Functional magnetic microspheres

Details Functional magnetic microspheres Functional magnetic microspheres

1980-01-28

1981-08-25

Granger, Theodore A.

Liquid purification or separation

Processes

Ion exchange or selective sorption

210683, 210688, 210695, 252426, B01D 5316

Patent

active

042858194

ABSTRACT:
Functional magnetic particles are formed by dissolving a mucopolysaccharide such as chitosan in acidified aqueous solution containing a mixture of ferrous chloride and ferric chloride. As the pH of the solution is raised magnetite is formed in situ in the solution by raising the pH. The dissolved chitosan is a polyelectrolyte and forms micelles surrounding the granules at pH of 8-9. The chitosan precipitates on the granules to form microspheres containing the magnetic granules.
On addition of the microspheres to waste aqueous streams containing dissolved ions, the hydroxyl and amine functionality of the chitosan forms chelates binding heavy metal cations such as lead, copper, and mercury and the chelates in turn bind anions such as nitrate, fluoride, phosphate and borate.

REFERENCES:
patent: 3533940 (1970-10-01), Penniston et al.
patent: 3890224 (1975-06-01), Weiss et al.
patent: 4018678 (1977-04-01), Peniston
patent: 4089779 (1978-05-01), Neal
patent: 4108767 (1978-08-01), Cooper
patent: 4110208 (1978-08-01), Neal
patent: 4169804 (1979-10-01), Yapel, Jr.
patent: 4187170 (1980-02-01), Westcott

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