作者：W. Li, Y. Tian, C. Zhao, Q. Zhang, W. Geng
关键字：Photodegradation Heterojunction Visible-light Magnetic response Conducting polymer
论文来源：期刊
具体来源：http://dx.doi.org/10.1016/j.cej.2016.06.022
发表时间：2016年

The polyaniline(PANI)/TiO₂ composite coating was successfully synthesized on the surface of magnetic Fe₃O₄ particles by ammonium persulfate induced in situ chemical oxidative polymerization of aniline and in situ synthesis of TiO₂. Research showed that this novel Fe₃O₄@PANI-TiO₂ composite photocatalyst exhibited fast charge migration ability and enhanced photoactivity. When the content of anatase TiO₂ nanoclusters in the PANI coating was about 0.3 g, the highest photoactivity (k = 1.97  10^–2 min^–1), which is about 4.6 times of the Fe3O4@PANI composite particles, was obtained for decomposing ethylenediaminetetraacetic acid (EDTA) under visible-light irradiation. The enhancement of photoactivity was mainly due to the successful formation of PANI-TiO₂ heterojunctions and fast charge migration ability of PANI coating. In photocatalytic process, the photoexcited electrons in PANI could migrate to the conduction band (CB) of anatase TiO₂, and the photogenerated holes in the valence band (VB) of anatase TiO₂ could directly transfer to the HOMO of PANI. Therefore, the direct recombination of electron-hole pairs would be effecctively inhibited, and both the light response and electrical characteristics were improved for the successful formation of the PANI-TiO₂ heterojunctions. More importantly, the introduction of the magnetic Fe₃O₄ particles could satisfy the simple separation and fulfill the regeneration of the photocatalyst after being used.

                                 W. Li et al. / Chemical Engineering Journal 303 (2016) 282–291