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
| Autor: | Roopa Bose, Ahin Roy, Sajitha Nair, Shalini Tripathi, Smeer Durani |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Langmuir
Aqueous solution Materials science Materials Science (miscellaneous) Kinetics chemistry.chemical_element 02 engineering and technology Zinc 010501 environmental sciences Management Monitoring Policy and Law Uranium 021001 nanoscience & nanotechnology 01 natural sciences Pollution Silicate Amorphous solid chemistry.chemical_compound Adsorption chemistry Chemical engineering 0210 nano-technology Waste Management and Disposal 0105 earth and related environmental sciences Water Science and Technology |
| Zdroj: | Environmental Nanotechnology, Monitoring & Management. 10:127-139 |
| ISSN: | 2215-1532 |
| DOI: | 10.1016/j.enmm.2018.05.003 |
| Popis: | 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 SiO 2 nanotubes (SNTs) and crystalline Zn 2 SiO 4 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. |
| Databáze: | OpenAIRE |
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