title: Removal of cesium ions from clays by cationic surfactant intercalation.
abstract: We propose a new approach to remediate cesium-contaminated clays based on intercalation of the cationic surfactant dodecyltrimethylammonium bromide (DTAB) into clay interlayers. Intercalation of DTAB was found to occur very rapidly and involved exchanging interlayer cations. The reaction yielded efficient cesium desorption (∼97%), including of a large amount of otherwise non-desorbable cesium ions by cation exchange with ammonium ions. In addition, the intercalation of DTAB afforded an expansion of the interlayers, and an enhanced desorption of Cs by cation exchange with ammonium ions even at low concentrations of DTAB. Finally, the residual intercalated surfactants were easily removed by a decomposition reaction with hydrogen peroxide in the presence of Cu2+/Fe2+catalysts.
authors.affiliation: Decontamination & Decommissioning Research Division, Korea Atomic Energy Research Institute, Daedeok-daero 989-111, Yuseong-gu, Daejeon, Republic of Korea.
authors.forename: Chan Woo
authors.initials: CW
authors.lastname: Park
authors.affiliation: Decontamination & Decommissioning Research Division, Korea Atomic Energy Research Institute, Daedeok-daero 989-111, Yuseong-gu, Daejeon, Republic of Korea; Department of Chemical Engineering, Chungnam National University, Youseong-gu, Daejeon, Republic of Korea.
authors.forename: Bo Hyun
authors.initials: BH
authors.lastname: Kim
authors.affiliation: Decontamination & Decommissioning Research Division, Korea Atomic Energy Research Institute, Daedeok-daero 989-111, Yuseong-gu, Daejeon, Republic of Korea.
authors.forename: Hee-Man
authors.initials: HM
authors.lastname: Yang
authors.affiliation: Decontamination & Decommissioning Research Division, Korea Atomic Energy Research Institute, Daedeok-daero 989-111, Yuseong-gu, Daejeon, Republic of Korea.
authors.forename: Bum-Kyoung
authors.initials: BK
authors.lastname: Seo
authors.affiliation: Decontamination & Decommissioning Research Division, Korea Atomic Energy Research Institute, Daedeok-daero 989-111, Yuseong-gu, Daejeon, Republic of Korea.
authors.forename: Jei-Kwon
authors.initials: JK
authors.lastname: Moon
authors.affiliation: Decontamination & Decommissioning Research Division, Korea Atomic Energy Research Institute, Daedeok-daero 989-111, Yuseong-gu, Daejeon, Republic of Korea. Electronic address: nkwlee@kaeri.re.kr.
authors.forename: Kune-Woo
authors.initials: KW
authors.lastname: Lee
mesh_terms: D000327:Adsorption; D000538:Aluminum Silicates / Q000737:chemistry*; D002412:Cations; D002586:Cesium / Q000302:isolation & purification*; D000077215:Clay; D000644:Quaternary Ammonium Compounds; D013501:Surface-Active Agents
chemical_list: D000538:Aluminum Silicates; D002412:Cations; D000644:Quaternary Ammonium Compounds; D013501:Surface-Active Agents; D002586:Cesium; C022806:dodecyltrimethylammonium; D000077215:Clay
keywords: Cesium; Clays; Desorption; Soil remediation; Surfactant intercalation