水溶液中臭氧和溴离子的反应研究

Investigation of the Oxidation Reaction of O_3 with Bromide Ion in Aqueous Solution

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.

The reaction mechanism of O3 with bromide ion in aqueous solution was studied by ion chromatography and UV-Vis spectrometry instruments.Ion chromatography analysis showed that only 10% of Br-which was oxidized by ozone was formed into bromate ion.The results demonstrated that the final products of the oxidation reaction were identified as Br2 and Br-3 except for BrO-3.The formation of Br-3 which was yielded from the reaction of Br2 with Br-was the major process in the reaction of Br-attacked by O3.The characteristic absorption spectrum of Br-3 with an absorption peak at 260 nm was also investigated.The results may provide helpful information about the mechanism of the oxidation reaction of Br-with O3 and fate of Br-or its derivatives in the environment by the oxidation processes.