MxTiNbO5对甲烷中甲硫醇吸附与光催化性能研究

采用水热法合成层状KTiNbO5，通过离子交换获得Mn0.5TiNbO5和Ni0.5TiNbO5。利用X-射线衍射（XRD）、紫外-可见漫反射光谱（UV—vis-DRS）、扫描电镜（SEM）、高分辨透射电镜（HRTEM）等对催化剂进行表征。采用红外光谱技术考察了催化剂对甲烷气中甲硫醇吸附与光催化氧化性能。结果表明：在相同层板组成下，层间金属离子不同，对光谱的响应及对有机硫化物的吸附与光催化氧化能力不同。经Mn^2＋和Ni^2＋对KTiNbO5离子交换后，对光谱吸收由紫外区移向可见光区;动态条件下，KTiNbO5和Mn0.5TiNbO5虽对甲烷气中的甲硫醇吸附很弱，但Mn0.15TiNbO5在自然光与紫外光下对硫醇有催化氧化活性;而Ni0．5TiNbO5对甲烷气中的甲硫醇不仅具有良好的吸附活性，且在自然光与紫外光辐射下均显示了良好的光催化氧化活性。

MxTiNbO5 Adsorption and Photocatalytic Capability for Methyl Mercaptan in Methane

Layered catalysts M0.5TiNbO5 （M = Mn, Ni） were prepared through Mn^2＋ and Ni^2＋ ion-exchange of KTiNbO5, which was synthesized by the hydrothermal synthesis. The catalysts were characterized by means of powder X-ray diffraction （XRD）,UV-visible diffuse reflectance spectroscopy （UV- vis-DRS）, Scanning electron microscope （SEM） , High resolution transmission electron microscope （HRTEM）. The adsorption feature and photocatalytic oxidation activity for mercaptan in methane over the as-prepared catalysts were evaluated through infrared spectroscopy techniques. With different cations into the interlayer, the catalysts have different spectral response characteristics, adsorption performance and photocatalytic oxidation activity for mercaptan in methane. After ion-exchange with Mn^2＋ and Ni^2＋, spectral response was shifted from ultraviolet to visible region. In dynamic state, both KTiNbO5 and Mn0.5TiNbO5 have little adsorption activity for mercaptan, however, Mn0.5TiNbO5 has photocatalytic oxidation activity for mercaptan under visible or UV light irradiation. Not only the Ni0.5TiNbO5 emerged well adsorption activity hut also photocatalytic oxidation activity for mercaptan in methane radiated under visible or UV light.