低压快速氢化引入氧空位增强TiO_(2)光催化降解性能  

Low pressure rapid hydrogenation induced oxygen vacancy toenhance the photocatalytic degradation performance of TiO_(2)

作　　者：陈峰磊 杨万林 朱俊奎 魏秋平[2] 张龙 李静 马莉[1] CHEN Fenglei;YANG Wanlin;ZHU Junkui;WEI Qiuping;ZHANG Long;LI Jing;MA Li(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China;School of Materials Science and Engineering,Central South University,Changsha 410083,China;School of Materials Science and Engineering,Changsha University of Science and Technology,Changsha 410114,China)

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]中南大学材料科学与工程学院,长沙410083 [3]长沙理工大学材料科学与工程学院,长沙410114

出　　处：《粉末冶金材料科学与工程》2023年第6期545-553,共9页Materials Science and Engineering of Powder Metallurgy

基　　金：国家“十四五”重点研究发展计划(2021YFB3701800);国家自然科学基金资助项目(52202056,52274370,52071345,51874370);广东省“十三五”重点研究开发项目(2020B01085001);湖南省教育厅资助科研项目(20C0037);湖南省高新技术产业科技创新引领计划(2022GK4037,2022GK4047);粉末冶金国家重点实验室自主课题(621022230)。

摘　　要：利用管式炉在300、400和500℃对TiO_(2)光催化剂(P25)进行低压快速氢化处理,研究氢化温度对样品物相结构、光电化学性能及催化降解活性的影响。结果表明:随氢化温度升高,P25氧空位浓度、光生载流子分离效率、可见光吸收性能、载流子浓度以及光催化活性均先增大后减小,400℃氢化处理1 h的P25具有最佳上述性能。P25的BET(Brunauer-Emmett-Teller)比表面积对氢化温度的变化不敏感,说明低压快速氢化可在避免比表面积损失的同时引入氧空位,抑制电子空穴对的复合,提高光吸收性能和载流子浓度,从而提升P25的光催化性能。400℃氢化处理1 h后,P25的反应速率常数是未处理P25的1.63倍。A tube furnace was used to perform low-pressure rapid hydrogenation treatment on TiO_(2) photocatalyst(P25)at 300,400,and 500℃,and the effects of hydrogenation temperature on the phase structure,photoelectrochemical performance,and catalytic degradation activity of the sample were studied.The results show that the oxygen vacancy concentration,photogenerated carrier separation efficiency,visible light absorption performance,carrier concentration,and photocatalytic activity of P25 appear to first increase and then decrease as the hydrogenation temperature increases.P25 hydrogenated at 400℃ for 1 h has the best performance above.BET(Brunauer-Emmett-Teller)specific surface area of P25 is not sensitive to the change of hydrogenation temperature,indicating that low-pressure rapid hydrogenation can introduce oxygen vacancies while avoiding loss of specific surface area,inhibit the recombination of electron-hole pairs,improve light absorption performance and carrier concentration,thereby improving P25 photocatalytic performance.After hydrogenation treatment at 400℃ for 1 h,the reaction rate constant of P25 is 1.63 times than that of untreated P25.

关 键 词：TiO_(2) 氢化处理 氧空位 四环素 光催化降解 

分 类 号：TQ426[化学工程]