Biosorption of zinc from aqueous solution using Azadirachta indica bark: Equilibrium and kinetic studies

• Published in: Journal of hazardous materials Vol. 152; no. 1; pp. 324 - 329
• Main Authors: King, P., Anuradha, K., Lahari, S. Beena, Prasanna Kumar, Y., Prasad, V.S.R.K.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 21-03-2008; Elsevier
• Subjects: Adsorption; Applied sciences; Azadirachta - metabolism; Azadirachta indica; Azadirachta indica bark; Biological and medical sciences; Biosorption; Biotechnology; Chemical engineering; Exact sciences and technology; Fundamental and applied biological sciences. Psychology; Hydrogen-Ion Concentration; Isotherms; Kinetic studies; Kinetics; Methods. Procedures. Technologies; Others; Particle Size; Plant Bark - metabolism; Pollution; Solutions; Various methods and equipments; Water; Zinc - metabolism; Azadirachta indica bark; Biosorption; Isotherms; Kinetic studies; Second order; Particle size; Bark; Metal ion; Biomass; Modeling; Uptake; Kinetic model; Adsorption; Batchwise; pH; Kinetics; Aqueous solution
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2007.06.101

The removal of zinc ions from aqueous solutions on the biomass of
Azadirachta indica bark has been studied by using batch adsorption technique. The biosorption studies were determined as a function of contact time, pH, initial metal ion concentration, average biosorbent size and biosorbent dosage. The equilibrium metal uptake was increased and percentage biosorption was decreased with an increase in the initial concentration and particle size of biosorbent. The maximum zinc biosorption occurred at pH 6 and percentage biosorption increases with increase in the biosorbent dosage. Experimental data obtained were tested with the adsorption models like Langmuir, Freundlich and Redlich–Peterson isotherms. Biosorption isothermal data were well interpreted by Langmuir model with maximum biosorption capacity of 33.49
mg/g of zinc ions on
A. indica bark biomass and kinetic data were properly fitted with the pseudo-second-order kinetic model.