Bio-waste assisted phase transformation of Fe3O4/carbon to nZVI/graphene composites and its application in reductive elimination of Cr(VI) removal from aquifer

Phyu Mon, Phyu and Phyu Cho, Phyu and Chanadana, L. and Thatikonda, Shashidhar and Madras, Giridhar and Subrahmanyam, Challapalli and et al, . (2023) Bio-waste assisted phase transformation of Fe3O4/carbon to nZVI/graphene composites and its application in reductive elimination of Cr(VI) removal from aquifer. Separation and Purification Technology, 306 (122632). pp. 1-11. ISSN 1383-5866

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Abstract

This paper reports a facile approach for the synthesis of graphene stabilised zero valent iron (nZVI) via carbothermal reduction method using bio-waste materials. X-ray photoelectron spectroscopy confirmed the formation of nZVI, which was further supported by magnetic susceptibility measurements. The process of Cr(VI) removal was revealed by analysing nZVI/graphene before and after the Cr(VI) adsorption process. nZVI/graphene reduces Cr(VI) to Cr(III), which was adsorbed on the graphene sheet, avoiding the passivation of nZVI. Graphene provides good electrical conductivity, skeletal support, and has long-term electron releasing characteristics, which can accelerate the reduction of Cr(VI) to Cr(III) and demonstrates a quick and high removal capacity of Cr(VI) from an aquifer. The influence of Cr(VI) initial concentration, adsorbent dosages, equilibrium studies, solution pH, kinetics, adsorption isotherms, and thermodynamic parameters was also investigated. Synopsis. The green synthesis of nZVI/graphene composites for Cr(VI) reduction has not been well investigation. This paper reports a facile eco-friendly synthesis of nZVI/graphene composites for the removal of heavy metal contaminants from aquifers. © 2022 Elsevier B.V.

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IITH Creators:

IITH Creators	ORCiD
Thatikonda, Shashidhar	https://orcid.org/0000-0003-2973-2224
Madras, Giridhar	https://orcid.org/0000-0003-2211-5055
Subrahmanyam, Challapalli	https://orcid.org/0000-0002-2643-3854

Item Type:

Article

Uncontrolled Keywords:

Adsorption; Catalyst; Fe3O4; Neem leaves; Zero valent iron

Subjects:

Chemistry
Civil Engineering
Chemical Engineering

Divisions:

Department of Chemical Engineering
Department of Chemistry
Department of Civil Engineering

Depositing User:

Ms Palak Jain

Date Deposited:

22 May 2023 09:49