二甲基硫和乙硫醇在层状K_(1-2x)M_xTiNbO_5(M=Mn^(2+)、Ni^(2+))上的吸附与光催化氧化作用  

Adsorption and photocatalytic oxidation of dimethyl sulfide and ethyl mercaptan over layered K_(1-2x)Mn_xTiNbO_5 and K_(1-2x)Ni_xTiNbO_5

作　　者：何杰[1] 赵俊斌[1] 兰允祥[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：《燃料化学学报》2009年第4期485-488,共4页Journal of Fuel Chemistry and Technology

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：采用固相法制备出具有层状结构的KTiNbO5,通过离子交换制备K1-2xMxTiNbO5(M=Mn2+、Ni2+)。采用X射线粉末衍射(XRD)和紫外-可见漫反射光谱技术对样品晶体结构与光谱响应特征进行表征,采用红外光谱方法考察样品对二甲基硫(DMS)和乙硫醇(EM)吸附与光催化氧化行为。结果表明,采用Mn2+和Ni2+对KTiNbO5离子交换后,层板间距增加,对光谱吸收由紫外区移向可见光区,带隙能量由3.35 eV相应地移至2.97 eV和2.45 eV。K1-2xMxTiNbO5对DMS和EM的吸附作用力较弱,不受阳离子影响。K1-2xMnxTiNbO5只在紫外光辐射下呈现催化活性,并将硫醚、硫醇氧化为亚砜、砜和磺酸;而K1-2xNixTiNbO5在可见与紫外光辐射下均具有光催化活性,在可见光辐射下,乙硫醇被氧化至磺酸,而在紫外光辐射下硫醇被矿化并产生硫酸盐与碳酸盐。Layered K1-2xMxTiNbO5 （M = solid-state method with Mn^2＋ and Ni^2＋. MxTiNbO5 were studied by using powder spectroscopy. The adsorption feature and Mn, Ni） was prepared by ion-exchange of KTiNbO5 obtained by the The crystal structure and optical property of the as-prepared K1-2x X-ray diffraction and ultraviolet （UV）-visible light diffuse reflection photocatalytic oxidation activity of dimethyl sulfide （DMS） and ethyl mercaptan （EM） over the as-prepared K1- 2x MxTiNbO5 were evaluated using infrared spectroscopy. K1-2x MxTiNbO5 showed a higher interval between sheets and a stronger absorbance to visible light than KTiNbO5. After ionexchange with Mn^2＋ and Ni^2＋ , the band-gap energy of KTiNbO5 was shifted from 3.35 eV to 2.97 eV and 2.45 eV, respectively, whereas the weak interaction between K1-2xMxTiNbO5 and DMS/EM was little affected by the exchanged cation. The photocatalytic oxidation activity of K1-2x MxTiNbO5 for DMS or EM depended on the special cation. K1-2x MnxTiNbO5 emerged a photocatalytic activity only under ultra-light irradiation, which converted DMS to sulfoxide and sulfone, and EM to sulfonic acid. However, K1-2x NixTiNbO5 emerged the photocatalytic activity under visible light besides under ultra-light irradiation; EM was converted to sulfonic acid by visible irradiation, but to sulfate and carbonate by UV radiation.

关 键 词：层状钛铌酸盐 二甲基硫 乙硫醇 吸附 光催化 

分 类 号：O643.36[理学—物理化学]