石墨相氮化碳(g-C3N4)光催化CO2还原制备可再生的碳氢燃料为缓解温室效应、解决能源短缺问题提供了可行的方法.石墨相氮化碳因其制备简单、原料廉价、稳定性较高等优势,以 g-C3N4为光催化剂进行 CO2 还原的研究受到广泛关注.因为其存在光生电子和空穴易复合、光利用率低、光催化剂表面对 CO2 的还原产物吸附较强,不易于反应活性位点的再生等问题,使得单一组分光催化剂的 CO2 还原活性非常低.为解决这类问题,国内外学者采用了包括使用元素掺杂、形态调控、缺陷设计、构建半导体异质结和Z型光催化体系等多种方法增强g-C3N4的光催化效率.
Abstract
Graphitic carbon nitride(g-C3N4)photocatalytic CO2 reduction to prepare renewable hydrocarbon fuels provides a feasible method to alleviate the greenhouse effect and solve the problem of energy shortage.Due to its advantages of simple preparation,cheap raw material and high stability,graphitic carbon nitride has attracted extensive attention for CO2 reduction using g-C3N4 as a photocatalyst.Because the photogenerated electrons and holes are easily recombined,light utilization is low,photocatalyst surface has strong adsorbability for the CO2 reduction products,and regeneration of active sites is difficult,the CO2 reduction activity of the single-component photocatalyst is very low.In order to solve these problems,scholars at home and abroad have adopted various methods to enhance the photocatalytic efficiency of g-C3N4,including the use of element doping,morphological control,defect design,the construction of semiconductor heterojunction and Z-type photocatalytic system.
关键词
石墨相氮化碳/光催化还原CO2/半导体异质结/掺杂
Key words
Graphite carbon nitride/Photocatalytic reduction of CO2/Semiconductor heterojunction/Blending
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