Surface complexation model for multisite adsorption of copper(II) onto kaolinite

Peacock, Caroline L.; Sherman, David M.

doi:10.1016/j.gca.2004.12.029

Cited by 84 publications

(54 citation statements)

References 48 publications

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“…At pH < 5.0 the cationic form Cip + dominates, whereas at pH values between 5.0 and 9.0 the zwitterionic form Cip ( is the most important species and at pH > 10.0 the anionic form Cip -is the most abundant (SI Figure S1a). Consistent with Peacock and Sherman (22), Cu(II) was present as free cation between pH 2.0 and 6.6 (SI Figure S1b). Above pH 6.6, Cu precipitation as Cu(OH) 2 (s) as the major Cu(II) species would limit the concentration of aqueous Cu(II).…”

Section: Species Of Cip Cu(ii) and Cip-cu(ii) Complexes In Solutionsupporting

confidence: 86%

Coadsorption of Ciprofloxacin and Cu(II) on Montmorillonite and Kaolinite as Affected by Solution pH

Pei

Shan

Kong

et al. 2009

Environ. Sci. Technol.

145

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Section: Species Of Cip Cu(ii) and Cip-cu(ii) Complexes In Solutionsupporting

confidence: 86%

Coadsorption of Ciprofloxacin and Cu(II) on Montmorillonite and Kaolinite as Affected by Solution pH

Pei

Shan

Kong

et al. 2009

Environ. Sci. Technol.

145

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“…So, cations adsorption on siloxane basal surfaces is relatively weak compared with the cases of 2:1 type phyllosilicates (Vasconcelos et al, 2007). In contrast, metal cations can form strong chemical bonds with dangling sites on broken surfaces (Peacock and Sherman, 2005;Gu and Evans, 2008).…”

Section: Introductionmentioning

confidence: 98%

“…In contrast, there are much fewer studies on edge surfaces of kaolinite. For example, Peacock and Sherman (2005) investigated the complexing of Cu 2+ cations on broken surfaces. In the study of Kremleva et al (2011), they looked into uranyl complexing on the edge surfaces with static quantum mechanical methods.…”

Section: Introductionmentioning

confidence: 99%

Atomic scale structures of interfaces between kaolinite edges and water

Liu

Wang

et al. 2012

Geochimica et Cosmochimica Acta

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This paper reports the atomic scale structures of kaolinite edge surfaces in contact with water. The commonly occurring edge surfaces are investigated (i.e. (0 1 0) and (1 1 0)) by using first principles molecular dynamics (FPMD) technique. For (1 1 0)-type edge surface, there are two different surface topologies (denoted as (1 1 0)-1 and (1 1 0)-2) and they are considered separately.By using constrained FPMD technique, the free-energy changes for the leaving processes of water ligands of O-sheet Al cations have been calculated and thus, the coordination states of those Al cations are determined. The results show that for (0 1 0) and (1 1 0)-2 edges, both the 5 and 6-fold coordination states are possible whereas for (1 1 0)-1 edges, only the 6-fold states are stable. Based on the analyses of H-bonding structures at the interfaces, the surface acid/base reactive sites are illustrated. (1) T-sheet groups are "Si-OH, behaving as both proton donors and acceptors. (2) Bridging oxygen At (0 1 0) and (1 1 0)-2 edges, these sites are inaccessible from the water and thus, they are not effective reactive sites. At (1 1 0)-1 edges, the bridging oxygen atoms are proton accepting sites. (3) O-sheet groups At (0 1 0) and (1 1 0)-2 edges, for 6-fold Al cases, the active surface groups are "Al-(OH)(OH 2 ) and for the 5-fold Al cases, the active surface groups are "Al-(OH). At (1 1 0)-1 edges, the active site is "Al-OH 2 . This study provides fundamental structural properties for understanding the interface chemistry of widely occurring 1:1 type phyllosilicates.

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“…Using EXAFS, Peacock and Sherman (2004) showed that under acidic conditions Cu sorption to goethite occurs as inner-sphere complex binding of CuO 4 H n n-6 and binuclear Cu 2 O 6 H n n-8 . Sorption experiments of Cu binding to kaolinite at low pH suggest binding is a non-specific ion exchange on the permanently charged basal surface sites, whereas with increasing pH the variably charged edge sites become the major adsorption sites (Gu and Evans, 2008).…”

Section: Sorption Of Cu In Lateritementioning

confidence: 99%