基于ZIF-8/C制备ZnO/C复合材料及光催化性能的研究

Photocatalytic performance of ZnO/C Composite materials based on ZIF-8/C

本文采用常温搅拌法将Zn(NO_3)2·6H_2O、活性炭粉和2-甲基咪唑溶于甲醇中,得到一系列含不同质量分数活性炭粉的ZIF-8/C材料,500℃下煅烧,得到ZnO/C复合材料。利用傅里叶红外光谱(Fourier transform infrared spectroscopy,FT-IR)、孔径分布分析仪(Pore diameter analysis apparatus)、紫外-可见吸收光谱(UV-visible absorption spectra)、场发射扫描电子显微镜(Field emission scanning electron microscopy,FE-SEM)和X射线粉末衍射(Powder X-ray diffraction,PXRD)对前驱体和目标产品进行表征分析。这些结果表明前驱体和目标产品中分别含有ZIF-8和ZnO,加入活性炭粉可以拓展ZnO光催化剂的吸收光谱范围。目标产品具有介孔和大孔结构,其中ZnO/C-2的粒径更为均一。另外,在可见光和紫外光下考察目标产品对有机染色剂亚甲基蓝的光催化降解性能和稳定性。实验结果表明:目标产品ZnO/C-2的光催化性能最佳。

In this paper,a series of ZIF-8/C composite materials with different mass fractions of activated carbon were prepared by Zn(NO 3) 2·6H 2O,activated carbon and 2-methylimidazole by stirring at normal temperature.After calcining at 500℃,ZnO/C products were obtained.Then,the precursor and product were characterized and analyzed by fourier transform infrared spectrum(FT-IR),pore diameter analysis apparatus,UV-visible absorption spectra,field emission scanning electron microscope(FE-SEM)and powder X-ray diffraction(PXRD).The results showed that there were ZIF-8 and ZnO in the precursor and product,respectively.With the addition of activated carbon,the products expanded the range of UV-visible absorption spectra.The pore diameter results showed that the product had mesoporous structure and large pore size distribution.Among them,ZnO/C-2 had uniform-sized particles.In addition,the photocatalytic activity and stability of catalysts were evaluated by decolorization of methylene blue under visible-light and UV light.The experimental results showed that ZnO/C-2 exhibited the best photocatalytic activity for dye degradation.