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Evolution of Surface Catalytic Sites on Bimetal Silica-Based Fenton-Like Catalysts for Degradation of Dyes with Different Molecular Charges

We present here important new findings on the direct synthesis of bimetal Cu-Mn containing porous silica catalyst and the effects of structure-directing agent removal from the prepared nanomaterial on the evolution of surface catalytic sites. The extraction-calcination procedure of the structure-dir...

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Autores principales: Trendafilova, Ivalina, Šuligoj, Andraž, Ristić, Alenka, Van de Velde, Nigel, Dražić, Goran, Opresnik, Mojca, Zabukovec Logar, Nataša, Pintar, Albin, Novak Tušar, Nataša
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7761658/
https://www.ncbi.nlm.nih.gov/pubmed/33287283
http://dx.doi.org/10.3390/nano10122419
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author Trendafilova, Ivalina
Šuligoj, Andraž
Ristić, Alenka
Van de Velde, Nigel
Dražić, Goran
Opresnik, Mojca
Zabukovec Logar, Nataša
Pintar, Albin
Novak Tušar, Nataša
author_facet Trendafilova, Ivalina
Šuligoj, Andraž
Ristić, Alenka
Van de Velde, Nigel
Dražić, Goran
Opresnik, Mojca
Zabukovec Logar, Nataša
Pintar, Albin
Novak Tušar, Nataša
author_sort Trendafilova, Ivalina
collection PubMed
description We present here important new findings on the direct synthesis of bimetal Cu-Mn containing porous silica catalyst and the effects of structure-directing agent removal from the prepared nanomaterial on the evolution of surface catalytic sites. The extraction-calcination procedure of the structure-directing agent removal led to the formation of Cu and Mn oxo-clusters and Cu and Mn oxide nanoparticles smaller than 5 nm, while the solely calcination procedure led to the mentioned species and in addition to the appearance of CuO nanoparticles 20 nm in size. Catalysts were tested in the Fenton-like catalytic degradation of dyes with different molecular charge (cationic, anionic, and zwitterionic) as model organic pollutants in wastewater at neutral pH. Significantly faster degradation of cationic and anionic dyes in the first 60 min was observed with the catalyst containing larger CuO nanoparticles (>20 nm) due to the less hindered generation of (•)OH radicals and slower obstructing of the active sites on the catalysts surface by intermediates. However, this was not found beneficial for zwitterionic dye with no adsorption on the catalysts surface, where the catalyst with smaller Cu species performed better.
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spelling pubmed-77616582020-12-26 Evolution of Surface Catalytic Sites on Bimetal Silica-Based Fenton-Like Catalysts for Degradation of Dyes with Different Molecular Charges Trendafilova, Ivalina Šuligoj, Andraž Ristić, Alenka Van de Velde, Nigel Dražić, Goran Opresnik, Mojca Zabukovec Logar, Nataša Pintar, Albin Novak Tušar, Nataša Nanomaterials (Basel) Article We present here important new findings on the direct synthesis of bimetal Cu-Mn containing porous silica catalyst and the effects of structure-directing agent removal from the prepared nanomaterial on the evolution of surface catalytic sites. The extraction-calcination procedure of the structure-directing agent removal led to the formation of Cu and Mn oxo-clusters and Cu and Mn oxide nanoparticles smaller than 5 nm, while the solely calcination procedure led to the mentioned species and in addition to the appearance of CuO nanoparticles 20 nm in size. Catalysts were tested in the Fenton-like catalytic degradation of dyes with different molecular charge (cationic, anionic, and zwitterionic) as model organic pollutants in wastewater at neutral pH. Significantly faster degradation of cationic and anionic dyes in the first 60 min was observed with the catalyst containing larger CuO nanoparticles (>20 nm) due to the less hindered generation of (•)OH radicals and slower obstructing of the active sites on the catalysts surface by intermediates. However, this was not found beneficial for zwitterionic dye with no adsorption on the catalysts surface, where the catalyst with smaller Cu species performed better. MDPI 2020-12-03 /pmc/articles/PMC7761658/ /pubmed/33287283 http://dx.doi.org/10.3390/nano10122419 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Trendafilova, Ivalina
Šuligoj, Andraž
Ristić, Alenka
Van de Velde, Nigel
Dražić, Goran
Opresnik, Mojca
Zabukovec Logar, Nataša
Pintar, Albin
Novak Tušar, Nataša
Evolution of Surface Catalytic Sites on Bimetal Silica-Based Fenton-Like Catalysts for Degradation of Dyes with Different Molecular Charges
title Evolution of Surface Catalytic Sites on Bimetal Silica-Based Fenton-Like Catalysts for Degradation of Dyes with Different Molecular Charges
title_full Evolution of Surface Catalytic Sites on Bimetal Silica-Based Fenton-Like Catalysts for Degradation of Dyes with Different Molecular Charges
title_fullStr Evolution of Surface Catalytic Sites on Bimetal Silica-Based Fenton-Like Catalysts for Degradation of Dyes with Different Molecular Charges
title_full_unstemmed Evolution of Surface Catalytic Sites on Bimetal Silica-Based Fenton-Like Catalysts for Degradation of Dyes with Different Molecular Charges
title_short Evolution of Surface Catalytic Sites on Bimetal Silica-Based Fenton-Like Catalysts for Degradation of Dyes with Different Molecular Charges
title_sort evolution of surface catalytic sites on bimetal silica-based fenton-like catalysts for degradation of dyes with different molecular charges
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7761658/
https://www.ncbi.nlm.nih.gov/pubmed/33287283
http://dx.doi.org/10.3390/nano10122419
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