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

Content Provider	Springer Nature Link
Author	Cha, Jihoon Cui, Mingcan Jang, Min Cho, Sang Hyun Moon, Deok Hyun Khim, Jeehyeong
Copyright Year	2010
Abstract	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 q max and K F 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 K 2 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.
Starting Page	81
Ending Page	89
Page Count	9
File Format	PDF
ISSN	02694042
Journal	Environmental Geochemistry and Health
Volume Number	33
Issue Number	1
e-ISSN	15732983
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-11-03
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Adsorption isotherm Waste cow bone powder Kinetics Mechanism Lead Public Health/Gesundheitswesen Environmental Chemistry Soil Science & Conservation Terrestrial Pollution Geochemistry Environmental Health
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Medicine Geochemistry and Petrology Environmental Engineering Water Science and Technology

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