Bromate formation has been found in the SO4·--based oxidation processes,but previous studies primar-ily focused on the bromate formation in the homogeneous SO4·--based oxidation processes.The kinetics and mechanisms of bromate formation are poorly understood in the heterogeneous SO4·--based oxida-tion 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 ra-tio 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 SO4·-,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 forma-tion 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.

Jingxin Yang;Hongrui Ma;Chuan Wang;Hong Liu

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;Chongqing Institute of Green and Intelligent Technology,Chinese Academy of Sciences,Chongqing 400714,China

中国化学快报（英文版）

[1]Jingxin Yang;Hongrui Ma;Chuan Wang;Hong Liu-.Bromate formation during oxidation of bromide-containing water by the CuO catalyzed peroxymonosulfate process)[J].中国化学快报（英文版）,2022(11):4786-4791

Bromate,primar,bromate,eliminations

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