sol-gel法制备CeO2-TiO2/凹凸棒石复合材料的催化性能

doi:10.3969/j.issn.0438-1157.2013.07.050

化工学报 ›› 2013, Vol. 64 ›› Issue (7): 2679-2686.DOI: 10.3969/j.issn.0438-1157.2013.07.050

• 材料化学工程与纳米技术 • 上一篇下一篇

sol-gel法制备CeO₂-TiO₂/凹凸棒石复合材料的催化性能

孟英芹, 赵晓兵, 李霞章

常州大学材料科学与工程学院, 江苏常州 213164

收稿日期:2012-11-21 修回日期:2013-03-05 出版日期:2013-07-05 发布日期:2013-07-05
通讯作者: 赵晓兵
作者简介:孟英芹(1987- ),女,硕士研究生。
基金资助:
国家自然科学基金项目(51002016);常州市应用基础研究计划项目(CJ20115021);江苏省高校中青年骨干教师及校长境外研修计划项目。

Catalytic properties of CeO₂-TiO₂/attapulgite nanocomposites prepared by sol-gel method

MENG Yingqin, ZHAO Xiaobing, LI Xiazhang

School of Materials Science and Engineering, Changzhou University, Changzhou 213164, Jiangsu, China

Received:2012-11-21 Revised:2013-03-05 Online:2013-07-05 Published:2013-07-05
Supported by:
supported by the National Natural Science Foundation of China (51002016),the Applied Basic Research Projects of Changzhou (CJ20115020),the Overseas Research & Training Program for University Prominent Young and Middle-aged Teachers and Presidents of Jiangsu Province.

摘要/Abstract

摘要： 以凹凸棒石(ATP)为载体,Ce(NO₃)₃·6H₂O和Ti(OBu)₄为原料,冰醋酸为抑制剂,采用溶胶-凝胶法制备CeO₂-TiO₂/ATP纳米复合材料。利用TG-DSC、TEM、XRD和N₂吸附/脱附仪对复合材料进行表征,考察铈钛摩尔比对所制备样品催化降解罗丹明B溶液性能的影响。结果表明,当Ce/Ti≥5/5时,具有立方萤石结构的氧化物颗粒以固溶体形式均匀分布在ATP表面,颗粒尺寸约5~10 nm;随Ti⁴⁺的进一步增加,样品中的CeO₂结晶不完全;当Ce/Ti<3/7时,样品中出现锐钛矿型TiO₂的分离相。适量的Ti⁴⁺掺杂能促进CeO₂产生较多的结构缺陷,有利于增加晶格氧空位的浓度,提高样品的催化活性。对罗丹明B的催化降解实验表明,当Ce/Ti=5/5时,样品的催化性能较好,对罗丹明B溶液的化学需氧量(COD)去除率可达96%以上。

关键词: 凹凸棒石, CeO₂-TiO₂, 催化性能

Abstract: CeO₂-TiO₂/attapulgite (ATP)nanocomposites were prepared by the sol-gel method using ATP as support,cerium nitrate hexahydrate and tetrabutyl titanate as raw materials,glacial acetic acid as complexing agent.The microstructures of the as-prepared composites were characterized by thermogravimetric-differential scanning caloricity (TG-DSC)analysis,transmission electron microscopy (TEM),X-ray diffraction (XRD),and nitrogen adsorption-desorption measurements.The effects of Ce/Ti molar ratio on catalytic properties of the as-prepared composites for decomposing Rhodamine B solutions were investigated.The results indicated that when Ce/Ti was more than or equal to 5/5,CeO₂-TiO₂ solid solution oxide particles with cubic fluorite structure were uniformly coated on the surface of ATP with particle size of 5—10 nm.With the increase of Ti⁴⁺ content,CeO₂ nanoparticles tended to form a defective crystalline phase and existed as amorphous phase.When Ce/Ti was less than 3/7,a separated anatase TiO₂ was observed in the composites.A suitable amount of Ti⁴⁺ doping could promote the formation of structure defects,which contributed to increasing the content of oxygen vacancies and improving the catalytic activity.The catalytic efficiency of CeO₂-TiO₂/ATP (Ce/Ti=5/5)nanocomposite on Rhodamine B solution was higher than that of others,and the removal rate of chemical oxygen demand (COD)could reach over 96%.

Key words: attapulgite, CeO₂-TiO₂, catalytic property

中图分类号:

TB332
TB383

孟英芹, 赵晓兵, 李霞章. sol-gel法制备CeO₂-TiO₂/凹凸棒石复合材料的催化性能[J]. 化工学报, 2013, 64(7): 2679-2686.

MENG Yingqin, ZHAO Xiaobing, LI Xiazhang. Catalytic properties of CeO₂-TiO₂/attapulgite nanocomposites prepared by sol-gel method[J]. CIESC Journal, 2013, 64(7): 2679-2686.

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sol-gel法制备CeO₂-TiO₂/凹凸棒石复合材料的催化性能

Catalytic properties of CeO₂-TiO₂/attapulgite nanocomposites prepared by sol-gel method

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