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Exploring the Multifunctionality of Mechanochemically Synthesized γ-Alumina with Incorporated Selected Metal Oxide Species

γ-Alumina with incorporated metal oxide species (including Fe, Cu, Zn, Bi, and Ga) was synthesized by liquid-assisted grinding—mechanochemical synthesis, applying boehmite as the alumina precursor and suitable metal salts. Various contents of metal elements (5 wt.%, 10 wt.%, and 20 wt.%) were used t...

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Autores principales: Dubadi, Rabindra, Weidner, Ewelina, Samojeden, Bogdan, Jesionowski, Teofil, Ciesielczyk, Filip, Huang, Songping, Jaroniec, Mietek
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
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Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10004189/
https://www.ncbi.nlm.nih.gov/pubmed/36903248
http://dx.doi.org/10.3390/molecules28052002
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author Dubadi, Rabindra
Weidner, Ewelina
Samojeden, Bogdan
Jesionowski, Teofil
Ciesielczyk, Filip
Huang, Songping
Jaroniec, Mietek
author_facet Dubadi, Rabindra
Weidner, Ewelina
Samojeden, Bogdan
Jesionowski, Teofil
Ciesielczyk, Filip
Huang, Songping
Jaroniec, Mietek
author_sort Dubadi, Rabindra
collection PubMed
description γ-Alumina with incorporated metal oxide species (including Fe, Cu, Zn, Bi, and Ga) was synthesized by liquid-assisted grinding—mechanochemical synthesis, applying boehmite as the alumina precursor and suitable metal salts. Various contents of metal elements (5 wt.%, 10 wt.%, and 20 wt.%) were used to tune the composition of the resulting hybrid materials. The different milling time was tested to find the most suitable procedure that allowed the preparation of porous alumina incorporated with selected metal oxide species. The block copolymer, Pluronic P123, was used as a pore-generating agent. Commercial γ−alumina (S(BET) = 96 m(2)·g(−1)), and the sample fabricated after two hours of initial grinding of boehmite (S(BET) = 266 m(2)·g(−1)), were used as references. Analysis of another sample of γ-alumina prepared within 3 h of one-pot milling revealed a higher surface area (S(BET) = 320 m(2)·g(−1)) that did not increase with a further increase in the milling time. So, three hours of grinding time were set as optimal for this material. The synthesized samples were characterized by low-temperature N(2) sorption, TGA/DTG, XRD, TEM, EDX, elemental mapping, and XRF techniques. The higher loading of metal oxide into the alumina structure was confirmed by the higher intensity of the XRF peaks. Samples synthesized with the lowest metal oxide content (5 wt.%) were tested for selective catalytic reduction of NO with NH(3) (NH(3)-SCR). Among all tested samples, besides pristine Al(2)O(3) and alumina incorporated with gallium oxide, the increase in reaction temperature accelerated the NO conversion. The highest NO conversion rate was observed for Fe(2)O(3)-incorporated alumina (70%) at 450 °C and CuO-incorporated alumina (71%) at 300 °C. The CO(2) capture was also studied for synthesized samples and the sample of alumina with incorporated Bi(2)O(3) (10 wt.%) gave the best result (1.16 mmol·g(−1)) at 25 °C, while alumina alone could adsorb only 0.85 mmol·g(−1) of CO(2). Furthermore, the synthesized samples were tested for antimicrobial properties and found to be quite active against Gram-negative bacteria, P. aeruginosa (PA). The measured Minimum Inhibitory Concentration (MIC) values for the alumina samples with incorporated Fe, Cu, and Bi oxide (10 wt.%) were found to be 4 µg·mL(−1), while 8 µg·mL(−1) was obtained for pure alumina.
