Gounden Asogan N, Jonnalagadda Sreekantha B
Department of Chemistry, Mangosuthu University of Technology, P.O. Box 12363, Jacobs 4026, South Africa.
School of Chemistry, Westville Campus, University of KwaZulu-Natal, P Bag X54001, Durban 4000, South Africa.
Molecules. 2019 Sep 23;24(19):3450. doi: 10.3390/molecules24193450.
The formation of carcinogenic bromate ions is a constraint when ozone is used for the remediation of water containing brominated organic materials. With its strong oxidizing ability, ozone rapidly transforms bromide in aqueous media to bromate, through a series of reactions involving hydroxyl radicals. Several strategies, such as limiting the ozone concentration, maintaining pH < 6, or the use of ammonia or hydrogen peroxide were explored to minimize bromate generation. However, most of the above strategies had a negative effect on the ozonation efficiency. The advanced oxidation processes, using catalysts together with ozone, have proven to be a promising technology for the degradation of pollutants in wastewater, but very few studies have been conducted to find ways to minimize bromate formation during this approach. The proposed article, therefore, presents a comprehensive review on recent advances in bromate reduction in water by catalytic ozonation and proposes reaction mechanisms associated with the catalytic process. The main aim is to highlight any gaps in the reported studies, thus creating a platform for future research and a quest to find environment friendly and efficacious catalysts for minimizing bromate formation in aqueous media during ozonation of brominated organic compounds.
当使用臭氧处理含溴有机材料的水时，致癌溴酸根离子的形成是一个限制因素。臭氧具有很强的氧化能力，通过一系列涉及羟基自由基的反应，能在水介质中迅速将溴化物转化为溴酸盐。人们探索了几种策略，如限制臭氧浓度、将pH维持在<6，或使用氨或过氧化氢，以尽量减少溴酸盐的生成。然而，上述大多数策略对臭氧化效率都有负面影响。使用催化剂与臭氧结合的高级氧化工艺已被证明是一种有前途的废水污染物降解技术，但很少有研究致力于寻找在这种方法中尽量减少溴酸盐形成的方法。因此，这篇拟投的文章全面综述了催化臭氧化法在水中减少溴酸盐方面的最新进展，并提出了与催化过程相关的反应机理。主要目的是突出已报道研究中的任何空白，从而为未来的研究创建一个平台，并寻求找到环境友好且有效的催化剂，以在溴化有机化合物臭氧化过程中尽量减少水介质中溴酸盐的形成。
