【摘要】 在微波辐射功率150 W下,通过沉淀法制备了纳米复合材料Ag/ZnO。并通过X-射线衍射(XRD)、紫外-可见漫反射吸收(UV-Vis/DRS)、X射线光电子能谱(XPS)、扫描电镜(SEM)和N2吸附-脱附测定等测试手段对其组成、结构和形貌等进行了表征。结果显示,经功率为150 W的微波辐射处理后,样品的ZnO纤锌矿和Ag立方晶相结构未发生明显变化,但同时,其晶粒尺寸、形貌以及颗粒分布等方面则有较大改变。其中,经150 W微波辐射的样品更多呈现三角形或四边形纳米片堆叠,且大部分粒子呈紧密堆积结构。通过紫外、微波辅助、模拟日光等光催化实验分别考察了该复合材料对罗丹明B的光降解活性,结果显示,在紫外光催化降解罗丹明B的实验研究中,Ag/ZnO表现出了较好的光催化性能,其活性明显高于P25以及沉淀法ZnO等单体催化剂。并且,在模拟日光、微波辐射作用下,该复合材料也具有良好的降解效果。更多还原

【Abstract】 Ag/ZnO nanocomposite material was prepared by the method of precipitation under the irradiation of microwave power 150 W. The phase structures, chemical composition and surface physicochemical properties were well-characterized via X-ray diffraction(XRD), UV-Vis diffuse reflectance absorption(UV-Vis/DRS), X-ray photoelectron spectroscopy(XPS), Scanning electron microscopy(SEM) and N2 adsorption-desorption tests. The results showed that wurtzite ZnO and Ag cubic crystal structure did not change significantly, at the same time, the crystalline size, morphology and particle size distribution were major changed after 150 W microwave-assisted heating treatment of Ag/ZnO. The sample through the 150 W microwave irradiation had formed triquetrous or quadrangular nanoplates stack structure, and most of the particles formed tightly packed structure. The photocatalytic activities of Rhodamine B were investigated by a series of multi-mode photocatalytic experiments such as under UV, microwave-assisted and simulated sunlight irradiation. The results showed that the Ag/ZnO composites expressed better photocatalytic performance in ultraviolet catalytic degradation of Rhodamine B experiment of activities were significantly higher than that of P25, depositing ZnO and other simplex catalyst. And under the effects of simulated sunlight and microwaves, the degradation of Ag/ZnO composite material also has high photocatalytic activity.更多还原