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

Jihoon Cha, Mingcan Cui, Min Jang, Sang Hyun Cho, Deok Hyun Moon, Jeehyeong Khim

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

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 PO43- 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.

Original languageEnglish
Pages (from-to)81-89
Number of pages9
JournalEnvironmental geochemistry and health
Volume33
Issue numberSUPPL. 1
DOIs
Publication statusPublished - 2011

Keywords

  • Adsorption isotherm
  • Kinetics
  • Lead
  • Mechanism
  • Waste cow bone powder

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Water Science and Technology
  • Environmental Science(all)
  • Geochemistry and Petrology

Fingerprint Dive into the research topics of 'Kinetic and mechanism studies of the adsorption of lead onto waste cow bone powder (WCBP) surfaces'. Together they form a unique fingerprint.

Cite this