【作者】 王吉超； 要红昌； 张琳； 李中军；

【Author】 Ji-Chao Wang;Hong-Chang Yao;Lin Zhang;Zhong-Jun Li;College of Chemistry and Molecular Engineering, Zhengzhou University;

【机构】 郑州大学化学与分子工程学院；

【摘要】 基于设计合成Z-型CO₂可见光催化还原剂,本研究在g-C₃N₄表面生长纳米BiOI,制备了二维/二维结构Bi OI/C₃N₄复合材料。采用TG,XRD,XPS,TEM,DRS等对其结构进行了表征,测定了不同条件下的可见光催化还原CO₂性能。结果表明,所制备材料具有二维/二维异质结构;可见光照射3小时,CO和CH₄产率分别达到4.86和0.18μmol?g_cat^-1?h^-1。同时发现,CH₄/CO产率比随着光强而变化。相对于纯相g-C₃N₄和BiOI,增加的CO₂还原效率可归因于二维/二维异质结的生成及光生电子-孔穴对的Z-型传导机理。更多还原

【Abstract】 2D/2D type of BiOI/C₃N₄ heterostructure was synthesized by the growth of BiOI nanosheets on the surface of g-C₃N₄, based on the design of direct Z-scheme photocatalysts for CO₂ photoreduction. The samples were characterized extensively and the results showed the 2D/2D type Bi OI/C₃N₄ heterojunction was constructed. The photoreduction CO₂ activity of the synthesized materials were investigated in the presence of water vapor, and the maximal CO and CH₄ yield of which attains 4.86 and 0.18 μmol?g_cat^-1?h^-1 after irradiation for 3 h. More attractively, the ratio of CH₄/CO yield was found to be varied with light intensity. The enhanced photocatalytic activity is ascribed to the formation of Z-scheme photocatalysts, which facilitates efficient separation of charge carriers and sufficient reductive potential for CO₂ reduction. The reaction mechanism is proposed and further confirmed experimentally. The results may provide some insights into the design of new Z-scheme 2D/2D type photocatalysts for CO₂ reduction.更多还原