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利用钛酸丁酯为原料,通过室温强迫水解的方法制备了具有可见光活性的纳米TiO2/微米Cu复合粒子。XPS分析表明复合粒子的表面存在Cu2+、Ti4+、Sn2+元素。场发射扫描电镜观察表明,4nm左右的TiO2颗粒覆盖在铜粉表面形成纳米/微米复合结构,利用空载实验获得表面包覆的TiO2颗粒样品,XRD结果显示TiO2颗粒呈现锐钛矿型,粒径约3.5nm。TG-DTA结果表明复合粒子与原始铜粉具有不同的高温氧化过程,表明TiO2与铜粉之间存在较强的相互作用,而不仅是简单的物理吸附。以甲基橙为模型化合物的降解实验显示出纳米TiO2/微米Cu复合粒子的可见光活性和可重复使用性,8h时照射后甲基橙的降解率达到97%,重复3次实验的降解率保持不变。
The nano-TiO2 / micron Cu composite particles with visible light activity were prepared by forced hydrolysis at room temperature using butyl titanate as raw material. XPS analysis showed that there are Cu2 +, Ti4 +, Sn2 + elements on the surface of the composite particles. Field emission scanning electron microscopy showed that about 4nm TiO2 particles coated on the surface of the copper powder to form nano / micron composite structure, the use of no-load experiment to obtain surface-coated TiO2 particles samples, XRD results show that the anatase TiO2 particles, particle size About 3.5 nm. TG-DTA results show that the composite particles and the original copper powder have different high-temperature oxidation process, indicating that there is a strong interaction between TiO2 and copper powder, not only a simple physical adsorption. Degradation experiments with methyl orange as model compounds showed the visible light activity and reusability of nano-TiO2 / micron Cu composite particles. The degradation rate of methyl orange reached 97% after irradiation for 8h, and the degradation rate of three repeated experiments was maintained constant.