钒酸盐化合物的合成及其可见光驱动光催化应用的最新进展

M. Mirzaei, Asieh Akhoondi, W. Hamd, Jorge Noé Díaz de León, R. Selvaraj
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引用次数: 3

摘要

光催化被认为是解决能源短缺和环境污染问题的一种经济有效的新方法。尽管这种方法的应用似乎是可行的,但寻找一种具有合适带隙和可见光灵敏度的高效稳定的光催化剂仍然具有挑战性。在此背景下,钒酸盐化合物光催化剂被合成并作为新兴的复合材料使用,并通过元素掺杂和形态修饰提高了其效率。本文综述了钒酸盐光催化化合物的主要合成方法和设计。此外,还讨论了钒酸盐微观结构在各种光催化应用中的影响,如制氢、二氧化碳还原、有机污染物和重金属的去除。例如,2D-1D BiVO4/CdS异质结构光催化剂的应用使苯甲醇产氢量比纯BiVO4提高了40倍。同样,与纯InVO4相比,InVO4/Bi2WO6复合材料在将CO2还原为CO方面具有优越的光催化能力。该异质结构的CO产率可达18 μmol.g−1.h−1。在去除有机污染物方面,使用蒙脱土/BiVO4结构,仅需照射2小时即可完全去除Brilliant Red 80染料。最后,采用BiVO4/rGO/g-C3N4优化光催化剂结构,将水中重金属铜还原至90%。还讨论了用于增强光催化活性的修饰钒酸盐化合物的其他实例。
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New updates on vanadate compounds synthesis and visible-light-driven photocatalytic applications
Photocatalysis is known as a new and cost-effective method to solve the problems of energy shortage and environmental pollution. Although the application of this method seems practical, finding an efficient and stable photocatalyst with a suitable bandgap and visible-light sensitivity remains challenging. In this context, vanadate compounds photocatalysts have been synthesized and used as emerging composites, and their efficiency has been improved through elemental doping and morphology modifications. In this review, the major synthesis methods, and the design of the latest photocatalytic compounds based on vanadate are presented. In addition, the effect of vanadate microstructures on various photocatalytic applications such as hydrogen production, CO2 reduction, and removal of organic pollutants and heavy metals are discussed. For instance, the application of a 2D-1D BiVO4/CdS heterostructure photocatalyst enhances 40 times the hydrogen production from benzyl alcohol than pure BiVO4. Similarly, the InVO4/Bi2WO6 composite has a superior photocatalytic capability for the reduction of CO2 into CO compared to pure InVO4. A CO production rate of 18 μmol.g−1.h−1 can be achieved by using this heterostructure. Regarding the organic pollutants’ removal, the use of Montmorillonite/BiVO4 structure allows a complete removal of Brilliant Red 80 dye after only 2 hours of irradiation. Finally, copper heavy metal is reduced to 90 % in water, by using BiVO4/rGO/g-C3N4 optimized photocatalyst structure. Other examples on decorated vanadate compounds for enhancing photocatalytic activities are also treated.
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