石墨相氮化碳（g-C₃N₄）作为一种不含金属的光催化剂,因成本低、简单易得和良好的光响应特性受到关注。然而,电子-空穴对的高复合率阻碍了其广泛的应用。以三聚氰胺为原料、尿素为致孔剂,通过水热结合煅烧方法制备出多孔g-C₃N₄纳米片（PCNS）,然后采用化学还原法将金（Au）负载在PCNS表面,并对反应体系中的金含量进行调控。通过X射线衍射（XRD）、红外光谱（FT-IR）、拉曼（Raman）光谱、透射电镜（TEM）、紫外-可见漫反射光谱（UV-Vis DRS）和电化学测试等对复合材料进行了表征。与PCNS相比,Au/PCNS复合材料不仅具有更强的光吸收性能,而且电子和空穴的复合率也明显降低。同时对复合材料的可见光分解水产氢性能进行了研究,结果发现0.5%Au/PCNS呈现出最优的光催化产氢速率[84.09 μmol/（g·h）],是0.5%Au/g-C₃N₄[1.88 μmol/（g·h）]的44.7倍。

Graphite carbon nitride（g-C₃N₄）,as a metal-free photocatalyst,has attracted much attention due to its low cost, easy availability and good photoresponse characteristics.However,the high recombination rate of electron-hole pairs hinders its wide application.Herein,using melamine as raw material and urea as a porogen,porous g-C₃N₄ nanosheets（PCNS）was prepared by the hydrothermal combined calcination method.Chemical reduction method was used to load Au on the surface of PCNS,and the Au content in the reaction system was also adjusted.The composites were characterized by X-ray diffraction （XRD）,infrared spectroscopy（FT-IR）,Raman spectroscopy（Raman）,transmission electron microscopy （TEM）,ultraviolet visible diffuse reflectance spectroscopy（UV-Vis DRS） and electrochemical tests.In comparison with PCNS,Au/PCNS co-mposite not only had stronger light absorption performance,but the recombination rate of electrons and holes was also signi-ficantly reduced.At the same time,the hydrogen production performance of composite under visible light was studied,and it was found that 0.5%Au/PCNS showed the best photocatalytic hydrogen production rate[84.09 μmol/（g·h）],which was 44.7 times of 0.5%Au/g-C₃N₄[1.88 μmol/（g·h）].