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Preparation of polyaniline-modified TiO2 nanoparticles and their photocatalytic activity under visible light illumination

Paper ID Volume ID Publish Year Pages File Format Full-Text
48380 46504 2008 7 PDF Available
Title
Preparation of polyaniline-modified TiO2 nanoparticles and their photocatalytic activity under visible light illumination
Abstract

Titanium dioxide nanoparticles were modified by polyaniline (PANI) using ‘in situ’ chemical oxidative polymerization method in hydrochloric acid solutions. Powder X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier-transform infrared spectra (FT-IR), X-ray photoelectron spectroscopy spectrum (XPS) and UV–vis spectra were carried out to characterize the composites with different PANI contents. The photocatalytic degradation of phenol was chosen as a model reaction to evaluate the photocatalytic activities of the modified catalysts. Results show that TiO2 nanoparticles are deposited by PANI to mitigate TiO2 particles agglomeration. The modification does not alter the crystalline structure of the TiO2 nanoparticles according to the X-ray diffraction patterns. UV–vis spectra reveal that PANI-modified TiO2 composites show stronger absorption than neat TiO2 under the whole range of visible light. The resulting PANI-modified TiO2 composites exhibit significantly higher photocatalytic activity than that of neat TiO2 on degradation of phenol aqueous solution under visible light irradiation (λ ≥ 400 nm). An optimum of the synergetic effect is found for an initial molar ratio of aniline to TiO2 equal to 1/100.

Keywords
Photocatalytic activity; Titanium dioxide; Phenol degradation; Polyaniline
First Page Preview
Preparation of polyaniline-modified TiO2 nanoparticles and their photocatalytic activity under visible light illumination
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 81, Issues 3–4, 24 June 2008, Pages 267–273
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis