期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 306, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.micromeso.2020.110405
关键词
Metal-organic framework; UiO-67; Continuous flow; Defect engineering; Modulator; Toluene adsorption
类别
资金
- Technology Development Program to Solve Climate Changes [NRF-2017M1A2A2086815, 2017M1A2A2086647]
- Engineering Research Center of Excellence Program through the National Research Foundation (NRF) - Ministry of Science and ICT, Republic of Korea [NRF-2014R1A5A1009799]
Defect engineering is a promising approach for tailoring the physicochemical properties, such as stability, pore structure, and surface area, of metal-organic frameworks (MOFs). In this study, some defective Zr-based biphenyl dicarboxylate (UiO-67 (Zr)) MOFs were prepared via fast modulated synthesis under microwave-assisted continuous flow by using HCOOH, CH3COOH, CH3CH2COOH, and C6H5COOH as modulators. A surface-modified UiO-67(Zr) framework with high porosity and crystallinity could be rapidly produced in a few minutes due to the incomplete exchange between the bridging ligand and the modulator. The defect concentration in the products was tuned by controlling both the modulator species and concentrations utilized. The adsorption ability toward toluene of the prepared UiO-67(Zr) MOFs was found to be related to their structural defects; the defective UiO-67(Zr) MOF synthesized with HCOOH as the modulator exhibited the highest toluene adsorption capacity (467 mg g(-1)), surpassing also most of the previously reported adsorbent materials, such as zeolites, activated carbon, Zr-based dicarboxybenzene (UiO-66(Zr)), H2N-UiO-66(Zr), zeolitic imidazolates, and copper benzenetricarboxylate. Moreover, the experimental dynamic adsorption data were mathematically modeled to predict the adsorption behaviors of defective UiO-67(Zr) MOFs.
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