摘要
由于二氧化钛和氧化亚铜具有优异的光催化性能,从而被广泛应用于许多领域,如降解污染物,自清洁的涂料等.设计一种反应温度为180℃和反应时间为3 h的溶剂热方法,以乙二醇作为溶剂,硝酸铜作为反应试剂,在聚乙烯吡咯烷酮(PVP)作为表面活性剂,合成具有球状结构的Cu_2O颗粒.进一步以酞酸四丁酯(TBOT)为钛源,采用溶剂热法合成具有核/壳结构的Cu_2O@TiO_2球状颗粒.这种具有核壳结构的复合材料形成p-n异质结.创新点在于在两种不同半导体金属氧化物之间成功形成均匀的核壳异质结.所制备的样品采用带有能谱(EDS)仪的扫描电子显微镜,透射电子显微镜(TEM)和X射线衍射(XRD)对样品形貌进行表征.在室温条件下,以500 W氙灯为光源,对甲基橙(MO)溶液进行光催化降解测试.结果表明,产物的光催化性能明显高于Cu_2O和TiO_2光催化性能.
Due to excellent photocatalytic properties,titanium dioxide and cuprous oxide have been widelyused in many fields,such as degradation of pollutants,self-cleanning coating,and so on.In this study,we de-sign a solvothermal method to synthesize Cu2O spheres,employing ethylene glycol as a solvent and copper ni-trate as reagents in the presence of polyvinyl pyrrolidone（PVP） as surfactant at 180 ℃ for 3 h.TheCu2O@TiO2core/shell spheres were prepared by the vapor – thermal method using TBOT as the titaniumsource.Thus,A p-n junction is formed by joining a p-type（Cu2O）and an n-type（TiO2）semiconductor to-gether.The innovative point in this work is that the uniform core-shell heterojunction structures are formedsuccessfully between the two different types of semiconductor.The as-prepared products were characterizedby scanning electron microscopy equipped with X-ray energy dispersive spectroscopy（EDS）capabilities,transmission electron microscopy（TEM）and X-ray diffraction（XRD）. The photocatalytic activity of the as-prepared products was evaluated by the photodegradation of MO under visible light irradiation at the roomtemperature.A 500 W Xe arc lamp was used as the light source.The results show that the photocatalytic per-formance of the products was obviously higher than that of Cu2O and TiO2 photocatalytic performance.
出处
《淮北师范大学学报（自然科学版）》
CAS
2017年第1期41-45,共5页
Journal of Huaibei Normal University：Natural Sciences
基金
安徽省高等学校省级自然科学研究项目(KJ2014B11
KJ2016A638)
淮北市科技人才培育计划项目(20140318
20140305)
淮北师范大学校级青年基金项目(2014xq017)
关键词
氧化亚铜
核壳结构
光催化
异质结
cuprous oxide
core-shell structure
photocatalytic
heterojunction
