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为探明O3氧化Br-的反应机制,采用离子色谱、PDA紫外-可见光度仪研究了水中Br-被O3氧化的反应过程.离子色谱分析表明,被氧化的Br-中只有约10%被O3氧化成BrO3-.进一步研究表明,除了生成BrO3-外,Br-被O3氧化过程中还产生了Br2,Br2又与溶液中存在的Br-结合形成Br3-,并首次得到了Br3-的吸收光谱,测得Br3-的最大吸收峰λmax为260 nm,提出了Br-与O3的基元反应.该研究补充和完善了O3氧化Br-的反应机制,也为O3处理含Br-水时Br-的归趋提供了有益信息.
In order to find out the reaction mechanism of O3 oxidation of Br-, the reaction process of Br- oxidized by O3 in water was studied by ion chromatography and PDA UV-Vis spectrophotometer.The analysis by ion chromatography showed that only about 10% of the oxidized Br- Oxidation to BrO3-. Further studies showed that in addition to the formation of BrO3-, Br2 was also produced during the oxidation of O3 Br2, which in turn combined with Br- present in the solution to form Br3-, and for the first time the Br3- absorption spectrum , The maximum absorption peak λmax of Br3- was measured to be 260 nm, and the elementary reactions of Br- and O3 were proposed. This research complements and improves the reaction mechanism of O3 oxidation Br-, The fate provides useful information.