物理化学学报 >> 2010, Vol. 26 >> Issue (05): 1323-1329.doi: 10.3866/PKU.WHXB20100511

催化和表面结构 上一篇    下一篇

纳米复合材料Ag/TiO2-ZrO2的制备及其微波增强光催化降解甲基橙

李莉, 陆丹, 计远, 赵月红   

  1. 齐齐哈尔大学化学与化学工程学院, 黑龙江 齐齐哈尔 161006
  • 收稿日期:2009-09-30 修回日期:2009-12-17 发布日期:2010-04-29
  • 通讯作者: 李莉 E-mail:qqhrll@163.com

Preparation of Nanocomposite Ag/TiO2-ZrO2 and the Microwave Enhanced Photocatalytic Degradation of Methyl Orange

LI Li, LU Dan, JI Yuan, ZHAO Yue-Hong   

  1. Faculty of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar 161006, Heilongjiang Province, P. R. China
  • Received:2009-09-30 Revised:2009-12-17 Published:2010-04-29
  • Contact: LI Li E-mail:qqhrll@163.com

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摘要：

采用EO20PO70EO20 (P123)作模板剂, 通过溶胶-凝胶-程序升温溶剂热一步法, 并经萃取处理制备了具有光催化活性的纳米复合材料Ag/TiO2-ZrO2. 用X射线衍射(XRD)、X射线光电子能谱(XPS)、透射电子显微镜(TEM)、N2吸附-脱附测定和扫描电子显微镜配合X射线能量色谱仪(SEM-EDS)等测试手段对其组成、结构及形貌等进行了表征. 结果表明, 复合材料Ag/TiO2-ZrO2中Ag以单质形式存在, 材料具有双孔结构, 颗粒分布较均匀, 结构也较规整, 平均孔径约为3.6和9.0 nm. 通过微波增强光催化降解染料甲基橙的实验, 对复合材料Ag/TiO2-ZrO2的光催化活性进行了探究. 实验结果表明, 微波辅助光催化效果优于紫外辐射, 并且萃取后的合成产物Ag/TiO2-ZrO2在90 min内对甲基橙的降解率可达81.5%, 其活性高于市售P25以及TiO2-ZrO2.

关键词: 溶胶-凝胶, Ag/TiO2-ZrO2, 光催化, 微波, 甲基橙

Abstract:

The nanocomposite Ag/TiO2-ZrO2 possessing high photocatalytic activity was prepared by the sol-gel method combined with temperature-programmed treatment in the presence of the triblock copolymer surfactant EO20PO70EO20 (P123) followed by extraction. The phase composition, structures and morphologies of the nanocomposite Ag/TiO2-ZrO2 were well-characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), N2 adsorption-desorption tests and scanning electron microscopy assisted X-ray energy dispersive spectroscopy (SEM-EDS). Results showed that the silver species in the nanocomposite Ag/TiO2-ZrO2 was metallic Ag0. Moreover, the composite had bimodal pore systems, an orderly distribution of particles and good structure. The average pore diameter was ca 3.6 and 9.0 nm. The microwave assisted photocatalytic degradation of methyl orange on Ag/TiO2-ZrO2 in an aqueous solution was carried out to investigate the catalytic activity. After extraction, the photocatalytic activity under microwave irradiation was found to be more efficient than that under UV irradiation and methyl orange degraded by 81.5% within 90 min. This degradation behavior was better than that of Degussa P25 and TiO2-ZrO2.

Key words: Sol-gel, Ag/TiO2-ZrO2, Photocatalysis, Microwave, Methyl orange

MSC2000: 

  • O643