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Biosorption of lead(II) from aqueous solution on glutaraldehyde cross‐linked chitosan beads
Author(s) -
Suguna M.,
Siva Kumar N.,
Subba Reddy A.,
Boddu V. M.,
Krishnaiah A.
Publication year - 2011
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.20462
Subject(s) - biosorption , adsorption , glutaraldehyde , freundlich equation , aqueous solution , chemisorption , chemistry , langmuir adsorption model , langmuir , endothermic process , fourier transform infrared spectroscopy , monolayer , chitosan , nuclear chemistry , analytical chemistry (journal) , chromatography , chemical engineering , sorption , organic chemistry , biochemistry , engineering
The ability of glutaraldehyde cross‐linked chitosan beads (GCC beads) as synthetic adsorbent for adsorptive removal of Pb(II) ions from aqueous solutions is investigated in the present study. The biosorbent has been characterised by Brunner, Emmett, and Teller (BET) analysis, Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM) techniques. Equilibrium and column flow adsorption characteristics of Pb(II) ions on the biosorbent were studied. The effects of experimental variable parameters such as pH, concentration of metal ion, amount of adsorbent, contact time, temperature and interfering ions on adsorption have been investigated. The equilibrium data are fitted to pseudo‐first order, pseudo‐second order, fractionary order, chemisorption, Weber–Morris and Boyd models. Based on R 2 and error function values, it is observed that the kinetic data are better fitted to pseudo‐second‐order kinetic model and chemisorption model. The experimental data are analysed using Langmuir, Freundlich, and Sips adsorption isotherm models. The monolayer adsorption capacity of GCC beads as obtained from Langmuir isotherm at 35°C is found to be 204.0 mg/g. The thermodynamic constants of the adsorption process: ΔH 0 , ΔS 0 and ΔG 0 are evaluated. The results show that biosorption of Pb(II) ions on GCC beads are endothermic and spontaneous.