The Preparation And Properties Of Polyaniline Photocatalytic Composites

The formation of p-n junction between polyaniline and n-type semiconductor photocatalyst can improve the photocatalytic properties of the photocatalyst.In this paper,polyaniline nanofibers,BiPO₄,BiVO₄ were respectively prepared by direct mixing method and hydrothermal method.Different composite materials were prepared by different order.The crystal structure,morphology and optical properties of the materials were characterized by XRD,SEM and UV-Vis spectrophotometer.The effects of preparation conditions and order were explored,and adsorption property of PANI on dyeing was analyzed.The main results are as follows:?1?BiPO₄/PANI was prepared by polymerization ANI in the presence of BiPO₄.The photocatalytic degradation rate reaches the maximum 83.3%,at PANI 0.5wt%doped by H2SO4,while the degradation rate of pure BiPO₄ was just 70%.PANI/BiPO₄ was prepared by synthesis BiPO₄ in the presence of PANI.The maximum degradation rate was 93.81% at PANI 7 wt% doped by H3PO4.?2?BiVO₄/PANI was prepared by polymerization ANI in the presence of BiVO₄.The maximum degradation rate was 81.3% at PANI 0.5 wt% doped by H2SO4,while the degradation rate of pure BiVO₄ was just 59.8%.BiVO₄/PANI/SiO₂ was prepared by BiVO₄/PANI compounding with SiO₂.The degradation rate of trenary system reached 93.81% at PANI 1 wt% doped by H2SO4,and Si/V molar ratio 2.?3?The adsorption rate and adsorption capacity of methyl orange by H2SO4 doped PANI was 95.6% and 23.9mg/g,while the adsorption limit was 45 mg/g.And doped PANI showed good reusability.The adsorption properties of the eigenstates PANI was very poor,which adsorption capacity was just 6 mg/g.The adsorption properties of doped PANI decreased with the decreasing pH value,and increased with the increasing temperature.It also has good adsorption effect on cationic dyes in alkaline environment.PANI adsorption process was consistent with the pesudo-first model and Langmuir adsorption isotherm model.