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Rapid measurement of photocatalytic oxidation of poly(vinyl chloride) by in situ FTIR spectrometry of evolved CO2

Lookup NU author(s): Changqing Jin, Professor Paul Christensen, Dr Terry Egerton, Emeritus Professor Jim White

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Abstract

The CO2 generated by UV irradiation of unplasticised PVC pigmented with TiO2 was monitored by in situ Fourier transform infrared (FTIR) spectrometry. CO2 was evolved immediately irradiation began (although no HCI was detected) and when irradiation ceased CO2 evolution fell significantly. A comparison of photogeneration of CO2 from unpigmented and pigmented PVC demonstrated that, although a heavily coated TiO2 (R5) did not increase the rate of CO2 formation, lightly coated liO2 (R3) photocatalysed PVC oxidation to CO 2. As expected for a photocatalytic process, the photogeneration of CO2 increased with increased TiO2 loading. The convenience of the FTIR method allowed the increased rate of oxidation with increasing partial pressure of oxygen, or increasing humidity, to be demonstrated. It was also shown that the rate of photocatalytic oxidation varied as the square root of UV intensity. This dependence would result if recombination of UV generated charge carriers controls the rate of photocatalysis. © 2006 Institute of Materials, Minerals and Mining.


Publication metadata

Author(s): Jin CQ, Christensen PA, Egerton TA, White JR

Publication type: Article

Publication status: Published

Journal: Materials Science and Technology

Year: 2006

Volume: 22

Issue: 8

Pages: 908-914

ISSN (print): 0267-0836

ISSN (electronic): 1743-2847

Publisher: Maney Publishing

URL: http://dx.doi.org/10.1179/174328406X91159

DOI: 10.1179/174328406X91159


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