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摘要
A series of 3-[2-(2-aminoethylamino) ethylamino] propyl-trimethoxysilane (PAPTS) grafted on Materials of Institute Lavoisier-101(Cr) [MIL-101(Cr)] porous adsorbent with varied PAPTS loadings were synthesized and characterized by powder X-ray diffraction patterns (PXRD), N-2 adsorption-desorption measurement at 77 K, Fourier transform infrared spectroscopy (FTIR), and thermal gravimetric analysis (TGA). The water vapor adsorption isotherms were obtained by gravimetric method. Water adsorption isotherms and dynamic on MIL-101 as well as PAPTS-MIL-101(Cr) are discussed simultaneously. Results indicated that even though the Brunauer-Emmett-Teller (BET) surface areas of PAPTS-MIL-101(Cr)-0.5 and PAPTS-MIL- 101(Cr)-0.75 were reduced by approximately 50% compared with that of the original MIL-101(Cr), which have slightly higher water uptake capacities in a region of 0.30 < P/P-0 < 0.40. The reduction in the BET surface area is offset by increasing hydrophilicity for the adsorption of water. PAPTS-MIL-101 (Cr)-0.5 exhibited very fast adsorption rate, and the adsorption rate constants of water vapor were 0.0206 and 0.202 min(-1) for the initial and final stages of the adsorption process, respectively. Therefore, these superior water vapor adsorption performances of PAPTS grafted on MIL-101(Cr) have great potential for application in adsorption heat pumps.
- 出版日期2018-3-24
- 单位北京工业大学
