Nanopolyhedrons and mesoporous supra-structures of Zeolitic Imidazolate framework with high adsorption performance

Zeolitic Imidazolate framework (ZIF-90) polyhedron (Zn(ICA)-1) was synthesized via diffusion of triethlyamine (TEA) and hexane solution into the N,N'-dimethylformamide (DMF) solution of imidazole-2-carboxyaldehyde (ICA) and Zn(NO3)(2)center dot 6H(2)O at room temperature. And suprastructure (Zn(ICA)-2) were synthesized via direct addition of TEA to the N,N'-dimethylformamide (DMF) solution of imidazole-2-carboxyaldehyde (ICA) and Zn(NO3)(2)center dot 6H(2)O at room temperature. The scanning electron microscopy (SEM) measurement indicated that the sample of Zn(ICA)-1 showed polyhedron morphology with the diameter of 300-400 nm and the sample of Zn(ICA)-2 showed super-structural morphology. XRD results indicated that Zn(ICA)-1 has the crystalline structure of ZIF-90 and Zn(ICA)-2 is amorphous. The gases adsorption measurement results showed that the sample Zn(ICA)-2 exhibited mesoporous structure. (C) 2012 Elsevier Inc. All rights reserved.