Abstract
Herein, three isomerous Al-BDC-NH2 metal-organic frameworks including CAU-1, CAU-6 and MIL-101-NH2 were synthesized and studied for metronidazole (MNZ) adsorption. In CAU-6, the narrow 1D channel is easily blocked and large proportion of μ-OH groups are invalid due to pore size limitation. The large window entrance of MIL-101-NH2 permits the diffusion of MNZ into the 3D cage, while the oversize access induces a large freedom degree of diffusion and thereby reduces the mass transfer efficiency. The 3D cage with suitable window size of CAU-1 results in the highest adsorption capacity (254.6 mg g-1), via the help of H-bond interaction. The adsorption of MNZ in CAU-1 reaches equilibrium at ∼360 min, and co-existing salts have negligible effects on the adsorption. Besides, CAU-1 can be well regenerated through a simple elution method. Thus, our work demonstrates that CAU-1 can serve as a potential adsorbent for MNZ, and 3D pore with suitable size will promote the capture of small antibiotic molecules.
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