Degradation of bisphenol A by peroxymonosulfate activated with oxygen vacancy modified nano-NiO-ZnO composite oxides: A typical surface-bound radical system
Degradation of bisphenol A by peroxymonosulfate activated with oxygen vacancy modified nano-NiO-ZnO composite oxides: A typical surface-bound radical system
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DOI：
10.1016/j.cej.2020.125915
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发表时间：
2020-06
影响因子：
15.1
通讯作者：
Junjie You;Weiyi Sun;Shi-jun Su;Z. Ao;Chao Liu;Gang Yao;B. Lai
中科院分区：
文献类型：
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作者：
Junjie You;Weiyi Sun;Shi-jun Su;Z. Ao;Chao Liu;Gang Yao;B. Lai
采用均相沉淀法制备了NiO和ZnO复合氧化物催化剂，并将其用于活化过一硫酸盐（PMS）去除水中双酚A（BPA）。在最佳工艺条件下，BPA去除率为95.26%，总有机碳（TOC）去除率为67.11%。对催化剂的表征和理论计算（DFT）证明了氧空位修饰的异质结催化剂中发生了电子重排。结果表明，在催化剂表面形成了酸性中心（NiO）和碱性中心（氧空位），从而促进了PMS的吸附和活化。根据猝灭实验，提出了一个典型的表面结合自由基反应体系。反应体系中的活性氧主要为表面键合的SO 4·−、表面键合的·OH和1 O2。最后，对双酚A的降解途径和PMS的活化机理进行了详细的分析。
In this paper, a composite oxide catalyst consisting of NiO and ZnO was prepared by homogeneous precipitation method, which was used to activate peroxymonosulfate (PMS) to remove bisphenol A (BPA) in water. 95.26% BPA removal and 67.11% total organic carbon (TOC) removal were obtained under the optimum condition. Characterization and theoretical calculations (DFT) of the catalyst proved that electron rearrangement occurred in oxygen vacancy modified heterojunction catalysts. It resulted in the formation of acidic sites (NiO) and alkaline sites (oxygen vacancies) on the surface of the catalyst, thus promoting the adsorption and activation of PMS. According to the quenching experiments, a typical surface-bound radical reaction system was proposed. The reactive oxygen species (ROS) in the system were surface-bond SO4•−, surface-bond•OH and1O2. Finally, the BPA degradation pathways and the activation mechanism of PMS were analyzed in detail.