Fabrication of a hierarchically structured HKUST-1 by a mixed-ligand approach. Issue 66 (24th June 2016)

• Record Type: Journal Article
• Authors: Liu, Baoyu; Li, Yanyan; Oh, Su Cheun; Fang, Yanxiong; Xi, Hongxia
• Is Part Of: RSC advances. Volume 6:Issue 66(2016)
• Page Start: 61006
• Page End: 61012
• Publication Date: 2016-06-24
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra11917d
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Benzoic acid was added to the conventional HKUST-1 synthesis composition as a mixed-linker to fabricate hierarchically structured HKUST-1. Abstract : A novel hierarchically structured HKUST-1 has been synthesized under hydrothermal synthesis conditions using a mixed ligand strategy, in which benzene-1, 3, 5-tricarboxylic acid was partially replaced by benzoic acid. The formation of the crystalline HKUST-1 material containing mesoporosity was characterized by a complementary combination of X-ray powder diffraction, Fourier transform infrared spectroscopy, N2 adsorption–desorption isotherms, scanning electron microscopy, transmission electron microscopy and thermogravimetric analysis. These analyses indicated that incorporation of a certain amount of benzoic acid in the crystal lattice of HKUST-1 preserved its crystal structure. The benzoic acid ligand could be seen as "defect" sites that two carboxylate groups of one linker molecule are missing, leading to a distorted paddle-wheel unit, which induced the formation of an intra-crystalline mesoporous structure in HKUST-1. The hierarchically structured HKUST-1 combines the dual merits of two different pore structures, enabling it has maximum structural function in a limited space due to the enhanced diffusion through mesoporous channels. The presented method opens the door for the preparation of a variety of hierarchically structured MOFs.