期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 2, 期 20, 页码 7179-7187出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta00049h
关键词
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资金
- National Basic Research Program of China [2011CB808703, 2012CB821700]
- National Natural Science Foundation of China [91022030, 21261130584, 21390394]
- 111 project [B07016]
- KAUST [CRG-1-2012-LAI-009]
- Ministry of Education, Science and Technology Development Center Project [20120061130012]
We present two porous organic frameworks (POFs), PAF-1 and JUC-Z2, with ultrahigh iodine capture capacity. The iodine vapor uptake of PAF-1 and JUC-Z2 were 1.86 g g(-1) and 1.44 g g(-1) respectively at 298 K per 40 Pa, which is extremely high for such low pressure sorption conditions. In addition, PAF-1 and JUC-Z2 could adsorb iodine over water with the selectivity of 5.1 and 6.5 respectively. The isosteric enthalpy at zero surface coverage, calculated by a virial equation with the iodine vapor sorption isotherms at 298 K and 313 K of JUC-Z2, reached -51.1 kJ mol(-1), which was much higher than the coverage of PAF-1 (-14.9 kJ mol(-1)). Raman measurement confirmed the polyiodide to be I-5(-) in POFs. Furthermore, solvents with different polarities, such as n-hexane, chloroform, and methanol, were chosen to conduct iodine binding measurements on PAF-1 and JUC-Z2. The formation constant Kf for POFs in n-hexane, chloroform and methanol drastically decreased with the increase in polarity, thus illustrating the important role of solvents in iodine binding.
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