Removal of heavy metals, especially lead, from aqueous systems c

Details Removal of heavy metals, especially lead, from aqueous systems c Removal of heavy metals, especially lead, from aqueous systems c

1990-12-04

1991-10-01

Silverman, Stanley S.

Liquid purification or separation

Processes

Ion exchange or selective sorption

210912, 210913, 210914, C02F 128

Patent

active

050531395

ABSTRACT:
A process for the removal of heavy metals such as lead, cadmium, zinc, chromium, arsenic and mercury from aqueous solutions containing one or more of said metals as well as competing ions such as calcium and/or magnesium by contacting said aqueous solution with amorphous titanium or tin silicates is disclosed. Said amorphous titanium and tin silicates are characterized by a silicon-to-titanium or tin molar ratio of from 1:4 to 1.9:1 and a cumulative desorption pore volume ranging from about 0.03 to about 0.25 cubic centimeters per gram.

REFERENCES:
patent: 2653089 (1953-09-01), Brooke
patent: 4711718 (1987-12-01), Nelson, Jr.
patent: 4746439 (1988-05-01), Newman
patent: 4994191 (1991-02-01), Kuznicki et al.

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