Adsorption characteristics of some Cu(II) complexes on aluminosilicates

H. A. Elliott; C. P. Huang

doi:10.1016/0043-1354(81)90139-1

Adsorption characteristics of some Cu(II) complexes on aluminosilicates

H. A. Elliott, C. P. Huang

Agricultural & Biological Engineering

Research output: Contribution to journal › Article › peer-review

215 Scopus citations

Abstract

The adsorption of Cu(II) by aluminosilicates with varying Si/Al ratios was investigated. The presence of complex-forming organic ligands [nitrilotriacetate (NTA) and glycine (Gly)] alters metal electrovalency and, in so doing, modifies Cu(II) adsorption characteristics which can influence its fate, biological activity and transport in aquatic systems. Electrostatic attraction by a positively-charged aluminosilicate surface is an important mechanism whereby anion CuNTA^- complexes were adsorbed. Two distinct mechanisms are involved in the adsorption of cationic complexes: (1) an exchange reaction at permanent structural sites and (2) interfacial accumulation in response to the pH-dependent surface charge. The contribution of each mechanism to the total amount of CuGly⁺ adsorbed is related to the Si/A1 ratio. At the critical Si/A1 ratio (Si/A1_iso), the aluminosilicates have zero net pH-dependent surface charge. In the absence of specific adsorption, aluminosilicates for which Si/A1 ≥ Si/A1_iso can only function as cation exchangers. For Si/A1 < Si/A1_iso simultaneous adsorption of anions and cations is possible.

Original language	English (US)
Pages (from-to)	849-855
Number of pages	7
Journal	Water Research
Volume	15
Issue number	7
DOIs	https://doi.org/10.1016/0043-1354(81)90139-1
State	Published - 1981

All Science Journal Classification (ASJC) codes

Water Science and Technology
Ecological Modeling
Pollution
Waste Management and Disposal
Environmental Engineering
Civil and Structural Engineering

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10.1016/0043-1354(81)90139-1

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title = "Adsorption characteristics of some Cu(II) complexes on aluminosilicates",

abstract = "The adsorption of Cu(II) by aluminosilicates with varying Si/Al ratios was investigated. The presence of complex-forming organic ligands [nitrilotriacetate (NTA) and glycine (Gly)] alters metal electrovalency and, in so doing, modifies Cu(II) adsorption characteristics which can influence its fate, biological activity and transport in aquatic systems. Electrostatic attraction by a positively-charged aluminosilicate surface is an important mechanism whereby anion CuNTA- complexes were adsorbed. Two distinct mechanisms are involved in the adsorption of cationic complexes: (1) an exchange reaction at permanent structural sites and (2) interfacial accumulation in response to the pH-dependent surface charge. The contribution of each mechanism to the total amount of CuGly+ adsorbed is related to the Si/A1 ratio. At the critical Si/A1 ratio (Si/A1iso), the aluminosilicates have zero net pH-dependent surface charge. In the absence of specific adsorption, aluminosilicates for which Si/A1 ≥ Si/A1iso can only function as cation exchangers. For Si/A1 < Si/A1iso simultaneous adsorption of anions and cations is possible.",

author = "Elliott, {H. A.} and Huang, {C. P.}",

note = "Funding Information: Acknowledoements--This research work was supported by grant ENG-77-27379 from the Water Resources, Urban and Environmental Engineering Program of the National Science Foundation. The authors also wish to thank B. E. Jones and E. Rhoads for assistance in documenting the electrokinetic behavior and specific surface area of the aluminosilicates.",

year = "1981",

doi = "10.1016/0043-1354(81)90139-1",

language = "English (US)",

volume = "15",

pages = "849--855",

journal = "Water Research",

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T1 - Adsorption characteristics of some Cu(II) complexes on aluminosilicates

AU - Elliott, H. A.

AU - Huang, C. P.

N1 - Funding Information: Acknowledoements--This research work was supported by grant ENG-77-27379 from the Water Resources, Urban and Environmental Engineering Program of the National Science Foundation. The authors also wish to thank B. E. Jones and E. Rhoads for assistance in documenting the electrokinetic behavior and specific surface area of the aluminosilicates.

PY - 1981

Y1 - 1981

N2 - The adsorption of Cu(II) by aluminosilicates with varying Si/Al ratios was investigated. The presence of complex-forming organic ligands [nitrilotriacetate (NTA) and glycine (Gly)] alters metal electrovalency and, in so doing, modifies Cu(II) adsorption characteristics which can influence its fate, biological activity and transport in aquatic systems. Electrostatic attraction by a positively-charged aluminosilicate surface is an important mechanism whereby anion CuNTA- complexes were adsorbed. Two distinct mechanisms are involved in the adsorption of cationic complexes: (1) an exchange reaction at permanent structural sites and (2) interfacial accumulation in response to the pH-dependent surface charge. The contribution of each mechanism to the total amount of CuGly+ adsorbed is related to the Si/A1 ratio. At the critical Si/A1 ratio (Si/A1iso), the aluminosilicates have zero net pH-dependent surface charge. In the absence of specific adsorption, aluminosilicates for which Si/A1 ≥ Si/A1iso can only function as cation exchangers. For Si/A1 < Si/A1iso simultaneous adsorption of anions and cations is possible.

AB - The adsorption of Cu(II) by aluminosilicates with varying Si/Al ratios was investigated. The presence of complex-forming organic ligands [nitrilotriacetate (NTA) and glycine (Gly)] alters metal electrovalency and, in so doing, modifies Cu(II) adsorption characteristics which can influence its fate, biological activity and transport in aquatic systems. Electrostatic attraction by a positively-charged aluminosilicate surface is an important mechanism whereby anion CuNTA- complexes were adsorbed. Two distinct mechanisms are involved in the adsorption of cationic complexes: (1) an exchange reaction at permanent structural sites and (2) interfacial accumulation in response to the pH-dependent surface charge. The contribution of each mechanism to the total amount of CuGly+ adsorbed is related to the Si/A1 ratio. At the critical Si/A1 ratio (Si/A1iso), the aluminosilicates have zero net pH-dependent surface charge. In the absence of specific adsorption, aluminosilicates for which Si/A1 ≥ Si/A1iso can only function as cation exchangers. For Si/A1 < Si/A1iso simultaneous adsorption of anions and cations is possible.

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Adsorption characteristics of some Cu(II) complexes on aluminosilicates

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