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Utilization of chemically treated cashew-nut shell as potential adsorbent for removal of Pb(II) ions from aqueous solution
In this study, cashew nut shells (CNS), waste from a cashew nut processing factory, have been used as an adsorbent for Pb(II) ions in water. Treatments of CNS with 1 M of H(2)SO(4), HNO(3,) and NaOH solutions were performed to modify their surfaces and improve their adsorption capacities. Characteri...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7039912/ https://www.ncbi.nlm.nih.gov/pubmed/32094375 http://dx.doi.org/10.1038/s41598-020-60161-9 |
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author | Nuithitikul, Kamchai Phromrak, Rapeeporn Saengngoen, Wikanda |
author_facet | Nuithitikul, Kamchai Phromrak, Rapeeporn Saengngoen, Wikanda |
author_sort | Nuithitikul, Kamchai |
collection | PubMed |
description | In this study, cashew nut shells (CNS), waste from a cashew nut processing factory, have been used as an adsorbent for Pb(II) ions in water. Treatments of CNS with 1 M of H(2)SO(4), HNO(3,) and NaOH solutions were performed to modify their surfaces and improve their adsorption capacities. Characterization of untreated and chemical-treated CNS was carried out using nitrogen adsorption isotherm, elemental (CHN) analysis, Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) equipped with energy dispersive X-ray analysis (EDX). In the study of Pb(II) removal, various models of adsorption kinetics and isotherms were evaluated against the experimental data. The results showed that H(2)SO(4)-treated CNS exhibited the highest adsorption capacity. The chemical treatment removes impurities, alters the surface functional groups and improves specific surface areas and pore volumes of native CNS significantly. Surface adsorption and intra-particle diffusion steps were found to substantially affect the overall adsorption process of Pb(II) on H(2)SO(4)-treated CNS. Owing to its easy preparation and comparable adsorption capacity, H(2)SO(4)-treated CNS has the potential to be developed as a low-cost adsorbent for the removal of Pb(II) from contaminated water. |
format | Online Article Text |
id | pubmed-7039912 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-70399122020-02-28 Utilization of chemically treated cashew-nut shell as potential adsorbent for removal of Pb(II) ions from aqueous solution Nuithitikul, Kamchai Phromrak, Rapeeporn Saengngoen, Wikanda Sci Rep Article In this study, cashew nut shells (CNS), waste from a cashew nut processing factory, have been used as an adsorbent for Pb(II) ions in water. Treatments of CNS with 1 M of H(2)SO(4), HNO(3,) and NaOH solutions were performed to modify their surfaces and improve their adsorption capacities. Characterization of untreated and chemical-treated CNS was carried out using nitrogen adsorption isotherm, elemental (CHN) analysis, Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) equipped with energy dispersive X-ray analysis (EDX). In the study of Pb(II) removal, various models of adsorption kinetics and isotherms were evaluated against the experimental data. The results showed that H(2)SO(4)-treated CNS exhibited the highest adsorption capacity. The chemical treatment removes impurities, alters the surface functional groups and improves specific surface areas and pore volumes of native CNS significantly. Surface adsorption and intra-particle diffusion steps were found to substantially affect the overall adsorption process of Pb(II) on H(2)SO(4)-treated CNS. Owing to its easy preparation and comparable adsorption capacity, H(2)SO(4)-treated CNS has the potential to be developed as a low-cost adsorbent for the removal of Pb(II) from contaminated water. Nature Publishing Group UK 2020-02-24 /pmc/articles/PMC7039912/ /pubmed/32094375 http://dx.doi.org/10.1038/s41598-020-60161-9 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Nuithitikul, Kamchai Phromrak, Rapeeporn Saengngoen, Wikanda Utilization of chemically treated cashew-nut shell as potential adsorbent for removal of Pb(II) ions from aqueous solution |
title | Utilization of chemically treated cashew-nut shell as potential adsorbent for removal of Pb(II) ions from aqueous solution |
title_full | Utilization of chemically treated cashew-nut shell as potential adsorbent for removal of Pb(II) ions from aqueous solution |
title_fullStr | Utilization of chemically treated cashew-nut shell as potential adsorbent for removal of Pb(II) ions from aqueous solution |
title_full_unstemmed | Utilization of chemically treated cashew-nut shell as potential adsorbent for removal of Pb(II) ions from aqueous solution |
title_short | Utilization of chemically treated cashew-nut shell as potential adsorbent for removal of Pb(II) ions from aqueous solution |
title_sort | utilization of chemically treated cashew-nut shell as potential adsorbent for removal of pb(ii) ions from aqueous solution |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7039912/ https://www.ncbi.nlm.nih.gov/pubmed/32094375 http://dx.doi.org/10.1038/s41598-020-60161-9 |
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