Synthesis And Studies On The Properties Of Bi (Ⅲ), Cu (Ⅰ) Series Photocatalyst

In this dissertation, the technology of semiconductor photocatalysis have been overviewed and summarized systemically.The reseach situation of Bi (â…¢)series and CuMO2 photocatalyst are reviewed. On this basis, mechanical grinding with acid prepared Bi2O./BiOCl heterojunction photocatalyst and photocatalytic properties was carried out. Prepared by co-precipitation for Bi2O3/ZnO photocatalyst are successful in degradation the methyl orange under weak UV irradiation, the effect is similar with commercial TiO2. The high-temperature solid phase synthesis method are successful in prepared delafossite structure CuAlO2 and CuFeO2, which are successful in degradation of chlorophenol. the results is very good. The main contents and conclusions are as follows:(1)The mechanical grinding with acid prepared Bi2O3/BiOCl heterojunction photocatalyst are compared with alone Bi2O3, alone BiOCl and commercial TiO2 in the visible light effect. The Bi2O3/BiOCl heterojunction photocatalyst photocatalytic degradation of rhodamine B dye wastewater conditions are optimized and made the conclusion:Rhodamine B solution concentration 20mg/L, catalyst dosage of 0.1 g, illumination time 1h. the solution is about pH=5. reaction temperature is room temperature.Respectively sunlight.8W UV light, metal halogen lamp as light source and found that the best effect is sunlight, followed by metal halogen lamps, light bulbs, the worst effect is 8W UV lamp. Under the optimum conditions, the decolorization rate of Rhodamine B is 99%, CODcr removal rate is 79.6%. Acid prepared heterojunction photocatalyst is superior to mechanical methods.The Strong oxidizing substances produced by Bi2O3/BiOCl heterojunction photocatalytic system under ordinary light bulb was confirmed by fluorescence, indicating rhodamine B dye wastewater was completely degraded.(2)The Bi2O3/ZnO composite photocatalyst are prepared by co-precipitation and investigated their molar ratio on the properties of composite photocatalyst. The best Bi2O3/ZnO molar ratio is 1:1.2. Comparing of solar light and UV light of the photocatalytic effect, we found that the effect of UV light is slightly better than the sunlight. Comparison of solar light photocatalytic effects and UV light photocatalytic effects, ultra-violet decolorization rate reached 83.69 percent, the sunlight was 76.67%. Comparison found Bi2O3/ZnO composite photocatalyst photocatalytic effect is better than single use of Bi2O3, commercial ZnO, and commercial TiO2 photocatalytic effect is consistent. (3)The high-temperature solid phase synthesis were prepared by delafossite structure new photocatalyst CuFeO2 and CuAlO2. The degradation effect of chlorophenol which are estimated by the absorbance removal rate of chlorophenol and chlorine ion removal rate are investigated, respectively.The conclusion is that:in 4h the 100mL 50mg/L chlorophenol are degraded by 50%, CuFeO2 degradation rate is better the CuAlO2.