Selective Cu2+ and Pb2+ exchange with highly charged cation exchanger of Na-4-mica

Tatsuya Kodama, Sridhar Komarneni

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Selective cation exchange for Cu and Pb has been demonstrated with the high-charge-density sodium fluorophlogopite mica, Na-4-mica. The 2Na+ → M2+ exchange reaction (M = Cu or Pb) was investigated with Na-4-micas prepared by two different synthetic processes. One was easily and economically prepared by crystallization from a mixture of NaF, MgO, and metakaolin, the latter serves as an inexpensive aluminosilicate source. Another was prepared by solution-sol-gel processing. Ion-exchange isotherms for Cu2+ and Pb2+ were obtained at room temperature. The thermodynamic functions for the initial ion-exchange reactions were calculated because the isotherms were not completed. High selectivities for both copper and lead exchange were found on the highly crystallized Na-4-mica prepared from metakaolin. Their ion-exchange capacities were 225 and 257 milliequivalents per 100 g of dry clay for Cu2+ and Pb2+, respectively. This high level decontamination of copper and lead with the highly crystallized Na-4-mica from metakaolin will be a very important separation required for purification of drinking water as well as for wastewater treatment and disposal.

Original languageEnglish (US)
Pages (from-to)2275-2292
Number of pages18
JournalSeparation Science and Technology
Volume34
Issue number12
DOIs
StatePublished - Dec 1 1999

Fingerprint

Ion exchangers
Mica
Cations
Ion exchange
Positive ions
Isotherms
Copper
Wastewater disposal
Decontamination
Aluminosilicates
Crystallization
Charge density
Potable water
Drinking Water
Wastewater treatment
Sol-gels
Purification
Clay
Lead
Sodium

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Filtration and Separation
  • Process Chemistry and Technology
  • Chemistry(all)

Cite this

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title = "Selective Cu2+ and Pb2+ exchange with highly charged cation exchanger of Na-4-mica",
abstract = "Selective cation exchange for Cu and Pb has been demonstrated with the high-charge-density sodium fluorophlogopite mica, Na-4-mica. The 2Na+ → M2+ exchange reaction (M = Cu or Pb) was investigated with Na-4-micas prepared by two different synthetic processes. One was easily and economically prepared by crystallization from a mixture of NaF, MgO, and metakaolin, the latter serves as an inexpensive aluminosilicate source. Another was prepared by solution-sol-gel processing. Ion-exchange isotherms for Cu2+ and Pb2+ were obtained at room temperature. The thermodynamic functions for the initial ion-exchange reactions were calculated because the isotherms were not completed. High selectivities for both copper and lead exchange were found on the highly crystallized Na-4-mica prepared from metakaolin. Their ion-exchange capacities were 225 and 257 milliequivalents per 100 g of dry clay for Cu2+ and Pb2+, respectively. This high level decontamination of copper and lead with the highly crystallized Na-4-mica from metakaolin will be a very important separation required for purification of drinking water as well as for wastewater treatment and disposal.",
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Selective Cu2+ and Pb2+ exchange with highly charged cation exchanger of Na-4-mica. / Kodama, Tatsuya; Komarneni, Sridhar.

In: Separation Science and Technology, Vol. 34, No. 12, 01.12.1999, p. 2275-2292.

Research output: Contribution to journalArticle

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AB - Selective cation exchange for Cu and Pb has been demonstrated with the high-charge-density sodium fluorophlogopite mica, Na-4-mica. The 2Na+ → M2+ exchange reaction (M = Cu or Pb) was investigated with Na-4-micas prepared by two different synthetic processes. One was easily and economically prepared by crystallization from a mixture of NaF, MgO, and metakaolin, the latter serves as an inexpensive aluminosilicate source. Another was prepared by solution-sol-gel processing. Ion-exchange isotherms for Cu2+ and Pb2+ were obtained at room temperature. The thermodynamic functions for the initial ion-exchange reactions were calculated because the isotherms were not completed. High selectivities for both copper and lead exchange were found on the highly crystallized Na-4-mica prepared from metakaolin. Their ion-exchange capacities were 225 and 257 milliequivalents per 100 g of dry clay for Cu2+ and Pb2+, respectively. This high level decontamination of copper and lead with the highly crystallized Na-4-mica from metakaolin will be a very important separation required for purification of drinking water as well as for wastewater treatment and disposal.

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