硬脂酸修饰纳米氧化锌的制备及可见光光催化性能研究

Preparation of stearic acid-modified ZnO nanomaterials and their photocatalytic properties under visible light irradiation

以硫酸锌和氢氧化钠为原料,硬脂酸为修饰剂,采用一步沉淀法制备出硬脂酸修饰的纳米ZnO,并对可见光光催化性能进行了研究。借助XRD、TEM、FTIR、UV-vis等测试手段对硬脂酸修饰的纳米ZnO进行表征。结果表明,硬脂酸修饰的纳米ZnO分散比较均匀,硬脂酸与纳米氧化锌之间形成了化学键,而且硬脂酸修饰后,纳米ZnO更易被可见光激发,当甲基橙初始浓度为5 mg/L,硬脂酸修饰的纳米ZnO投加量为10 mg/L,光照时间70 min,硬脂酸修饰的纳米ZnO对甲基橙的降解率达到82.3%。

Nanometer stearic acid-modified ZnO was prepared with one step precipitation method using zinc sulfate and sodium hydroxide as raw material,and its photocatalytic properties under visible light irradiation was also studied. X-ray diffraction,Transmission electron microscope,Infrared spectrometer and ultraviolet visible spectrophotometer were used to characterize the doped nanometer ZnO. The results showed nanometer stearic acid-modified ZnO dispersed well and chemical bonds formed between stearic acid and ZnO. Furthermore,nanometer stearic acid-modified ZnO was easier to be irradiated by visible light than that without any modification. Additionally,the photocatalytic properties of stearic acid-modified ZnO were finally investigated with methyl orange solution as the degradation model. The degradation rate of methyl orange can reach 82. 3% under the following conditions： the original concentration of methyl orange of5 mg /L,light catalyst dosage of 10 mg /L and illumination time of 70 min.