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Synchronously degradation benzotriazole and elimination bromate by perovskite oxides catalytic ozonation: Performance and reaction mechanism
Separation and Purification Technology ( IF 8.1 ) Pub Date : 2018-01-08 , DOI: 10.1016/j.seppur.2018.01.019
Yuting Zhang , Yijing Xia , Qingwei Li , Fei Qi , Bingbing Xu , Zhonglin Chen

Ozonation showed a good capacity on micro-emerging pollutants degradation from water or wastewater treatment, but its leading to the formation of toxic bromate. Bromate inhibition in catalytic ozonation treatment remained an important challenge. In this study, a novel catalytic ozonation was promoted using perovskite oxide as catalyst, showing good performance on synchronously degradation benzotriazole (BZA) and elimination bromate. LaCoO3 exhibited significant catalytic activity for BZA degradation, with complete degradation achieved at 15 min, and about 71% BrO3 inhibition, compared with single ozonation. LaFeO3 showed no catalytic activity for BZA degradation but inhibited the generation of BrO3 by 73%. Further investigation involving reactive oxygen species, important intermediates, the structure and surface chemical properties of the catalysts showed that H2O2 act an important effect but various in different ozonation systems. The combination of the surface hydroxyl groups on LaFeO3 with H2O2 to form [Fe-H2O2]s was found to occur in LaFeO3 catalytic ozonation, resulting the reduction of BrO3. The production of ROS in LaCoO3 catalytic system and the cyclic of Co3+/Co2+ accelerated the BZA degradation efficiency and inhibition of BrO3. A novel BrO3 elimination pathway was proposed, as an important contribution for the application of catalytic ozonation.



中文翻译:

钙钛矿氧化物催化臭氧化同时降解苯并三唑和消除溴酸盐的性能和反应机理

臭氧化处理对水或废水处理过程中产生的微小污染物的降解具有良好的能力,但会导致有毒溴酸盐的形成。在催化臭氧化处理中溴酸盐的抑制仍然是一个重要的挑战。在这项研究中,使用钙钛矿氧化物作为催化剂促进了一种新型的催化臭氧化反应,在同步降解苯并三唑(BZA)和消除溴酸盐方面表现出良好的性能。LaCoO 3表现出显著催化活性BZA降解,具有完全降解在15分钟实现的,并且约71%的BrO 3 -抑制,单臭氧化进行比较。载LaFeO 3显示了BZA退化没有催化活性,但抑制了人权法的代3 -减少了73%对活性氧,重要中间体,催化剂的结构和表面化学性质的进一步研究表明,H 2 O 2发挥着重要作用,但在不同的臭氧化体系中表现出不同。上载LaFeO表面羟基基团的组合3用H 2 ö 2形成的[Fe-H 2 ö 2 ]小号被发现在载LaFeO发生3催化臭氧,造成的BrO的还原3 - 。LaCoO 3催化体系中ROS的产生及Co 3+ / Co 2+的环化加速了降解BZA效率和的BrO的抑制3 - 。一种新型的BrO 3 -消除途径提出,作为催化臭氧化应用做出了重要贡献。

更新日期:2018-01-08
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