Study On Preparation And Performance Of Zeolite-tio₂-cu₂o Composite Photocatalytic Materials

Lately , because of simplification and high efficiency , integrated photocatalysis system is developing into paricular research field. And research on integrated system of nanomete-semiconductor-photocatalysis and light/Fenton technology is becoming more and more active.In compound photochemical catalysis system's research , the most commonly used semiconductor catalyst nano-TiO₂, but it can only be excited by UV light, reducing the utilization of solar energy. In addition, Fenton reagent has been widely studied,because it can produce a strong oxidation of·OH, but it consume large amounts of hydrogen peroxide, or electricity and their applications are subject to certain restrictions.Nano-cuprous oxide (Cu₂O) is a kind of narrow band gap (Eg = 2.0 eV) of the p-type semiconductor material, which can directly absorb visible light.Therefore Cu₂O has been considered the most potential applications of semiconductor photocatalysts.The present paper belongs to the State Natural Sciences Foundation financing projects (No. 50804035) a foundation experiment's part., natural zeolite as the carrier sol - gel method TiO₂ load in the zeolite, and then were prepared by chemical deposition of zeolite-TiO₂-Cu₂O composite photocatalytic materials.Composite materials properties were characterized by XRD,SEM,TEM,HRTEM,UV-Vis DRS and EDS methods.In addition,decolorization conditions to assess the self-made composite materials on the methylene blue photocatalytic activityThe existing research indicated that the Cu₂O this kind of narrow forbidden band semiconductor visible light catalyst cannot produce·OH directly, but it has the greatly strengthened adsorption oxygen ability, which can return to original state its surface adsorption oxygen the obvious photoexcitation to produce certain oxidized H₂O₂.Therefore we also unique leave the electron, the adsorption oxygen , produce H₂O₂ the nature, the union iron coal micro electrolysis craft use in the medicine waste water the pretreatment: Fe²⁺ and H₂O₂ which produced using the micro electrolytic oxidation return to original state Cu₂O photoproduction composes the Fenton system, produces strong oxidized·OH, moreover under time sunlight ultraviolet ray part illumination,the compound materials TiO₂ may produce·OH directly, and Cu₂O photoproduction H₂O₂ may take the effective conduction band electron capture medicinal preparation, in the certain extent has suppressed the TiO₂ hole and electronic compound, enhanced the photochemical catalysis degeneration rate, finally uses in these two part of·OH oxidation waste water, the pollutant to achieve the pretreatment the goal. The test result showed that this kind of combination craft can effective degeneration this medicine waste water COD, enhance the waste water to be possible greatly the biochemistry.Some reason enhances the photochemical catalysis activeness,such as the synthetic zeolite-TiO₂-Cu₂O compound photochemical catalysis material union zeolite, TiO₂ and Cu₂O various merits, thus possibly has the compound cooperative effect.Solving the present photochemical catalysis material to use in the wastewater disposal process needing the ultraviolet activation the malpractice, to realize the nanometer semiconductor photochemical catalysis technology industrialization possibility to provide the basis, had the good application prospect.