二甲基硫和乙硫醇在层状K1-2xMxTiNbO5(M=Mn2+、Ni2+)上的吸附与光催化氧化作用

采用固相法制备出具有层状结构的KTiNbO₅，通过离子交换制备K_1-2xM_xTiNbO₅(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3.35eV相应地移至2.97eV和2.45eV。K_1-2xM_xTiNbO₅对DMS和EM的吸附作用力较弱，不受阳离子影响。K_1-2xMn_xTiNbO₅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K_1-2xNi_xTiNbO₅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。

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

Layered K1-2xMxTiNbO5(M = Mn,Ni) was prepared by ion-exchange of KTiNbO5 obtained by the solid-state method with Mn2+ and Ni2+.The crystal structure and optical property of the as-prepared K1-2xMxTiNbO5 were studied by using powder X-ray diffraction and ultraviolet(UV)-visible light diffuse reflection spectroscopy.The adsorption feature and photocatalytic oxidation activity of dimethyl sulfide(DMS) and ethyl mercaptan(EM) over the as-prepared K1-2xMxTiNbO5 were evaluated using infrared spectroscopy.K1-2xMxT...