期刊
COLLOIDS AND SURFACES B-BIOINTERFACES
卷 72, 期 2, 页码 295-302出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfb.2009.04.018
关键词
Wangia profunda SM-A87; Exopolysaccharides; Biosorption; Copper(II); Cadmium(II)
资金
- Hi-Tech Research and Development Program of China [2006AA06Z326, 2007AA091903]
- National Natural Science Foundation of China [50878120]
- Natural Science Foundation of Shandong province of China Z2008B09 [Z2008B09]
- Foundation for Young Excellent Scientists in Shandong Province [(007BS08004]
The biosorption behaviors and mechanisms of a novel exopolysaccharide (EPS), which is secreted by a mesophilic bacterium (namely Wangia profunda (SM-A87)) isolated from deep-sea sediment, for heavy metals Cu(II) and Cd(II) have been studied in this paper. The effects of SM-A87 EPS concentration, solution pH and ionic strength on the metal uptake were investigated by employing batch adsorption techniques, respectively. The optimum biosorption capacities were observed at pH 5.0 for Cu(II) with 48.0 mg/g and pH 6.0 for Cd(II) with 39.75 mg/g, respectively. Addition of salts decreased Cu(II) or Cd(II) uptake in the order of K(+) < Na(+) < Ca(2+) Langmuir and Freundlich models were employed to describe the biosorption equilibrium data, indicating the favorable biosorption occurs and larger biosorption capacity and intensity for Cu(II) than for Cd(II). The biosorption kinetics for both metals can be well described by pseudo-second-order kinetic model, compared with pseudo-first-order and intraparticle diffusion kinetic models. The competitive biosorption was also studied, indicating that in two-component solution with different metal ratios, the selective biosorption of SM-A87 EPS for Cu(II) was much higher than for Cd(II). The Fourier transform infrared spectroscopy (FT-IR) analysis indicated possible functional groups (e.g., -OH, -COO and C-O-C) of SM-A87 EPS involved in metal biosorption process, which indicated the potential of using SM-A87 EPS as an effective sorbent for Cu(II) or Cd(II) removal from water. (C) 2009 Elsevier B.V. All rights reserved.
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