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Biosorption of copper by Sphaerotilus natans immobilised in polysulfone matrix: equilibrium and kinetic analysis
- Source :
- Hydrometallurgy. 70:101-112
- Publication Year :
- 2003
- Publisher :
- Elsevier BV, 2003.
-
Abstract
- Copper biosorption by Sphaerotilus natans immobilised in polysulfone matrices has been studied. Firstly, a rough characterisation of biosorbent beads has been performed, and operating conditions for beads preparation aimed at biosorption have been optimised. Then, the equilibrium of the process was studied in order to determine the effect of pH and biomass concentration inside beads; experimental data were successfully fitted by the Langmuir equation, and the highest value for loading was 5.4 mg/g estimated at pH 5.5 and 0.18 g of lyophilised biomass per gram of beads. Biosorption kinetics has also been studied, and an original kinetic model was developed which is able to correlate experimental data. This model was developed from the Shrinking Core Model, considering a variable copper diffusion coefficient dependent on the process conversion. The estimated values for copper diffusion coefficient were obviously lower than copper diffusivity in water, and they depend on biomass concentration inside beads. Beads regeneration was studied using EDTA, HCl and CaCl 2 . Satisfactory biosorption performances were observed also after 10 sorption/desorption cycles, with CaCl 2 as regeneration solution. All the results confirmed the technical feasibility of the biosorption process by a polysulfone-entrapped biomass even though biosorption efficiency should be improved.
- Subjects :
- Chromatography
Hydrometallurgy
biology
Sphaerotilus natans
Diffusion
Metals and Alloys
Biosorption
chemistry.chemical_element
Sorption
polysulfone
biology.organism_classification
Copper
Industrial and Manufacturing Engineering
chemistry.chemical_compound
Chemical engineering
chemistry
copper
Desorption
kinetic modelling
Materials Chemistry
immobilised biomass
Polysulfone
biosorption
sphaerotilus
Subjects
Details
- ISSN :
- 0304386X
- Volume :
- 70
- Database :
- OpenAIRE
- Journal :
- Hydrometallurgy
- Accession number :
- edsair.doi.dedup.....f45cf9e3ddf48300319e38f8e59ea526