Adsorptive removal of cesium using bio fuel extraction microalgal waste.

Autor: Inoue K; Department of Applied Chemistry, Faculty of Science & Engineering, Saga University, Honjo 1, Saga 840-8502, Japan. Electronic address: inoue@elechem.chem.saga-u.ac.jp., Gurung M; Department of Applied Chemistry, Faculty of Science & Engineering, Saga University, Honjo 1, Saga 840-8502, Japan; Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, NL, Canada A1B 3X5., Adhikari BB; Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, NL, Canada A1B 3X5., Alam S; Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, NL, Canada A1B 3X5., Kawakita H; Department of Applied Chemistry, Faculty of Science & Engineering, Saga University, Honjo 1, Saga 840-8502, Japan., Ohto K; Department of Applied Chemistry, Faculty of Science & Engineering, Saga University, Honjo 1, Saga 840-8502, Japan., Kurata M; Research Laboratories, DENSO CORPORATION, Minamiyama 500-1, Komenoki, Nisshin, Aichi 470-0111, Japan., Atsumi K; New Business Promotion Dept., DENSO CORPORATION, Showa-cho 1-1, Kariya, Aichi 448-8661, Japan.
Jazyk: angličtina
Zdroj: Journal of hazardous materials [J Hazard Mater] 2014 Apr 30; Vol. 271, pp. 196-201. Date of Electronic Publication: 2014 Feb 12.
DOI: 10.1016/j.jhazmat.2014.02.003
Abstrakt: An adsorption gel was prepared from microalgal waste after extracting biodiesel oil by a simple chemical treatment of crosslinking using concentrated sulfuric acid. The adsorbent exhibited notably high selectivity and adsorption capacity towards Cs(+) over Na(+) from aqueous solutions, within the pH range of slightly acidic to neutral. The adsorption followed Langmuir isotherm and the maximum adsorption capacity of the gel for Cs(+) calculated from Langmuir model was found to be 1.36 mol kg(-1). Trace concentration of Cs(+) ions present in aqueous streams was successfully separated from Na(+) ions using a column packed with the adsorbent at pH 6.5. The adsorption capacity of the gel towards Cs(+) in column operation was 0.13 mol kg(-1). Although the adsorbed Cs(+) ions were easily eluted using 1M hydrochloric acid solution, simple incineration is proposed as an alternative for the treatment of adsorbent loaded with radioactive Cs(+) ions due to the combustible characteristics of this adsorbent.
(Copyright © 2014 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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