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The Influence of Salt Anions on Heavy Metal Ion Adsorption on the Example of Nickel
The biodegradable polysaccharide chitosan possesses protonated and natural amino groups at medium pH values and has therefore been used as an adsorbing material for nickel salts in water treatment. Nickel is a problematic heavy metal ion which can cause various diseases and disorders in living organ...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5872952/ https://www.ncbi.nlm.nih.gov/pubmed/29510485 http://dx.doi.org/10.3390/ma11030373 |
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author | Mende, Mandy Schwarz, Dana Steinbach, Christine Boldt, Regine Schwarz, Simona |
author_facet | Mende, Mandy Schwarz, Dana Steinbach, Christine Boldt, Regine Schwarz, Simona |
author_sort | Mende, Mandy |
collection | PubMed |
description | The biodegradable polysaccharide chitosan possesses protonated and natural amino groups at medium pH values and has therefore been used as an adsorbing material for nickel salts in water treatment. Nickel is a problematic heavy metal ion which can cause various diseases and disorders in living organisms. Here, we show the influence of oxyanions (e.g., nitrate and sulfate) to the adsorption of nickel ions. Hence, simultaneously we are addressing the increasing global problem of nitrate and sulfate ion pollution in groundwater and surface water. A series of adsorption experiments was carried out in order to determine (i) the adsorption equilibrium, (ii) the adsorption capacity in dependence on the initial nickel ion concentration, and (iii) the influence of the anion presented in solution for the adsorption capacity. Surface morphology of chitosan flakes before and after the adsorption process has been studied with SEM-EDX analysis. The chitosan flakes exhibited promising adsorption capacities of 81.9 mg·g(−1) and 21.2 mg·g(−1) for nickel (sulfate) and nickel (nitrate), respectively. The calculated values of Gibbs free energy change ΔG(0) confirm the higher adsorption of nickel ions in presence of sulfate ions. Hence, higher anion valence leads to a higher adsorption capacity. |
format | Online Article Text |
id | pubmed-5872952 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-58729522018-03-30 The Influence of Salt Anions on Heavy Metal Ion Adsorption on the Example of Nickel Mende, Mandy Schwarz, Dana Steinbach, Christine Boldt, Regine Schwarz, Simona Materials (Basel) Article The biodegradable polysaccharide chitosan possesses protonated and natural amino groups at medium pH values and has therefore been used as an adsorbing material for nickel salts in water treatment. Nickel is a problematic heavy metal ion which can cause various diseases and disorders in living organisms. Here, we show the influence of oxyanions (e.g., nitrate and sulfate) to the adsorption of nickel ions. Hence, simultaneously we are addressing the increasing global problem of nitrate and sulfate ion pollution in groundwater and surface water. A series of adsorption experiments was carried out in order to determine (i) the adsorption equilibrium, (ii) the adsorption capacity in dependence on the initial nickel ion concentration, and (iii) the influence of the anion presented in solution for the adsorption capacity. Surface morphology of chitosan flakes before and after the adsorption process has been studied with SEM-EDX analysis. The chitosan flakes exhibited promising adsorption capacities of 81.9 mg·g(−1) and 21.2 mg·g(−1) for nickel (sulfate) and nickel (nitrate), respectively. The calculated values of Gibbs free energy change ΔG(0) confirm the higher adsorption of nickel ions in presence of sulfate ions. Hence, higher anion valence leads to a higher adsorption capacity. MDPI 2018-03-03 /pmc/articles/PMC5872952/ /pubmed/29510485 http://dx.doi.org/10.3390/ma11030373 Text en © 2018 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 Mende, Mandy Schwarz, Dana Steinbach, Christine Boldt, Regine Schwarz, Simona The Influence of Salt Anions on Heavy Metal Ion Adsorption on the Example of Nickel |
title | The Influence of Salt Anions on Heavy Metal Ion Adsorption on the Example of Nickel |
title_full | The Influence of Salt Anions on Heavy Metal Ion Adsorption on the Example of Nickel |
title_fullStr | The Influence of Salt Anions on Heavy Metal Ion Adsorption on the Example of Nickel |
title_full_unstemmed | The Influence of Salt Anions on Heavy Metal Ion Adsorption on the Example of Nickel |
title_short | The Influence of Salt Anions on Heavy Metal Ion Adsorption on the Example of Nickel |
title_sort | influence of salt anions on heavy metal ion adsorption on the example of nickel |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5872952/ https://www.ncbi.nlm.nih.gov/pubmed/29510485 http://dx.doi.org/10.3390/ma11030373 |
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