Dual Z-scheme heterojunction g-C3N4/Ag3PO4/AgBr photocatalyst with enhanced visible-light photocatalytic activity
Dual Z-scheme heterojunction g-C3N4/Ag3PO4/AgBr photocatalyst with enhanced visible-light photocatalytic activity
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DOI：
10.1016/j.ceramint.2022.04.176
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发表时间：
2022-08-01
影响因子：
5.2
通讯作者：
Kaneco, Satoshi
中科院分区：
文献类型：
--
作者：
Katsumata, Hideyuki;Molla, Md Ashraful Islam;Kaneco, Satoshi
近年来，开发高效的光催化剂去除水环境中的有机污染物已引起人们极大的兴趣。本文采用原位沉淀-阴离子交换法合成了三元石墨型C3 N4（g-C3 N4）/Ag 3 PO 4/AgBr复合光催化剂，并通过多种光谱和显微技术对其进行了表征。在光催化反应过程中，X射线光电子能谱清楚地说明了金属银的形成在g-C3 N4/Ag 3 PO 4/AgBr复合材料表面。在可见光（> 420 nm）下，该三元复合光催化剂表现出更高的光催化活性，在5 min内即可实现对甲基橙子（MO）的完全脱色。将三元g-C3 N4/Ag 3 PO 4/AgBr杂化物应用于可见光下2-氯苯酚的降解，进一步证实了其优异的光催化活性。此外，猝灭实验表明，空穴（h+）和O-2（.-）是MO脱色过程中的主要攻击物种。g-C3 N4/Ag 3 PO 4/AgBr的光活性增强是由于光生电荷通过双Z方案途径的有效转移/分离以及形成的银颗粒上的电荷复合位点。
Recently, there has been a significant interest in developing high-performance photocatalysts for removing organic pollutants from water environment. Herein, a ternary graphitic C3N4 (g-C3N4)/Ag3PO4/AgBr composite photocatalyst is synthesized using an in-situ precipitation-anion-exchange process and characterized by several spectroscopic and microscopic techniques. During the photocatalytic reaction, X-ray photoelectron spectroscopy clearly illustrated the formation of metallic Ag on the g-C3N4/Ag3PO4/AgBr composite surface. The ternary composite photocatalyst demonstrated an increased photoactivity under visible light (> 420 nm), achieving a complete decolorization of methyl orange (MO) in 5 min. The ternary g-C3N4/Ag3PO4/AgBr hybrid was also applied to the 2-chlorophenol degradation under visible light, further confirming its excellent photocatalytic activity. In addition, quenching experiments revealed that holes (h+) and O-2(.-) were the major attack species in the decolorization of MO. The enhanced photoactivity of g-C3N4/Ag3PO4/AgBr results from the efficient transfer/ separation of photoinduced charges with the dual Z-scheme pathway and the charge recombination sites on the formed Ag particles.