Mechanistic Study of Lead Adsorption on Activated Carbon

Qiantao Shi, George E. Sterbinsky, Valentina Prigiobbe, Xiaoguang Meng

Research output: Contribution to journalArticle

Abstract

Activated carbon (AC) is a carbonaceous material broadly applied in filters to remove lead (Pb(II)) from drinking water through adsorption. However, the chemical interactions between Pb(II) and the reactive sites on AC or other carbonaceous materials are not well understood, yet. The understanding of the mechanism of Pb(II) adsorption onto AC would allow to optimally design AC-based materials even in the presence of a complex liquid phase. Here, the interaction between Pb(II) and functional groups on AC was investigated at the molecular scale to help identifying the chemical reactions at the solid-liquid interface. Spectroscopic analyses and chemical quantum calculations were performed and indicated the formation of monodentate mononuclear Pb(II)-phenol and bidentate mononuclear Pb(II)-carboxyl complexes on AC. Competitive adsorption behavior was observed between Pb(II) and calcium (Ca(II)) because of their similar adsorption configurations on AC. In contrast, anions, including sulfate and phosphate, were observed to enhance Pb(II) adsorption on AC by forming ternary complexes. On the basis of these observations, a new surface complexation model of Pb(II) adsorption onto AC was formulated and validated with batch tests. Overall, this work presents a new set of chemical reactions at the solid-liquid interface between Pb(II) and AC under various conditions of interest for the application of AC or other carbonaceous materials in water treatment.

LanguageEnglish (US)
Pages13565-13573
Number of pages9
JournalLangmuir
Volume34
Issue number45
DOIs
StatePublished - Nov 13 2018

Fingerprint

activated carbon
Activated carbon
Lead
Adsorption
adsorption
carbonaceous materials
liquid-solid interfaces
Chemical reactions
chemical reactions
Liquids
drinking
water treatment
Phenol
Complexation
Water treatment
Potable water
Drinking Water
phenols
Functional groups
Sulfates

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Materials Science(all)
  • Spectroscopy
  • Surfaces and Interfaces
  • Electrochemistry

Cite this

Shi, Qiantao ; Sterbinsky, George E. ; Prigiobbe, Valentina ; Meng, Xiaoguang. / Mechanistic Study of Lead Adsorption on Activated Carbon. In: Langmuir. 2018 ; Vol. 34, No. 45. pp. 13565-13573.
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Mechanistic Study of Lead Adsorption on Activated Carbon. / Shi, Qiantao; Sterbinsky, George E.; Prigiobbe, Valentina; Meng, Xiaoguang.

In: Langmuir, Vol. 34, No. 45, 13.11.2018, p. 13565-13573.

Research output: Contribution to journalArticle

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