title: Biosorption of Hg(II) onto goethite with extracellular polymeric substances.
abstract: This study characterized the interactions of goethite, EPS from cyanobacterium Chroococcus sp. and Hg(II) using excitation emission matrix (EEM) spectra and adsorption isotherms. Three protein-like fluorescence peaks were noted to quench in the presence of Hg(II). The estimated conditional stability constant (logKa) and the binding constant (logKb) of the studied EPS-Hg(II) systems ranged 3.84-4.24 and 6.99-7.69, respectively. The proteins in EPS formed stable complex with Hg(II). The presence of proteins of Chroococcus sp. enhanced the adsorption capacity of Hg(II) on goethite; therefore, the goethite-EPS soil is a larger Hg(II) sink than goethite alone soil. Biosorption significantly affects the mobility of Hg(II) in goethite soils.
authors.affiliation: Laboratory of Environmental Pollution and Bioremediation, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China.
authors.forename: Wenjuan
authors.initials: W
authors.lastname: Song
authors.affiliation: Laboratory of Environmental Pollution and Bioremediation, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China. Electronic address: xlpan@ms.xjb.ac.cn.
authors.forename: Xiangliang
authors.initials: X
authors.lastname: Pan
authors.affiliation: Laboratory of Environmental Pollution and Bioremediation, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China.
authors.forename: Shuyong
authors.initials: S
authors.lastname: Mu
authors.affiliation: Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan.
authors.forename: Daoyong
authors.initials: D
authors.lastname: Zhang
authors.affiliation: Laboratory of Environmental Pollution and Bioremediation, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China.
authors.forename: Xue
authors.initials: X
authors.lastname: Yang
authors.affiliation: Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan. Electronic address: djlee@ntu.edu.tw.
authors.forename: Duu-Jong
authors.initials: DJ
authors.lastname: Lee
mesh_terms: D000327:Adsorption; D001673:Biodegradation, Environmental; D001704:Biopolymers / Q000737:chemistry*; D005110:Extracellular Space / Q000737:chemistry; D058085:Iron Compounds / Q000737:chemistry*; D007700:Kinetics; D008628:Mercury / Q000302:isolation & purification*; D008903:Minerals / Q000737:chemistry*; D013050:Spectrometry, Fluorescence
chemical_list: D001704:Biopolymers; D058085:Iron Compounds; D008903:Minerals; C094886:goethite; D008628:Mercury
keywords: Chroococcus sp.; Extracellular polymeric substances; Goethite; Mercury