纳米针状ZnO的绿色合成及光催化性能研究

Green Synthesis of ZnO Nanoneedles and Photocatalytic Activity Study

中文关键词: 离子液体 氧化锌 亚甲基蓝 光降解

英文关键词: ionic liquid, zinc oxide, methylene blue, photodegradation

中文摘要:

      以Zn(Ac)2·2H2O和NaOH为反应物，以离子液体1-苄基-3-甲基咪唑四氟硼酸盐 ［Bzmim］［BF4］ 水溶液为反应介质，在80 ℃制得纳米针状ZnO。采用扫描电子显微镜（SEM）、X射线衍射（XRD）和紫外-可见吸收光谱（UV-Vis absorption spectra）对纳米ZnO的形貌和结构进行了表征，以有机染料亚甲基蓝溶液为光催化反应模型降解物，考察纳米ZnO的光催化性能。结果表明：制备出的纳米ZnO呈针状，宽约25 nm，长约220 nm，为六方纤锌矿结构。紫外灯照射180 min 后，对亚甲基蓝溶液的降解率可达到97.1％。

英文摘要:

      ZnO nanoneedles have been synthesized by the reaction between Zn(Ac)2·2H2O and NaOH in the ionic liquid 1-benzyl-3-methylimidazolium tetrafluoroborate ［Bzmim］［BF4］ aqueous solution. The morphology and structure of the samples were characterized by means of SEM, XRD and UV-Vis absorption spectra. The photocatalytic performance of ZnO nanopartiles were carried out to degrade methylene blue solution. The results showed that, ZnO nanoneedles were about 25 nm width, 220 nm long and exhibit a typical wurtzite structure. The photocatalytic degradation rate was 97.1% under UV irradiation for 180 min.