401. Highly charged swelling mica-type clays for selective Cu exchange.
- Author
-
Ravella R, Komarneni S, and Martinez CE
- Subjects
- Clay, Fluorides chemistry, Ion Exchange, Kaolin chemistry, Magnesium Chloride chemistry, Magnesium Compounds chemistry, Silica Gel, Silicon Dioxide chemistry, Sodium Chloride chemistry, Waste Management methods, Aluminum Silicates chemistry, Copper chemistry, Soil Pollutants chemistry
- 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.
- Published
- 2008
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