乙醇淬火对纳米CuO光催化剂的改性研究

设计了一种通过乙醇淬火来修饰纳米氧化铜表面的简单方法。首先将纳米氧化铜加热至800 ℃, 然后立即浸入无水乙醇中淬火。通过罗丹明B的光催化降解表明, 在紫外-可见光照射下, 表面修饰后的纳米氧化铜比修饰前的纳米氧化铜具有更好的光催化性能。电子顺磁共振测试表明, 通过快速的无水乙醇淬火, 氧化铜中出现了高浓度的氧空位, 这些氧空位有效地提升了氧化铜的光催化性能; X射线衍射和光电子能谱测试表明, 通过无水乙醇淬火, 氧化铜中出现了氧化亚铜和铜, 这可能会形成CuO-Cu₂O异质结以及Cu-CuO/Cu₂O肖特基异质结, 促进电荷-空穴分离, 有效地提升改性氧化铜的光催化性能。实验表明溶剂淬火方法能有效地修饰金属氧化物的表面, 增加氧化物中的表面氧空位, 甚至形成异质结, 提高材料的表面活性。

A Study of the Modification of Nano-CuO Photocatalyst by Ethanol Quenching

A facile method is developed to modify the surface of nano-CuO by absolute ethanol quenching was developed, which results in enhancing the photocatalytic performance. The nano-CuO is heated to a high temperature (800 ℃) and immediately quenched by submersion in absolute ethanol. The photocatalytic decomposition of rhodamine B demonstrates that, under ultraviolet light irradiation, a better photocatalytic performance is achieved with our modified CuO. The characterization of the samples indicates that by absolute ethanol quenching, the interaction between hot CuO and absolute ethanol leads to the introduction of a high concentration of oxygen vacancies on the surface of the Nano-CuO. The CuO-Cu₂O heterojunctions and Cu-CuO/Cu₂O Schottky heterojunctions may be formed as well because of the Cu₂O and Cu reduced by absolute ethanol. This further illustrates that the ethanol quenching method can effectively modify the surface of metal oxides, increase surface oxygen vacancies on the oxides, even form heterojunctions, and improve the photocatalytic performance of the materials.