Application of graphene oxide for fluoride removal: kinetic and isotherm study
by Ram Ashok Konale; Nilesh Keshavrao Mahale; Sopan Tukaram Ingle
International Journal of Environment and Waste Management (IJEWM), Vol. 33, No. 1, 2024

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.

Online publication date: Tue, 09-Jan-2024

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