一步水热法制备锰氮掺杂TiO_(2)及光催化降解室内甲醛  

Preparation of Mn-N-codoped TiO_(2) by one-step hydrothermal methodand photocatalytic degradation of indoor HCHO

作　　者：陈金媛 杨帆 刘露 魏秀珍 CHEN Jinyuan;YANG Fan;LIU Lu;WEI Xiuzhen(College of Environment,Zhejiang University of Technology,Hangzhou 310014,China)

机构地区：[1]浙江工业大学环境学院,浙江杭州310014

出　　处：《浙江工业大学学报》2024年第4期372-379,共8页Journal of Zhejiang University of Technology

摘　　要：采用一步水热法,以四水氯化锰为锰源,尿素为氮源,制备了锰掺杂、氮掺杂以及锰氮共掺杂TiO_(2)光催化剂。采用X射线衍射仪、紫外可见漫反射光谱仪、透射电镜及X射线光电子能谱仪等对样品进行表征;以氙灯模拟太阳光照条件,以气态甲醛为目标污染物,测试了样品的光催化性能。研究结果表明:各掺杂样品均为锐钛矿相结构,吸收均出现不同程度红移,禁带宽度变窄;Mn/Ti掺杂最佳摩尔比为0.10%,N/Ti掺杂最佳摩尔比为50%,各最优掺杂比例样品光催化性能从高到低为Mn-N-TiO_(2)-50,N-TiO_(2)-50,Mn-TiO_(2)-0.10和纯TiO_(2),12 h内的甲醛降解率分别为81.67%,72.02%,62.39%,46.78%,共掺杂样品的光催化性能优于单掺杂样品与纯TiO_(2)样品,表现出明显的协同作用;5次循环后,Mn-N-TiO_(2)-50的甲醛降解率仍有73.82%,表现出良好的稳定性。Manganese doped,nitrogen doped and manganese-nitrogen co-doped titanium dioxide photocatalysts were synthesized via a one-step hydrothermal method usingmanganese chloride tetrahydrate as the manganese source and urea as the nitrogen source.The photocatalysts were characterized by X-ray diffractometer,UV-visible diffuse reflectance spectrometer,transmission electron microscope and X-ray photoelectron spectroscopy.Employing a xenon lamp to simulate sunlight and gaseous formaldehyde as the target pollutant,the photocatalytic performance of each sample was evaluated.Results revealed that all doped TiO_(2) samples have an anatase phase structure.Additionally,the absorption of all doped samples showed varying degrees of redshift,accompanied by a narrowing of the band gap width.The optimal molar ratio of Mn/Ti doping was determined to be 0.10%,while the optimal molar ratio of N/Ti doping was 50%.Among samples with the optimal doping molar ratio,the order of photocatalysis performance from highest to lowest was Mn-N-TiO_(2)-50,N-TiO_(2)-50,Mn-TiO_(2)-0.10 and pure TiO_(2).Within 12 hours,the formaldehyde degradation rates for the former four catalysts were measrued as 81.67%,72.02%,62.39%and 46.78%,respectively.Notably,the photocatalytic performance of manganese and nitrogen codoped catalysts is significantly better than that of singly doped and pure titanium dioxide catalysts,indicating that a significant synergy effect.Furthermore,after five cycles,Mn-N-TiO_(2)-50 maintained the formaldehyde degradation rate of 73.82%,demonstrating excellent stability.

关 键 词：一步水热法 掺杂 TiO_(2) 光催化 甲醛降解 

分 类 号：TQ426[化学工程]