TiO2 photocatalysis of naproxen : effect of the water matrix, anions and diclofenac on degradation rates

The TiO2 photocatalytic degradation of the active pharmaceutical ingredient (API) naproxen (NPX) has been studied using a laboratory-scale photoreactor equipped with a medium pressure mercury lamp. UV/TiO2 photocatalysis proved highly efficient in the elimination of NPX from a variety of water matri...

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Main Authors: Devagi, Kanakaraju, Motti, Cherie A., Glass, Beverley D., Oelgemöller, Michael
Format: Article
Language:English
Published: Elsevier Ltd 2015
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Online Access:http://ir.unimas.my/id/eprint/21491/1/Chemosphere-2015-p579%20%28abstrak%29.pdf
http://ir.unimas.my/id/eprint/21491/
https://www.sciencedirect.com/science/article/pii/S0045653515007912
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Institution: Universiti Malaysia Sarawak
Language: English
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spelling my.unimas.ir.214912022-12-19T08:32:34Z http://ir.unimas.my/id/eprint/21491/ TiO2 photocatalysis of naproxen : effect of the water matrix, anions and diclofenac on degradation rates Devagi, Kanakaraju Motti, Cherie A. Glass, Beverley D. Oelgemöller, Michael Q Science (General) QD Chemistry The TiO2 photocatalytic degradation of the active pharmaceutical ingredient (API) naproxen (NPX) has been studied using a laboratory-scale photoreactor equipped with a medium pressure mercury lamp. UV/TiO2 photocatalysis proved highly efficient in the elimination of NPX from a variety of water matrices, including distilled water, unfiltered river water and drinking water, although the rate of reaction was not always proportional to TiO2 concentration. However, the NPX degradation rate, which follows first-order kinetics, was appreciably reduced in river water spiked with phosphate and chloride ions, a dual anion system. Addition of chloride into drinking water enhanced the TiO2-photocatalysed degradation rate. Competitive degradation studies also revealed that the NPX degradation was greatly reduced in the presence of increased concentrations of another API, diclofenac (DCF). This was established by (i) the extent of mineralization, as determined by dissolved organic carbon (DOC) content, and (ii) the formation of intermediate NPX by-products, identified using liquid chromatography and electrospray ionization (positive and negative mode) mass spectrometry techniques. This study demonstrates that competition for active sites (anions or DCF) and formation of multiple photoproducts resulting from synergistic interactions (between both APIs) are key to the TiO2-photocatalysed NPX degradation. Elsevier Ltd 2015 Article PeerReviewed text en http://ir.unimas.my/id/eprint/21491/1/Chemosphere-2015-p579%20%28abstrak%29.pdf Devagi, Kanakaraju and Motti, Cherie A. and Glass, Beverley D. and Oelgemöller, Michael (2015) TiO2 photocatalysis of naproxen : effect of the water matrix, anions and diclofenac on degradation rates. Chemospehere, 139. pp. 579-588. ISSN 0045-6535 https://www.sciencedirect.com/science/article/pii/S0045653515007912 DOI:org/10.1016/j.chemosphere.2015.07.070
institution Universiti Malaysia Sarawak
building Centre for Academic Information Services (CAIS)
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Sarawak
content_source UNIMAS Institutional Repository
url_provider http://ir.unimas.my/
language English
topic Q Science (General)
QD Chemistry
spellingShingle Q Science (General)
QD Chemistry
Devagi, Kanakaraju
Motti, Cherie A.
Glass, Beverley D.
Oelgemöller, Michael
TiO2 photocatalysis of naproxen : effect of the water matrix, anions and diclofenac on degradation rates
description The TiO2 photocatalytic degradation of the active pharmaceutical ingredient (API) naproxen (NPX) has been studied using a laboratory-scale photoreactor equipped with a medium pressure mercury lamp. UV/TiO2 photocatalysis proved highly efficient in the elimination of NPX from a variety of water matrices, including distilled water, unfiltered river water and drinking water, although the rate of reaction was not always proportional to TiO2 concentration. However, the NPX degradation rate, which follows first-order kinetics, was appreciably reduced in river water spiked with phosphate and chloride ions, a dual anion system. Addition of chloride into drinking water enhanced the TiO2-photocatalysed degradation rate. Competitive degradation studies also revealed that the NPX degradation was greatly reduced in the presence of increased concentrations of another API, diclofenac (DCF). This was established by (i) the extent of mineralization, as determined by dissolved organic carbon (DOC) content, and (ii) the formation of intermediate NPX by-products, identified using liquid chromatography and electrospray ionization (positive and negative mode) mass spectrometry techniques. This study demonstrates that competition for active sites (anions or DCF) and formation of multiple photoproducts resulting from synergistic interactions (between both APIs) are key to the TiO2-photocatalysed NPX degradation.
format Article
author Devagi, Kanakaraju
Motti, Cherie A.
Glass, Beverley D.
Oelgemöller, Michael
author_facet Devagi, Kanakaraju
Motti, Cherie A.
Glass, Beverley D.
Oelgemöller, Michael
author_sort Devagi, Kanakaraju
title TiO2 photocatalysis of naproxen : effect of the water matrix, anions and diclofenac on degradation rates
title_short TiO2 photocatalysis of naproxen : effect of the water matrix, anions and diclofenac on degradation rates
title_full TiO2 photocatalysis of naproxen : effect of the water matrix, anions and diclofenac on degradation rates
title_fullStr TiO2 photocatalysis of naproxen : effect of the water matrix, anions and diclofenac on degradation rates
title_full_unstemmed TiO2 photocatalysis of naproxen : effect of the water matrix, anions and diclofenac on degradation rates
title_sort tio2 photocatalysis of naproxen : effect of the water matrix, anions and diclofenac on degradation rates
publisher Elsevier Ltd
publishDate 2015
url http://ir.unimas.my/id/eprint/21491/1/Chemosphere-2015-p579%20%28abstrak%29.pdf
http://ir.unimas.my/id/eprint/21491/
https://www.sciencedirect.com/science/article/pii/S0045653515007912
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