Preparation Of N, Ag Modified TiO 2 / Ti Mesh And Its Photocatalytic Performance

The in-situ synthesis of semiconductor TiO₂ photocatalyst on Ti mesh can effectively overcome the defects of difficult recycle of traditional powder TiO₂. TiO₂/Ti mesh catalyst was prepared on Ti mesh precursor in this paper. Then the effects of pickling material and equiponderate Ti mesh and plate on the photocatalytic activities of TiO₂ was studied. The N-Ag/TiO₂/Ti mesh was obtained by codoping with nonmetal N and noble metal Ag. Moreover, the optical, photoelectric chemical and photoelectric catalytic performances of N-Ag/TiO₂/Ti mesh was systematic analysed.The in-situ synthesis of TiO₂ on Ti mesh was prepared by alkaline hydrothermal method. The influences of experiment parameters on the apparent morphology and photocatalytic degradation of methyl orange of TiO₂/Ti mesh were investigated. The results showed that the degradation rate of 5 mg/L of methyl orange was 89% by TiO₂/Ti mesh after 120 min under simulated sunlight irradiation. The effects of pickling by HCl, HNO₃ and H₃PO₄ on the element composition, crystallinity, visible absorption intensity and photoelectrochemical performance of TiO₂/Ti mesh. The results showed that N doped into the TiO₂ crystal lattice by pickling with HNO₃ and enhanced the crystallinity of TiO₂/Ti mesh. The TiO₂/Ti mesh sample pickling with HNO₃ had the minimum electrochemical impedance and the maximal optical current and open circuit voltage of 1.08 m A/cm2 and-0.22 V. What’s more, the degradation rate of 5 mg/L of methyl orange was 94% by TiO₂/Ti mesh washed by HNO₃.The N-Ag/TiO₂/Ti mesh photoelectrode was prepared by hydrothermal method and photodeposition method. The characterization analysis was investigated by EDX, XPS,SEM, XRD, UV-vis, FL and photoelectric chemical testing. The result showed that N-Ag/TiO₂/Ti mesh was composed of the mixed crystal structure of anatase and rutile.The doping with N and Ag led to light the red shifted of absorption edge and enhanced the production of hydroxyl radicals. The degradation rate of 10 mg/L norfloxacin was95% by N-Ag/TiO₂/Ti mesh. Compared with TiO₂/Ti mesh catalyst, the degradation rate enhanced 27%, illustrating that the doping of N and Ag is favarable to the efficiency of photogenerated electron-hole pairs and the utilization ratio of visible light.