Removal of U(VI) from aqueous solution by adsorption onto synthesized silica and zinc silicate nanotubes: Equilibrium and kinetic aspects with application to real samples

Tripathi, S and Roy, A and Nair, S and Durani, S and Bose, R (2018) Removal of U(VI) from aqueous solution by adsorption onto synthesized silica and zinc silicate nanotubes: Equilibrium and kinetic aspects with application to real samples. In: Environmental Nanotechnology, Monitoring and Management, 10 . pp. 127-139.

PDF env_nan_mon_man_10_127-139_2018.pdf - Published Version Restricted to Registered users only Download (3MB) | Request a copy

Abstract

Adsorption is an emerging technique in terms of both uranium removal and pre-concentration. This paper presents the feasibility of adsorption of uranium(VI) from aqueous solutions using hollow amorphous SiO2 nanotubes (SNTs) and crystalline Zn2SiO4 nanotubes (ZnSNTs), synthesised by scalable wet-chemical technique. With quantitative spectroscopy based techniques, we explore various parameters affecting the U(VI) adsorption. Detailed exploration of the kinetics shows that the process follows a Langmuir adsorption process, with a second order kinetics. Furthermore, adsorption isotherm yields a remarkably high uranium adsorption capacity (250 mg/g and 143 mg/g) of SNTs and ZnSNTs respectively, paving a way for their large scale application. The adsorbents remained selective wards the radionuclide even in aqueous matrices like sea water and mine affluent samples – thus highlighting the practical applicability of the method. On an extended note, we show that the adsorbents can be regenerated in a post-adsorption process, opening a tantalising possibility of recycling and reuse.

Item Type:	Journal Article
Publication:	Environmental Nanotechnology, Monitoring and Management
Publisher:	Elsevier B.V.
Additional Information:	The copyright for this article belongs to the Elsevier B.V.
Keywords:	Adsorption; Nanotube; Silica; Zinc silicate
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	05 Aug 2022 05:09
Last Modified:	05 Aug 2022 05:09
URI:	https://eprints.iisc.ac.in/id/eprint/75132

Actions (login required)

View Item