Method for adsorption and reduction of hexavalent chromium...

Details Method for adsorption and reduction of hexavalent chromium... Method for adsorption and reduction of hexavalent chromium...

2007-09-25

2007-09-25

Savage, Matthew O. (Department: 1724)

Liquid purification or separation

Processes

Ion exchange or selective sorption

C210S757000, C210S913000

Reexamination Certificate

active

11036587

ABSTRACT:
The present invention relates to the development of an improved methodology for adsorption and subsequent reduction of hexavalent chromium aimed at the total removal of hexavalent chromium in water, which comprises, reacting dichromate solutions with natural ferrous-saponite clays at temperature 50 to 200° C. for the period of 1 to 3.0 hours.

REFERENCES:
G. Parthasarathy, et al., “Ferrous saponite from the Deccan Trap, India, and its application in adsorption and reduction of hexavalent chromium,” American Mineralogist, vol. 88, pp. 1983-1988 (2003).
G. Parthasarathy, et al., “Reduction of hexavalent chromium by natural iron-rich saponite,” Goldschmidt Conference Abstracts, p. A376 (2003).
Blowes, Science, v 295, pp. 2024 (2002).
Taylor et al., Clays and Clay Minerals, v 48, pp. 648 (2000).
Drljaca et al., Inorg. Chemistry, v 31, pp. 4894 (1992).
Kim et al., environmental Geology, v 42, pp. 642 (2002).

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