Composite photocatalyst for refractory waste degradation

Details Composite photocatalyst for refractory waste degradation Composite photocatalyst for refractory waste degradation

B - Operations, Transporting

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252/52.D, 204/91

B01J 31/22 (2006.01) B01J 31/06 (2006.01) B01J 31/26 (2006.01) B01J 31/38 (2006.01) C02F 1/32 (2006.01)

Patent

CA 1287829

Abstract of the Disclosure The invention is concerned with a composite photocatalyst for refractory waste treatment, comprising particles of a wide band gap semiconductor material selected from the group consisting of titanium oxide, cadmium sulfide and cadmium selenide, the particles being coated with a polymer film capable of absorbing a refrac- tory waste substrate to be treated and comprising a pyridine-containing polymer and a divalent metal porphyrin or metal phthalocyanine-based dye. The dye is molecularly dispersed throughout the film and chemically bonded to the pyridine-containing polymer. Upon mixing of the photo- catalyst with the refractory waste substrate and irradi- ation with light having a wavelength of about 300 to about 400 nm, the photocalyst of the invention generates in the polymer film thereof reactive species which are sufficient- ly oxidizing to degrade the refractory waste substrate absorbed in the polymer film.

519650

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