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Elaboration and study of poly(vinylidene fluoride)–anatase TiO2 composite membranes in photocatalytic degradation of dyes

Paper ID Volume ID Publish Year Pages File Format Full-Text
42921 45947 2009 8 PDF Available
Title
Elaboration and study of poly(vinylidene fluoride)–anatase TiO2 composite membranes in photocatalytic degradation of dyes
Abstract

Porous PVdF-based membranes filled with anatase (TiO2) nanocrystalline particles were prepared by using a new phase inversion technique for entrapment of TiO2. The prepared samples were characterized by scanning electron microscopy, thermal gravimetry analysis, and contact angle measurements. The SEM investigation showed a fair distribution in the membranes of the TiO2 particles, mainly in aggregate form. The best photocatalytic membrane had a pore size of 0.96 μm, with a maximum porosity of 86% at 0.5 TiO2/PVdF weight ratio. The original porous TiO2/PVdF membranes showed a very weak degradation ability of dyes in an aqueous medium due to their poor wetting. We showed that a prior membrane conditioning in ethanol increased the membrane wetting, thus the dye degradation rate by making the TiO2 particles in the internal structure accessible to the external medium. The adsorption capacity of the TiO2/PVdF membrane was studied with the aqueous solutions of Brilliant Green (BG) and Indigo Carmin (IC) dyes, and the photocatalytic efficiency of TiO2 immobilized in PVdF was compared with that of the conventional TiO2 Degussa P25 catalyst. The rate of TiO2/PVdF membrane degradation photocatalytic was 6.1 and 2.4 μmol L−1 min−1 for IC and BG respectively, against 8.7 and 5.9 μmol L−1 min−1 for the P25 TiO2. The Langmuir-Hinshelwood model was adequate to describe the rate of dye degradation only when the amount of dyes adsorbed on photocatalytic material is significant.

Graphical abstractThe adsorption capacity of the TiO2/PVdF membrane is enhanced by a prior conditioning in ethanol. The photocatalytic efficiency of TiO2 immobilized in PVdF was compared with that of the conventional TiO2 Degussa P25 catalyst. The rate of TiO2/PVdF membrane degradation photocatalytic was 6.1 and 2.4 μmol L−1 min−1 for IC and BG respectively, against 8.7 and 5.9 μmol L−1 min−1 for the P25 TiO2.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
PVdF-TiO2 catalyst; Photodegradation; Dyes; Microporous membranes; Phase inversion
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Elaboration and study of poly(vinylidene fluoride)–anatase TiO2 composite membranes in photocatalytic degradation of dyes
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 358, Issue 1, 30 April 2009, Pages 13–20
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us