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Gd掺杂锐钛矿型TiO2光催化剂的制备及降解苯甲羟肟酸活性
作者:祝思频1 2 王春英1 2 3 王俊蔚1 2 罗仙平1 2 3 
单位:1. 江西理工大学资源与环境工程学院 江西 赣州 341000 2. 江西省矿冶环境污染控制重点实验室 江西 赣州 341000 3. 西部矿业股份有限公司博士后科研工作站 西宁 810000 
关键词:二氧化钛 光催化剂 掺杂改性 钆掺杂 苯甲羟肟酸 
分类号:X703.1
出版年,卷(期):页码:2017,45(10):1495-1502
DOI:10.14062/j.issn.0454-5648.2017.10.16
摘要:

 以溶胶?凝胶法制备了不同煅烧温度及不同Gd掺杂量的TiO2(TiO2:x%Gd)粉末。对改性前后TiO2结构和性能进行了表征,研究了Gd掺杂TiO2粉末在紫外光下对苯甲羟肟酸的光催化性能。结果表明:相比纯TiO2,适量Gd掺杂使TiO2的光吸收强度增大、粒径减小且比表面积增大。掺杂后的TiO2粉末具有很高的光催化活性,500 ℃煅烧的TiO2:0.70%Gd催化剂光催化活性最佳,室温下300 W汞灯照射120 min后,对苯甲羟肟酸的降解率高达94.7%。总有机碳(TOC)测试显示,加入TiO2:0.70%Gd后,苯甲羟肟酸矿化率达79.3%,苯甲羟肟酸降解后可能转化为有机小分子物质及无机CO2和NO3−等。此外,Gd掺杂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,表明稀土Gd掺杂TiO2是一种有效稳定的光催化剂。

 

 TiO2:x%Gd powder with different doping Gd amounts were prepared by a sol−gel method at different calcination temperatures. The structure and physicochemical properties were characterized. As a typical beneficiation reagent, benzohydroxamic acid was used to examine the photodegradation activity of Gd-doped TiO2. The results indicate that the Gd-doped TiO2 possesses a greater light absorption intensity, smaller particle size and larger specific surface area, compared to pure TiO2. TiO2:0.70%Gd powder calcined at 500 ℃ shows the highest photocatalytic activity to benzohydroxamic acid. After 120 min irradiation under 300 W mercury lamps at room temperature, the removal efficiency and the total organic carbon (TOC) removal rate are 94.7% and 79.4% respectively. It is indicated that most of the benzohydroxamic acid could transform into small molecule organic substances and inorganic materials CO2 and NO3?, based on the analysis of TOC instrument and ion chromatography. In addition, the TiO2:0.70%Gd still has a great photocatalytic activity for the photodegradation of benzohydroxamic acid after 4-times recycling, showing the stability of Gd-doped TiO2.

 
基金项目:
“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(NCET-10-0183);国家自然基金项目(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(2015M582776XE,2016T90967);江西理工大学清江青年英才支持项目。
作者简介:
祝思频(1992—),女,硕士研究生。
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