Bromate formation during oxidation of bromide-containing water by the CuO catalyzed peroxymonosulfate process  

作　　者：Jingxin Yang Hongrui Ma Chuan Wang Hong Liu 

机构地区：[1]Key Laboratory for Water Quality and Conservation of the Pearl River Delta,Ministry of Education,Institute of Environmental Research at Greater Bay,Guangzhou University,Guangzhou 510006,China [2]Chongqing Institute of Green and Intelligent Technology,Chinese Academy of Sciences,Chongqing 400714,China

出　　处：《Chinese Chemical Letters》2022年第11期4786-4791,共6页中国化学快报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.42077159 and 51978181)。

摘　　要：Bromate formation has been found in the SO_(4)^(•−)-based oxidation processes,but previous studies primarily focused on the bromate formation in the homogeneous SO_(4)^(•−)-based oxidation processes.The kinetics and mechanisms of bromate formation are poorly understood in the heterogeneous SO_(4)^(•−)-based oxidation processes,although which have been widely studied in the eliminations of micropollutants.In this work,we found that the presence of CuO,a common heterogeneous catalyst of peroxymonosulfate(PMS),appreciably enhanced the bromate formation from the oxidation of bromide by PMS.The conversion ratio of bromide to bromate achieved over 85%within 10 min in this process.CuO was demonstrated to play a multiple role in the bromate formation:(1)catalyzed PMS to generate SO_(4)^(•−),which then oxidizes bromide to bromate;(2)catalyzed the formed free bromine to disproportionate to bromate;(3)catalyzed the formed free bromine to decomposed back into bromide.In the CuO-PMS-Br system,bromate formation increases with increasing CuO dosages,initial CuO and bromide concentrations,but decreases with increasing bicarbonate concentrations.The presence of NOM(natural organic matter)resulted in a lower formed bromate accompanied with organic bromine formation.Notably,CuO catalyzes PMS to transform more than 70%of initial bromide to bromate even after recycled used for six times.The formation of bromate in the PMS catalysis by CuO system was also confirmed in real water.

关 键 词：BROMATE Peroxymonosulfate(PMS) CUO SO_(4)^(•−) BROMIDE Heterogeneous catalyst 

分 类 号：TU991.25[建筑科学—市政工程] O643.36[理学—物理化学]