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Published in: Environmental Earth Sciences 11/2020

01-06-2020 | Thematic Issue

Photocatalytic degradation of diclofenac sodium salt: adsorption and reaction kinetic studies

Published in: Environmental Earth Sciences | Issue 11/2020

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Abstract

The photocatalytic oxidation of diclofenac, which is a non-steroidal anti-inflammatory medication, with TiO2 illuminated with UV-A light under constant flow of pure oxygen has been investigated in our laboratories to evaluate the effect of initial reactant concentration on the reaction rate. Diclofenac adsorption experiments under dark conditions were also carried out to get information about the interaction between the organic molecule and the solid catalyst. Adsorption experiments at natural pH under dark conditions confirmed that the negatively charged diclofenac molecule is easily adsorbed on the positively charged surface of titania reaching equilibrium in less than 50 min. According to the Langmuir isotherm, the adsorption constant (Keq) and the maximum uptake of diclofenac (qm) on the surface of commercial TiO2 are 21.1401 L mMol−1DFC and 0.04013 mMoles DFC g−1 TiO2, respectively. Experimental results also indicate that the initial reaction rate of the photocatalytic degradation of diclofenac obeys the Langmuir–Hinshelwood–Hougen–Watson model with a kinetic constant K1 = 0.08489 min−1 and an adsorption parameter K2 = 14.12821 mM−1L. Combined chemical analysis of the reaction samples by HPLC, TOC, and UV–vis spectroscopy indicated that the diclofenac is efficiently mineralized by photocatalysis via hydroxylation of the aromatic rings to form 2-aminophenol, catechol, benzene-triol, 2,6-dichloroaniline, and fumaric acid, which in turn are completely mineralized to CO2 and water.

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Appendix
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Metadata
Title
Photocatalytic degradation of diclofenac sodium salt: adsorption and reaction kinetic studies
Publication date
01-06-2020
Published in
Environmental Earth Sciences / Issue 11/2020
Print ISSN: 1866-6280
Electronic ISSN: 1866-6299
DOI
https://doi.org/10.1007/s12665-020-09017-z

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