Novel NiCo2S4/CS membranes as efficient catalysts for activating persulfate and its high activity for degradation of nimesulide
Novel NiCo2S4/CS membranes as efficient catalysts for activating persulfate and its high activity for degradation of nimesulide
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DOI：
10.1016/j.cej.2019.122517
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发表时间：
2020-02
影响因子：
15.1
通讯作者：
Zhongjuan Wang;Lichao Nengzi;Xinyi Zhang;Zhuanjun Zhao;Xiuwen Cheng
中科院分区：
文献类型：
--
作者：
Zhongjuan Wang;Lichao Nengzi;Xinyi Zhang;Zhuanjun Zhao;Xiuwen Cheng
近年来，基于硫酸根的高级氧化技术成为去除新兴有机污染物的有效和常用技术。采用水热法合成了NiCo 2S 4/CS复合材料，并通过X射线衍射（XRD）、扫描电镜（SEM）、透射电镜（TEM）、BET和红外光谱（FT-IR）等手段对复合材料进行了表征。以NiCo 2S 4/CS复合物为催化剂，活化PS降解尼美舒利。结果表明，NiCo 2S 4/CS复合材料具有最高的催化活性，当催化剂用量为0.1 g/L，过硫酸盐用量为0.4 g/L时，10 min内尼美舒利降解率可达92%。采用真空抽滤法制备NiCo 2S 4/CS膜，首次降解尼美舒利达到94%以上，6次重复实验达到80%以上，表明该催化剂便于回收和重复使用。通过自由基猝灭实验、XPS和电化学方法（LSV和EIS）对尼美舒利的降解机理进行了研究，结果表明，尼美舒利的降解可能是非自由基和自由基两种途径共同作用的结果，但SO 4自由基的点−仍是主要的降解形式。本研究为水处理中新兴有机污染物的氧化技术提供了一种新型的硫化物NiCo 2S 4/CS膜。
In recent years, sulfate radicals-based advanced oxidation process becomes an effective and common technique for elimination of emerging organic contaminants. In this study, novel NiCo2S4/CS composite was synthesized through hydrothermal method, with the physicochemical properties being characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microcopy (TEM), Brunauer-Emmett-Teller (BET) and Fourier Transform infrared spectroscopy (FT-IR). Then, NiCo2S4/CS composite acted as catalyst to activate PS for nimesulide degradation. The results showed that NiCo2S4/CS composite owned the highest activity compared with pure NiCo2S4and carbon sphere (CS), achieving 92% nimesulide degradation in 10 min with 0.1 g/L catalyst and 0.4 g/L persulfate. Furthermore, the NiCo2S4/CS membrane was fabricated by vacuum filtration, and 94% and 80% above nimesulide degradation were realized for the first time and after six times repeated experiment, which demonstrated that the catalyst was convenient to achieve recovery and reusability. In addition, the radical quenching experiment, XPS and the electrochemical methods (LSV and EIS) were measured to investigate the possible mechanism pathway, the results of which showed that both the non-radical pathway and radical pathway might attribute to nimesulide degradation, while the SO4radical dot−remained the dominant species. This research provided a novel sulfide NiCo2S4/CS membrane for the oxidative technique for emerging organic contaminants in water treatment.