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Photodegradation of sodium naproxen and oxytetracycline hydrochloride in aqueous medium using as photocatalysts Mg-Al calcined hydrotalcites

Paper ID Volume ID Publish Year Pages File Format Full-Text
26763 43975 2014 8 PDF Available
Title
Photodegradation of sodium naproxen and oxytetracycline hydrochloride in aqueous medium using as photocatalysts Mg-Al calcined hydrotalcites
Abstract

•MgAl LDHs with different MII/MIII molar ratio, were synthesized by the co-precipitation method.•MgAl catalysts were obtained by thermal decomposition (450 °C) of the respective LDH's.•MgAl calcined hydrotalcites were proved for first time in the photodegradation of sodium naproxen and oxytetracycline hydrochloride in aqueous medium.•The efficient mineralization of sodium naproxen and oxytetracycline hydrochloride by the MgAl calcined hydrotalcites was observed.

Layered double hydroxides (LDH) MgAl with different MII/MIII ratios were synthesized by the co-precipitation method. The materials were calcined at 723 K and characterized by XRD, nitrogen adsorption, UV–vis DRS and FTIR. The catalytic activity of the calcined solids was tested in the photodegradation of two water soluble pharmaceuticals: sodium naproxen, a non-steroidal anti-inflammatory, and oxytetracycline hydrochloride, a tetracycline family antibiotic. The synthesized solids mineralize rapidly both pharmaceuticals using UV as light source and after 5 h of reaction, about 90% of sodium naproxen and 70% of oxytetracycline hydrochloride were degraded by the catalyst with the higher photoactivity. Comparative studies were performed with TiO2 P25 commercial semiconductor. The results showed that the MgAl calcined hydrotalcites have a greater photoactivity in the degradation of the target molecules than TiO2. Fluorescence spectroscopy study suggests the generation of hydroxyl radicals as the oxidative species of the target molecules when MgAl calcined hydrotalcites are irradiated.

Graphical abstractUV-light irradiation to the reactant system containing pharmaceutical compounds and Mg-Al calcined hydrotalcites as photocatalysts, provokes the generation of electron–hole pairs, in which the electron is delocalized towards the charge electro deficient Al3+and the hole allows the formation of OH radicals, giving way thus to the photooxidation of the drugs.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
MgAl calcined LDHs; Sodium naproxen photodegradation; Oxytetracycline hydrochloride photodegradation; Sodium naproxen TOC analysis; Oxytetracycline TOC analysis; Fluorescence probe
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Photodegradation of sodium naproxen and oxytetracycline hydrochloride in aqueous medium using as photocatalysts Mg-Al calcined hydrotalcites
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 277, 1 March 2014, Pages 82–89
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us