广西林业科学2025，Vol.54Issue(4)：417-426,10.DOI:10.19692/j.issn.1006-1126.20250408
石墨相氮化碳光催化氧气选择性氧化肉桂醛制苯甲醛
Selective Oxidation of Cinnamaldehyde to Benzaldehyde by Graphene Phase Nitrocarbon Photocatalysis with Oxygen
摘要
Abstract
In order to meet growing market demand for natural benzaldehyde,graphene phase nitrocarbon(g-C3N4)catalyst was prepared via thermal polymerization and morphology was characterized.Using cinnamaldehyde as model reactant and oxygen(O₂)as oxidant,effects of different solvents(acetonitrile,ethanol,N,N-dimethylfor-mamide and methanol)and catalyst contents on photocatalytic performance were analyzed to optimize reaction conditions.Reaction mechanism was investigated through comparative experiments with different reactants(sty-rene,cinnamic acid and trans-4-phenyl-3-buten-2-one),theoretical calculations and quenching experi-ments.Results showed that g-C3N4 exhibited high catalytic performance for selective oxidation of cinnamalde-hyde to benzaldehyde.Optimal reaction effect was achieved with catalyst content of 0.250 mmol,under oxygen atmosphere with light irradiation,using acetonitrile as solvent.Aldehyde group in reactant molecules contribut-ed to enhancing benzaldehyde selectivity.Intramolecular weak interactions(e.g.,van der Waals forces,hydro-gen bonding)and spatial structure influenced adsorption of reactants on catalyst surface and reaction pathways.Reaction was primarily driven by free radical,with superoxide anion radical(·O₂⁻)being key active intermedi-ate for benzaldehyde formation.Photogenerated holes(h⁺)played important role in generation of·O₂⁻.Hydroxyl radical(·OH)and singlet oxygen(¹O₂)were mainly involved in side reaction pathway,leading to formation of by-products.关键词
石墨相氮化碳/光催化/选择性氧化/肉桂醛/苯甲醛Key words
graphene phase nitrocarbon/photocatalysis/selective oxidation/cinnamaldehyde/benzaldehyde分类
化学化工引用本文复制引用
杨旖璇,罗轩,苏通明,谢新玲,秦祖赠..石墨相氮化碳光催化氧气选择性氧化肉桂醛制苯甲醛[J].广西林业科学,2025,54(4):417-426,10.基金项目
广西自然科学基金项目(2022GXNSFAA035449) （2022GXNSFAA035449）
