Title: Application of graphene oxide for fluoride removal: kinetic and isotherm study

Authors: Ram Ashok Konale; Nilesh Keshavrao Mahale; Sopan Tukaram Ingle

Addresses: School of Environmental and Earth Sciences, Kavayitri Bahinabai Chaudhari North Maharashtra University, Umavi Nagar, 425001, Jalgaon, India ' School of Environmental and Earth Sciences, Kavayitri Bahinabai Chaudhari North Maharashtra University, Umavi Nagar, 425001, Jalgaon, India ' School of Environmental and Earth Sciences, Kavayitri Bahinabai Chaudhari North Maharashtra University, Umavi Nagar, 425001, Jalgaon, India

Abstract: In the present study, graphene oxide (GO) is utilised as an adsorbent for defluoridation from synthetic sample as well as fluorite mine water. A modified Hummers method was adopted for the GO synthesis. The physico-chemical characterisation of the GO was done with FTIR, XRD, FESEM and EDX. The various parameter viz. adsorbent doses (100-250 mg/L), contact time (5-90 min.), pH (2-10), temperature (298-318 K) and initial concentration of fluoride (1-32 mg/L) were optimised for by GO. The maximum 98.34% fluoride adsorption was achieved by 100 mg/L GO dose in 30 min at pH 6. The adsorption process obeys the pseudo second order kinetics (R² = 0.995), Langmuir (18.86 mg/g) and defluoridation Freundlich isotherm (6.15 L/mg). The ionic interference was found negligible on fluoride removal from the fluorite mine water sample.

Keywords: fluoride adsorption; graphene oxide; kinetic equation; adsorption isotherm model.

DOI: 10.1504/IJEWM.2024.135880

International Journal of Environment and Waste Management, 2024 Vol.33 No.1, pp.102 - 131

Received: 23 Nov 2020
Accepted: 12 Jul 2021
Published online: 09 Jan 2024 *

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