La/TiO_2制备及其光催化降解浮选药剂酯-105的研究  

Preparation of La / TiO_2 and Photocatalytic Degradation of Floatation Collector Ester-105

作　　者：罗仙平[1,2,3] 陈春飞[1,3] 梁任章 王俊蔚 王春英[1,2,3] 

机构地区：[1]江西理工大学资源与环境工程学院,江西赣州341000 [2]西部矿业股份有限公司,青海西宁810001 [3]江西省矿冶环境污染控制重点实验室,江西赣州341000

出　　处：《稀有金属》2015年第11期1010-1017,共8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(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(赣组字[2012]95号);江西省大学生创新创业教育计划项目(201410407022)资助

摘　　要：采用溶胶-凝胶法制备稀土元素La掺杂TiO_2(La/TiO_2)纳米光催化剂,通过X射线衍射(XRD)、紫外-可见漫反射(UV-Vis DRS)和低温N2物理吸附测试手段对其进行表征,并以浮选捕收剂酯-105为处理对象考察了溶液初始p H值、La掺杂比、煅烧温度、光照强度、催化剂用量以及催化剂重复利用对催化剂活性的影响。表征结果表明,La的掺杂能够抑制TiO_2的晶粒生长,增大其比表面积,扩大其对可见光的响应,从而提高其光催化活性;煅烧温度过高会因TiO_2发生烧结团聚而使其粒径增大、比表面积减小,从而影响其光催化活性。酯-105降解试验结果表明,初始p H为6.30(原溶液)、La掺杂比为0.50%、煅烧温度为450℃、光照为汞灯300 W、催化剂用量为0.3 g·L-1时,光催化活性最强,70 min后,酯-105降解率达99.59%;经验证,该催化剂重复使用4次后,酯-105降解率仍在99%以上,为La/TiO_2的工程实践应用提供了可能。The lanthanum-doped titanium dioxide （La/TiO2 ） nano-photocatalysts were prepared by sol-gel method and characterized by X-ray diffraction （XRD） , ultraviolet-visible diffusion reflection spectroscopy （UV-Vis DRS） and N2 physical adsorption at low tem- perature. Floatation collector ester-105 from benefieiation wastewater was taken as the research subject. The affecting factors of the initial pH value of reaction solution, La doping ratio, calcination temperature, light intensity, amount of catalyst and cyclic utilization of catalyst on photocatalytic activity of the material were investigated. Characterization results showed that the doping of La could inhibit the crystal growth of TiO2 , increase its specific surface area and expand its response to visible light, thus improving its photocatalytic activity. Results of ester-105 degradation tests indicated that the catalyst had the strongest photoeatalytic activity to ester-105 when initial pH value was 6.30, La doping ratio was 0.50% , calcination temperatures was 450 ℃, light was 300 W mercury lamp and catalyst dosage was 0.3 g·L- 1. After 70 min, the removal rate of ester-105 reached 99.59%. After 4 times of cyclic utilization, the removal rate of the ester-105 was still above 99%, which provided the potential possibility for application of photocatalyst in engineering.

关 键 词：TIO2 LA掺杂 表征 光催化活性 酯-105 

分 类 号：X703.1[环境科学与工程—环境工程]