摘要
采用分步合成方法将Cu_(2)O纳米颗粒原位还原组装到C_(3)N_(4)/BiVO_(4)表面,设计并合成了C_(3)N_(4)/BiVO_(4)/Cu_(2)O复合材料.在该过程中,首先将具有光氧化能力的BiVO_(4)与C_(3)N_(4)复合制备出C_(3)N_(4)/BiVO_(4)复合物,进一步通过原位合成法在C_(3)N_(4)/BiVO_(4)复合物表面沉积Cu_(2)O纳米颗粒制备出C_(3)N_(4)/BiVO_(4)/Cu_(2)O复合材料.通过高分辨透射电镜和高分辨扫描电镜,X射线粉末衍射,紫外-可见光谱及荧光光谱等测试方法对材料的结构、形貌与组成进行了系统的表征.在纯水体系中,光催化研究表明该复合材料具有较好的二氧化碳到甲醇的转化效率,复合材料的形成有利于促进光生电子和空穴的分离,从而提高光催化性能.
With water as the source of electrons and protons, CO_(2) photoreduction to prepare clean energy and chemical raw materials is one of the promising practical strategies in the artificial photosynthesis. In this field, exploring efficient and low-cost photocatalyst is a challenging topic. Recently, the low-cost and earth-abundant element-based semiconductor Cu_(2)O have been explored to drive CO_(2) photoreduction under visible light irradiation, owing to its opportune band gap. However, self-light corrosion and low separation efficiency of photogenerated carrier seriously limit its practical application in CO_(2) photoreduction.Studies have shown that constructing Cu_(2)O-based heterostructures represents a promising way to accelerate the separation of photogenerated carrier and facilitate electron transmission. In this paper, a step-by-step synthesis method was used to assemble Cu_(2)O nanoparticles on the C_(3)N_(4)/BiVO_(4) surface, resulting in the C_(3)N_(4)/BiVO_(4)/Cu_(2)O composite nanomaterials.In this process, the C_(3)N_(4)/BiVO_(4) composite was first prepared by combining photooxidative BiVO_(4) with C_(3)N_(4), and then Cu_(2)O nanoparticles were deposited on the surface of the C_(3)N_(4)/BiVO_(4) composite by in-situ reduction to prepare the C_(3)N_(4)/BiVO_(4)/Cu_(2)O compositematerial.The structure and morphology of this material were systematically characterized by high-resolution transmission electron microscopy and high-resolution scanning electron microscopy, X ray powder diffraction and other test methods.In a pure water system, photocatalytic studies revealed that the C_(3)N_(4)/BiVO_(4)/Cu_(2)O composite material shows effective photocatalytic properties for the photoreduction of carbon dioxide to methanol. The yield of methanol can reach to 17.2 μmol·g^(-1)·h^(-1), much superior to that of C3N4, C_(3)N_(4)/BiVO_(4), and other catalysts in related works. Meanwhile, ethanol, methane, carbon monoxide, formic acid and other products cannot be detected in the reduction products. The ultravi
作者
张麒
殷金越
田志远
徐万超
杨娜
姚爽
张志明
ZHANG Qi;YIN Jin-yue;TIAN Zhi-yuan;XU Wan-chao;YANG Na;YAO Shuang;ZHANG Zhi-ming(Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion,Institute for New Energy Materials and Low Carbon Technologies,School of Chemistry and Chemical Engineering,Tianjin University of Technology,Tianjin 300384,China)
出处
《分子科学学报》
CAS
北大核心
2021年第4期335-342,共8页
Journal of Molecular Science
基金
大学生创新创业训练计划资助项目(202010060031)
国家自然科学基金资助项目(21971190)。
关键词
复合材料
光催化
CO_(2)还原
甲醇
水氧化
composite
photocatalysis
carbon dioxide reduction
methanol
water oxidation
