Photochemical reactions of g-C3N4-based heterostructured composites in Rhodamine B degradation under visible light
Photochemical reactions of g-C3N4-based heterostructured composites in Rhodamine B degradation under visible light
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g-C3N4基异质结构复合材料在可见光下降解罗丹明B的光化学反应
DOI：
10.1039/c6ra04430a
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发表时间：
2016-04
期刊：
影响因子：
3.9
通讯作者：
Yang Ping
中科院分区：
文献类型：
--
作者：
Liu Yumeng;Wang Junpeng;Yang Ping
采用溶液法在室温下制备了高效可见光驱动的Ag 2 O/g-C3 N4、Ag/g-C3 N4和BiOBr/g-C3 N4异质结构光催化剂。与Ag/g-C3 N4（1：30质量比）和Ag 2 O/g-C3 N4（2：1质量比）光催化剂相比，BiOBr/g-C3 N4（1：3）复合材料在可见光照射下对罗丹明B（RhB）的降解表现出更高的光催化活性。Ag 2 O/g-C3 N4（1：1，2：1，4：1质量比）和BiOBr/g-C3 N4光降解苯酚RhB染料的反应动力学符合准一级动力学方程ln（C 0/C）= kt，而Ag/g-C3 N4和纯g-C3 N4，Ag 2 O/g-C3 N4（1：20质量比）光降解苯酚RhB染料的反应动力学方程符合零级动力学方程。BiOBr/g-C3 N4复合材料对RhB的降解率最高。二维BiOBr/g-C3 N4光催化剂光催化活性的提高主要归因于形成了II型p-n异质结，以及良好的带隙匹配和两组分之间的协同效应，加速了界面处光生电子-空穴的分离效率。最后，通过活性物种捕获实验，对Ag 2 O/g-C3 N4和BiOBr/g-C3 N4复合材料的光催化和电荷分离机理进行了初步探讨。
Highly efficient visible-light-driven Ag2O/g-C3N4, Ag/g-C3N4, and BiOBr/g-C3N4 heterostructured photocatalysts were prepared by solution synthesis methods at room temperature. Compared with Ag/g-C3N4 (1:30 mass ratio) and Ag2O/g-C3N4 (2:1 mass ratio) photocatalysts, the BiOBr/g-C3N4 composite (1:3) displayed enhanced photocatalytic activities for Rhodamine B (RhB) degradation under visible-light irradiation. The reaction kinetics of phenol RhB dye photodegradation of Ag2O/g-C3N4 (1:1, 2:1, 4:1 mass ratios) and BiOBr/g-C3N4 were fitted with the pseudo-first-order model, ln(C0/C) = kt, while the data of Ag/g-C3N4 and pure g-C3N4, Ag2O/g-C3N4 (1:20 mass ratio) were fitted with the zero-order model. The former has enhanced photocatalytic activity, and BiOBr/g-C3N4 composites exhibit the highest degrading rate for RhB. The enhanced photocatalytic activity of two dimensional BiOBr/g-C3N4 photocatalysts was mainly attributed to the formation of type II p–n heterojunctions, as well as the well-matched band gap and the synergetic effects between two components, which accelerate the separation efficiency of photogenerated electrons–holes at the interface. Finally, possible photocatalytic and charge separation mechanisms of Ag2O/g-C3N4 and BiOBr/g-C3N4 composites were proposed via active species capture experiments.
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