Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2011-06-15

Journal: JOURNAL OF HAZARDOUS MATERIALS

Included Journals: PubMed、EI、SCIE

Volume: 190

Issue: 1-3

Page Number: 869-875

ISSN: 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.