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Equilibrium and Kinetic Batch Studies of Cadmium and Lead sorption using Low Cost Biosorbents
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Hållbar utveckling, miljövetenskap och teknik. (Environmental Geochemistry)
2014 (engelsk)Licentiatavhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Stockholm: KTH Royal Institute of Technology, 2014. , s. xvi, 32
Serie
TRITA-LWR. LIC, ISSN 1650-8629 ; 2014:04
Emneord [en]
biosorbents, cadmium, chemisorption, isotherms, kinetics, lead
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-145004OAI: oai:DiVA.org:kth-145004DiVA, id: diva2:715605
Presentation
2014-05-26, L1, Dr. Kristinas väg 30, KTH, Stockholm, 13:00 (engelsk)
Opponent
Veileder
Forskningsfinansiär
Sida - Swedish International Development Cooperation Agency
Merknad

QC 20140508

Tilgjengelig fra: 2014-05-08 Laget: 2014-05-05 Sist oppdatert: 2014-05-08bibliografisk kontrollert
Delarbeid
1. Kinetic studies of Cd (II) and Pb (II) ions biosorption from aqueous media using untreated and chemically treated biosorbents
Åpne denne publikasjonen i ny fane eller vindu >>Kinetic studies of Cd (II) and Pb (II) ions biosorption from aqueous media using untreated and chemically treated biosorbents
2014 (engelsk)Inngår i: Water Science and Technology: Water Supply, ISSN 1606-9749, E-ISSN 1607-0798, Vol. 69, nr 11, s. 2230-2236Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Untreated and chemically treated Albizia coriaria, Erythrina abyssinica and Musa spp were studied in batch for uptake of Cd2+ and Pb2+ ions at pH 2.0–9.0 and agitation time; 30–390 min. Optimum biosorption conditions were; pH 4 for Pb2+ ions and pH 5 for Cd2+ ions, contact time was 3.5 hours at 24 ± 1 °C for 10 mg/L biosorbent dosage and initial metal ions concentration of 20 mg/L. Chemical treatment had a 10–17% biosorption efficiency enhancement for Cd2+ ions and a 1.6–2.3% reduction effect for Pb2+ ions. The sorption capacities for Cd2+ and Pb2+ ions for treated biosorbents were between 1.760–1.738 mg g−1 compared to 1.415–1.539 mg g−1 for untreated materials. The pseudo second order model suitably fitted the Cd2+ and Pb2+ ions biosorption data with regression coefficients (R2) between 0.9784–0.9999. Fitting of the Ho model to the experimental data showed that the biosorption mechanism for both metal ions studied was mainly a chemisorption process. Therefore, treated A. coriaria, E. abyssinica and Musa spp were potential biosorbents for remediation of Cd2+ ions and the untreated materials suitable for removing Pb2+ ions from contaminated aqueous media.

Emneord
biosorbents, cadmium, chemical treatment, chemisorption, kinetics, lead
HSV kategori
Forskningsprogram
Mark- och vattenteknik
Identifikatorer
urn:nbn:se:kth:diva-144998 (URN)10.2166/wst.2014.147 (DOI)000338991400007 ()24901616 (PubMedID)2-s2.0-84902338542 (Scopus ID)
Merknad

QC 20150623

Tilgjengelig fra: 2014-05-05 Laget: 2014-05-05 Sist oppdatert: 2020-03-09bibliografisk kontrollert
2. Single and binary biosorption kinetics for Cd and Pb from aqueous media using Coffea canephora, Cyperus papyrus and Musa spp
Åpne denne publikasjonen i ny fane eller vindu >>Single and binary biosorption kinetics for Cd and Pb from aqueous media using Coffea canephora, Cyperus papyrus and Musa spp
(engelsk)Manuskript (preprint) (Annet vitenskapelig)
Emneord
Chemisorption, Coffea canephora, Cyperus papyrus, Musa spp
HSV kategori
Forskningsprogram
Mark- och vattenteknik
Identifikatorer
urn:nbn:se:kth:diva-145001 (URN)
Merknad

QS 2014

Tilgjengelig fra: 2014-05-05 Laget: 2014-05-05 Sist oppdatert: 2014-05-08bibliografisk kontrollert
3. Equilibrium batch studies for biosorption of Cd(II) and Pb(II) ions from single-and binary-component aqueous media
Åpne denne publikasjonen i ny fane eller vindu >>Equilibrium batch studies for biosorption of Cd(II) and Pb(II) ions from single-and binary-component aqueous media
(engelsk)Manuskript (preprint) (Annet vitenskapelig)
Emneord
biosorbents, cadmium, lead, sorption isotherms, thermodynamics
HSV kategori
Forskningsprogram
Mark- och vattenteknik
Identifikatorer
urn:nbn:se:kth:diva-145002 (URN)
Merknad

QS 2014

Tilgjengelig fra: 2014-05-05 Laget: 2014-05-05 Sist oppdatert: 2014-05-08bibliografisk kontrollert

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