Abstract: A novel photocatalytic material was prepared by compounding nanocrystal film of titanium on surface of the substrate which are light multiporous and recyclable and floated in aqueous phase.Taking wastewater from beneficiation of hydroxamic acid floatation collector with difficult degradation as research subject,the effect factors of the compounding times of crystal film,original concentration of wastewater and pH values on photocatalytic activity of the material were investigated.The results showed that a novel photocatalytic material with good photocatalytic performance was prepared by compounding crystal film for 5 times and roasting at 700 ℃ for 2 hours.Through photodegrading to the N-hydroxy phthalimide collector with concentration of 33 mg/L for 3 hours,the decolorization ratio reached 95.44%.This photocatalytic material still keeps favorable photocatalytic activity when recycled.

Key words: Light multiporous substrate, Novel compound-titanium photocatalytic material, Degradation of flotation collector, N-hydroxy phthalimide