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spelling pubmed-100041892023-03-11 Exploring the Multifunctionality of Mechanochemically Synthesized γ-Alumina with Incorporated Selected Metal Oxide Species Dubadi, Rabindra Weidner, Ewelina Samojeden, Bogdan Jesionowski, Teofil Ciesielczyk, Filip Huang, Songping Jaroniec, Mietek Molecules Article γ-Alumina with incorporated metal oxide species (including Fe, Cu, Zn, Bi, and Ga) was synthesized by liquid-assisted grinding—mechanochemical synthesis, applying boehmite as the alumina precursor and suitable metal salts. Various contents of metal elements (5 wt.%, 10 wt.%, and 20 wt.%) were used to tune the composition of the resulting hybrid materials. The different milling time was tested to find the most suitable procedure that allowed the preparation of porous alumina incorporated with selected metal oxide species. The block copolymer, Pluronic P123, was used as a pore-generating agent. Commercial γ−alumina (S(BET) = 96 m(2)·g(−1)), and the sample fabricated after two hours of initial grinding of boehmite (S(BET) = 266 m(2)·g(−1)), were used as references. Analysis of another sample of γ-alumina prepared within 3 h of one-pot milling revealed a higher surface area (S(BET) = 320 m(2)·g(−1)) that did not increase with a further increase in the milling time. So, three hours of grinding time were set as optimal for this material. The synthesized samples were characterized by low-temperature N(2) sorption, TGA/DTG, XRD, TEM, EDX, elemental mapping, and XRF techniques. The higher loading of metal oxide into the alumina structure was confirmed by the higher intensity of the XRF peaks. Samples synthesized with the lowest metal oxide content (5 wt.%) were tested for selective catalytic reduction of NO with NH(3) (NH(3)-SCR). Among all tested samples, besides pristine Al(2)O(3) and alumina incorporated with gallium oxide, the increase in reaction temperature accelerated the NO conversion. The highest NO conversion rate was observed for Fe(2)O(3)-incorporated alumina (70%) at 450 °C and CuO-incorporated alumina (71%) at 300 °C. The CO(2) capture was also studied for synthesized samples and the sample of alumina with incorporated Bi(2)O(3) (10 wt.%) gave the best result (1.16 mmol·g(−1)) at 25 °C, while alumina alone could adsorb only 0.85 mmol·g(−1) of CO(2). Furthermore, the synthesized samples were tested for antimicrobial properties and found to be quite active against Gram-negative bacteria, P. aeruginosa (PA). The measured Minimum Inhibitory Concentration (MIC) values for the alumina samples with incorporated Fe, Cu, and Bi oxide (10 wt.%) were found to be 4 µg·mL(−1), while 8 µg·mL(−1) was obtained for pure alumina. MDPI 2023-02-21 /pmc/articles/PMC10004189/ /pubmed/36903248 http://dx.doi.org/10.3390/molecules28052002 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/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 (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Dubadi, Rabindra
Weidner, Ewelina
Samojeden, Bogdan
Jesionowski, Teofil
Ciesielczyk, Filip
Huang, Songping
Jaroniec, Mietek
Exploring the Multifunctionality of Mechanochemically Synthesized γ-Alumina with Incorporated Selected Metal Oxide Species
title Exploring the Multifunctionality of Mechanochemically Synthesized γ-Alumina with Incorporated Selected Metal Oxide Species
title_full Exploring the Multifunctionality of Mechanochemically Synthesized γ-Alumina with Incorporated Selected Metal Oxide Species
title_fullStr Exploring the Multifunctionality of Mechanochemically Synthesized γ-Alumina with Incorporated Selected Metal Oxide Species
title_full_unstemmed Exploring the Multifunctionality of Mechanochemically Synthesized γ-Alumina with Incorporated Selected Metal Oxide Species
title_short Exploring the Multifunctionality of Mechanochemically Synthesized γ-Alumina with Incorporated Selected Metal Oxide Species
title_sort exploring the multifunctionality of mechanochemically synthesized γ-alumina with incorporated selected metal oxide species
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10004189/
https://www.ncbi.nlm.nih.gov/pubmed/36903248
http://dx.doi.org/10.3390/molecules28052002
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