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Photoactive polymer–nanoclay hybrid photosensitizer for oxidation of phenol in aqueous media with the visible light

Paper ID Volume ID Publish Year Pages File Format Full-Text
26541 43961 2014 7 PDF Available
Title
Photoactive polymer–nanoclay hybrid photosensitizer for oxidation of phenol in aqueous media with the visible light
Abstract

•The hybrid photosensitizer was obtained using pegylated porphyrin and a nanoclay.•The pegylated porphyrin intercalated into the nanoclay.•The photosensitizer generated singlet oxygen which could oxidize phenol.•The efficiency of phenol photooxidation depended on pH.•The photosensitizer could be reused.

The intercalation of a photoactive polymer, polyethylene glycol (PEG2000) containing covalently attached 5,10,15,20-tetrakis(4-hydroxyphenyl)porphyrin chromophores (p-THPP), in Cloisite® 30B (C30B) resulted in formation of a hybrid photosensitizer C30B/p-THPP-PEG2000. The photosensitizer acts as an efficient generator of singlet oxygen in aqueous medium on irradiation with visible light. Structural and photophysical properties of C30B/p-THPP-PEG2000 were determined using complementary physicochemical techniques: X-ray diffraction, laser scanning fluorescence confocal microscopy, and electronic absorption/emission spectroscopies. The C30B/p-THPP-PEG2000 was found to act as an efficient photosensitizer for oxidation of phenol in aqueous solution under irradiation with light at λ > 470 nm. The mechanism and the quantum yield of that process were shown to be strongly pH dependent. The pH effect on acid–base equilibria of porphyrin associated with imine N-protonation as well as the ionization of the phenol molecule were evaluated.

Keywords
Porphyrin; Phenol; PEG; Photosensitizer; Singlet oxygen; Nanoclay
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Photoactive polymer–nanoclay hybrid photosensitizer for oxidation of phenol in aqueous media with the visible light
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 288, 15 August 2014, Pages 39–45
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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