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A green l-cysteine modified cellulose nanocrystals biosorbent for adsorption of mercury ions from aqueous solutions

Using a green biosorbent to remove toxic mercury ions from aqueous solutions is a significant undertaking. In the present study, a novel biosorbent, l-cysteine modified cellulose nanocrystals (Lcys-CNCs), was prepared by functionalizing high surface area cellulose nanocrystals with l-cysteine throug...

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Detalles Bibliográficos
Autores principales: Li, Weixue, Ju, Benzhi, Zhang, Shufen
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9061121/
https://www.ncbi.nlm.nih.gov/pubmed/35518471
http://dx.doi.org/10.1039/c9ra00048h
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author Li, Weixue
Ju, Benzhi
Zhang, Shufen
author_facet Li, Weixue
Ju, Benzhi
Zhang, Shufen
author_sort Li, Weixue
collection PubMed
description Using a green biosorbent to remove toxic mercury ions from aqueous solutions is a significant undertaking. In the present study, a novel biosorbent, l-cysteine modified cellulose nanocrystals (Lcys-CNCs), was prepared by functionalizing high surface area cellulose nanocrystals with l-cysteine through periodate oxidation and reductive amination reaction. Lcys-CNCs were characterized by FT-IR, (13)C CP-MAS NMR, elemental analysis, XPS, zeta potential and SEM. As cellulose nanocrystals are the natural nanomaterial, and l-cysteine contains strong mercury chelating groups, Lcys-CNCs show excellent adsorption capacity for mercury ions. The experimental conditions such as pH, contact time, and initial mercury ion concentration are discussed. The pseudo-second order model can describe the removal kinetics of Hg(ii) more accurately than the pseudo-first order model. The adsorption isotherm study of Hg(ii) followed the Langmuir model of monolayer adsorption. The maximum uptake capacity of Lcys-CNCs was determined to be 923 mg g(−1). Lcys-CNCs can remove mercury ions with 93% removal efficiency within 5 min from a 71 mg L(−1) solution. For Cd(ii), Pb(ii), Cu(ii) and Zn(ii) ions, Lcsy-CNCs can selectively adsorb Hg(ii) ions and the removal efficiency is 87.4% for Hg(ii). This study suggests Lcsy-CNCs are a green and highly efficient biosorbent for adsorption of mercury ions from aqueous solutions.
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spelling pubmed-90611212022-05-04 A green l-cysteine modified cellulose nanocrystals biosorbent for adsorption of mercury ions from aqueous solutions Li, Weixue Ju, Benzhi Zhang, Shufen RSC Adv Chemistry Using a green biosorbent to remove toxic mercury ions from aqueous solutions is a significant undertaking. In the present study, a novel biosorbent, l-cysteine modified cellulose nanocrystals (Lcys-CNCs), was prepared by functionalizing high surface area cellulose nanocrystals with l-cysteine through periodate oxidation and reductive amination reaction. Lcys-CNCs were characterized by FT-IR, (13)C CP-MAS NMR, elemental analysis, XPS, zeta potential and SEM. As cellulose nanocrystals are the natural nanomaterial, and l-cysteine contains strong mercury chelating groups, Lcys-CNCs show excellent adsorption capacity for mercury ions. The experimental conditions such as pH, contact time, and initial mercury ion concentration are discussed. The pseudo-second order model can describe the removal kinetics of Hg(ii) more accurately than the pseudo-first order model. The adsorption isotherm study of Hg(ii) followed the Langmuir model of monolayer adsorption. The maximum uptake capacity of Lcys-CNCs was determined to be 923 mg g(−1). Lcys-CNCs can remove mercury ions with 93% removal efficiency within 5 min from a 71 mg L(−1) solution. For Cd(ii), Pb(ii), Cu(ii) and Zn(ii) ions, Lcsy-CNCs can selectively adsorb Hg(ii) ions and the removal efficiency is 87.4% for Hg(ii). This study suggests Lcsy-CNCs are a green and highly efficient biosorbent for adsorption of mercury ions from aqueous solutions. The Royal Society of Chemistry 2019-03-01 /pmc/articles/PMC9061121/ /pubmed/35518471 http://dx.doi.org/10.1039/c9ra00048h Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Li, Weixue
Ju, Benzhi
Zhang, Shufen
A green l-cysteine modified cellulose nanocrystals biosorbent for adsorption of mercury ions from aqueous solutions
title A green l-cysteine modified cellulose nanocrystals biosorbent for adsorption of mercury ions from aqueous solutions
title_full A green l-cysteine modified cellulose nanocrystals biosorbent for adsorption of mercury ions from aqueous solutions
title_fullStr A green l-cysteine modified cellulose nanocrystals biosorbent for adsorption of mercury ions from aqueous solutions
title_full_unstemmed A green l-cysteine modified cellulose nanocrystals biosorbent for adsorption of mercury ions from aqueous solutions
title_short A green l-cysteine modified cellulose nanocrystals biosorbent for adsorption of mercury ions from aqueous solutions
title_sort green l-cysteine modified cellulose nanocrystals biosorbent for adsorption of mercury ions from aqueous solutions
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9061121/
https://www.ncbi.nlm.nih.gov/pubmed/35518471
http://dx.doi.org/10.1039/c9ra00048h
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