硫掺杂高比表面积g-C3N4的制备及其光催化性能的研究  

Preparation of sulfur-doped g-C3N4 with high specific surface area and study on its photocatalytic properties

作　　者：时晓羽 李会鹏[1] 赵华[1] 张杰 SHI Xiao-yu;LI Hui-peng;ZHAO Hua;ZHANG Jie(College of Chemistry,Chemical Engineering and Environmental Engineering,Liaoning Shihua University,Fushun 113001,China)

机构地区：[1]辽宁石油化工大学化学化工与环境学部,辽宁抚顺113001

出　　处：《现代化工》2020年第4期167-172,共6页Modern Chemical Industry

摘　　要：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 electronhole 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 and4. 83 times respectively that over p-C3N4.The 1. 5% S-p-C3N4 catalyst still remains high catalytic activity after 5 cycles of uses.

关 键 词：石墨相氮化碳 硫掺杂 光催化 

分 类 号：O641[理学—物理化学]