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Metal-free polymeric (SCN)n photocatalyst with adjustable bandgap for efficient organic pollutants degradation and Cr(VI) reduction under visible-light irradiation
Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2020-07-02 , DOI: 10.1016/j.cej.2020.126147
Jie Gong , Yuan Li , Yan Zhao , Xiaoyong Wu , Junting Wang , Gaoke Zhang

The non-metal organic polymers have attracted increasing attentions in the photocatalysis field because of their low cost, metal-free, visible-light responsive, easy preparation and high stability. Herein, metal-free (SCN)n polymers with various polymerization degrees were prepared by a facile, low cost and environmentally friendly grinding method and presented excellent visible-light photocatalytic performance for organic pollutants degradation and Cr(VI) reduction. Owing to their π conjugated structure, all the as-prepared (SCN)n polymers exhibited excellent visible-light absorption properties up to 550 nm, which were much better than that of bulk g-C3N4. Furthermore, both experiments and theoretical calculations unveiled that the peculiar chain structure, LUMO potential, charge separation and molecular oxygen motivation of (SCN)n polymers could be adjusted by tuning the polymerization degrees of samples. Therefore, the photocatalytic properties of (SCN)n polymers could be significantly improved by optimizing the polymerization degrees of samples. Besides, the possible photocatalytic degradation pathways of antibiotic Tetracycline (TC) over (SCN)n polymer was also studied based on liquid chromatography-tandem mass spectrometry (LC-MS) analysis. The developed metal-free (SCN)n polymer in this work proposed new thinking for the photocatalysis in water purification.



中文翻译:

具有可调带隙的无金属聚合物(SCN)n光催化剂,可在可见光照射下有效降解有机污染物并减少Cr(VI)

非金属有机聚合物由于其低成本,无金属,对可见光敏感,易于制备和高稳定性而在光催化领域引起了越来越多的关注。本文中,通过简便,低成本和环保的研磨方法制备了具有各种聚合度的无金属(SCN)n聚合物,该聚合物具有出色的可见光光催化性能,可降解有机污染物和还原Cr(VI)。由于它们的π共轭结构,所有制备的(SCN)n聚合物在550 nm处均表现出优异的可见光吸收性能,远优于块状gC 3 N 4。。此外,实验和理论计算均表明,可以通过调节样品的聚合度来调节(SCN)n聚合物的特殊链结构,LUMO势,电荷分离和分子氧动机。因此,通过优化样品的聚合度可以显着提高(SCN)n聚合物的光催化性能。此外,还基于液相色谱-串联质谱法(LC-MS)分析了抗生素四环素(TC)在(SCN)n聚合物上的可能的光催化降解途径。这项工作中开发的无金属(SCN)n聚合物为水净化中的光催化作用提出了新的思路。

更新日期:2020-07-13
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