title: Visible-light photocatalytic degradation performances and thermal stability due to the synergetic effect of TiO2 with conductive copolymers of polyaniline and polypyrrole.
abstract: Conductive polypyrrole-polyaniline/TiO2 nanocomposites (PPy-PANI/TiO2) were prepared by in situ oxidative copolymerization of pyrrole and aniline monomers in the presence of TiO2. For comparison studies, polypyrrole/TiO2 (PPy/TiO2) and polyaniline/TiO2 (PANI/TiO2) were also prepared. The samples were characterized by X-ray diffraction, transmission electron microscopy, UV-vis diffuse reflectance spectroscopy, zeta potential analysis, Fourier transform infrared spectroscopy, thermogravimetric analysis and photocurrent tests. In contrast to PPy/TiO2 and PANI/TiO2, PPy-PANI/TiO2 exhibits obvious absorption in the visible-light range, and is much superior to PPy/TiO2 and PANI/TiO2 in thermal stability. It is found that PPy-PANI/TiO2 performs well in the visible-light photocatalytic degradation of 4-nitrophenol. The optimized pyrrole : aniline : TiO2 molar ratio for best performance is 0.75 : 0.25 : 100. The efficacy of PPy-PANI/TiO2 is attributed to its conductivity, conjugated structure, as well as to the synergy amidst polypyrrole, polyaniline and TiO2.
authors.affiliation: Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, PR China.
authors.forename: Fang
authors.initials: F
authors.lastname: Deng
authors.forename: Lujuan
authors.initials: L
authors.lastname: Min
authors.forename: Xubiao
authors.initials: X
authors.lastname: Luo
authors.forename: Shaolin
authors.initials: S
authors.lastname: Wu
authors.forename: Shenglian
authors.initials: S
authors.lastname: Luo
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry*; D002384:Catalysis; D008027:Light; D009596:Nitrophenols / Q000737:chemistry; D010084:Oxidation-Reduction; D010782:Photolysis; D011108:Polymers / Q000737:chemistry*; D011758:Pyrroles / Q000737:chemistry*; D013696:Temperature; D014025:Titanium / Q000737:chemistry*
chemical_list: D000814:Aniline Compounds; D009596:Nitrophenols; D011108:Polymers; D011758:Pyrroles; C416807:polyaniline; C009495:titanium dioxide; C067635:polypyrrole; D014025:Titanium; C024836:4-nitrophenol