Study On Preparation And Properties Of Nano Cu₂O And Its Composites Material

As a narrow band gap semiconductor material,cuprous oxide?Cu₂O?can be inspired by visible light in the wavelength range of 400-800 nm to product electron-hole pairs,which makes it a promising material in the field of photo catalytic degradation of pollutants.However,there is also exists some problems which affecting it's industrial applications,such as low quantum efficiency of single phase photocatalysts,poor adsorption of nanomaterials and difficulties in recovery.Therefore,in order to improve the photocatalytic performance of Cu₂O.Ag/Cu₂O nano composites,Cu₂O micro-nanomaterials under different parameters and ATP/Cu₂O composites materials were prepared in this paper.The contents of this paper are summarized as follows:1.The core-shell Ag/Cu₂O nanocomposites were prepared by the polyol and liquid phase reduction method.The samples with different composition were obtained by changing the amount of suspension with Ag nanorods,and the formation mechanism of the composites were discussed preliminarily.In terms of the photocatalytic mechanism of the semiconductor materials,the effect of the content of Ag nanorods on the catalytic performance of the composites was studied.The experimental results show that with the increase of the Ag content the photocatalytic performance of the composites firstly increased and then decreased,and the sample?S5?which prepared with 9 ml Ag nanorods has the best photocatalytic performance.After visible light irradiation for 6h,the photocatalytic degradation rate of MO can reach to 80.5%,while pure Cu₂O only can reach to 52.8%under the same conditions.In addition,we also carried out a preliminary study on the catalytic effect of composite materials in dark condition,and found that sample S5 also has the best catalytic performance;the catalytic decolorization rate to MO can reach to 75.9%after reaction for 72 h.2.The Cu₂O micro-nanomaterials were prepared by chemical reduction method using glucose(C₆H₁₂O₆·H₂O)as reducing agent.The effects of reaction time and temperature on the phase,morphology and photocatalytic properties of micro-nanomaterials were researched.And we carried out further study of the catalytic behavior to MO in dark condition.The results showed that with the extension of reaction time,the photocatalytic degradation efficiency of Cu₂O micro-nanomaterials to MO firstly increased and then decreased,among which,the sample prepared at a reaction time of 60min has best catalytic degradation efficiency under visible light.In the variable system of reaction temperature,Cu₂O samples prepared at lower temperatures?40°C,50°C,and 60°C?have better photocatalytic performance than the samples prepared at higher temperature?70°C and 80°C?.When the reaction temperature is 60°C,the photocatalytic efficiency of sample reached the maximum,and the degradation rate of MO can reach to 92.5%under visible light irradiation for 60 min.In addition,the catalytic decolorization rate to MO of Cu₂O samples prepared at 60°C can reached to 89.1%after reaction for 24 h in dark,and in total amount of decolorization rate,the 33.3%for adsorption 55.8%for degradation,which proves that the catalytic behavior in dark is mainly caused by degradation.3.ATP/Cu₂O micro-nano composite materials were prepared by compounding Cu₂O and ATP via chemical reduction method.The photocatalytic degradation rate of MO by ATP/Cu₂O composites material was studied,and the composites material was applied to the preparation of photocatalytic modified coatings then.The photocatalytic degradation propertie to toluene by modified coating was also tested.The results showed that after 60min of visible light irradiation,the degradation rate of MO by ATP/Cu₂O composites can reach to 94.6%.Compared with 92.5%that pure Cu₂O reached under the same conditions,the composites exhibited better photocatalytic activity.The photocatalytic degradation of toluene revealed that the modified waterborne anticorrosive paints prepared under different ATP/Cu₂O additions all exhibited catalytic degradation performance to toluene under visible light irradiation.And with the increase of the addition amount of ATP/Cu₂O,the degradation efficiency of toluene firstly increased and then decreased,among which the sample S3 has best catalytic degradation performance to toluene,and the reduction percentage can reache to47.4%after 24 h under visible light irradiation.