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Indexed by:期刊论文

Date of Publication:2011-06-15

Journal:JOURNAL OF HAZARDOUS MATERIALS

Included Journals:SCIE、EI、PubMed

Volume:190

Issue:1-3

Page Number:869-875

ISSN No.:0304-3894

Key Words:Leucobacter sp.; Ni (II) biosorption; Response surface methodology; Langmuir and Freundlich isotherms

Abstract:In the present study, batch experiments were carried out to characterize and optimize the removal process of Ni (II) by a nickel tolerant strain Leucobacter sp. N-4, which was isolated from the soil samples. The effects of operating parameters with respect to initial solution pH (3.0-6.5), initial nickel concentration (50-100 mg/L) and biomass dosage (1-10 g/L) on Ni (II) biosorption were investigated by response surface methodology (RSM). The maximal Ni (II) removal efficiency (nearly 99%) was achieved under the following conditions: pH 4.75, biomass dosage 5.38 g/L and initial Ni (II) concentration 53.6 mg/L The adsorption-equilibrium data fitted well with both Langmuir and Freundlich isotherms. The monolayer adsorption capacity of biomass obtained from Langmuir isotherm was about 19.6 mg/g. Infrared spectrometer (IR) results showed that chemical functional groups (e.g. -NH2, -OH and COO-M) of the biomass should be the active binding sites for Ni (II) biosorption from aqueous solutions. (C) 2011 Elsevier BY. All rights reserved.