采用热分解法制备了层状g-C3N4 催化剂,并通过超声处理初步提高g-C3N4 的光催化性能,后通过浸渍法引入Pt助剂以进一步提高其催化性能,并对样品进行XRD、低温N2吸附、EDS、XPS、UV-vis 和 EIS 等表征及光催化分解水制氢性能研究.结果表明:适宜的超声时间能够提高催化剂的结晶度,且催化剂的比表面积和孔体积均有所增加,这为光催化制氢反应提供了更多的活性位点.适量Pt 助剂的引入拓展了 g-C3N4 的光吸收带边,降低了催化剂的禁带宽度,降低了催化剂的电阻,促进了光生载流子的产生和迁移,提高了催化剂对光的利用率,其产氢速率可提高超过600倍.
Preparation of High-Performance Pt/g-C3N4 and Its Photocatalytic Hydrogen Production
Layered g-C3N4 catalysts were prepared by thermal decomposition method,and the photocatalytic performance of g-C3N4 was preliminarily improved through ultrasonic treatment.Pt promoters were introduced through impregnation method to further improve its catalytic performance.All samples were characterized by XRD,low-temperature N2 adsorption,EDS,XPS,UV-vis,and EIS,as well as the photocatalytic performance of water splitting for hydrogen production.The experimental results showed that the appropriate ultrasonic time could improve the crystallinity of the catalyst,and the specific surface area and pore volume of the catalyst were increased,which provided more active site for the photocatalytic hydrogen production reaction.The introduction of an appropriate amount of Pt promoter expanded the light absorption band edge of g-C3N4,reduced the band gap of the catalyst,reduced the resistance of the catalyst,promoted the generation and migration of photogenerated carriers,improved the utilization of the catalyst for light,and its hydrogen production rate were increased by more than 600 times.
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