De-Ethylation and Cleavage of Rhodamine B by a Zirconium Phosphate/Silver Bromide Composite Photocatalyst

A composite heterogeneous photocatalyst based on silver bromide was prepared by a reaction of silver exchanged zirconium phosphate (ZrP) and HBr. The ZrP/AgBr composite containing 53 wt% AgBr was tested in the photocatalytic degradation of Rhodamine B (RhB) and exhibited higher catalytic activity wi...

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Veröffentlicht in:Catalysts 2019-01, Vol.9 (1), p.3
Hauptverfasser: Pica, Monica, Calzuola, Silvia, Donnadio, Anna, Gentili, Pier Luigi, Nocchetti, Morena, Casciola, Mario
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creator Pica, Monica
Calzuola, Silvia
Donnadio, Anna
Gentili, Pier Luigi
Nocchetti, Morena
Casciola, Mario
description A composite heterogeneous photocatalyst based on silver bromide was prepared by a reaction of silver exchanged zirconium phosphate (ZrP) and HBr. The ZrP/AgBr composite containing 53 wt% AgBr was tested in the photocatalytic degradation of Rhodamine B (RhB) and exhibited higher catalytic activity with respect to pure AgBr. As a matter of fact, the time needed to achieve a percentage of chromophore cleavage of about 90% was 3 min for the composite versus the 30 min needed for pure AgBr. The ZrP/AgBr composite turned out to be stable for at least three consecutive cycles. The UV-Vis spectra of the RhB solution, recorded at different irradiation times, were also decomposed and the concentration of the species formed by de-ethylation and cleavage processes during photocatalysis were calculated; the data obtained for the AgBr-based catalysis were also compared with those for the AgCl-based catalysis, and the degradation mechanism was suggested for both catalytic systems.
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The ZrP/AgBr composite containing 53 wt% AgBr was tested in the photocatalytic degradation of Rhodamine B (RhB) and exhibited higher catalytic activity with respect to pure AgBr. As a matter of fact, the time needed to achieve a percentage of chromophore cleavage of about 90% was 3 min for the composite versus the 30 min needed for pure AgBr. The ZrP/AgBr composite turned out to be stable for at least three consecutive cycles. The UV-Vis spectra of the RhB solution, recorded at different irradiation times, were also decomposed and the concentration of the species formed by de-ethylation and cleavage processes during photocatalysis were calculated; the data obtained for the AgBr-based catalysis were also compared with those for the AgCl-based catalysis, and the degradation mechanism was suggested for both catalytic systems.</description><identifier>ISSN: 2073-4344</identifier><identifier>EISSN: 2073-4344</identifier><identifier>DOI: 10.3390/catal9010003</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>Catalysis ; Catalysts ; Catalytic activity ; Chemical reactions ; Chromophores ; Cleavage ; Composite materials ; Morphology ; Nanoparticles ; Particle size ; Photocatalysis ; Photocatalysts ; Photodegradation ; Rhodamine ; Scanning electron microscopy ; Silver ; Silver chloride ; Spectrum analysis ; Zirconium</subject><ispartof>Catalysts, 2019-01, Vol.9 (1), p.3</ispartof><rights>2018 by the authors. 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subjects Catalysis
Catalysts
Catalytic activity
Chemical reactions
Chromophores
Cleavage
Composite materials
Morphology
Nanoparticles
Particle size
Photocatalysis
Photocatalysts
Photodegradation
Rhodamine
Scanning electron microscopy
Silver
Silver chloride
Spectrum analysis
Zirconium
title De-Ethylation and Cleavage of Rhodamine B by a Zirconium Phosphate/Silver Bromide Composite Photocatalyst
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