Crosslinked hydrogels of polyethylenimine and graphene oxide to treat Cr(VI) contaminated wastewater

Hemant Mittal; Ali Al Alili; Pranay P. Morajkar; Saeed M. Alhassan

doi:10.1016/j.colsurfa.2021.127533

Crosslinked hydrogels of polyethylenimine and graphene oxide to treat Cr(VI) contaminated wastewater

Hemant Mittal, Ali Al Alili, Pranay P. Morajkar, Saeed M. Alhassan

Chemical and Petroleum Engineering

Goa University

Research output: Contribution to journal › Article › peer-review

27 Scopus citations

Abstract

This research papers reports the synthesis of graphene oxide (GO) and polyethylenimine (PEI) based crosslinked nanocomposite hydrogels (GO/PEI-NCH) for its application as potential adsorbent to treat Cr(VI) polluted water. To synthesize GO/PEI-NCH, graphene oxide was initially amine functionalized using 3-aminopropyltriethoxysilane (APTES) which was subsequently grafted with PEI. Successful functionalization of GO with APTES and the crosslinked hydrogel network formation was evidenced by characterizing samples using SEM, X-ray diffraction, Raman, FTIR and TGA. Approximately 97% Cr(VI) was adsorbed from the chromium solution of 50 mg/L concentration at pH 2 with 0.5 g/L mass of GO/PEI-NCH. Further, adsorption isotherm correlated well with Langmuir model and predicted homogenous monolayer adsorption with the adsorbent having energetically identical binding sites. GO/PEI-NCH exhibited 443.8 mg/g maximum adsorption capacity for Cr(VI). Adsorption kinetics was well defined using pseudo-second-order model. GO/PEI-NCH could be easily and efficiently regenerated using HCl solution and it exhibited good stability and reusability for ten continuous adsorption-desorption cycles. Therefore, GO/PEI-NCH is a promising candidate to treat Cr(VI) ions contaminated wastewater.

Original language	British English
Article number	127533
Journal	Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume	630
DOIs	https://doi.org/10.1016/j.colsurfa.2021.127533
State	Published - 5 Dec 2021

Keywords

Adsorption isotherm
Adsorption kinetics
Hydrogel nanocomposites
Polyethylenimine

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.colsurfa.2021.127533

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title = "Crosslinked hydrogels of polyethylenimine and graphene oxide to treat Cr(VI) contaminated wastewater",

abstract = "This research papers reports the synthesis of graphene oxide (GO) and polyethylenimine (PEI) based crosslinked nanocomposite hydrogels (GO/PEI-NCH) for its application as potential adsorbent to treat Cr(VI) polluted water. To synthesize GO/PEI-NCH, graphene oxide was initially amine functionalized using 3-aminopropyltriethoxysilane (APTES) which was subsequently grafted with PEI. Successful functionalization of GO with APTES and the crosslinked hydrogel network formation was evidenced by characterizing samples using SEM, X-ray diffraction, Raman, FTIR and TGA. Approximately 97% Cr(VI) was adsorbed from the chromium solution of 50 mg/L concentration at pH 2 with 0.5 g/L mass of GO/PEI-NCH. Further, adsorption isotherm correlated well with Langmuir model and predicted homogenous monolayer adsorption with the adsorbent having energetically identical binding sites. GO/PEI-NCH exhibited 443.8 mg/g maximum adsorption capacity for Cr(VI). Adsorption kinetics was well defined using pseudo-second-order model. GO/PEI-NCH could be easily and efficiently regenerated using HCl solution and it exhibited good stability and reusability for ten continuous adsorption-desorption cycles. Therefore, GO/PEI-NCH is a promising candidate to treat Cr(VI) ions contaminated wastewater.",

keywords = "Adsorption isotherm, Adsorption kinetics, Hydrogel nanocomposites, Polyethylenimine",

author = "Hemant Mittal and {Al Alili}, Ali and Morajkar, {Pranay P.} and Alhassan, {Saeed M.}",

note = "Funding Information: This publication is based upon work supported by the Khalifa University of Science and Technology under Award no. CIRA-2018-78 . Publisher Copyright: {\textcopyright} 2021 Elsevier B.V.",

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doi = "10.1016/j.colsurfa.2021.127533",

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AU - Mittal, Hemant

AU - Al Alili, Ali

AU - Morajkar, Pranay P.

AU - Alhassan, Saeed M.

PY - 2021/12/5

Y1 - 2021/12/5

N2 - This research papers reports the synthesis of graphene oxide (GO) and polyethylenimine (PEI) based crosslinked nanocomposite hydrogels (GO/PEI-NCH) for its application as potential adsorbent to treat Cr(VI) polluted water. To synthesize GO/PEI-NCH, graphene oxide was initially amine functionalized using 3-aminopropyltriethoxysilane (APTES) which was subsequently grafted with PEI. Successful functionalization of GO with APTES and the crosslinked hydrogel network formation was evidenced by characterizing samples using SEM, X-ray diffraction, Raman, FTIR and TGA. Approximately 97% Cr(VI) was adsorbed from the chromium solution of 50 mg/L concentration at pH 2 with 0.5 g/L mass of GO/PEI-NCH. Further, adsorption isotherm correlated well with Langmuir model and predicted homogenous monolayer adsorption with the adsorbent having energetically identical binding sites. GO/PEI-NCH exhibited 443.8 mg/g maximum adsorption capacity for Cr(VI). Adsorption kinetics was well defined using pseudo-second-order model. GO/PEI-NCH could be easily and efficiently regenerated using HCl solution and it exhibited good stability and reusability for ten continuous adsorption-desorption cycles. Therefore, GO/PEI-NCH is a promising candidate to treat Cr(VI) ions contaminated wastewater.

AB - This research papers reports the synthesis of graphene oxide (GO) and polyethylenimine (PEI) based crosslinked nanocomposite hydrogels (GO/PEI-NCH) for its application as potential adsorbent to treat Cr(VI) polluted water. To synthesize GO/PEI-NCH, graphene oxide was initially amine functionalized using 3-aminopropyltriethoxysilane (APTES) which was subsequently grafted with PEI. Successful functionalization of GO with APTES and the crosslinked hydrogel network formation was evidenced by characterizing samples using SEM, X-ray diffraction, Raman, FTIR and TGA. Approximately 97% Cr(VI) was adsorbed from the chromium solution of 50 mg/L concentration at pH 2 with 0.5 g/L mass of GO/PEI-NCH. Further, adsorption isotherm correlated well with Langmuir model and predicted homogenous monolayer adsorption with the adsorbent having energetically identical binding sites. GO/PEI-NCH exhibited 443.8 mg/g maximum adsorption capacity for Cr(VI). Adsorption kinetics was well defined using pseudo-second-order model. GO/PEI-NCH could be easily and efficiently regenerated using HCl solution and it exhibited good stability and reusability for ten continuous adsorption-desorption cycles. Therefore, GO/PEI-NCH is a promising candidate to treat Cr(VI) ions contaminated wastewater.

KW - Adsorption isotherm

KW - Adsorption kinetics

KW - Hydrogel nanocomposites

KW - Polyethylenimine

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Crosslinked hydrogels of polyethylenimine and graphene oxide to treat Cr(VI) contaminated wastewater

Abstract

Keywords

UN SDGs

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