期刊
MATERIALS
卷 10, 期 2, 页码 -出版社
MDPI AG
DOI: 10.3390/ma10020205
关键词
UiO-66; adsorption behavior; adsorption mechanism; acid orange 7
类别
资金
- National High Technology Research and Development Program (863 program) of China [2012AA06A111]
- Hubei Provincial Natural Science Foundation of China [2014CFB552]
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials of China [000-01647909]
Zirconium based metal organic frameworks (Zr-MOFs) have become popular in engineering studies due to their high mechanical stability, thermostability and chemical stability. In our work, by using a theoretical kinetic adsorption isotherm, we can exert MOFs to an acid dye adsorption process, experimentally exploring the adsorption of MOFs, their external behavior and internal mechanism. The results indicate their spontaneous and endothermic nature, and the maximum adsorption capacity of this material for acid orange 7 (AO7) could be up to 358 mgg(-1) at 318 K, estimated by the Langmuir isotherm model. This is ascribed to the presence of an open active metal site that significantly intensified the adsorption, by majorly increasing the interaction strength with the adsorbates. Additionally, the enhanced delocalization and suitable pore size of UiO-66 gave rise to the highest host-guest interaction, which further improves both the adsorption capacity and separation selectivity at low concentrations. Furthermore, the stability of UiO-66 was actually verified for the first time, through comparing the structure of the samples before and after adsorption mainly by Powder X-ray diffraction and thermal gravimetric analysis.
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