title: Biosorption behavior and mechanism of cesium-137 on Rhodosporidium fluviale strain UA2 isolated from cesium solution.
abstract: In order to identify a more efficient biosorbent for (137)Cs, we have investigated the biosorption behavior and mechanism of (137)Cs on Rhodosporidium fluviale (R. fluviale) strain UA2, one of the dominant species of a fungal group isolated from a stable cesium solution. We observed that the biosorption of (137)Cs on R. fluviale strain UA2 was a fast and pH-dependent process in the solution composed of R. fluviale strain UA2 (5 g/L) and cesium (1 mg/L). While a Langmuir isotherm equation indicated that the biosorption of (137)Cs was a monolayer adsorption, the biosorption behavior implied that R. fluviale strain UA2 adsorbed cesium ions by electrostatic attraction. The TEM analysis revealed that cesium ions were absorbed into the cytoplasm of R. fluviale strain UA2 across the cell membrane, not merely fixed on the cell surface, which implied that a mechanism of metal uptake contributed largely to the cesium biosorption process. Moreover, PIXE and EPBS analyses showed that ion-exchange was another biosorption mechanism for the cell biosorption of (137)Cs, in which the decreased potassium ions were replaced by cesium ions. All the above results implied that the biosorption of (137)Cs on R. fluviale strain UA2 involved a two-step process. The first step is passive biosorption that cesium ions are adsorbed to cells surface by electrostatic attraction; after that, the second step is active biosorption that cesium ions penetrate the cell membrane and accumulate in the cytoplasm.
authors.affiliation: Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, PR China.
authors.forename: Tu
authors.initials: T
authors.lastname: Lan
authors.affiliation: Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, PR China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Feng
authors.affiliation: Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, PR China. Electronic address: liaojiali@scu.edu.cn.
authors.forename: Jiali
authors.initials: J
authors.lastname: Liao
authors.affiliation: Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, PR China.
authors.forename: Xiaolong
authors.initials: X
authors.lastname: Li
authors.affiliation: Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, PR China.
authors.forename: Congcong
authors.initials: C
authors.lastname: Ding
authors.affiliation: Institute of Nuclear Physics and Chemistry, CAEP, Mianyang 621900, PR China.
authors.forename: Dong
authors.initials: D
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, PR China.
authors.forename: Jijun
authors.initials: J
authors.lastname: Yang
authors.affiliation: Institute of Nuclear Physics and Chemistry, CAEP, Mianyang 621900, PR China.
authors.forename: Junhui
authors.initials: J
authors.lastname: Zeng
authors.affiliation: Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, PR China.
authors.forename: Yuanyou
authors.initials: Y
authors.lastname: Yang
authors.affiliation: Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, PR China.
authors.forename: Jun
authors.initials: J
authors.lastname: Tang
authors.affiliation: Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, PR China. Electronic address: nliu720@scu.edu.cn.
authors.forename: Ning
authors.initials: N
authors.lastname: Liu
mesh_terms: D001487:Basidiomycota / Q000378:metabolism*; D002588:Cesium Radioisotopes / Q000378:metabolism*; D014874:Water Pollutants, Chemical / Q000378:metabolism
chemical_list: D002588:Cesium Radioisotopes; D014874:Water Pollutants, Chemical
keywords: Biosorption; Cesium; Mechanism; PIXE; Rhodosporidium; TEM