层状铌酸盐M_xNb_6O_(17)(M=K,Fe,Ni)的合成及对甲硫醇的吸附与光催化性能研究  

Study on Synthesis of Lamellar Niobates M_xNb_6O_(17)(M=K,Fe,Ni) and Their Photocatalytic Activity for Methyl Mercaptan in Methane

作　　者：罗水源[1] 何杰[1] 赵俊斌[1] 

机构地区：[1]安徽理工大学化学工程学院,安徽淮南232001

出　　处：《广东化工》2009年第6期14-16,251,共4页Guangdong Chemical Industry

基　　金：安徽省自然科学基金(070414198);安徽省教育厅自然基金(KJ2008A121)

摘　　要：通过水热合成法合成了具有典型层状结构的K4Nb6O17,采用离子交换法制备了Ni2Nb6O17和Fe0.75Nb6O17。采用X-射线粉末衍射(XRD)、紫外-可见漫反射光谱(UV-vis-DRS)等技术对催化剂进行表征。通过红外光谱技术考察了催化剂对甲烷气中甲硫醇的吸附性能与光催化氧化性能。结果表明,K4Nb6O17及改性后的铌酸盐均具有很好的层状结构,改性后的铌酸盐对光谱的吸收由紫外光区向可见光区域移动,且吸收强度增加。在流动体系中对甲烷气中的甲硫醇具有吸附活性,在静态条件下经紫外光辐射对甲硫醇具有光催化氧化活性。The photocatalysts were prepared by modifying Potassium Niobate （K4Nb6O17）, which was prepared by hydrothermal method, through Ni2. and Fe3＋ ion-exchange respectively. The catalysts were characterized by means of powder X - ray diffraction （XRD） and U~ - visible diffuse reflectance spectroscopy （UV-vis-DRS）. The adsorption feature and photocatalytic oxidation activity for methyl mercaptan in methane were evaluated through infrared spectroscopy technique. The results revealed that the as-prepared photocatalysts remain layer structure and the energy of band gap decreased when Potassium ion was exchanged by Ferric ion or Nickel ion. Methyl mercaptan in methane was adsorbed on the as-prepared catalysts and could be oxidated through natural light or UV-light irradiation.

关 键 词：层状化合物 离子交换 甲硫醇 吸附 光催化氧化 

分 类 号：TQ424.1[化学工程] TB383[一般工业技术—材料科学与工程]