A novel CaO nanocomposite cross linked graphene oxide for Cr(VI) removal and sensing from wastewater

Singh, Simranjeet and Naik, TS Sunil Kumar and Anil, Amith G and Khasnabis, Sutripto and Nath, Bidisha and U, Basavaraju and Kumar, Vineet and Garg, VK and Subramanian, S and Singh, Joginder and Ramamurthy, Praveen C (2022) A novel CaO nanocomposite cross linked graphene oxide for Cr(VI) removal and sensing from wastewater. In: Chemosphere, 301 . ISSN 00456535

PDF che_301_2022.pdf - Published Version Restricted to Registered users only Download (12MB) | Request a copy

Abstract

A novel green nanocomposite has been prepared by immobilizing CaO nanoparticles (CaO NPs) on the surface of graphene oxide. Biogenic CaO-NPs were synthesized from Lala clamshells. Morphological and structural characterizations of the nanocomposite were studied extensively. The adsorption capacity (qmax) of the nanocomposite for removing Cr(VI) was 38.04 mg g−1. In addition to this, the adsorption data were adequately simulated with Langmuir, Freundlich, Temkin, and pseudo-second-order models, suggesting that the adsorption process was the combination of external mass transfer and chemisorption. Electrostatic interaction was the dominant mechanism for Cr(VI) removal. In addition, the synthesized nanocomposites also serve as an excellent sensor for Cr(VI) sensing, with a limit of detection (LOD) of 0.02 μM utilizing electrochemical methods. Therefore, this green nanocomposite can simultaneously serve as an adsorbent and sensor for Cr(VI)removal from aqueous solutions.

Item Type:	Journal Article
Publication:	Chemosphere
Publisher:	Elsevier Ltd
Additional Information:	The cpoyright of this article belongs to the Elsevier Ltd.
Keywords:	Adsorption; CaO NP's; Graphene oxide; Kinetics; Lala clamshell; Sensing
Department/Centre:	Division of Interdisciplinary Sciences > Interdisciplinary Centre for Energy Research Division of Interdisciplinary Sciences > Interdisciplinary Centre for Water Research Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	21 May 2022 06:18
Last Modified:	21 May 2022 06:18
URI:	https://eprints.iisc.ac.in/id/eprint/72319

Actions (login required)

View Item