Noble
gases, especially krypton (Kr) and xenon (Xe), are widely applied
in diverse fields. Developing new techniques and adsorbents to separate
and purify Kr and Xe is in high demand. Herein, we reported a bimetallic
metal–organic framework (MOF) (NKMOF-1-Ni) which possesses
a narrow pore size (5.36 Å) and ultrahigh stability (e.g., stable
in water for 1.5 years). Gas sorption measurements revealed that this
MOF possessed much higher uptake for Xe than for Kr, Ar, or N2 at room temperature in all pressure ranges. The calculation
of adsorption isosteric heat and Grand Canonical Monte Carlo simulation
verified that NKMOF-1-Ni had a stronger interaction with Xe than other
tested gases. The results of ideal adsorbed solution theory selectivity
and simulated breakthrough further showed that NKMOF-1-Ni had an outstanding
separation performance of Xe/Kr, Xe/Ar, and Xe/N2. This
study provides important guidance for future research to synthesize
ideal sorbents to separate noble gases.
3-(2-(2-Heptadec-8-enyl-4,5-dihydro-imidazol-1-yl)ethylcarbamoyl)acrylic acid (NIMA), 3-(diallyl-amino)-2hydroxypropyl sulfonate (NDS), acrylamide (AM) and acrylic acid (AA) were successfully utilized to prepare novel acrylamide-based copolymers (named AM/AA/NIMA and AM/AA/NDS/NIMA) which were functionalized by a combination of imidazoline derivative and/or sulfonate via redox free-radical polymerization. The two copolymers were characterized by infrared (IR) spectroscopy, 1 H nuclear magnetic resonance ( 1 H NMR), viscosimetry, pyrene fluorescence probe, thermogravimetry (TG) and differential thermogravimetry (DTG). As expected, the polymers exhibited excellent thickening property, shear stability (viscosity retention rate 5.02% and 7.65% at 1000 s À1 ) and salt-tolerance (10 000 mg L À1 NaCl: viscosity retention rate up to 17.1% and 10.2%) in comparison with similar concentration partially hydrolyzed polyacrylamide (HPAM). The temperature resistance of the AM/AA/NDS/NIMA solution was also remarkably improved and the viscosity retention rate reached 54.8% under 110 1C. According to the core flooding tests, oil recovery could be enhanced by up to 15.46% by 2000 mg L À1 of the AM/AA/ NDS/NIMA brine solution at 80 1C. † Electronic supplementary information (ESI) available: Synthesis routes, and their initial 1 H NMR spectrogram analysis of NDS and NIMA; solution preparation and characterization; fluorescence spectra of different concentrations of copolymer solutions; the composition of synthesized brine for dissolving polymer particle samples in the rheological experiments. See
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