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Thermochemical study of Cr(VI) sequestration onto chemically modified Areca catechu and its recovery by desorptive precipitation method

A new biosorbent for Cr(VI) sequestration was investigated from betel nut waste (BNW), Areca catechu, by H(2)SO(4) charring. Aqueous insolubility and Cr(VI) uptake capacity of native BNW were potentially improved after H(2)SO(4) modification due to cross-linking reaction of betel nut cellulose, ther...

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Autores principales: Basnet, Prabin, Ojha, Pawan Kumar, Gyawali, Deepak, Ghimire, Kedar Nath, Paudyal, Hari
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9449776/
https://www.ncbi.nlm.nih.gov/pubmed/36090219
http://dx.doi.org/10.1016/j.heliyon.2022.e10305
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author Basnet, Prabin
Ojha, Pawan Kumar
Gyawali, Deepak
Ghimire, Kedar Nath
Paudyal, Hari
author_facet Basnet, Prabin
Ojha, Pawan Kumar
Gyawali, Deepak
Ghimire, Kedar Nath
Paudyal, Hari
author_sort Basnet, Prabin
collection PubMed
description A new biosorbent for Cr(VI) sequestration was investigated from betel nut waste (BNW), Areca catechu, by H(2)SO(4) charring. Aqueous insolubility and Cr(VI) uptake capacity of native BNW were potentially improved after H(2)SO(4) modification due to cross-linking reaction of betel nut cellulose, thereby creating suitable complexation sites for Cr(VI) ion removal. Langmuir isotherm and pseudo second order (PSO) kinetic models described well with the experimental data. A trace amount of Cr(VI) was effectively removed below the safe drinking water standard (WHO, 0.05 mg/L) using charred BNW (CBNW). The negative value of ΔG° evaluated for all the temperatures suggested the spontaneous nature of Cr(VI) sequestration and positive value of ΔH° (42.43±0.13 kJ/mol) confirmed an endothermic reaction. Co-existing NO [Formula: see text] , Cl(−), Na(+) and Zn(2+) ions showed negligible interferences, whereas SO [Formula: see text] and PO [Formula: see text] notably reduced Cr(VI) uptake capacity of CBNW. More than 98% of adsorbed Cr(VI) was desorbed using 1M NaOH solution. A light yellow precipitate of BaCrO(4) was recovered from the desorbed solution after precipitation with BaCl(2) solution. Therefore, the CBNW biosorbent investigated in this work is expected to be a promising material for Cr(VI) sequestration and its recovery from polluted water.
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spelling pubmed-94497762022-09-08 Thermochemical study of Cr(VI) sequestration onto chemically modified Areca catechu and its recovery by desorptive precipitation method Basnet, Prabin Ojha, Pawan Kumar Gyawali, Deepak Ghimire, Kedar Nath Paudyal, Hari Heliyon Research Article A new biosorbent for Cr(VI) sequestration was investigated from betel nut waste (BNW), Areca catechu, by H(2)SO(4) charring. Aqueous insolubility and Cr(VI) uptake capacity of native BNW were potentially improved after H(2)SO(4) modification due to cross-linking reaction of betel nut cellulose, thereby creating suitable complexation sites for Cr(VI) ion removal. Langmuir isotherm and pseudo second order (PSO) kinetic models described well with the experimental data. A trace amount of Cr(VI) was effectively removed below the safe drinking water standard (WHO, 0.05 mg/L) using charred BNW (CBNW). The negative value of ΔG° evaluated for all the temperatures suggested the spontaneous nature of Cr(VI) sequestration and positive value of ΔH° (42.43±0.13 kJ/mol) confirmed an endothermic reaction. Co-existing NO [Formula: see text] , Cl(−), Na(+) and Zn(2+) ions showed negligible interferences, whereas SO [Formula: see text] and PO [Formula: see text] notably reduced Cr(VI) uptake capacity of CBNW. More than 98% of adsorbed Cr(VI) was desorbed using 1M NaOH solution. A light yellow precipitate of BaCrO(4) was recovered from the desorbed solution after precipitation with BaCl(2) solution. Therefore, the CBNW biosorbent investigated in this work is expected to be a promising material for Cr(VI) sequestration and its recovery from polluted water. Elsevier 2022-08-28 /pmc/articles/PMC9449776/ /pubmed/36090219 http://dx.doi.org/10.1016/j.heliyon.2022.e10305 Text en © 2022 The Author(s) https://creativecommons.org/licenses/by-nc-nd/4.0/This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Research Article
Basnet, Prabin
Ojha, Pawan Kumar
Gyawali, Deepak
Ghimire, Kedar Nath
Paudyal, Hari
Thermochemical study of Cr(VI) sequestration onto chemically modified Areca catechu and its recovery by desorptive precipitation method
title Thermochemical study of Cr(VI) sequestration onto chemically modified Areca catechu and its recovery by desorptive precipitation method
title_full Thermochemical study of Cr(VI) sequestration onto chemically modified Areca catechu and its recovery by desorptive precipitation method
title_fullStr Thermochemical study of Cr(VI) sequestration onto chemically modified Areca catechu and its recovery by desorptive precipitation method
title_full_unstemmed Thermochemical study of Cr(VI) sequestration onto chemically modified Areca catechu and its recovery by desorptive precipitation method
title_short Thermochemical study of Cr(VI) sequestration onto chemically modified Areca catechu and its recovery by desorptive precipitation method
title_sort thermochemical study of cr(vi) sequestration onto chemically modified areca catechu and its recovery by desorptive precipitation method
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9449776/
https://www.ncbi.nlm.nih.gov/pubmed/36090219
http://dx.doi.org/10.1016/j.heliyon.2022.e10305
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