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Superior Heavy Metal Ion Adsorption Capacity in Aqueous Solution by High-Density Thiol-Functionalized Reduced Graphene Oxides

The preparation of mercapto-reduced graphene oxides (m-RGOs) via a solvothermal reaction using P(4)S(10) as a thionating agent has demonstrated their potential as an absorbent for scavenging heavy metal ions, particularly Pb(2+), from aqueous solutions due to the presence of thiol (–SH) functional g...

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Autores principales: Kim, Ho-Geun, Bae, Jong-Seong, Hwang, Injoo, Kim, Sung-Hoon, Jeon, Ki-Wan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10220523/
https://www.ncbi.nlm.nih.gov/pubmed/37241739
http://dx.doi.org/10.3390/molecules28103998
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author Kim, Ho-Geun
Bae, Jong-Seong
Hwang, Injoo
Kim, Sung-Hoon
Jeon, Ki-Wan
author_facet Kim, Ho-Geun
Bae, Jong-Seong
Hwang, Injoo
Kim, Sung-Hoon
Jeon, Ki-Wan
author_sort Kim, Ho-Geun
collection PubMed
description The preparation of mercapto-reduced graphene oxides (m-RGOs) via a solvothermal reaction using P(4)S(10) as a thionating agent has demonstrated their potential as an absorbent for scavenging heavy metal ions, particularly Pb(2+), from aqueous solutions due to the presence of thiol (–SH) functional groups on their surface. The structural and elemental analysis of m-RGOs was conducted using a range of techniques, including X-ray diffraction (XRD), Raman spectroscopy, optical microscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), scanning transmission electron microscopy equipped with energy-dispersive spectroscopy (STEM-EDS), and X-ray photoelectron spectroscopy (XPS). At pH 7 and 25 °C, the maximum adsorption capacity of Pb(2+) ions on the surface of m-RGOs was determined to be approximately 858 mg/g. The heavy metal–S binding energies were used to determine the percent removal of the tested heavy metal ions, with Pb(2+) exhibiting the highest percentage removal, followed by Hg(2+) and Cd(2+) ions having the lowest percent removal, and the binding energies observed were Pb–S at 346 kJ/mol, Hg–S at 217 kJ/mol, and Cd–S at 208 kJ/mol. The time-dependent removal study of Pb(2+) ions also yielded promising results, with almost 98% of Pb(2+) ions being removed within 30 min at pH 7 and 25 °C using a 1 ppm Pb(2+) solution as the test solution. The findings of this study clearly demonstrate the potential and efficiency of thiol-functionalized carbonaceous material for the removal of environmentally harmful Pb(2+) from groundwater.
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spelling pubmed-102205232023-05-28 Superior Heavy Metal Ion Adsorption Capacity in Aqueous Solution by High-Density Thiol-Functionalized Reduced Graphene Oxides Kim, Ho-Geun Bae, Jong-Seong Hwang, Injoo Kim, Sung-Hoon Jeon, Ki-Wan Molecules Article The preparation of mercapto-reduced graphene oxides (m-RGOs) via a solvothermal reaction using P(4)S(10) as a thionating agent has demonstrated their potential as an absorbent for scavenging heavy metal ions, particularly Pb(2+), from aqueous solutions due to the presence of thiol (–SH) functional groups on their surface. The structural and elemental analysis of m-RGOs was conducted using a range of techniques, including X-ray diffraction (XRD), Raman spectroscopy, optical microscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), scanning transmission electron microscopy equipped with energy-dispersive spectroscopy (STEM-EDS), and X-ray photoelectron spectroscopy (XPS). At pH 7 and 25 °C, the maximum adsorption capacity of Pb(2+) ions on the surface of m-RGOs was determined to be approximately 858 mg/g. The heavy metal–S binding energies were used to determine the percent removal of the tested heavy metal ions, with Pb(2+) exhibiting the highest percentage removal, followed by Hg(2+) and Cd(2+) ions having the lowest percent removal, and the binding energies observed were Pb–S at 346 kJ/mol, Hg–S at 217 kJ/mol, and Cd–S at 208 kJ/mol. The time-dependent removal study of Pb(2+) ions also yielded promising results, with almost 98% of Pb(2+) ions being removed within 30 min at pH 7 and 25 °C using a 1 ppm Pb(2+) solution as the test solution. The findings of this study clearly demonstrate the potential and efficiency of thiol-functionalized carbonaceous material for the removal of environmentally harmful Pb(2+) from groundwater. MDPI 2023-05-10 /pmc/articles/PMC10220523/ /pubmed/37241739 http://dx.doi.org/10.3390/molecules28103998 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
Kim, Ho-Geun
Bae, Jong-Seong
Hwang, Injoo
Kim, Sung-Hoon
Jeon, Ki-Wan
Superior Heavy Metal Ion Adsorption Capacity in Aqueous Solution by High-Density Thiol-Functionalized Reduced Graphene Oxides
title Superior Heavy Metal Ion Adsorption Capacity in Aqueous Solution by High-Density Thiol-Functionalized Reduced Graphene Oxides
title_full Superior Heavy Metal Ion Adsorption Capacity in Aqueous Solution by High-Density Thiol-Functionalized Reduced Graphene Oxides
title_fullStr Superior Heavy Metal Ion Adsorption Capacity in Aqueous Solution by High-Density Thiol-Functionalized Reduced Graphene Oxides
title_full_unstemmed Superior Heavy Metal Ion Adsorption Capacity in Aqueous Solution by High-Density Thiol-Functionalized Reduced Graphene Oxides
title_short Superior Heavy Metal Ion Adsorption Capacity in Aqueous Solution by High-Density Thiol-Functionalized Reduced Graphene Oxides
title_sort superior heavy metal ion adsorption capacity in aqueous solution by high-density thiol-functionalized reduced graphene oxides
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10220523/
https://www.ncbi.nlm.nih.gov/pubmed/37241739
http://dx.doi.org/10.3390/molecules28103998
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