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Gallic acid-functionalized graphene hydrogel as adsorbent for removal of chromium (iii) and organic dye pollutants from tannery wastewater

The pollution caused by tannery wastewater containing high concentrations of trivalent chromium ions [Cr(iii)] and organic dyes has severely restricted the sustainable development of the leather industry. To address this problem, a three-dimensional (3D) porous graphene-based hydrogel with good mech...

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Detalles Bibliográficos
Autores principales: Liu, Gongyan, Yu, Ruiquan, Lan, Tianxiang, Liu, Zheng, Zhang, Peng, Liang, Ruifeng
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/PMC9070501/
https://www.ncbi.nlm.nih.gov/pubmed/35528580
http://dx.doi.org/10.1039/c9ra05664e
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author Liu, Gongyan
Yu, Ruiquan
Lan, Tianxiang
Liu, Zheng
Zhang, Peng
Liang, Ruifeng
author_facet Liu, Gongyan
Yu, Ruiquan
Lan, Tianxiang
Liu, Zheng
Zhang, Peng
Liang, Ruifeng
author_sort Liu, Gongyan
collection PubMed
description The pollution caused by tannery wastewater containing high concentrations of trivalent chromium ions [Cr(iii)] and organic dyes has severely restricted the sustainable development of the leather industry. To address this problem, a three-dimensional (3D) porous graphene-based hydrogel with good mechanical strength and large surface area was fabricated by self-assembly of graphene oxide (GO) sheets reduced and modified by gallic acid (GA) through π–π interactions. As an adsorbent, this GA-functionalized graphene hydrogel (GA-GH) can effectively capture Cr(iii) by coordination complexation between Cr(iii) and deprotonated carboxylic groups of GA at pH ∼ 4.0. Moreover, GA-GH could be easily regenerated by desorption of adsorbed Cr(iii) at pH 2.0 and maintained its high adsorption capacity after multiple adsorption–desorption cycles, which was also helpful for reusing desorbed Cr(iii) as tanning agent. In addition, compared with a graphene hydrogel (GH) without modification by GA, adsorption capacity of GA-GH for organic dye was significantly improved due to the enhanced π–π interactions between the GA-GH and aromatic dyes.
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spelling pubmed-90705012022-05-05 Gallic acid-functionalized graphene hydrogel as adsorbent for removal of chromium (iii) and organic dye pollutants from tannery wastewater Liu, Gongyan Yu, Ruiquan Lan, Tianxiang Liu, Zheng Zhang, Peng Liang, Ruifeng RSC Adv Chemistry The pollution caused by tannery wastewater containing high concentrations of trivalent chromium ions [Cr(iii)] and organic dyes has severely restricted the sustainable development of the leather industry. To address this problem, a three-dimensional (3D) porous graphene-based hydrogel with good mechanical strength and large surface area was fabricated by self-assembly of graphene oxide (GO) sheets reduced and modified by gallic acid (GA) through π–π interactions. As an adsorbent, this GA-functionalized graphene hydrogel (GA-GH) can effectively capture Cr(iii) by coordination complexation between Cr(iii) and deprotonated carboxylic groups of GA at pH ∼ 4.0. Moreover, GA-GH could be easily regenerated by desorption of adsorbed Cr(iii) at pH 2.0 and maintained its high adsorption capacity after multiple adsorption–desorption cycles, which was also helpful for reusing desorbed Cr(iii) as tanning agent. In addition, compared with a graphene hydrogel (GH) without modification by GA, adsorption capacity of GA-GH for organic dye was significantly improved due to the enhanced π–π interactions between the GA-GH and aromatic dyes. The Royal Society of Chemistry 2019-08-29 /pmc/articles/PMC9070501/ /pubmed/35528580 http://dx.doi.org/10.1039/c9ra05664e Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Liu, Gongyan
Yu, Ruiquan
Lan, Tianxiang
Liu, Zheng
Zhang, Peng
Liang, Ruifeng
Gallic acid-functionalized graphene hydrogel as adsorbent for removal of chromium (iii) and organic dye pollutants from tannery wastewater
title Gallic acid-functionalized graphene hydrogel as adsorbent for removal of chromium (iii) and organic dye pollutants from tannery wastewater
title_full Gallic acid-functionalized graphene hydrogel as adsorbent for removal of chromium (iii) and organic dye pollutants from tannery wastewater
title_fullStr Gallic acid-functionalized graphene hydrogel as adsorbent for removal of chromium (iii) and organic dye pollutants from tannery wastewater
title_full_unstemmed Gallic acid-functionalized graphene hydrogel as adsorbent for removal of chromium (iii) and organic dye pollutants from tannery wastewater
title_short Gallic acid-functionalized graphene hydrogel as adsorbent for removal of chromium (iii) and organic dye pollutants from tannery wastewater
title_sort gallic acid-functionalized graphene hydrogel as adsorbent for removal of chromium (iii) and organic dye pollutants from tannery wastewater
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9070501/
https://www.ncbi.nlm.nih.gov/pubmed/35528580
http://dx.doi.org/10.1039/c9ra05664e
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