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Photocatalytic degradation of Allura red and Quinoline yellow with Polyaniline/TiO2 nanocomposite

Paper ID Volume ID Publish Year Pages File Format Full-Text
47710 46481 2009 8 PDF Available
Title
Photocatalytic degradation of Allura red and Quinoline yellow with Polyaniline/TiO2 nanocomposite
Abstract

A series of polyaniline/TiO2 (PANI/TiO2) composites has been prepared from aniline and TiO2 under various polymerization conditions. Among these conditions are the concentrations of aniline, ammonium persulfate, HCl, sodium dodecyl sulfate, and the amount of TiO2. More composites were obtained by replacing HCl with H2SO4, H3PO4, and HNO3 as dopant acids. Scanning electron microscopy, UV/vis-diffuse reflectance spectroscopy, FTIR and TGA were used to characterize some of these composites. The rate of degradation of dyes with these composites followed first-order kinetics in the dye concentration. The activity of the composite towards the degradation process differs according to the experimental polymerization conditions. The activity increased with the increase in the concentration of aniline monomer and persulfate, but decreased with increasing the concentration of HCl, sodium dodecyl sulfate, and the amount of TiO2. The activity of composites formed in the presence of different acids followed the order H2SO4 > H3PO4 > HCl > HNO3. The rate of composite/dye interaction was enhanced with the UV-irradiation, increasing load of composite, and temperature. It was retarded with the increase in initial dye concentration and pH. The activation parameters were determined and a plausible mechanism was proposed.

Keywords
PANI/TiO2; Nancomposite; Degradation; Kinetics; Allura red; Quinoline yellow
First Page Preview
Photocatalytic degradation of Allura red and Quinoline yellow with Polyaniline/TiO2 nanocomposite
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 91, Issues 1–2, 7 September 2009, Pages 59–66
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis