摘要
通过溶胶-凝胶法制备Ce改性TiO2(Ce/TiO2)复合材料,并以选矿废水中残余的浮选捕收剂苯甲羟肟酸为对象来考察Ce/TiO2的光催化降解活性;通过多种分析检测手段(X射线衍射(XRD)、X射线光电子能谱(XPS)、扫描电镜(SEM)、紫外-可见漫反射(UV-Vis DRS)等)对所合成催化剂的结构、形貌、光吸收等物理化学性能进行一系列表征。表征结果表明:相较于纯TiO2,Ce的掺杂可以有效抑制TiO2晶粒的生长,增大改性后Ce/TiO2的比表面积,从而提高其光催化活性;当掺杂量为0.20%时,其结晶度好、颗粒较均匀、具有较强的光吸收性能。苯甲羟肟酸的降解试验结果表明:当Ce的掺杂比为0.20%、煅烧温度为500℃,光催化活性最强,120 min后,苯甲羟肟酸降解率达90.98%(0.3 g·L^-1的Ce/TiO2),矿化率达82.8%。此外,Ce/TiO2重复使用4次后,苯甲羟肟酸的光催化降解率无明显降低,表明Ce/TiO2是一种有效稳定的光催化剂。
Rare earth element Ce doped TiO2(Ce/TiO2) was synthesized by sol-gel method.Benzohydroxamic acid was used as the objective pollutant to investigate the photocatalytic activity of Ce/TiO2.The structure and physicochemical properties of prepared materials were characterized by X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),scanning electron microscopy(SEM),ultraviolet-visible diffuse reflectance spectroscopy(UV-Vis DRS),and so on.As a result,the doping of Ce could inhibit the crystal growth of TiO2,retain a smaller grain size,increase its specific surface area,and improve the photocatalytic activity of Ce/TiO2.The crystallinity was good when the doping ratio of Ce to TiO2 was 0.20%.The prepared Ce/TiO2 particles were more uniform,and of stronger optical absorption properties.Ce/TiO2 with the doping ratio of 0.20% calcined at 500 ℃ showed the highest photocatalytic activity to degrade benzohydroxamic acid.After 120 min,the removal rate of benzohydroxamic acid reached 90.98%(0.3 g·L^-1 of Ce/TiO2),and 82.8% of the total organic carbon was eliminated.In addition,after four recycling runs,Ce/TiO2(0.20%) still kept high photocatalytic activity on the photodegradation of benzohydroxamic acid.
作者
王俊蔚
王春英
祝思频
罗仙平
李智慧
徐亮亮
Wang Junyu;Wang Chunying;Zhu Sipin;Luo Xianping;Li Zhihui;Xu Liangliang(Jiangxi Key Laboratory of Mining & Metallurgy Environmental Pollution Control, Faculty of Resource and Envi- ronmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China;Post-Doctoral Scientific Research Workstation of Western Mining Co., Ltd., Xining 810000, China)
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2018年第4期393-401,共9页
Chinese Journal of Rare Metals
基金
国家科技部“十二五”国家科技支撑计划项目(2012BAC11B07)
教育部新世纪优秀人才支持计划项目(NCET-10-0183)
国家自然科学基金项目(51408277)
江西省主要学科与技术带头人培养对象计划项目(2010DD01200)
“赣鄱英才555工程”领军人才培养计划项目
中国博士后科学基金项目(2015M582776XE,2016T90967)资助