石墨相氮化碳（g-C₃N₄）较低的比表面积以及高的光生电子-空穴复合几率严重限制了其应用。以三聚氰胺[C₃N₃（NH₂）₃]为原料，采用模板剂法制备了高比表面积的石墨相氮化碳（p-C₃N₄），并通过热聚合的方式将硫掺杂于p-C₃N₄中制备硫掺杂高比表面积石墨相氮化碳（S-p-C₃N₄）。通过XRD、FT-IR、BET、UV-Vis、PL对催化剂进行表征。并在500 W氙灯（配以420 nm滤光片）照射下通过光催化降解罗丹明B、光催化还原CO₂和光催化水解制氢3种方式对催化活性进行考察。结果表明，硫掺杂能够有效地降低光生电子-空穴的复合几率，提高光催化活性。其中1.5% S-p-C₃N₄表现出最佳活性，降解罗丹明B的速率是p-C₃N₄的15倍，生成CO和CH₄的速率是p-C₃N₄的3.6、3.1倍，产氢速率分别是p-C₃N₄的4.83倍。且1.5% S-p-C₃N₄催化剂循环使用5次后依然具有很高的催化活性。

Graphite-phase carbonitride (g-C₃N₄) has a low specific surface area and a high photogenerated electron-hole recombination probability,which severely limits its application.The p-C₃N₄ with a high specific surface area is prepared via template method with melamine as raw material.Sulfur-doped S-p-C₃N₄ with a high specific surface area is prepared through thermal polymerization method by doping sulfur powder into p-C₃N₄,which is used as visible light catalyst.The prepared catalyst is subjected to a series of characterizations such as XRD,FT-IR,BET,UV-Vis and PL.Its catalytic activity is evaluated by photocatalytic degradation of Rhodamine B,photocatalytic reduction of CO₂ and photocatalytic hydrolysis to hydrogen under 500 W xenon lamp matching with 420 nm optical filter.The characterization results show that sulfur-doping can effectively reduce the recombination probability of photo-electron-hole and improve the photocatalytic activity.Among the prepared catalysts,1.5% S-p-C₃N₄ shows the best activity,over which the degrading rate of Rhodamine B,the generation speed of CO and CH₄,and hydrogen production rate are 15,3.6,3.1 and 4.83 times respectively that over p-C₃N₄.The 1.5% S-p-C₃N₄ catalyst still remains high catalytic activity after 5 cycles of uses.

时晓羽(1992-),女,硕士研究生,研究方向为现代催化剂的制备与清洁燃料生产,2411727276@qq.com