title: Biosorption of cadmium by Brevundimonas sp. ZF12 strain, a novel biosorbent isolated from hot-spring waters in high background radiation areas.
abstract: The aim of this study is to screen cadmium biosorbing bacterial strains isolated from soils and hot-springs containing high concentrations of radium ((226)Ra) in Ramsar using a batch system. Brevundimonas sp. ZF12 strain isolated from the water with high (226)Ra content caused 50% removal of cadmium at a concentration level of 250 ppm. The biosorption equilibrium data are fitted well by the Langmuir adsorption isotherm and kinetic studies indicated that the biosorption follows pseudo second-order model. The effect of different physico-chemical parameters like biomass concentration, pH, cadmium concentration, temperature and contact time on cadmium sorption was also investigated using FTIR, SEM and XRD analytical techniques. A high desorption efficiency (above 90%) was obtained using a pH range of 2.0-4.0. Reusability of the biomass was examined under consecutive biosorption-desorption cycles repeated thrice. In conclusion, Brevundimonas sp. ZF12 is proposed as an excellent cadmium biosorbent that may have important applications in Cd removal from wastewaters.
authors: Department of Molecular Genetics, National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran.
authors: Nasrin
authors: N
authors: Masoudzadeh
authors: Fardideh
authors: F
authors: Zakeri
authors: Tayebe bagheri
authors: Tb
authors: Lotfabad
authors: Hakimeh
authors: H
authors: Sharafi
authors: Fatemeh
authors: F
authors: Masoomi
authors: Hoseein Shahbani
authors: HS
authors: Zahiri
authors: Gholamreza
authors: G
authors: Ahmadian
authors: Kambiz Akbari
authors: KA
authors: Noghabi
mesh_terms: D001417:Background Radiation; D002104:Cadmium / Q000378:metabolism*; D045482:Hot Springs / Q000382:microbiology*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D020560:Proteobacteria / Q000378:metabolism*; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: D002104:Cadmium