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The blending effect of natural polysaccharides with nano-zirconia towards the removal of fluoride and arsenate from water

Fernando, M Shanika; Wimalasiri, AKDVK; Dziemidowicz, Karolina; Williams, Gareth R; Koswattage, K Rasika; Dissanayake, DP; De Silva, KM Nalin; (2023) The blending effect of natural polysaccharides with nano-zirconia towards the removal of fluoride and arsenate from water. Royal Society Open Science , 10 (3) , Article 221514. 10.1098/rsos.221514. Green open access

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Abstract

Nano-zirconia (ZO) was synthesized using a microwave-assisted one-pot precipitation route. Two biopolymers, chitosan (CTS) and carboxymethyl cellulose were blended with ZO at different w/w ratios. The formulation with 30% w/w chitosan (ZO-CTS) was found to give enhanced uptake of F− and As(V). ZO and the most effective ZO-CTS system were characterized using Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. These confirmed the formation of a composite system containing nanoparticles of 50 nm in size, in which ZO was present in the amorphous form. It was observed that the combination of ZO with CTS improved the F− and As(V) adsorption capacity most notably at pH 5.5. Fluoride adsorption by ZO-CTS followed the Freundlich isotherm model, with an adsorption capacity of 120 mg g−1. Adsorption of As(V) by ZO-CTS could be fitted with both the Langmuir and Freundlich isotherm models and was found to have a capacity of 14.8 mg g−1. Gravity filtration studies conducted for groundwater levels indicated the effectiveness of ZO-CTS in adsorbing As(V) and F− at a pH of 5.5. The ability of the ZO-CTS in removing Cd(II) and Pb(II) was also investigated, and no such enhancement was observed, and found the neat ZO was the most potent sorbent here.

Type: Article
Title: The blending effect of natural polysaccharides with nano-zirconia towards the removal of fluoride and arsenate from water
Open access status: An open access version is available from UCL Discovery
DOI: 10.1098/rsos.221514
Publisher version: https://doi.org/10.1098/rsos.221514
Language: English
Additional information: © 2023 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, provided the original author and source are credited.
Keywords: zirconia, chitosan, adsorption, fluoride, arsenate
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > UCL School of Pharmacy
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > UCL School of Pharmacy > Pharmaceutics
URI: https://discovery.ucl.ac.uk/id/eprint/10166342
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