The adsorption feature and photocatalytic oxidation activity of K1?2xMxTiNbO5 (M = Mn,Ni) for methyl mercaptan in methane

The novel photocatalytic ceramics material K_1?2xM_xTiNbO₅ (M = Mn, Ni) were prepared through Mn²⁺ and Ni²⁺ ion-exchange of KTiNbO₅, which was synthesized by a hydrothermal method. The influence of the ion-exchange process on the structure and morphology of prepared ceramics material were investigated by such physicochemical methods as powder X-ray diffraction (XRD), scanning electron microscope (SEM), high-resolution transmission electron microscope (HRTEM), UV–visible diffuse reflectance spectroscopy (UV–vis DRS) and Fourier-transform infrared (FT-IR) microscopy. The adsorption and photocatalytic oxidation of methyl mercaptan (MM) in methane were used to evaluate the catalytic performance of different constitutes. The results revealed that K_1?2xNi_xTiNbO₅ exhibited better adsorption and photocatalytic oxidation activity for MM in methane under both visible and UV light radiation. While the photocatalytic oxidation activity of K_1?2xMn_xTiNbO₅ is similar to that of K_1?2xNi_xTiNbO₅, however it has little adsorption activity for MM in dynamic state.