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论文类型：期刊论文

发表时间：2011-06-15

发表刊物：JOURNAL OF HAZARDOUS MATERIALS

收录刊物：SCIE、EI、PubMed

卷号：190

期号：1-3

页面范围：869-875

ISSN号：0304-3894

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

摘要：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.