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UV and solar photo-degradation of naproxen: TiO₂ catalyst effect, reaction kinetics, products identification and toxicity assessment.
J Hazard Mater. 2016 Mar 05; 304:329-36.JH

Abstract

Direct photolysis and TiO2-photocatalytic degradation of naproxen (NPX) in aqueous solution were studied using a UV lamp and solar irradiation. The degradation of NPX was found to be in accordance with pseudo-first order kinetics, the photocatalytic process being more efficient than photolysis. The NPX removal by photolysis (pHinitial 6.5) was 83% after 3h, with 11% of chemical oxygen demand (COD) reduction, whereas the TiO2-UV process led to higher removals of both NPX (98%) and COD (25%). The apparent pseudo-first-order rate constant (kapp) for NPX degradation by photolysis ranged from 0.0050 min(-1) at pH 3.5 to 0.0095 min(-1) at pH 6.5, while it was estimated to be 0.0063 min(-1) under acidic conditions in photocatalysis, increasing by 4-fold at pH 6.5. Ultra High Performance Liquid chromatography (UHPLC) coupled with a triple quadrupole detector and also a hybrid mass spectrometer which combines the linear ion trap triple quadrupole (LTQ) and OrbiTrap mass analyser, were used to identify NPX degradation products. The main intermediates detected were 1-(6-methoxynaphtalene-2-yl) ethylhydroperoxide, 2-ethyl-6-methoxynaphthalene, 1-(6-methoxynaphtalen-2-yl) ethanol, 1-(6-methoxynaphtalen-2-yl) ethanone and malic acid. Solar photocatalysis of NPX showed COD removals of 33% and 65% after 3 and 4h of treatment, respectively, and some reduction of acute toxicity, evaluated by the exposure of Eisenia andrei to OECD soils spiked with NPX-treated solutions.

Authors+Show Affiliations

University of Sfax, Laboratory of Water, Energy and Environment, National School of Engineers of Sfax (ENIS), Route de Soukra Km 3.5, PO Box 1173, 3038 Sfax, Tunisia.University of Gafsa, Research Unit of Materials, Environment and Energy, Campus Universitaire Sidi Ahmed Zarroug, 2112 Gafsa, Tunisia.University of Sfax, Laboratory of Water, Energy and Environment, National School of Engineers of Sfax (ENIS), Route de Soukra Km 3.5, PO Box 1173, 3038 Sfax, Tunisia; Higher Institute of Biotechnology of Sfax (ISBS), Route de Soukra Km 3, 5 PO Box 1175, 3038 Sfax, Tunisia.LCM - Laboratory of Catalysis and Materials - Associate Laboratory LSRE-LCM, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.LCM - Laboratory of Catalysis and Materials - Associate Laboratory LSRE-LCM, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.University of Sfax, Laboratory of Water, Energy and Environment, National School of Engineers of Sfax (ENIS), Route de Soukra Km 3.5, PO Box 1173, 3038 Sfax, Tunisia; Higher Institute of Biotechnology of Sfax (ISBS), Route de Soukra Km 3, 5 PO Box 1175, 3038 Sfax, Tunisia. Electronic address: mohamed.ksibi@isbs.rnu.tn.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

26571001

Citation

Jallouli, Nabil, et al. "UV and Solar Photo-degradation of Naproxen: TiO₂ Catalyst Effect, Reaction Kinetics, Products Identification and Toxicity Assessment." Journal of Hazardous Materials, vol. 304, 2016, pp. 329-36.
Jallouli N, Elghniji K, Hentati O, et al. UV and solar photo-degradation of naproxen: TiO₂ catalyst effect, reaction kinetics, products identification and toxicity assessment. J Hazard Mater. 2016;304:329-36.
Jallouli, N., Elghniji, K., Hentati, O., Ribeiro, A. R., Silva, A. M., & Ksibi, M. (2016). UV and solar photo-degradation of naproxen: TiO₂ catalyst effect, reaction kinetics, products identification and toxicity assessment. Journal of Hazardous Materials, 304, 329-36. https://doi.org/10.1016/j.jhazmat.2015.10.045
Jallouli N, et al. UV and Solar Photo-degradation of Naproxen: TiO₂ Catalyst Effect, Reaction Kinetics, Products Identification and Toxicity Assessment. J Hazard Mater. 2016 Mar 5;304:329-36. PubMed PMID: 26571001.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - UV and solar photo-degradation of naproxen: TiO₂ catalyst effect, reaction kinetics, products identification and toxicity assessment. AU - Jallouli,Nabil, AU - Elghniji,Kais, AU - Hentati,Olfa, AU - Ribeiro,Ana R, AU - Silva,Adrián M T, AU - Ksibi,Mohamed, Y1 - 2015/10/28/ PY - 2015/07/18/received PY - 2015/09/18/revised PY - 2015/10/22/accepted PY - 2015/11/17/entrez PY - 2015/11/17/pubmed PY - 2016/9/30/medline KW - Acute toxicity KW - Chemical oxygen demand (COD) KW - Naproxen KW - Photocatalysis KW - Photolysis SP - 329 EP - 36 JF - Journal of hazardous materials JO - J. Hazard. Mater. VL - 304 N2 - Direct photolysis and TiO2-photocatalytic degradation of naproxen (NPX) in aqueous solution were studied using a UV lamp and solar irradiation. The degradation of NPX was found to be in accordance with pseudo-first order kinetics, the photocatalytic process being more efficient than photolysis. The NPX removal by photolysis (pHinitial 6.5) was 83% after 3h, with 11% of chemical oxygen demand (COD) reduction, whereas the TiO2-UV process led to higher removals of both NPX (98%) and COD (25%). The apparent pseudo-first-order rate constant (kapp) for NPX degradation by photolysis ranged from 0.0050 min(-1) at pH 3.5 to 0.0095 min(-1) at pH 6.5, while it was estimated to be 0.0063 min(-1) under acidic conditions in photocatalysis, increasing by 4-fold at pH 6.5. Ultra High Performance Liquid chromatography (UHPLC) coupled with a triple quadrupole detector and also a hybrid mass spectrometer which combines the linear ion trap triple quadrupole (LTQ) and OrbiTrap mass analyser, were used to identify NPX degradation products. The main intermediates detected were 1-(6-methoxynaphtalene-2-yl) ethylhydroperoxide, 2-ethyl-6-methoxynaphthalene, 1-(6-methoxynaphtalen-2-yl) ethanol, 1-(6-methoxynaphtalen-2-yl) ethanone and malic acid. Solar photocatalysis of NPX showed COD removals of 33% and 65% after 3 and 4h of treatment, respectively, and some reduction of acute toxicity, evaluated by the exposure of Eisenia andrei to OECD soils spiked with NPX-treated solutions. SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/26571001/UV_and_solar_photo_degradation_of_naproxen:_TiO₂_catalyst_effect_reaction_kinetics_products_identification_and_toxicity_assessment_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(15)30172-2 DB - PRIME DP - Unbound Medicine ER -