氧化锌与真空烧结氧化镍复合粉体的光催化降解研究

采用溶胶凝胶法分别制备了Ni(OH)2和Zn(OH)2前驱体,Ni(OH)2凝胶分别在管式炉和真空烧结炉中制备NiO粉体,Zn(OH)2凝胶在管式炉中烧结制备ZnO粉体。通过X射线衍射仪进行表征,研究了甲基橙在目标催化剂水悬浮液中的光催化降解性能。结果表明:在0.5Pa的氧分压下烧结所得的氧化镍比纯氧化镍光催化性能有所提高,说明适当地引入氧空位,有利于催化剂的电子空穴的分离。氧化锌与0.5Pa的氧分压烧结的氧化镍以质量比为2:1复合时,光催化性能最佳,达到了93.099%,说明氧空位和p-n结的存在综合提高了光催化性能。

Study on Photocatalytic Degradation for Composite Powder with Zinc Oxide and Vacuum Sintering of Nickel Oxide

Ni(OH)2 and Zn(OH)2 precursor were prepared by sol-gel method.Ni(OH)2gel was sintered into NiO powder by a tube furnace and vacuum sintering furnace respectively.Zn(OH)2 gel was sintered into ZnO powder by the tube furnace.The samples were characterized by X-ray diffraction.The photocatalytic degradation of methyl orange in the catalysts aqueous suspension was studied.The results show that the photocatalytic property of the NiO treated under 0.5Pa partial pressure of oxygen is higher than untreated.It explains proper oxygen vacancies introduced can enhance the separation of electron hole pair of catalysts.The composite powder of ZnO and NiO treated at 0.5Pa-vacuum with the complex mass ratio 2:1 has a maximum photodegradation rate 93.099%.It indicates the presence of oxygen vacancies and p-n junction can improve the photocatalytic property.