Phototransformation of 2,4,6-tribromophenol in aqueous solution: Kinetics and photolysis products
Phototransformation of 2,4,6-tribromophenol in aqueous solution: Kinetics and photolysis products
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DOI：
10.1080/10934529.2016.1229926
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发表时间：
2017-01
期刊：
影响因子：
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通讯作者：
Hongchun Zhao;Jingqiu Jiang;Yan Wang;Qing Xie;Baocheng Qu
中科院分区：
文献类型：
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作者：
Hongchun Zhao;Jingqiu Jiang;Yan Wang;Qing Xie;Baocheng Qu
摘要研究了2，4，6-三溴苯酚(TBP)在水溶液中的紫外光转化。考察了典型环境因素(即pH值、总苯二酚、亚硝酸根和亚硝酸根的初始浓度)对−的影响。结果表明，该转化过程符合准一级反应动力学。TBP的转化速率常数随初始浓度的增加而减小，随Fe~(3+)、NO_2、−浓度的增加和pH的增加而增加。经高效液相-液质联用和GC/MS分析，初步鉴定了TBP辐照后的10个光产物。其中，两种二羟基二溴苯化合物(di-OH-DBB)在反应时间上占主导地位，表明TBP的加氢脱溴可能是主要的光转化机理。此外，对8种羟基多溴二苯醚和二羟基多溴联苯的鉴定表明，光二聚反应也可能是TBP光化学反应的一种反应途径。
ABSTRACT In this research, we studied the phototransformation of 2,4,6-tribromophenol (TBP) by UV irradiation in aqueous solution. Effects of typical environmental factors (i.e., pH and the initial concentration of TBP, Fe3+ and NO2−) were also investigated. Results showed that the transformation process followed pseudo-first-order kinetics. The transformation rate constant of TBP decreased with increasing initial concentration and increased with increasing Fe3+ and NO2− concentrations as well as increasing pH. Ten photoproducts were tentatively identified after irradiation of TBP, according to HPLC-LTQ-Orbitrap MS and GC/MS analysis. Among them, two dihydroxylated dibromobenzene compounds (di-OH-DBB) were found to be predominant over the reaction time, indicating that hydrodebromination of TBP could be the main phototransformation mechanism. In addition, the identification of eight OH-PBDEs and di-OH-PBBs suggested that photodimerization might also be a reaction pathway for TBP photochemical reactions.