Unexpected effect of ozone on the paraben's mixture degradation using TiO2 supported nanotubes

The Science of the Total Environment
João GomesRui C Martins

Abstract

Titanium dioxide can present advantages when coupled with ozonation. Moreover, the catalytic ozonation can be enhanced by radiation. The main disadvantage of this technology is the use of a suspended catalyst entailing a separation step. Thus, catalytic ozonation was analysed using supported TiO2 nanotubes prepared by anodization at different voltages. The effect of different radiation sources on the catalytic ozonation of parabens was tested. The increase on voltage preparation led to plates with higher surface areas from 60 to 280 cm2. However, this did not improve the parabens mixture degradation during UVA photocatalytic ozonation. The use of sunlight radiation allows a significant reduction in terms of time necessary for total parabens degradation from 15 to 10 min. However, the amount of ozone required doubles. Catalytic ozonation presents worst results than single ozonation. This means that molecular ozone is the main responsible for degradation. No dissolved ozone was detected at the experiments with supported nanotubes which could mean that it was adsorbed on the catalysts surface decreasing the degradation rates. The presence of municipal wastewaters as matrix inhibited parabens degradation for both single and catalyt...Continue Reading

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Feb 12, 2017·The Science of the Total Environment·João GomesRui C Martins
Jul 29, 2017·The Science of the Total Environment·João F GomesRui C Martins
Dec 25, 2017·Environmental Science and Pollution Research International·João F GomesRui C Martins
Sep 22, 2018·The Science of the Total Environment·João F GomesRui C Martins
Mar 26, 2019·The Science of the Total Environment·Muhammad Bilal, Hafiz M N Iqbal

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