磁性SiO_2载体的表面改性与纳米TiO_2光催化剂的固载(英文)  

Surface Modification of a Magnetic SiO_2 Support and Immobilization of a Nano-TiO_2 Photocatalyst on It

作　　者：王丽燕[1] 王红霞[2] 王爱杰[1] 刘敏[2] 

机构地区：[1]哈尔滨工业大学城市水资源与水环境国家重点实验室,黑龙江哈尔滨150001 [2]哈尔滨师范大学先进功能材料与激发态省重点实验室,黑龙江哈尔滨150025

出　　处：《催化学报》2009年第9期939-944,共6页

基　　金：Supported by the State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (SKLUWRE, HIT) (2008DX01-01 and 2008QN03);Foundation for University Key Teacher by the Education Office of Heilongjiang Province (1152G018);Youth Foundation of Heilongjiang Province (QC07C20);Harbin Youth Foundation (2007RFQXG060)

摘　　要：以Fe3O4纳米粒子为磁响应成分,制备了SiO2/Fe3O4磁性载体,采用回流热处理的方式对载体进行了表面改性.利用傅里叶变换红外和X-射线光电子能谱等手段对改性前后的载体进行分析.结果表明,载体改性后表面的Si–O–Si键数量明显减少,Si–OH的数量有所增加.以TiO2为探针催化剂,Procion染料为探针分子,考察了载体的表面改性对催化剂固载量和光降解催化活性的影响,结果表明,改性后的载体明显提高了TiO2催化剂的固载量和降解Procion的催化活性.This study presented an effective method to modify the surface chemical reactivity of a SiO2/Fe3O4 support. The unmodified SiO2/Fe3O4 support was prepared by the hydrolysis and condensation of tetraethoxysilane on the surface of hydrophilic Fe3O4 nanoparticles. These were then modified by a heat treatment in an ethanol/water solution under reflux. The resulting samples were characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and transmission/scanning electron microscopy. The immobilization of a TiO2 nanocatalyst on both unmodified and modified supports was performed to investigate the effects of the modification of the magnetic silica support on the loading of a TiO2 nanocatalyst and the photocatalytic activity. The loading of TiO2 and the photocatalytic activity were both improved.

关 键 词：二氧化硅 四氧化三铁 回流 表面改性 表面化学活性 

分 类 号：O643.36[理学—物理化学]