球形Cu2O修饰Bi2WO6层状微球的制备及其光催化制取氢气和烷烃的研究

采用水热法制备了Bi2WO6层状微球,通过还原沉淀法在Bi2WO6层状微球内部薄片表面修饰纳米球形Cu2O而制备Cu2O/Bi2WO6复合催化剂.利用X-射线衍射(XRD)、场发射扫描电子显微镜(FESEM)、透射电子显微镜(TEM)、紫外-可见漫反射光谱(UV-visDRS)、荧光光谱(PL)等对复合光催化剂的晶体结构、形貌、光响应性能等进行表征.在Cu2O/Bi2WO6中,100nm左右Cu2O不均匀地附着在1.5μmBi2WO6层状微球的内部的纳米薄片上.通过Cu2O的复合,可以显著提高Cu2O/Bi2WO6对紫外-可见光谱的吸收能力、光生电子-空穴对的分离效率及光催化活性.以丙酸为电子供体,考察了紫外光照射下Cu2O/Bi2WO6分解水制备氢气和烷烃的性能,结果表明:5wt;Cu2O/Bi2WO6的光催化产生氢气和烷烃的性能最佳.

Synthesis of Bi2 WO6 Hierarchical Microsphere Modified by Cu2 O Sphere and Its Photocatalytic Production of Hydrogen and Alkanes

Hierarchical microsphere was prepared by a hydrothermal method , then modified with Cu 2 O sphere by a reduction-precipitation method to obtain Cu 2 O/Bi2 WO6 composites. Phase structure, morphology and optical response property were characterized by XRD , FESEM, TEM, UV-vis DRS and PL.In Cu2 O/Bi2 WO6 composite, 100 nm Cu2 O spheres were nonuniformly adhered to nanoplates of 1.5μm hierarchical microsphere .Modification with Cu 2 O could considerably enhance absorbing ability of ultraviolet-visible light , separation efficiency of photogenerated electron-hole pairs and photocatalytic activity.Using propionic acid as electron donor , performances for production of hydrogen and alkanes via water-splitting process over Cu 2 O/Bi2 WO6 composites have been investigated .Results showed that 5wt%Cu2 O/Bi2 WO6 exhibited better performance for photocatalytic production of hydrogen and alkanes .