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Meso- and macroporous silica-based arsenic adsorbents: effect of pore size, nature of the active phase, and silicon release

Arsenic pollution in ground and drinking water is a major problem worldwide due to the natural abundance of arsenic by dissolution from ground sediment or mining activities from anthropogenic activities. To overcome this issue, iron oxides as low-cost and non-toxic materials, have been widely studie...

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Autores principales: Sanna Angotzi, Marco, Mameli, Valentina, Cara, Claudio, Borchert, Konstantin B. L., Steinbach, Christine, Boldt, Regine, Schwarz, Dana, Cannas, Carla
Formato: Online Artículo Texto
Lenguaje:English
Publicado: RSC 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9417704/
https://www.ncbi.nlm.nih.gov/pubmed/36133949
http://dx.doi.org/10.1039/d1na00487e
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author Sanna Angotzi, Marco
Mameli, Valentina
Cara, Claudio
Borchert, Konstantin B. L.
Steinbach, Christine
Boldt, Regine
Schwarz, Dana
Cannas, Carla
author_facet Sanna Angotzi, Marco
Mameli, Valentina
Cara, Claudio
Borchert, Konstantin B. L.
Steinbach, Christine
Boldt, Regine
Schwarz, Dana
Cannas, Carla
author_sort Sanna Angotzi, Marco
collection PubMed
description Arsenic pollution in ground and drinking water is a major problem worldwide due to the natural abundance of arsenic by dissolution from ground sediment or mining activities from anthropogenic activities. To overcome this issue, iron oxides as low-cost and non-toxic materials, have been widely studied as efficient adsorbents for arsenic removal, including when dispersed within porous silica supports. In this study, two head-to-head comparisons were developed to highlight the As(v)-adsorptive ability of meso- and macrostructured silica-based adsorbents. First, the role of the textural properties of a meso-(SBA15) and macrostructured (MOSF) silica support in affecting the structural-morphological features and the adsorption capacity of the active phase (Fe(2)O(3)) have been studied. Secondly, a comparison of the arsenic removal ability of inorganic (Fe(2)O(3)) and organic (amino groups) active phases was carried out on SBA15. Finally, since silica supports are commonly proposed for both environmental and biomedical applications as active phase carriers, we have investigated secondary silicon and iron pollution. The batch tests at different pH revealed better performance from both Fe(2)O(3)-composites at pH 3. The values of q(m) of 7.9 mg g(−1) (53 mg g(act)(−1)) and 5.5 mg g(−1) (37 mg g(act)(−1)) were obtained for SBA15 and MOSF, respectively (g(act) stands for mass of the active phase). The results suggest that mesostructured materials are more suitable for dispersing active phases as adsorbents for water treatment, due to the obtainment of very small Fe(2)O(3) NPs (about 5 nm). Besides studying the influence of the pore size of SBA15 and MOSF on the adsorption process, the impact of the functionalization was analyzed on SBA15 as the most promising sample for As(v)-removal. The amino-functionalized SBA15 adsorbent (3-aminopropyltriethoxysilane, APTES) exhibited a q(m) of 12.4 mg g(−1) and faster kinetics. Furthermore, issues associated with the release of iron and silicon during the sorption process, causing secondary pollution, were evaluated and critically discussed.
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spelling pubmed-94177042022-09-20 Meso- and macroporous silica-based arsenic adsorbents: effect of pore size, nature of the active phase, and silicon release Sanna Angotzi, Marco Mameli, Valentina Cara, Claudio Borchert, Konstantin B. L. Steinbach, Christine Boldt, Regine Schwarz, Dana Cannas, Carla Nanoscale Adv Chemistry Arsenic pollution in ground and drinking water is a major problem worldwide due to the natural abundance of arsenic by dissolution from ground sediment or mining activities from anthropogenic activities. To overcome this issue, iron oxides as low-cost and non-toxic materials, have been widely studied as efficient adsorbents for arsenic removal, including when dispersed within porous silica supports. In this study, two head-to-head comparisons were developed to highlight the As(v)-adsorptive ability of meso- and macrostructured silica-based adsorbents. First, the role of the textural properties of a meso-(SBA15) and macrostructured (MOSF) silica support in affecting the structural-morphological features and the adsorption capacity of the active phase (Fe(2)O(3)) have been studied. Secondly, a comparison of the arsenic removal ability of inorganic (Fe(2)O(3)) and organic (amino groups) active phases was carried out on SBA15. Finally, since silica supports are commonly proposed for both environmental and biomedical applications as active phase carriers, we have investigated secondary silicon and iron pollution. The batch tests at different pH revealed better performance from both Fe(2)O(3)-composites at pH 3. The values of q(m) of 7.9 mg g(−1) (53 mg g(act)(−1)) and 5.5 mg g(−1) (37 mg g(act)(−1)) were obtained for SBA15 and MOSF, respectively (g(act) stands for mass of the active phase). The results suggest that mesostructured materials are more suitable for dispersing active phases as adsorbents for water treatment, due to the obtainment of very small Fe(2)O(3) NPs (about 5 nm). Besides studying the influence of the pore size of SBA15 and MOSF on the adsorption process, the impact of the functionalization was analyzed on SBA15 as the most promising sample for As(v)-removal. The amino-functionalized SBA15 adsorbent (3-aminopropyltriethoxysilane, APTES) exhibited a q(m) of 12.4 mg g(−1) and faster kinetics. Furthermore, issues associated with the release of iron and silicon during the sorption process, causing secondary pollution, were evaluated and critically discussed. RSC 2021-08-27 /pmc/articles/PMC9417704/ /pubmed/36133949 http://dx.doi.org/10.1039/d1na00487e Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Sanna Angotzi, Marco
Mameli, Valentina
Cara, Claudio
Borchert, Konstantin B. L.
Steinbach, Christine
Boldt, Regine
Schwarz, Dana
Cannas, Carla
Meso- and macroporous silica-based arsenic adsorbents: effect of pore size, nature of the active phase, and silicon release
title Meso- and macroporous silica-based arsenic adsorbents: effect of pore size, nature of the active phase, and silicon release
title_full Meso- and macroporous silica-based arsenic adsorbents: effect of pore size, nature of the active phase, and silicon release
title_fullStr Meso- and macroporous silica-based arsenic adsorbents: effect of pore size, nature of the active phase, and silicon release
title_full_unstemmed Meso- and macroporous silica-based arsenic adsorbents: effect of pore size, nature of the active phase, and silicon release
title_short Meso- and macroporous silica-based arsenic adsorbents: effect of pore size, nature of the active phase, and silicon release
title_sort meso- and macroporous silica-based arsenic adsorbents: effect of pore size, nature of the active phase, and silicon release
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9417704/
https://www.ncbi.nlm.nih.gov/pubmed/36133949
http://dx.doi.org/10.1039/d1na00487e
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