微波均相沉淀法制备纳米ZnO及其光催化性能

Nanosized ZnO Prepared by Microwave Homogeneous Precipitation and Its Photocatalytic Property

以硫酸锌和尿素为原料,采用微波均相沉淀法制备出了纳米ZnO 探讨了反应物配比、反应物浓度、反应时间、反应温度等条件对产物的影响.并用TEM,IR,TGA,XRD,UV-Vis等测试手段对其进行了表征.利用紫外-可见分光光度计测试了光吸收特性,发现纳米ZnO对200～380 nm波长范围的光有很强的吸收性,在可见光范围内也有较强的吸收研究了纳米ZnO光催化降解甲基橙的动力学行为,在紫外光直接照射下,光催化降解甲基橙,以分光光度法测量甲基橙的即时浓度,从而得出了不同条件下甲基橙降解的脱色速率,以比较不同的降解效果.

Using zinc sulfate and urea as raw materials, nanosized ZnO was prepared by homogeneous precipitation under microwave irradiation. The effects of reaction temperature, reaction time, reactant concentrations and reactant ratio on the nanosized ZnO were investigated. TEM, SEM, IR, TGA, XRD and UV-Vis were used to characterize the synthesized ZnO nanoparticles. The UV-Vis absorption property was detected by the UV-Vis spectrophotometer. The results show that the nanosized ZnO has an extremely strong absorption at the wavelength range between 200 and 380 nm, and also a relatively strong absorption at visible region. The photocatalytic degradation of methyl orange by ZnO under UV ray irradiation was studied. The concentration of methyl orange in the ZnO solution was measured by spectrophotometry. The photocatalytic properties of nanosized ZnO synthesized with different methods were compared. The rate constant K was obtained.