Study On Synthesis Of CNTs-Ag₃PO₄Photocatalysts And The Photocatalytic Activity Of CNTs-Ag₃PO₄under Visible Light Irradiation

Photocatalytic technology is an ideal environment treatment technology, which can make full use of the sunlight. It has many superiorities, such as low cost and non-pollution. In order to utilize solar energy, it is meaningful to find and research those photocatalysts which have high photocatalytic activity under visible-light.The visible-light photocatalyst CNTs-Ag3PO4has been successfully synthesized by CNTs, AgN03and NaaPO·12H2O through a simple hydrothermal process. The prepared photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-visible diffuse reflectance spectroscopy (UV-vis DRS) and Brunauer-Emmet-Teller (BET) surface area analysis. The effects of pH value of hydrothermal precursor, hydrothermal temperature and hydrothermal holding time on the photocatalytic activities of the CNTs-Ag3PO4were investigated by the degradation of Methyl Orange solution under visible-light irradiation. It found that pH value of hydrothermal precursor, hydrothermal temperature and hydrothermal holding time could affect the photocatalytic activity of the CNTs-Ag3PO4photocatalysts. CNTs-Ag3PO4which was synthesized at160℃and pH3.68for8h showed the highest photocatalytic activity.Photocatalytic degradations of Methyl Orange and p-Nitrophenol were performed to investigate the influence of different conditions. The results showed that: The optimum composite dosage was2.0g/L when the initial strength of Methyl Orange aqueous was50mg/L, the decolorization ratio was97%. The optimum composite dosage was3.0g/L when the initial concentration of p-Nitrophenol aqueous solution was100mg/L, the decolorization ratio was88%. The reuse experients indicated that the structure of CNTs-Ag3PO4composite photocatalysts was stable after being used for five times. CNTs-Ag3PO4displayed high photocatalytic activity.