La掺杂TiO2介孔微球的超声水热合成和光催化性能

doi:10.3724/SP.J.1077.2011.00739

无机材料学报 ›› 2011, Vol. 26 ›› Issue (7): 739-746.DOI: 10.3724/SP.J.1077.2011.00739

La掺杂TiO₂介孔微球的超声水热合成和光催化性能

刘国聪^1,3, 李海斌², 董辉¹

(1. 玉林师范学院新材料研发与化学生物传感技术所, 玉林 537000; 2. 长沙理工大学物理与电子技术学院, 长沙 410114; 3. 中南大学化学化工学院, 长沙 410082)

收稿日期:2010-09-10 修回日期:2010-11-27 出版日期:2011-07-20 网络出版日期:2011-06-20
作者简介:刘国聪(1969-), 男, 博士. 教授. E-mail: gcl_109@163.com
基金资助:
广西自然科学青年基金(2010GXNSFB013018, 2011GXNSFA018049); 广西高校优秀人才资助项目(G2009033, G2009045); 广西科学技术研究和开发项目(桂科攻10100003-2, 10124008-9); 国家自然科学基金(21061006)

Ultrasonic-hydrothermal Synthesis and Photocatalytic Activities of La-doped Mesoporous TiO₂ Microspheres

LIU Guo-Cong^{1, 3}, LI Hai-Bin², DONG Hui¹

(1. Institute of advanced materials & Chembiosensing Technology, Yulin Normal University, Yulin 537000, China; 2. Institute of Inorganic Materials, School of Physics and Electronics, Changsha University of Science and Tchnology, Changsha 410114, China; 3. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China)

Received:2010-09-10 Revised:2010-11-27 Published:2011-07-20 Online:2011-06-20
Supported by:
Natural Science Youth Foundation of Guangxi Province (2010GXNSFB013018, 2011GXNSFA018049); Excellent Talent Foundations of Guangxi High Education (G2009033, G2009045); Science and Technology Key Projects of Guangxi Province (10100003-2, 10124008-9); National Natural Science Foundation of China (21061006)

摘要/Abstract

摘要： 以钛酸四丁酯为钛源、硝酸镧为镧源、十二胺为模板剂, 采用超声-水热法合成了La³⁺掺杂介孔TiO₂微球, 并利用XRD、XPS、 TEM、 BET、UV-Vis、IR、FL等手段表征了材料的结构、形貌、比表面积、孔径分布及光学性能. 研究结果表明, 适量La³⁺离子掺杂不仅能使介孔TiO₂晶粒细化, 比表面积增大, 荧光强度减弱. La³⁺/TiO₂的光吸收边红移, 并具有比商业P25更好的光催化活性, 其中介孔La³⁺/TiO₂ (2.0at%)的比表面积和平均孔径分别为132.7 m²/g和8.67 nm, 光催化降解初始浓度为40 mg/L的亚甲基蓝溶液120 min时, 其降解率达到98.5%, 表现出最强的光降解能力.

关键词: 介孔TiO₂, 镧掺杂, 亚甲基蓝, 光催化剂

Abstract: With tetrabutyl orthotitanate (TBOT) as Ti source, La(NO₃)₃·6H₂O as La source and octadecylamine as a template, La-doped mesoporous TiO₂ microspheres were prepared by ultrasonic-hydrothermal method. The obtained samples were characterized by XRD, XPS, TEM, BET, UV-Vis, IR and FL.The results revealed that the appropriate molar fraction of La dopant could decrease crystalline size, increase specific surface area and weaken fluorescence intensity of mesoporous TiO₂. Compared with P25, the gap adsorption edge of mesoporous La³⁺/TiO₂ exhibited a little red shift and slightly narrowed their band gaps. For mesoporous La³⁺/TiO₂ (2.0 at%), the specific surface area and the average pore diameter were 132.7 m²/g and 8.67 nm, respectively. Furthermore, the degradation ratio of methylene blue to mesoporous La³⁺/TiO₂ (2.0at%) was up to 98.5%, which exhibited the best photocatalytic activity with the initial concentration of 40 mg/L for 120 min.

Key words: mesoporous TiO₂, La-doping, methylene blue, photocatalyst

中图分类号:

O614

刘国聪, 李海斌, 董辉. La掺杂TiO₂介孔微球的超声水热合成和光催化性能[J]. 无机材料学报, 2011, 26(7): 739-746.

LIU Guo-Cong, LI Hai-Bin, DONG Hui. Ultrasonic-hydrothermal Synthesis and Photocatalytic Activities of La-doped Mesoporous TiO₂ Microspheres[J]. Journal of Inorganic Materials, 2011, 26(7): 739-746.

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La掺杂TiO₂介孔微球的超声水热合成和光催化性能

Ultrasonic-hydrothermal Synthesis and Photocatalytic Activities of La-doped Mesoporous TiO₂ Microspheres

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