Preparation,Characterization And Activity Evaluation Of Narrow Band Photocatalyst

A narrow band photocatalyst AgIn(WO₄)₂ was prepared by coprecipitation method with AgNO₃, In (NO₃)3 and Na₂WO₄ as raw materials. AgIn(WO₄)₂ was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and UV-visible diffuse reflectance spectroscopy (DRS). The photocatalytic activity evaluation was the Cr2_O72- and nitrobenzene of photocatalytic reduction. The results show that the photocatalytic activity of the AgIn(WO₄)₂ calcinated at 550°C for 5h is higher than the other samples.A narrow-band photocatalyst Ag₂Mo₄O₁₃ was prepared by hydrothermal method, AgNO₃ and (NH₄)₂MoO4 as a raw materials. Ag₂Mo₄O₁₃ nature of the structural and optical activity of X-ray diffraction (XRD), scanning electron microscopy (SEM), and UV-visible diffuse reflectance spectroscopy (DRS), nitrogen adsorption and specific surface area (BET), the use of terephthalic acid as a probe molecule Fluorescence detection of the catalyst after UV irradiation surface of the hydroxyl radical (?OH) to characterize the (TA-PL) to characterize. The evaluation of photocatalytic activity was carried out by the photo-oxidation of methyl orange (MO) and the photo-reduction of nitrobenzene. The results show that the photocatalytic activity of Ag₂Mo₄O₁₃ prepared at 450°C for 10h is higher than the other samples.The precursor of CaZrTi2O7 was prepared by the polymerized complex method, following the photocatalyst CaZrTi2O7 was heated at different temperatures for 10 h, and the best samples will continue to heat treatment 800°C for 8h, 12h and 14h, respectively. The CaZrTi2O7 photocatalyst was characterized by scanning electron microscopy (SEM), X-ray diffraction analysis (XRD), ultraviolet diffuse reflectance spectroscopy (DRS) and fluorescence (PL) and terephthalic acid probe (TA-PL). The photocatalytic activity evaluation was the photoreduction Cr2_O72-, nitrobenzene and photo-oxidation of methyl orange. The effect of the heat treatment conditions on the photocatalytic axtivity was further studied. The mechanism of photocatalytic performance was calculated by using density functional theory and discussed.ZnS-CuS nanoparticles were prepared by a coprecipitation method and Ce2S3-ZnS-CuS nanoparticles were prepared by ball milling. The photocatalysts were characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and terephthalic acid photoluminescence probing technique (TA-PL). The photocatalytic applications were evaluated by the photocatalytic reduction of Cr2_O72-, nitrobenzene and photocatalytic oxidation of methyl orange (MO). The different preparation conditions on the photocatalytic activity of the photocatalyst were investigated. The mechanisms of influence on the photocatalytic activity were also studied.