Reversible photodeposition and dissolution of metal ions

Details Reversible photodeposition and dissolution of metal ions Reversible photodeposition and dissolution of metal ions

1993-09-20

1994-07-26

McCarthy, Neil

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210713, 210748, 210763, 210912, 210719, 210721, 20415744, C02F 132

Patent

active

053325087

ABSTRACT:
A cyclic photocatalytic process for treating waste water containing metal and organic contaminants. In one embodiment of the method, metal ions are photoreduced onto the photocatalyst and the metal concentrated by resolubilization in a smaller volume. In another embodiment of the method, contaminant organics are first oxidized, then metal ions removed by photoreductive deposition. The present invention allows the photocatalyst to be recycled until nearly complete removal of metal ions and organic contaminants is achieved.

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Michael R. Praire, et al., "An Investigation of TiO.sub.2 Photocatalysis for the Treatment of Water Contaminated with Metals and Organic Chemicals", Environ. Sci. Technol., vol. 27, No. 9, 1993, pp. 1776-1782.
J. W. M. Jacobs, et al., "Copper Photodeposition on TiO.sub.2 Studied with HREM and EXAFS", J. Electrochem. Soc., vol. 136, No. 10, Oct. 1989, pp. 2914-2923.

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