Surface complexation modeling of copper sorption by hydrous oxides of iron and aluminum

K. G. Karthikeyan, Herschel Adams Elliott

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

Surface complexation models were used to simulate adsorption (ADS) and coprecipitation (CPT) of copper (Cu) by hydrous oxides of iron (HFO) and aluminum (HAO) over a range of pH and surface-loading conditions. The generalized two-layer model was satisfactory for two very different conditions: (1) low sorbate/sorbent ratios where metal-oxide interaction is adequately described as Cu2+ coordination to surface functional groups and (2) under HFO-CPT conditions which result in extremely high adsorption site density (0.425 mol of sites/mol of Fe). As the sorbate/sorbent ratio is progressively increased, the models must account for metal hydrolysis and surface precipitate formation, and Cu interaction with both hydrous oxides could be fitted over a wide range of surface loadings using a comprehensive surface precipitation model. Similar mass law constants for sorption reactions were used for generalized two-layer and surface precipitation modeling, ADS and CPT conditions, and pH-edge and isotherm data. Corroborating sorption and spectroscopic evidence, modeling indicated that Cu precipitated on HAO, unlike HFO, has a markedly lower K(sp) than bulk precipitated Cu(OH)2(s). Results also suggest that enhanced Cu removal by CPT was not simply a manifestation of higher surface area.

Original languageEnglish (US)
Pages (from-to)88-95
Number of pages8
JournalJournal of Colloid And Interface Science
Volume220
Issue number1
DOIs
StatePublished - Dec 1 1999

Fingerprint

Aluminum Oxide
Complexation
Sorption
Copper
Iron
Aluminum
Oxides
Coprecipitation
Sorbents
Adsorption
Metals
ferric oxide
Functional groups
Isotherms
Precipitates
Hydrolysis

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

Cite this

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abstract = "Surface complexation models were used to simulate adsorption (ADS) and coprecipitation (CPT) of copper (Cu) by hydrous oxides of iron (HFO) and aluminum (HAO) over a range of pH and surface-loading conditions. The generalized two-layer model was satisfactory for two very different conditions: (1) low sorbate/sorbent ratios where metal-oxide interaction is adequately described as Cu2+ coordination to surface functional groups and (2) under HFO-CPT conditions which result in extremely high adsorption site density (0.425 mol of sites/mol of Fe). As the sorbate/sorbent ratio is progressively increased, the models must account for metal hydrolysis and surface precipitate formation, and Cu interaction with both hydrous oxides could be fitted over a wide range of surface loadings using a comprehensive surface precipitation model. Similar mass law constants for sorption reactions were used for generalized two-layer and surface precipitation modeling, ADS and CPT conditions, and pH-edge and isotherm data. Corroborating sorption and spectroscopic evidence, modeling indicated that Cu precipitated on HAO, unlike HFO, has a markedly lower K(sp) than bulk precipitated Cu(OH)2(s). Results also suggest that enhanced Cu removal by CPT was not simply a manifestation of higher surface area.",
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Surface complexation modeling of copper sorption by hydrous oxides of iron and aluminum. / Karthikeyan, K. G.; Elliott, Herschel Adams.

In: Journal of Colloid And Interface Science, Vol. 220, No. 1, 01.12.1999, p. 88-95.

Research output: Contribution to journalArticle

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