Abstract Using Zn(NO3)2·2H2O, 2-methylimidazole and CH3COONa·3H2O as main raw materials and methanol as solvent, ZIF-8 samples were prepared by hydrothermal reaction at 120 °C. And ZnO was obtained by calcination ZIF-8 in muffle furnace at 600 °C. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), diffuse reflectance spectroscopy (DRS) and thermos gravimetry-differential scanning calorimetry (TG-DSC). The photocatalytic activity of ZnO was investigated by methyl orange which was used as simulated sewage. The results show that the prepared ZnO is irregular, average grain size is about 80 nm, and the band gap width is 3.12 eV. Under UV-light, the degradation rate of 10 mg/L methyl orange is more than 70% in the presence of ZnO, while the degradation rate of methyl orange by commercial P25 is only 40%. The photocatalytic experiments show that the as-prepared ZnO has much higher photocatalytic activity than the commercial P25 photocatalyst. The ZnO is a kind of green photocatalyst which has a wide application prospect in the field of photocatalysis.

中文翻译：

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基于ZIF-8的热分解纳米ZnO的光催化性能及制备

摘要 以Zn(NO3)2·2H2O、2-甲基咪唑和CH3COONa·3H2O为主要原料，甲醇为溶剂，在120 ℃下水热反应制备ZIF-8样品。ZIF-8在马弗炉中600℃煅烧得到ZnO。通过 X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、漫反射光谱 (DRS) 和热重-差示扫描量热法 (TG-DSC) 对样品进行表征。以甲基橙为模拟污水,研究了ZnO的光催化活性。结果表明，制备的ZnO不规则，平均晶粒尺寸约为80 nm，带隙宽度为3.12 eV。在紫外光下，ZnO对10 mg/L甲基橙的降解率超过70%，而商用P25对甲基橙的降解率仅为40%。光催化实验表明，所制备的 ZnO 比商业 P25 光催化剂具有更高的光催化活性。ZnO是一种绿色光催化剂，在光催化领域具有广阔的应用前景。