N-TiO_(2)催化剂的制备及其在蓝光LED光照下对有机污染物的降解  

Preparation of N-TiO_(2)photocatalyst and its degradation of organic pollutants under blue LED light

作　　者：邹敬桃 李旋坤 李光辉 张文启[1] 孙雯 ZOU Jingtao;LI Xuankun;LI Guanghui;ZHANG Wenqi;SUN Wen(School of Chemistry and Chemical Engineering,Shanghai University of Engineering Science,Shanghai 201620,China)

机构地区：[1]上海工程技术大学化学化工学院,上海201620

出　　处：《上海工程技术大学学报》2023年第4期351-358,共8页Journal of Shanghai University of Engineering Science

基　　金：山东省自然科学基金青年项目资助(ZR2021QE223)。

摘　　要：分别采用机械化学法、水解沉淀法和溶胶-凝胶法合成了氮掺杂二氧化钛(N-TiO_(2))催化剂,以亚甲基蓝(Methylene Blue,MB)和盐酸四环素(Tetracycline hydrochloride,TTC)为目标污染物.光催化实验及催化剂的形貌表征对比表明,水解沉淀法合成的N-TiO_(2)-H具有较高蓝光催化活性且颗粒分布均匀,无团聚现象.选用N-TiO_(2)-H进一步探讨煅烧温度、催化剂投加量、pH及降解底物初始浓度对光催化降解反应的影响.研究表明,400℃煅烧下制备的N-TiO_(2)-H具有最佳蓝光催化活性.当反应pH=7时,0.5 g/L N-TiO_(2)-H在460 nm蓝光照射下2 h可将初始浓度为5 mg/L的MB去除89.7%;当pH=5时,光照1.5 h可将初始浓度为50 mg/L的TTC,去除75.2%.Nitrogen-doped titanium dioxide(N-TiO_(2))photocatalyst was synthesized by mechanochemical,hydrolysis precipitation and sol-gel method respectively.With the application of Methylene blue(MB)and tetraccycline hydrochloride(TTC)as the target pollutants,N-TiO_(2)-H synthesized by hydrolysis precipitation method has high photocatalysis activity under blue LED irradiation,uniform particle distribution and no agglomeration.Therefore,N-TiO_(2)-H was selected to study the effects of calcination temperature,catalyst dosage,pH and initial concentration of organic pollutants by photocatalysis.The results showed that N-TiO_(2)-H calcined at 400℃had the best photocatalytic activity under blue LED light irradiation.Under the dosage of 0.5 g/L N-TiO_(2)-H,the photocatalytic degradation of MB with initial concentration of 5 mg/L,pH=7,MB removal was 89.7%after 2 h,and the photocatalytic degradation of TTC with initial concentration of 50 mg/L,pH=5,TTC removal was 75.2%after 1.5 h.

关 键 词：氮掺杂二氧化钛 蓝光LED 光催化 亚甲基蓝 盐酸四环素 

分 类 号：O643.36[理学—物理化学]