以水热炭为模板制备TiO_2光催化剂及其光催化性能研究  

Synthesis and Photocatalytic Property of TiO_2 Photocatalysts Using Hydrochars as Template

作　　者：王晓静 张启明 刘阳生[1] WANG Xiaojing;ZHANG Qiming;LIU Yangsheng(College of Environmental Sciences and Engineering,Peking University,Beijing 100871)

机构地区：[1]北京大学环境科学与工程学院,北京100871

出　　处：《北京大学学报（自然科学版）》2018年第6期1332-1338,共7页Acta Scientiarum Naturalium Universitatis Pekinensis

基　　金：深圳市科创委学科布局基础研究项目(JCYJ20160330095359100)资助

摘　　要：以水热炭为模板,采用溶胶–凝胶法制备TiO_2光催化剂,并采用X射线衍射(XRD)、傅里叶红外光谱(FTIR)、扫描电子显微镜(SEM)和BET比表面积测定等方法,对催化剂的物相、组成、形貌和比表面积等进行表征。通过光催化降解甲基橙溶液,评价样品的光催化性能。研究结果表明:与TiO_2相比,以水热炭为模板制备的HTC-TiO_2具有更高的热稳定性,在煅烧温度较高时仍保持锐钛矿型。HTC-TiO_2具有水热炭的片状结构特征,TiO_2颗粒在HTC表面分散较好,晶体粒径更小,比表面积增加,从而提高其光催化活性。当煅烧温度为450oC时,以水热炭为模板制备的HTC-TiO_2对甲基橙的降解率在550 W碘钨灯光照2小时后达到40.6%,光催化效率比TiO_2 (16.2%)提高1.5倍。Using hydrochars as template,TiO2 photocatalysts were prepared by the sol-gel method.The samples were characterized with X-ray diffraction(XRD),Fourier infrared spectrum(FT-IR),scanning electron microscope(SEM)and BET specific surface area measurement.The photocatalytic activity was investigated by degradation of methyl orange(MO)as target pollutant in the solution.The results showed that HTC-TiO2 remained anatase type at high calcination temperature due to the higher thermal stability than TiO2.The TiO2 particles were almost uniformly dispersed on the surface of HTC.HTC-TiO2 had smaller crystal sizes,bigger specific surface area and the flake structure,which had the same structure character as the hydrochars micro-structure and was beneficial to improve the photocatalytic activity.The degradation rate of MO under 550 W iodine-tungsten lamp illumination for 2 hours was 40.6%in presence of HTC-TiO2 calcined at 450oC,which increased by 1.5 times more than those in presence of TiO2(16.2%).

关 键 词：水热炭 TiO2 溶胶–凝胶法 甲基橙 光催化 

分 类 号：X705[环境科学与工程—环境工程]