Citation: Jingxin Yang, Hongrui Ma, Chuan Wang, Hong Liu. Bromate formation during oxidation of bromide-containing water by the CuO catalyzed peroxymonosulfate process[J]. Chinese Chemical Letters, ;2022, 33(11): 4786-4791. doi: 10.1016/j.cclet.2022.01.008 shu

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

Jingxin Yang ^a ,
Hongrui Ma ^a ,
Chuan Wang ^{a, *,} ,
Hong Liu ^b

a.
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
b.
Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China

wangchuan@gzhu.edu.cn

Received Date: 25 October 2021
Revised Date: 1 December 2021
Accepted Date: 6 January 2022
Available Online: 13 January 2022

Figures(4)

Bromate formation has been found in the SO₄^•−-based oxidation processes, but previous studies primarily 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 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 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 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.
- Bromate,
- Peroxymonosulfate (PMS),
- CuO,
- SO₄^•−,
- Bromide,
- Heterogeneous catalyst
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