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Equilibrium batch studies for biosorption of Cd(II) and Pb(II) ions from single-and binary-component aqueous media
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering. (Environmental geochemistry)
2Department of Civil and Environmental Engineering, Makerere University, Uganda.
Water and Sanitation Department, African Development Bank, Tunis, Tunisia.
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering. (Environmental Geochemistry)ORCID iD: 0000-0001-8491-4675
(English)Manuscript (preprint) (Other academic)
Keyword [en]
biosorbents, cadmium, lead, sorption isotherms, thermodynamics
National Category
Water Engineering
Research subject
Land and Water Resources Engineering
Identifiers
URN: urn:nbn:se:kth:diva-145002OAI: oai:DiVA.org:kth-145002DiVA: diva2:715587
Note

QS 2014

Available from: 2014-05-05 Created: 2014-05-05 Last updated: 2014-05-08Bibliographically approved
In thesis
1. Equilibrium and Kinetic Batch Studies of Cadmium and Lead sorption using Low Cost Biosorbents
Open this publication in new window or tab >>Equilibrium and Kinetic Batch Studies of Cadmium and Lead sorption using Low Cost Biosorbents
2014 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Agricultural wastes; Albizia coriaria, Coffea canephora, Cyperus papyrus, Erythrina abyssinica and Musa spp were evaluated for uptake of aqueous Cd2+ and Pb2+ ions in single- and binary-component solutions. Untreated, base-treated and peroxide-treated biomasses were employed in batch studies. The optimal conditions for Cd2+ and Pb2+ ions biosorption were  pH 3.5 – 5 for contact time 3.0 – 3.5 hours and biosorbent dosage 10 – 12.5 g/L. Base-treated biosorbents showed a 10 – 17 %  sorption enhancement for Cd2+ ions and a 1.6 – 2.3 % uptake reduction for Pb2+ ions. The sorption capacities for Cd2+ and Pb2+ ions for base-treated biosorbents were between 1.738 and 1.760 mg g-1 compared to 1.415 – 1.539 mg g-1 for untreated materials. The maximum biosorption of peroxide treated materials in single component media was between 0.819 and 1.595 mg/g for Pb2+ ions and between 0.044 and 1.343 mg/g for Cd2+ ions while in binary component media it was between 0.472 and 1.303 mg/g for Pb2+ ions and between 0.008 and 0.195 mg/g for Cd2+ ions. The pseudo-second order kinetic model suitably fitted the Cd2+ and Pb2+ ions biosorption data with regression coefficients (R2); 0.892 – 1.000 for peroxide-treated materials and 0.9784 – 0.9999 for base-treated biosorbents which implied that the biosorption was mainly a chemisorption process. The base treated biosorbents had better sorption performance for Cd2+ ions than peroxide treated materials and untreated biomass whereas the order for Pb2+ ions biosorption was untreated > base treated > peroxide treated materials. All materials showed superior selectivity for Pb2+ ions biosorption in comparison to that of Cd2+ ions in single- and binary-component media. A. coriaria performed best of the base treated biosorbents while C. canephora performed best amongst peroxide treated materials for Cd2+ and Pb2+ ions biosorption in single-and binary-component media. In the competitive biosorption, Cd2+ ions showed higher synergistic effects than Pb2+ ions although Pb2+ ions were preferentially sequestered even when the Cd2+:Pb2+ ions ratio was increased through 3:2, 2:1, 3:1 and 5:1. Of the three isotherm models evaluated against the experimental data, the Langmuir model generally fitted the sorption data for both metals. Regression coefficients for the Langmuir model were; 0.983 ≤ R2 ≥ 1.000 for single-component and 0.939 ≤ R2 ≥ 1.000 for binary-component solutions which revealed that the biosorption was potentially monolayer. The biosorption equilibrium coefficient                          values and change in Gibbs’ free energy  values showed that Pb2+ ions biosorption was more thermodynamically favoured than that of Cd2+ ions in single-component and binary-component media. The materials studied displayed potential for use as biosorbents for remediation of aqueous Cd2+ and Pb2+ ions.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. xvi, 32 p.
Series
TRITA-LWR. LIC, ISSN 1650-8629 ; 2014:04
Keyword
biosorbents, cadmium, chemisorption, isotherms, kinetics, lead
National Category
Water Engineering
Identifiers
urn:nbn:se:kth:diva-145004 (URN)
Presentation
2014-05-26, L1, Dr. Kristinas väg 30, KTH, Stockholm, 13:00 (English)
Opponent
Supervisors
Funder
Sida - Swedish International Development Cooperation Agency
Note

QC 20140508

Available from: 2014-05-08 Created: 2014-05-05 Last updated: 2014-05-08Bibliographically approved

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Norrström, Ann-Catrine

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