Modified crab shell particles for the removal of lead[II] ions from aqueous solutions
The ability of crab shell particles to remove lead[II] was evaluated in a batch reactor and in a fixed–bed column. The binding of lead[II] by crab shell was found to be affected significantly by pH, with maximum sorption capacity 714 mg/g observed at pH 4. The sorption isotherm of lead[II] on crab shell particles was modelled by the application of Langmuir followed by Sips, Redlich–Peterson and Freundlich. The kinetic data followed pseudo–second–order kinetics. A glass column (2 cm I.D and 35 cm height) was used to study the continuous lead[II] biosorption performance of crab shell particles with different bed heights.
Keywords: biosorption, crab shells, kinetics, packed bed column, lead removal, Portunus sanguinolentus, crab shell particles