期刊
JOURNAL OF MOLECULAR LIQUIDS
卷 283, 期 -, 页码 160-166出版社
ELSEVIER
DOI: 10.1016/j.molliq.2019.03.100
关键词
Metal-organic frameworks; Nanocrystals; Organic dyes; Sorption property
资金
- Project of the Shandong Province Higher Educational Science and Technology Program [J16LC04, J18KA029]
- Natural Science Foundation of Shandong Province, China [ZR2016BL02, ZR2017QB013]
- Natural Science Foundation of Linyi University [LYDX2016BS072]
- Undergraduate Training Program for Innovation and Entrepreneurship of Linyi University [201810452054]
Herein, we report that the surface charge status, adsorption sites, and adsorption spaces in the pore channels of UiO-66-COOH nanocubes can be modulated by changing the mole ratio of H2BDC:H2BDC-COOH in the reaction system. The adsorption capacity of UiO-66-COOH-2 toward the cationic organic dye methylene blue was found to be much higher than that of other UiO-66-COOH adsorbents, whereas UiO-66-COOH-1 nanocrystals exhibited the highest adsorption capacity toward the anionic organic dye Congo red because of the different adsorption mechanisms involved. The adsorption capacity of an adsorbent is determined by the synergetic interplay between the hydrophobic, electrostatic, and pi-pi interactions and the adsorption sites and adsorption spaces in the pore channels. Furthermore, for the first time, we found that UiO-66-COOH nanostructures exhibited gate-opening behavior during the dye adsorption process owing to the free-COOH groups in the pore channels. The obtained results provided new insights into the mechanism of organic dye adsorption by metal-organic frameworks (MOFs). Therefore, this assembly strategy offers new research opportunities for preparing functionalized MOFs with new functions and potential applications. (C) 2019 Elsevier B.V. All rights reserved.
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