Highly charged swelling mica-type clays for selective Cu exchange

Ramesh Ravella, Sridhar Komarneni, Carmen Enid Martinez

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

There is a need to develop highly Cu2+ selective materials which can potentially remediate copper contaminated soils and water. Here we show that several highly charged synthetic swelling mica-type clays are highly selective for copper exchange. The synthetic micas have cation exchange capacities (CECs), which are close to their theoretical values. Both Na-saturated and Mg-saturated micas were investigated for Cu ion exchange selectivity. Ion exchange isotherms and Kielland plots were constructed using the equilibrated solution analyses. From these studies it was found that Na-4-mica and Na-3-mica could selectively exchange copper at lower concentrations from solution, whereas Na-2-mica sample performed better by showing Cu ion exchange selectively to almost its capacity. The EPR spectra of Cu-exchanged micas coincide with the mica's charge characteristics that predict increased binding strength of exchangeable Cu in Na-4-mica and Na-3-mica than in Na-2-mica.

Original languageEnglish (US)
Pages (from-to)113-118
Number of pages6
JournalEnvironmental Science and Technology
Volume42
Issue number1
DOIs
StatePublished - Jan 1 2008

Fingerprint

Mica
mica
swelling
Swelling
Clay
clay
Ion exchange
Copper
ion exchange
copper
electron spin resonance
cation exchange capacity
Paramagnetic resonance
Isotherms
Cations
isotherm
Positive ions
Soils
Water

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry

Cite this

Ravella, Ramesh ; Komarneni, Sridhar ; Martinez, Carmen Enid. / Highly charged swelling mica-type clays for selective Cu exchange. In: Environmental Science and Technology. 2008 ; Vol. 42, No. 1. pp. 113-118.
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Highly charged swelling mica-type clays for selective Cu exchange. / Ravella, Ramesh; Komarneni, Sridhar; Martinez, Carmen Enid.

In: Environmental Science and Technology, Vol. 42, No. 1, 01.01.2008, p. 113-118.

Research output: Contribution to journalArticle

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N2 - There is a need to develop highly Cu2+ selective materials which can potentially remediate copper contaminated soils and water. Here we show that several highly charged synthetic swelling mica-type clays are highly selective for copper exchange. The synthetic micas have cation exchange capacities (CECs), which are close to their theoretical values. Both Na-saturated and Mg-saturated micas were investigated for Cu ion exchange selectivity. Ion exchange isotherms and Kielland plots were constructed using the equilibrated solution analyses. From these studies it was found that Na-4-mica and Na-3-mica could selectively exchange copper at lower concentrations from solution, whereas Na-2-mica sample performed better by showing Cu ion exchange selectively to almost its capacity. The EPR spectra of Cu-exchanged micas coincide with the mica's charge characteristics that predict increased binding strength of exchangeable Cu in Na-4-mica and Na-3-mica than in Na-2-mica.

AB - There is a need to develop highly Cu2+ selective materials which can potentially remediate copper contaminated soils and water. Here we show that several highly charged synthetic swelling mica-type clays are highly selective for copper exchange. The synthetic micas have cation exchange capacities (CECs), which are close to their theoretical values. Both Na-saturated and Mg-saturated micas were investigated for Cu ion exchange selectivity. Ion exchange isotherms and Kielland plots were constructed using the equilibrated solution analyses. From these studies it was found that Na-4-mica and Na-3-mica could selectively exchange copper at lower concentrations from solution, whereas Na-2-mica sample performed better by showing Cu ion exchange selectively to almost its capacity. The EPR spectra of Cu-exchanged micas coincide with the mica's charge characteristics that predict increased binding strength of exchangeable Cu in Na-4-mica and Na-3-mica than in Na-2-mica.

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