Preparation And Photocatalytic Performance Of Polyaniline/Titanium/Mica Multilayer-coated Materials

This paper forcuses on building a pholocatalyst of polyaniline/titanium/mica multilayer-coated materials based on the integration of the advantage of titanium-mica pholocatalyst and polyaniline-titanium composite pholocatalyst. The main research contents as follow:Firstly, titanium-mica coated materials were prepared by the alkali neutralization process employing synthetic mica flakes as the base material and TiCl4 as the titanium source. The polyaniline/titanium/mica multilayer-coated materials then were in-situ synthezed with the combination of chemical oxidative polymerizationtechnology. It is clear that the resultant material consists of three-layers. The core is synthetic mica flake, the second cover layer is a uniform and dense TiO2 nano particles, and the third layer is a PANI film with nano size in thickness.Secondly, the conditions for preparing polyaniline/titanium/mica multilayer-coated material were optimized. The result shows that the polyaniline/titanium/mica multilayer-coated material obtained at aniline/SDBS amount-of-substance ratio of 10/1 and the HC1 concentration of 0.2 mol/L, possesses a better electroconductivity and obvious electrochromism phenomenon, suggesting that the electron can transfer on the surface of polyaniline/titanium/mica multilayer-coated material prepared in this conditions.Finally, the characterizations of the polyaniline/titanium/mica multilayer-coated material were investigaed by fluorescence analysis, UV-Vis diffuse reflectance and the adsorption experiment. And the visible light photocatalytic performance of the multilayer in degrading RhB in liquor was discussed. The result indicates that the polyaniline/titanium/mica multilayer-coated material gives a better function of restraining the recombination of photon-generated carrier, photoresponse and adsorption properties. And the visible light photocatalytic performance of titanium-mica coated materials can be improved by coating moderate amounts of PANI. When the dosage of PANI coating materials was 0.05 time as titanium-mica coated materials, the polyaniline-titanium-mica multilayer-coated materials had better visible light photocatalytic performance, which can make RhB remove ethyl and turn into Rh, and the degradation rate of RhB in 5 h up to 65%. But the cover of PANI could be counterproductive in UV-light photocatalytic.