title: Adsorptive removal of cesium using bio fuel extraction microalgal waste.
abstract: 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.
authors.affiliation: 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.
authors.forename: Katsutoshi
authors.initials: K
authors.lastname: Inoue
authors.affiliation: 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.
authors.forename: Manju
authors.initials: M
authors.lastname: Gurung
authors.affiliation: Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, NL, Canada A1B 3X5.
authors.forename: Birendra Babu
authors.initials: BB
authors.lastname: Adhikari
authors.affiliation: Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, NL, Canada A1B 3X5.
authors.forename: Shafiq
authors.initials: S
authors.lastname: Alam
authors.affiliation: Department of Applied Chemistry, Faculty of Science & Engineering, Saga University, Honjo 1, Saga 840-8502, Japan.
authors.forename: Hidetaka
authors.initials: H
authors.lastname: Kawakita
authors.affiliation: Department of Applied Chemistry, Faculty of Science & Engineering, Saga University, Honjo 1, Saga 840-8502, Japan.
authors.forename: Keisuke
authors.initials: K
authors.lastname: Ohto
authors.affiliation: Research Laboratories, DENSO CORPORATION, Minamiyama 500-1, Komenoki, Nisshin, Aichi 470-0111, Japan.
authors.forename: Minoru
authors.initials: M
authors.lastname: Kurata
authors.affiliation: New Business Promotion Dept., DENSO CORPORATION, Showa-cho 1-1, Kariya, Aichi 448-8661, Japan.
authors.forename: Kinya
authors.initials: K
authors.lastname: Atsumi
mesh_terms: D000327:Adsorption; D056804:Biofuels; D002586:Cesium / Q000737:chemistry*; D000460:Chlorophyta / Q000737:chemistry*; D005782:Gels; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D058086:Microalgae / Q000737:chemistry*; D012964:Sodium / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D056804:Biofuels; D005782:Gels; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D002586:Cesium; D012964:Sodium
keywords: Adsorption; Biofuel; Cesium; Microalgal waste; Removal