Fabrication of magnetically recoverable photocatalysts using g-C3N4 for effective separation of charge carriers through like-Z-scheme mechanism with Fe3O4 mediator
Fabrication of magnetically recoverable photocatalysts using g-C3N4 for effective separation of charge carriers through like-Z-scheme mechanism with Fe3O4 mediator
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DOI：
10.1016/j.cej.2017.08.131
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发表时间：
2018
影响因子：
15.1
通讯作者：
Zhi Zhu;Pengwei Huo;Ziyang Lu;Yongsheng Yan;Zhi Liu;Weidong Shi;Chunxiang Li;Hongjun Dong
中科院分区：
文献类型：
--
作者：
Zhi Zhu;Pengwei Huo;Ziyang Lu;Yongsheng Yan;Zhi Liu;Weidong Shi;Chunxiang Li;Hongjun Dong
采用热处理方法成功地合成了一种新型高效磁性氧化还原类Z构型光催化剂，它由g-C3N4、硫化镉和Fe3O4氧化还原介体组成。Like-Z构型的CdS/Fe_3O_4/g-C_3N_4光催化剂对多种抗生素具有普遍的降解性能，其光催化活性好于CdS/g-C_3N_4和纯g-C_3N_4。这种优异的光催化性能源于Fe3O4独特的类Z构型结构和氧化还原功能，它有效地分离了空穴-电子，充分利用了光生载流子产生更多的活性自由基。结果表明，当Fe3O4含量为10%时，CdS/Fe3O4/g-C3N4具有较好的催化活性。LIKE-Z构型光催化剂的最佳降解速率常数K约为纯g-C3N4的26倍。文中还详细讨论了Fe3O4的重要作用和光催化机理。本工作不仅提出了一种新颖的类Z-方案材料的设计思想，而且有望根据实际需要，广泛应用于多种抗生素的普遍去除。
A novel efficient magnetic oxidation-reduction like-Z-scheme structure photocatalyst composed of g-C3N4, CdS and the oxidation-reduction mediators of Fe3O4is successfully synthesized by heat treatment methods. The like-Z-scheme CdS/Fe3O4/g-C3N4photocatalyst exhibits universal degradation property on removing kinds of antibiotics, and the photocatalytic activity is better than that of CdS/g-C3N4and pure g-C3N4. The excellent photocatalytic performance is originated from the unique like-Z-scheme structure and oxidation–reduction function of Fe3O4, which effectively separates the hole-electron and sufficiently utilizes the photogenerated carriers for generating more active radicals. The results showed that when the content of Fe3O4is 10%, the CdS/Fe3O4/g-C3N4exhibited superior activity. The best degradation rate constantKin the like-Z-scheme photocatalyst is approximately 26 times of pure g-C3N4. The important role of Fe3O4and the photocatalytic mechanism are also discussed in detail. This work not only puts forward a novel design idea of the like-Z-scheme material, but also is expected to be widely applied to the universal removal of kinds of antibiotics according to the practical requirement.