气相色谱-质谱联用仪(GC-MS)分析表明,四溴双酚A的光解过程主要包括四溴双酚A经过紫外光作用下发生β键断裂(异丙基和苯环间的化学键)和C—Br键的断裂。

       

      Abstract: Tetrabromobisphenol A (TBBPA) is widely used as a brominated flame retardant in construction materials and electronic products. Due to a large amount of applications, TBBPA was detected in wastewater treatment plants and various environmental medias such as air, soil and river sediments. It is harmful to the environment and causes serious issues to human healthy because of its toxicity. However, the removal of TBBPA by photolysis as well as its degradation mechanism is rarely reported. In this paper, the influence of pH, initial concentration of TBBPA, temperature and structural analogues on photolysis of TBBPA was studied. Acute toxicity change during photolysis was investigated as well. Finally, the degradation pathway of TBBPA under UV was proposed through the determination of photolysis intermediates by GC-MS. The photolysis of TBBPA follows first-order kinetic process and the rate constant of photolysis reaction under basic condition is controlled by the quantum yield (Φ). Under the same reaction conditions, the rate constant of photolysis reaction decreases with the increasing of initial TBBPA concentration and phenol concentration, while it increases with temperature. The direct photolysis can't reduce acute toxicity effectively because of the toxicity of intemediates after photolysis. GC-MS results show that the cleavage of β-bond (bond between isopropyl and benzene ring) and C-Br bond of tetrabromobisphenol A is involved during the photolysis under ultraviolet light. The main intermediates include 2,6-dibromophenol and 2,4-dibromo-4-isopropyl-phenol.

       

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