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New insights into the effect of adsorption on catalysis in the metal-free persulfate activation process for removing organic pollutants
Separation and Purification Technology ( IF 8.6 ) Pub Date : 2021-05-09 , DOI: 10.1016/j.seppur.2021.118923
Liang Liang , Xiuyan Yue , Shuying Dong , Jinglan Feng , Jianhui Sun , Yuwei Pan , Minghua Zhou

Coupling adsorption and advanced oxidation processes (AOPs), two widely used wastewater treatment technologies, has been an attractive idea pursued by many researchers. Although many studies have demonstrated that adsorption could facilitate AOPs such as persulfate (PS) activation, the inhibitory effect of adsorption on PS activation was ignored. In this work, both as adsorbents and catalysts, sucrose-derived carbon xerogels (CXs) were prepared to investigate the effect of adsorption on PS activation. The results showed that the specific surface areas (SSAs) and N contents of CXs varied with the HCl concentration. Among different CXs, CX-0.5 with the highest SSA and N content exhibited the highest adsorption capacity and catalytic activity for acid orange 7 (AO7) degradation by simultaneously adding CXs and PS, where the promoting effect of adsorption on catalysis was found. Quenching tests demonstrated that degradation of pollutants in the CX-0.5/PS system were mainly by nonradical pathway. However, the catalytic activities of CXs were inhibited after the pre-adsorption of AO7 on CXs. Comparing the molecular structures of several compounds, the sulfonic group on chemicals might play a crucial role in the inhibitory effect. We concluded that if CXs have the same adsorption sites for pollutants and PS, adsorption of pollutants would inhibit the catalytic PS activation. These findings provided a comprehensive understanding of the effect of adsorption on AOPs, which had a significant guidance for future researches and applications.



中文翻译:

吸附对无金属过硫酸盐活化过程中催化去除有机污染物的影响的新见解

耦合吸附和高级氧化过程(AOP)是两种广泛使用的废水处理技术,已成为许多研究人员追求的诱人想法。尽管许多研究表明吸附可以促进AOP的活化,例如过硫酸盐(PS)的活化,但是吸附对PS活化的抑制作用却被忽略了。在这项工作中,作为吸附剂和催化剂,都准备了蔗糖衍生的碳干凝胶(CXs),以研究吸附对PS活化的影响。结果表明,CXs的比表面积和N含量随HCl浓度的变化而变化。在不同的CX中,通过同时添加CX和PS,SSA和N含量最高的CX-0.5表现出最高的吸附能力和对酸性橙7(AO7)降解的催化活性,在那里发现了吸附对催化的促进作用。淬火测试表明,CX-0.5 / PS系统中污染物的降解主要是通过非自由基途径进行的。但是,AO7在CXs上的预吸附后,CXs的催化活性被抑制。比较几种化合物的分子结构,磺酸基对化学物的抑制作用可能至关重要。我们得出的结论是,如果CX对污染物和PS的吸附位置相同,则污染物的吸附将抑制PS的催化活化。这些发现提供了对吸附对AOPs的影响的全面理解,为将来的研究和应用提供了重要的指导。5 / PS系统主要是通过非自由基途径。但是,AO7在CXs上的预吸附后,CXs的催化活性被抑制。比较几种化合物的分子结构,磺酸基对化学物的抑制作用可能至关重要。我们得出的结论是,如果CX对污染物和PS的吸附位置相同,则污染物的吸附将抑制PS的催化活化。这些发现提供了对吸附对AOPs的影响的全面理解,为将来的研究和应用提供了重要的指导。5 / PS系统主要是通过非自由基途径。但是,AO7在CXs上的预吸附后,CXs的催化活性被抑制。比较几种化合物的分子结构,磺酸基对化学物的抑制作用可能至关重要。我们得出的结论是,如果CX对污染物和PS的吸附位置相同,则污染物的吸附将抑制PS的催化活化。这些发现提供了对吸附对AOPs的影响的全面理解,为将来的研究和应用提供了重要的指导。我们得出的结论是,如果CX对污染物和PS的吸附位置相同,则污染物的吸附将抑制PS的催化活化。这些发现提供了对吸附对AOPs的影响的全面理解,为将来的研究和应用提供了重要的指导。我们得出的结论是,如果CX对污染物和PS的吸附位置相同,则污染物的吸附将抑制PS的催化活化。这些发现提供了对吸附对AOPs的影响的全面理解,为将来的研究和应用提供了重要的指导。

更新日期:2021-05-13
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