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Kinetic and mechanism studies of the adsorption of lead onto waste cow bone powder (WCBP) surfaces

This study examines the adsorption isotherms, kinetics and mechanisms of Pb2+ sorption onto waste cow bone powder (WCBP) surfaces. The concentrations of Pb2+ in the study range from 10 to 90 mg/L. Although the sorption data follow the Langmuir and Freundlich isotherm, a detailed examination reveals...

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Main Authors: Cha, J., Cui, M., Jang, M., Cho, S.H., Moon, D.H., Khim, J.
Format: Article
Language:English
Published: 2011
Subjects:
TA Engineering (General). Civil engineering (General)
Online Access:http://eprints.um.edu.my/9183/1/Kinetic_and_mechanism_studies_of_the_adsorption_of_lead.pdf
http://eprints.um.edu.my/9183/
http://www.scopus.com/inward/record.url?eid=2-s2.0-78650310013&partnerID=40&md5=cd4b6f3f606b9fdb062e272354118c5b http://link.springer.com/article/10.1007/s10653-010-9357-z http://www.ncbi.nlm.nih.gov/pubmed/21046431
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spelling my.um.eprints.91832014-01-29T03:05:13Z http://eprints.um.edu.my/9183/ Kinetic and mechanism studies of the adsorption of lead onto waste cow bone powder (WCBP) surfaces Cha, J. Cui, M. Jang, M. Cho, S.H. Moon, D.H. Khim, J. TA Engineering (General). Civil engineering (General) This study examines the adsorption isotherms, kinetics and mechanisms of Pb2+ sorption onto waste cow bone powder (WCBP) surfaces. The concentrations of Pb2+ in the study range from 10 to 90 mg/L. Although the sorption data follow the Langmuir and Freundlich isotherm, a detailed examination reveals that surface sorption or complexation and co-precipitation are the most important mechanisms, along with possibly ion exchange and solid diffusion also contributing to the overall sorption process. The co-precipitation of Pb2+ with the calcium hydroxyapatite (Ca-HAP) is implied by significant changes in Ca2+ and PO4 3- concentrations during the metal sorption processes. The Pb2+ sorption onto the WCBP surface by metal complexation with surface functional groups such as ≡ POH. The major metal surface species are likely to be ≡ POPb+. The sorption isotherm results indicated that Pb2+ sorption onto the Langmuir and Freundlich constant qmax and KF is 9.52 and 8.18 mg g-1, respectively. Sorption kinetics results indicated that Pb2+ sorption onto WCBP was pseudo-second-order rate constants K2 was 1.12 g mg-1 h-1. The main mechanism is adsorption or surface complexation (≡POPb+: 61.6%), co-precipitation or ion exchange [Ca3.93 Pb1.07 (PO4)3 (OH): 21.4%] and other precipitation [Pb 50 mg L-1 and natural pH: 17%). Sorption isotherms showed that WCBP has a much higher Pb2+ removal rate in an aqueous solution; the greater capability of WCBP to remove aqueous Pb2+ indicates its potential as another promising way to remediate Pb2+-contaminated media. © 2010 Springer Science+Business Media B.V. 2011 Article PeerReviewed application/pdf en http://eprints.um.edu.my/9183/1/Kinetic_and_mechanism_studies_of_the_adsorption_of_lead.pdf Cha, J. and Cui, M. and Jang, M. and Cho, S.H. and Moon, D.H. and Khim, J. (2011) Kinetic and mechanism studies of the adsorption of lead onto waste cow bone powder (WCBP) surfaces. Environmental Geochemistry and Health, 33 (SUPPL.). pp. 81-89. ISSN 0269-4042 http://www.scopus.com/inward/record.url?eid=2-s2.0-78650310013&partnerID=40&md5=cd4b6f3f606b9fdb062e272354118c5b http://link.springer.com/article/10.1007/s10653-010-9357-z http://www.ncbi.nlm.nih.gov/pubmed/21046431 10.1007/s10653-010-9357-z
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
language English
topic TA Engineering (General). Civil engineering (General)
spellingShingle TA Engineering (General). Civil engineering (General)
Cha, J.
Cui, M.
Jang, M.
Cho, S.H.
Moon, D.H.
Khim, J.
Kinetic and mechanism studies of the adsorption of lead onto waste cow bone powder (WCBP) surfaces
description This study examines the adsorption isotherms, kinetics and mechanisms of Pb2+ sorption onto waste cow bone powder (WCBP) surfaces. The concentrations of Pb2+ in the study range from 10 to 90 mg/L. Although the sorption data follow the Langmuir and Freundlich isotherm, a detailed examination reveals that surface sorption or complexation and co-precipitation are the most important mechanisms, along with possibly ion exchange and solid diffusion also contributing to the overall sorption process. The co-precipitation of Pb2+ with the calcium hydroxyapatite (Ca-HAP) is implied by significant changes in Ca2+ and PO4 3- concentrations during the metal sorption processes. The Pb2+ sorption onto the WCBP surface by metal complexation with surface functional groups such as ≡ POH. The major metal surface species are likely to be ≡ POPb+. The sorption isotherm results indicated that Pb2+ sorption onto the Langmuir and Freundlich constant qmax and KF is 9.52 and 8.18 mg g-1, respectively. Sorption kinetics results indicated that Pb2+ sorption onto WCBP was pseudo-second-order rate constants K2 was 1.12 g mg-1 h-1. The main mechanism is adsorption or surface complexation (≡POPb+: 61.6%), co-precipitation or ion exchange [Ca3.93 Pb1.07 (PO4)3 (OH): 21.4%] and other precipitation [Pb 50 mg L-1 and natural pH: 17%). Sorption isotherms showed that WCBP has a much higher Pb2+ removal rate in an aqueous solution; the greater capability of WCBP to remove aqueous Pb2+ indicates its potential as another promising way to remediate Pb2+-contaminated media. © 2010 Springer Science+Business Media B.V.
format Article
author Cha, J.
Cui, M.
Jang, M.
Cho, S.H.
Moon, D.H.
Khim, J.
author_facet Cha, J.
Cui, M.
Jang, M.
Cho, S.H.
Moon, D.H.
Khim, J.
author_sort Cha, J.
title Kinetic and mechanism studies of the adsorption of lead onto waste cow bone powder (WCBP) surfaces
title_short Kinetic and mechanism studies of the adsorption of lead onto waste cow bone powder (WCBP) surfaces
title_full Kinetic and mechanism studies of the adsorption of lead onto waste cow bone powder (WCBP) surfaces
title_fullStr Kinetic and mechanism studies of the adsorption of lead onto waste cow bone powder (WCBP) surfaces
title_full_unstemmed Kinetic and mechanism studies of the adsorption of lead onto waste cow bone powder (WCBP) surfaces
title_sort kinetic and mechanism studies of the adsorption of lead onto waste cow bone powder (wcbp) surfaces
publishDate 2011
url http://eprints.um.edu.my/9183/1/Kinetic_and_mechanism_studies_of_the_adsorption_of_lead.pdf
http://eprints.um.edu.my/9183/
http://www.scopus.com/inward/record.url?eid=2-s2.0-78650310013&partnerID=40&md5=cd4b6f3f606b9fdb062e272354118c5b http://link.springer.com/article/10.1007/s10653-010-9357-z http://www.ncbi.nlm.nih.gov/pubmed/21046431
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score 13.211869

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