沸石负载Md,N共掺杂TiO2光催化性能  

Preparation of zeolite loaded with Mn,N co-doped TiO2 and its photocatalysis propertips

作　　者：李涛 邱一武[3] 秦伟 吴晓宏[1] LI Tao;QIN Yiwu;QIN Wei;WU Xiaohong(School of Chemistry and Chemical Engineering,Harbin Institute of Technology,Harbin 150001,China;Science and TechnoloK on Reliability and Environmental Engineering Laboratory,Beijing Institute of Spacecraft Environmeni Engineering,Beijing 100094,China;Schooi of Material.Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]哈尔滨工业大学化工与化学学院,哈尔滨150001 [2]北京卫星环境工程研究所可靠性与环境工程技术重点实验室,北京100094 [3]哈尔滨工业大学材料科学与工程学院,哈尔滨150001

出　　处：《哈尔滨工业大学学报》2020年第5期9-16,共8页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金(51671074)。

摘　　要：为提高传统TiO2光催化剂的可见光催化活性,本文采用溶胶-凝胶法合成了Mn,N共掺杂TiO2光催化剂,改善了传统光生载流子易复合的问题;进一步采用沸石作为载体对改性后的TiO2样品进行负载,解决了传统光催化剂存在的难分离回收问题,以达到光催化剂可重复使用的目的.借助X-射线衍射仪、扫描电子显微镜、紫外分光光度计、傅立叶变换红外光谱仪等测试手段对Mn,N共掺杂TiO2光催化剂的结构、元素组成、微观形貌和光催化降解性能进行系统分析与研究.研究结果表明,沸石负载Mn,N共掺杂TiO2的样品较未改性的TiO2样品具有更高的光催化降解活性,在可见光照射下,在最优掺杂条件下获得的TiO2光催化剂在60 min内对孔雀石绿的降解率可达到97%,这主要归因于猛离子掺杂能够对TiO2光生载流子的复合产生抑制作用,促进光生电荷分离,与此同时氮元素掺杂可有效拓宽TiO2半导体光催化剂光响应范围.此外,经过5次循环使用后,对孔雀石绿的降解率没有较大程度的减弱,依然能够维持在88%以上,表明沸石负载Mn,N共掺杂TiO2的样品具有较好的光催化循环稳定性.In orde to improvv the visibie lighi catalytic activity of traditionai TiO2 photocatalysi,Mn,N cc-doped TiO2 photocatalysi was synthesized by sol-gel method,which Onproved the problem of easy recombination of photogenerated carriers.Furthei,zeoliie was used as a carriey i solve the problem of difficuli separation and recovery of the ccnventionai photgcatalysi,achieving the purpose of reusable.The costal phase stmeturo,elemeni composition,microtopography,and photgcatalytje activity of TiO2 photgcatalyst were characteozed by XRD,SEM,UV-via,and FTIR.RvuVs show that Mn,N cc-doped TiO2/zeolite composites had higheo activity than pastme TiO2 The decradation rate of malachite green io the T1O2 photocatalysi obtained undeo optimai doping conditions could reach 97% within 60 min in visible light,which was becauso doping could inhibit the recambination of TiO2 photooenerated caraerr and promote charoe separation.Meanwhile,nitrooen doping could dectively broaden the photoresponse range of TiO2-Moreovea,after fivv usage cycles of Mn,N co-doped TiO2 zeolite composites,the decradation rate of malachite green was not greatly reduced,maintaining above 88%,which indicates that the Mn,N co-doped TiO2/zeolite composites havv good photocatalytic cycle stability.

关 键 词：TIO2 光催化 沸石 掺杂 溶胶-凝胶法 

分 类 号：TQ426.94[化学工程]