Abstract
Zeolitic imidazolate framework-8 (ZIF-8) is synthesized quickly at room temperature in methanol with the support of ultrasound. Porous ZnO is also prepared via the thermal treatment of ZIF-8. The photocatalytic activities of the obtained materials are demonstrated via methylene blue (MB) decomposition under UV radiation. The obtained materials are characterized by means of X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), nitrogen adsorption/desorption isotherms, UV-Vis diffuse reflectance spectra (DR-UV-Vis), and photoluminescence spectra. The results indicate that ZIF-8 and the materials obtained from ZIF-8 by heating in the air have photocatalytic activity under UV irradiation. The ZnO sample obtained by ZIF-8 calcination at 660°C for 5 h has the highest photocatalytic activity. However, the MB degradation photocatalytic efficiency of the ZnO samples is even lower than that of the ZIF-8 samples, indicating that ZIF-8 is an effective photocatalyst in the treatment of environmental pollution.
Highlights
Zeolitic imidazolate framework 8 (ZIF-8) is a hybrid material of zinc ions with 2-methylimidazole, forming crystals in the cubic space group I43m (a = 16:991 Å) [1, 2]
Studies on ZIF-8 have become attractive after the work by Cravillon et al [35], who reported the rapid synthesis of nanostructured ZIF-8 crystals at room temperature in the methanol solution of zinc (II) nitrate and meIm
We present a rapid ultrasound-assisted method for synthesizing ZIF-8 in methanol and, the manufacture of porous Zinc oxide (ZnO) by heating ZIF-8 in the air
Summary
Studies on ZIF-8 have become attractive after the work by Cravillon et al [35], who reported the rapid synthesis of nanostructured ZIF-8 crystals at room temperature in the methanol solution of zinc (II) nitrate and meIm. After that, Bux et al [36, 37] utilized other metal precursors in methanol and the coating method to successfully produce ZIF-8 films on titania and α-alumina, McCarthy et al [38] and Venna and Carreon [39] synthesized ZIF-8 membrane in methanol at room temperature with α-Al2O3 support. The photocatalytic activity of the obtained material is assessed through methylene blue decomposition under UV radiation
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