电解含溴饮用水过程中溴酸盐的形成

Formation of Bromate in the Electrochemical Oxidation of Drinking Water Containing Bromide

分别采用BDD电极和钌铱钛电极作为阳极,钛板作为阴极,进行了模拟含溴饮用水的电化学氧化研究。通过对溴离子、活性溴、溴酸盐的浓度监测以及循环伏安扫描、RNO褪色实验等手段,对两种电极电解时溴酸盐的形成机理进行了探讨,并对电流密度、pH值和溴离子初始浓度c0(Br-)等反应条件对溴酸盐形成的影响规律进行了分析。结果表明,与钌铱钛电极相比,BDD电极电解时更易形成溴酸盐,其拥有的更强的·OH等活性物质生成能力是出现这种现象的主要原因。电流密度越大或溴离子初始浓度越高,都会使溴酸盐更易形成;中性pH条件下,溴酸盐的形成浓度要高于强酸强碱条件下。

The electrochemical oxidation research on drinking water containing bromide is conducted by using the anode of Ti/RuO2-IrO2-TiO2 and the cathode of titanium.The formation mechanism of bromate when this two electrode occur electrolysis is studied by monitoring the concentration of bromide ions,active bromine,bromate;Cyclic voltammetry scanning and RNO faded experiment.The influence law of the bromate formation is analyzed by the reaction conditions of current density,p H value and bromide ion initial concentration c0（Br^-）.The results show that the bromate is more easily formed when the BDD electrode has electrolysis compared with Ti/RuO2-IrO2-TiO2 electrode.The reason of the above phenomenon is that the BDD electrode has stronger generative capacity of active substances such as-OH.The bromate is more easily formed with the greater current density or the higher bromide ion initial concentration.At the neutral p H condition,the bromate is more easily formed compared with strong acid or alkali condition.