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以硅纳米孔柱阵列(Si-NPA)为衬底,采用溶液浸渍法并通过改变浸渍时间、温度和所用铜盐种类,制备了Cu_2O/Si-NPA,Cu_2O:Cu/Si-NPA(Cu_2O为主相),Cu:Cu_2O/Si-NPA(Cu为主相)和Cu/Si-NPA四种复合纳米结构,并对其表面形貌和微结构以及材料对甲基橙的可见光催化降解性能进行了表征.结果表明,对于面积为1.8 cm×2cm的样品,在光功率密度10 m W/cm~2,波长400~800 nm的可见光辐照100 min后,Cu_2O:Cu/Si-NPA对甲基橙的催化降解率达到~53.6%,较Cu_2O/Si-NPA提高~20%.降解率的提高被归因于Cu_2O中少量金属Cu的存在极大减少了光生电子被缺陷俘获或者与空穴复合的几率,从而有利于光生电子从材料内部到表面的传输,并藉此产生相对于纯相Cu_2O更高的活性含氧基团浓度.该研究结果为进一步提高Cu_2O可见光催化降解有机污染物的效率提供了一种可能的途径.
Cu_2O / Si-NPA and Cu_2O: Cu / Si-NPA (Cu_2O = 0.5) were prepared by sol-gel impregnation method and by changing the immersion time, temperature and the types of copper salts used, using Si- NPA as substrate The main phase), Cu: Cu 2 O / Si-NPA (Cu as the main phase) and Cu / Si-NPA composite nanostructures, and its surface morphology and microstructure and the visible light photocatalytic degradation of methyl orange The results showed that for the samples with the area of 1.8 cm × 2 cm, the Cu_2O: Cu / Si-NPA was irradiated at a light power density of 10 mW / cm ~ 2 and visible light with a wavelength of 400 ~ 800 nm for 100 min The catalytic degradation rate of base orange was-53.6%, which was ~ 20% higher than that of Cu 2 O / Si-NPA.The increase of degradation rate was attributed to the presence of a small amount of metal Cu in Cu 2 O, which greatly reduced the photogenerated electron trapped by defects or holes Recombination probability, which is conducive to the transfer of photogenerated electrons from the interior of the material to the surface, and thus produce a higher concentration of active oxygen-containing groups relative to the pure phase of Cu 2 O. The results of this study to further enhance the photocatalytic degradation of organic pollutants Cu_2O Efficiency provides a possible way.