无掺杂g-C_(3)N_(4)促进光催化甲苯氧化  

Undoped g-C_(3)N_(4) boosted photocatalytic oxidation of toluene

作　　者：石雄飞 高燊原 王晓钟[1] 戴立言[1] SHI Xiongfei;GAO Shenyuan;WANG Xiaozhong;DAI Liyan(Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology,College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]浙江省化工高效制造技术重点实验室,浙江大学化学工程与生物工程学院,浙江杭州310058

出　　处：《高校化学工程学报》2025年第1期85-94,共10页Journal of Chemical Engineering of Chinese Universities

摘　　要：以O_(2)选择性氧化甲苯转化为高附加值氧化物意义重大且具有挑战。为解决甲苯C(sp^(3))-H难以活化问题,成功将无掺杂的g-C_(3)N_(4)应用于甲苯氧化反应,展现出优异的光催化氧化活性。经二次热剥离处理的g-C_(3)N_(4),比表面积显著增大,可以提供更多的活性位点,同时促进了光生电子-空穴的有效分离与迁移,大的比表面积也有利于对甲苯和O_(2)的吸附。经优化后的光催化剂在400~410 nm光照条件下,以O_(2)为氧化剂,室温条件反应8 h,甲苯转化率为65.8%,苯甲醛和苯甲酸总选择性为86.2%,甲苯转化速率可达2056μmol·(g·h)^(-1)。Selective oxidation of toluene into high value-added oxides is significant and challenging with O_(2).An undoped g-C_(3)N_(4)was prepared by a simple thermal exfoliation method to solve the difficulty of toluene C(sp^(3))-H activation,which showed excellent photocatalytic activity.The specific surface area of g-C_(3)N_(4)was significantly increased after secondary thermal exfoliation treatment,which provides more active sites and promotes the effective separation and migration of photogenerated electron-holes.The large specific surface area is conducive to the adsorption of toluene and O_(2).The optimized photocatalyst displays 86.2%total selectivity of benzaldehyde and benzoic acid,with 65.8%conversion under 400~410 nm light irradiation for 8 h at room temperature using O_(2)as oxidant,while the toluene conversion rate is 2056μmol·(g·h)^(-1).

关 键 词：甲苯 光催化 氧气氧化 热剥离 g-C_(3)N_(4) 

分 类 号：TQ203.2[化学工程—有机化工]