以石墨相氮化碳(g-C3N4)和二水合钨酸钠为原料,采用水热合成法制备了复合材料 g-C3N4/WO3·H2O(CNW-1),通过XRD、XPS、SEM、TEM对其进行了表征,探究了298 K、0.1 MPa条件下其对CO2的可见光催化还原性能,并提出了可能的反应机理.通过调控WO3结晶水含量可以实现CO和CH4的产率调节,在反应 10 h 后,CNW-1 具有最高的 CH4 产率(0.33 μmol/g),而 g-C3N4/WO3(CNW)具有最高的 CO 产率(0.67 μmol/g).该研究为CO2选择性还原为C1化合物提供了一种有效策略,同时突出了以g-C3N4作为半导体构建Z型光催化体系在催化领域的应用潜力.
Preparation and photocatalytic CO2 reduction performance of Z-scheme g-C3N4/WO3·H2O
Composite material g-C3N4/WO3·H2O(CNW-1)was synthesized by hydrothermal reaction from graphite phase carbon nitride(g-C3N4)and sodium tungstate dihydrate.The composite material obtained was then characterized by XRD,XPS,SEM and TEM,and its visible light catalytic CO2 reduction performance at 298 K and 0.1 MPa was evaluated,the possible reaction mechanism was proposed.It was found that the yield of CO and CH4 could be regulated by adjusting the crystal water content in tungsten trioxide.CNW-1 had the highest yield of CH4(0.33 μmol/g),while g-C3N4/WO3(CNW)had the highest CO yield(0.67 μmol/g)after 10 h of reaction.This study provides an effective strategy for the selective reduction of CO2 to C1 compounds,and highlights the potential application of Z-scheme photocatalytic systems constructed from g-C3N4 semiconductor in the field of catalysis.
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