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Ag-TiO2/KIT-6复合纳米光催化剂的研究

Studies on Ag-TiO2/KIT-6 Composite Nanosized Photocatalyst

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【作者】 张凤利郑远辉詹瑛瑛林性贻张汉辉郑起

【Author】 ZHANG Feng-li1,ZHENG Yuan-hui1,ZHAN Ying-ying1,LIN Xing-yi1,ZHANG Han-hui2,ZHENG Qi11. National Engineering Research Center of Chemical Fertilizer Catalyst,Fuzhou University,Fuzhou 350002,China2. Department of Chemistry,Fuzhou University,Fuzhou 350002,China

【机构】 福州大学化肥催化剂国家工程研究中心福州大学化学系

【摘要】 以有序介孔SiO2(简称KIT-6)为载体,采用钛酸丁酯水解法将纳米TiO2与KIT-6复合,并通过沉积沉淀法将纳米Ag粒子负载于其上,首次制得Ag-TiO2/KIT-6复合光催化剂,并采用相同的方法制备了一系列相关的催化剂。以光催化降解甲基橙来评价其催化性能,光催化活性顺序为Ag-TiO2/KIT-6>Ag/TiO2>TiO2/KIT-6>TiO2>Ag/KIT-6。利用XRD、N2物理吸附、XPS、UV-Vis DRS和TEM对系列催化剂进行表征,结果表明Ag-TiO2之间形成的异质结和催化剂的大比表面积是Ag-TiO2/KIT-6具有最高光催化活性的重要原因。其中Ag-TiO2之间的异质结结构,有效抑制了光生电子和光生空穴在TiO2表面和体相内部的复合,提高了光催化活性;此外Ag-TiO2/KIT-6的大比表面积大大提高了催化剂的吸附能力,增加了催化剂与污染物的接触,达到快速光催化降解污染物的目的。

【Abstract】 In the present paper,ordered mesoporous silica (KIT-6) as support,nanosized TiO2 into KIT-6 was synthesized by titanium tetraisopropoxide hydrolysis. Then silver was loaded by deposition-precipitation method. Ag-TiO2/KIT-6 composite nanosized photocatalyst was firstly synthesized and a series of correlated catalysts were synthesized by the same preparation method. Methyl orange is presently adopted as a representative organic pollutant to evaluate the photocatalytic performance of the as-synthesized catalysts. The order of photocatalytic activity of the as-synthesized samples was found as Ag-TiO2/KIT-6>Ag/TiO2>TiO2/KIT-6>TiO2>Ag/KIT-6. Detailed characterizations were conducted by techniques including XRD,N2 physical adsorption,XPS,UV-Vis DRS and TEM. It was found that the Ag-TiO2/KIT-6 sample shows the highest photocatalytic activity,which should be attributed to the Ag-TiO2 heterojunction structure and higher BET surface area of the Ag-TiO2/KIT-6 sample. Ag-TiO2 heterojunction improves the separation of photogenerated electron-hole pairs,thus enhancing the photocatalytic activity;Ag-TiO2/KIT-6 sample possesses high BET surface area,which facilitates adsorption and transportation of dye molecules,also leading to higher photocatalytic activity.

【关键词】 XPSUV-Vis DRS异质结Ag-TiO2/KIT-6催化剂
【Key words】 XPSUV-Vis DRSHeterostructureAg-TiO2/KIT-6 catalyst
【基金】 国家自然科学基金项目(20771025);福建省重大专项项目(2005H201-2)资助
  • 【文献出处】 光谱学与光谱分析 ,Spectroscopy and Spectral Analysis , 编辑部邮箱 ,2009年08期
  • 【分类号】O643.36
  • 【被引频次】11
  • 【下载频次】567
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