碳氮掺杂氧化钛光催化降解性能研究  

Photocatalytic Degradation Performance of Carbon and Nitrogen Codoped Titanium Oxide

作　　者：吴崇备 汤佳鑫 李璇 刘敬儒 江吉周 WU Chongbei;TANG Jiaxin;LI Xuan;LIU Jingru;JIANG Jizhou(Hebei Key Laboratory of Man-Machine Environmental Thermal Control Technology and Equipment,Hebei Vocational University of Technology and Engineering,Xingtai 054000,China;Hubei Engineering Research Center of Novel Catalytic Materials,Key Laboratory of Green Chemical Engineering Process of Ministry of Education,Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education,School of Environmental Ecology and Biological Engineering,Wuhan Institute of Technology,Wuhan 430205,China)

机构地区：[1]河北科技工程职业技术大学河北省人机环境热控制技术与装备重点实验室,河北邢台054000 [2]武汉工程大学环境生态与生物工程学院新型催化材料湖北省工程研究中心绿色化工过程教育部重点实验室磷资源开发利用教育部工程研究中心,湖北武汉430205

出　　处：《化学与生物工程》2025年第2期24-31,共8页Chemistry & Bioengineering

基　　金：国家自然科学基金项目(62004143);河北省自然科学基金项目(B2023108012);河北省高等学校科学技术研究项目青年拔尖人才项目(BJK2024137);湖北省重点研发计划项目(2022BAA084);邢台市创新能力提升计划项目(2023ZZ096);河北科技工程职业技术大学应用创新项目(302032303);河北科技工程职业技术大学博士科研启动经费项目(3020507)。

摘　　要：通过轻度刻蚀氧化层状前驱体MAX(Ti_(3) AlCN),成功制备了碳氮掺杂氧化钛(CN-TiO_(x))催化剂,通过XRD、TEM、XPS对其形貌与结构进行了表征,通过UV-Vis、Mott-Schottky曲线分析了其光电特性,通过UV-Vis评价了其在模拟太阳光下对亚甲基蓝(MB)的光催化降解性能,通过瞬态光电流响应、电化学阻抗、电子顺磁共振测试及牺牲剂对比实验对其光催化降解机制进行了探究。结果表明,通过控制刻蚀氧化时间,可以精确调控CN-TiO_(x)催化剂的光吸收能力和电荷传输性能;随着刻蚀氧化时间的延长,其光吸收边向可见光区红移,从而促进了光催化过程中的激子跃迁,形成的Ti^(3+)活性位点有助于促进反应物的化学吸附与活化;催化过程中的活性氧物种主要是光生空穴、超氧阴离子自由基和羟基自由基;刻蚀氧化15 h得到的CN 15-TiO_(x)表现出较高的光催化降解性能,在模拟太阳光下对MB的降解率在50 min内达到了88%。We successfully prepared carbon and nitrogen codoped titanium oxide(CN-TiO_(x))catalyst by lightly etching oxidation of the layered precursor MAX(Ti_(3) AlCN),characterized its morphology and structure by XRD,TEM,and XPS,and analyzed its photoelectric properties by UV-Vis spectroscopy and Mott-Schottky curve.Moreover,we evaluated the photocatalytic degradation performance of CN-TiO_(x) against Methylene Blue(MB)under simulated sunlight through UV-Vis.Furthermore,we explored the photocatalytic degradation mechanism through tests of transient photocurrent response,electrochemical impedance,electron paramagnetic resonance,and comparison experiments of sacrificial agent.The results indicate that the light absorption capacity and charge transfer performance of catalyst CN-TiO_(x) can be precisely regulated by controlling the etching oxidation time.As the etching oxidation time prolongs,its light absorption edge shifts towards the visible light region,thereby promoting exciton transitions in the photocatalytic process.The formed Ti^(3+)active sites help promote the chemical adsorption and activation of reactants.The active oxygen species in the catalytic process are mainly photo-generated holes,superoxide anion free radicals,and hydroxyl free radicals.CN 15-TiO_(x) prepared by etching oxidation for 15 h exhibits high photocatalytic degradation performance,with a degradation rate of 88%for MB under simulated sunlight within 50 min.

关 键 词：氧化钛 光催化降解 光吸收能力 电荷分离迁移 

分 类 号：TQ134.11[化学工程—无机化工]