The Research On The Production And Photocatalysis Property Of Cuprous Oxide

Photocatalysis is emerging as a promising technology for wastewater treatment and water purification. The advantages of this technique over the traditional waste water treatment include complete mineralizaion, high degradation efficiency, low cost, good stability, and the potential to utilize sunlight as UV source. TiO2, as a kind of photocatalyst, can be used to degrade organic contamination with dramatic effects. However, there is also some shortcoming, this kind of matter needs the ultraviolet activation, thus using the visible light as the light energy to processing sewage always is a goal which the scientist pursues. In 1998, Ikeda et al firstly showed that Cu2O could decompose H2O to H2 and O2 in the sunlight. It predicts that Cu2O may be employed as a promising catalyst under visible light. As we know, the quantum efficiency of bulk Cu2O is quite low while increase as thescale of Cu2O transform from micrometer to nanoscale.The aim we pray is to synthesize small-scale nano Cu2O with uniform morphologies by simple method, and then discuss the activities of photocatalysis of nanoCu2O.Cuprous oxide can be prepared from cupric sulfate and sodium sulfite solution.The raw material, such as cupric sulfate and sodium sulfite, is easy to obtain. In this paper, the buffer solution of acetic acid and sodium acetate (HAc-NaAc) is first used to adjust the valve of pH. The sample was analyzedand characterized by using Chemistry Analysis, SEM,XRD, and DTA-TG. The optimal reaction condition of preparing cuprous oxide is confirmed in hydrothermal synthesis.The results of single-factor experiment and orthogonal test experiment of hydrot -hermal synthesis method showed that the main factors which influenced the prepa -ration were reaction time, reaction temperature, the dosage of reactant, and the filling factor. The optimal experiment conditions of the hydrothermal synthesis method were four hours of reaction time and 353K of reaction temperature, the dosage of the buffer reagent was two times as much as the dosage of reactive solution, and the best filling ratio was 0.80. The yield was 92%, the content was98.67%.the Cu2O powder was used to research on the photocalcatalysis performance, and will degrade the main object to decide as the methyl orange to take the organic indica -tor, the self-made nanometer Cu2O powder will be able to playthe very good degeneration role under the visible light illuminationto the methyl orange solution. The results of optimum parameters were as following: the mass concentration of nano-Cu2O 1.3g/L ~1.5g/L ; the initial concentration of methyl orange 20mg/L ~60 mg/L ; the reaction time 70 min; the reaction temperature 0℃～35℃. Regarding the initial density is the 40mg/L methyl orange solution,under the daylight lampilluminati -on, (the solution pH value is 8,catalyst content is 1.5g/L) responded 70 min decoloriz -ation rate mayreach 92.1%, evades the light hidden place decolorization rate to be possible to reach 69.1%.The experiment indicated that H2O2 can accelerate the methyl orange solution's degeneration, but the H2O2 density scope should be controled in 1%. The supersonic stirs may enhance the methyl orange solution degeneration in the initial period , because the temperature increment, the final degeneration rate drop . Useing the self- made nanometer Cu2O recycling, it assumes the drop tendency to the methyl orange solution decolorization effect along with the recycling number of times increase. But recycled nanometer Cu2O still have the better decolorization effect to the methyl orange, after being recycled 7 times, 40 mg/L methyl orange solution decolorization rate might reach to 50%.Finally, the kinetics of the photocatalytic reaction of the of Methly was research -ed . According to the computation , the methyl orange degradation reaction belongs to two levels under most conditions. Under different conditions, the kinetic equati on is different.