Kinetic studies of Cd (II) and Pb (II) ions biosorption from aqueous media using untreated and chemically treated biosorbents
2014 (English)In: Water Science and Technology: Water Supply, ISSN 1606-9749, Vol. 69, no 11, 2230-2236 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2014. Vol. 69, no 11, 2230-2236 p.
biosorbents, cadmium, chemical treatment, chemisorption, kinetics, lead
Research subject Land and Water Resources Engineering
IdentifiersURN: urn:nbn:se:kth:diva-144998DOI: 10.2166/wst.2014.147ISI: 000338991400007ScopusID: 2-s2.0-84902338542OAI: oai:DiVA.org:kth-144998DiVA: diva2:715574
QC 201506232014-05-052014-05-052015-06-23Bibliographically approved