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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 mat...

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Main Authors: Kanakaraju, Devagi, Glass, Beverley D., Oelgemöller, Michael
Format: E-Article
Language:English
Published: Elsevier 2015
Subjects:
QD Chemistry
Online Access:http://ir.unimas.my/id/eprint/21488/7/TiO2%20photocatalysis%20of%20naproxen%20%28abstract%29.pdf
http://ir.unimas.my/id/eprint/21488/
http://dx.doi.org/10.1016/j.chemosphere.2015.07.070
http://dx.doi.org/10.1016/j.chemosphere.2015.07.070
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spelling my.unimas.ir.214882018-09-07T02:06:54Z http://ir.unimas.my/id/eprint/21488/ TiO2 photocatalysis of naproxen: Effect of the water matrix, anions and diclofenac on degradation rates Kanakaraju, Devagi Glass, Beverley D. Oelgemöller, Michael 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 2015-09-01 E-Article PeerReviewed text en http://ir.unimas.my/id/eprint/21488/7/TiO2%20photocatalysis%20of%20naproxen%20%28abstract%29.pdf Kanakaraju, Devagi and Glass, Beverley D. and Oelgemöller, Michael (2015) TiO2 photocatalysis of naproxen: Effect of the water matrix, anions and diclofenac on degradation rates. Chemosphere, 139. pp. 579-588. ISSN 0045-6535 http://dx.doi.org/10.1016/j.chemosphere.2015.07.070 http://dx.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 QD Chemistry
spellingShingle QD Chemistry
Kanakaraju, Devagi
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 E-Article
author Kanakaraju, Devagi
Glass, Beverley D.
Oelgemöller, Michael
author_facet Kanakaraju, Devagi
Glass, Beverley D.
Oelgemöller, Michael
author_sort Kanakaraju, Devagi
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
publishDate 2015
url http://ir.unimas.my/id/eprint/21488/7/TiO2%20photocatalysis%20of%20naproxen%20%28abstract%29.pdf
http://ir.unimas.my/id/eprint/21488/
http://dx.doi.org/10.1016/j.chemosphere.2015.07.070
http://dx.doi.org/10.1016/j.chemosphere.2015.07.070
_version_ 1644513535084986368
score 13.211869

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