COMPOSITE PHOTOCATALYST FOR REFRACTORY WASTE DEGRADATION

摘要

Abstract of the DisclosureThe invention is concerned with a compositephotocatalyst for refractory waste treatment, comprisingparticles of a wide band gap semiconductor materialselected from the group consisting of titanium oxide,cadmium sulfide and cadmium selenide, the particles beingcoated with a polymer film capable of absorbing a refrac-tory waste substrate to be treated and comprising apyridine-containing polymer and a divalent metal porphyrinor metal phthalocyanine-based dye. The dye is molecularlydispersed throughout the film and chemically bonded to thepyridine-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 about400 nm, the photocalyst of the invention generates in thepolymer film thereof reactive species which are sufficient-ly oxidizing to degrade the refractory waste substrateabsorbed in the polymer film.