610-92-4Relevant articles and documents
Exploiting Diffusion Barrier and Chemical Affinity of Metal-Organic Frameworks for Efficient Hydrogen Isotope Separation
Kim, Jin Yeong,Balderas-Xicohténcatl, Rafael,Zhang, Linda,Kang, Sung Gu,Hirscher, Michael,Oh, Hyunchul,Moon, Hoi Ri
, p. 15135 - 15141 (2017)
Deuterium plays a pivotal role in industrial and scientific research, and is irreplaceable for various applications such as isotope tracing, neutron moderation, and neutron scattering. In addition, deuterium is a key energy source for fusion reactions. Thus, the isolation of deuterium from a physico-chemically almost identical isotopic mixture is a seminal challenge in modern separation technology. However, current commercial approaches suffer from extremely low separation efficiency (i.e., cryogenic distillation, selectivity of 1.5 at 24 K), requiring a cost-effective and large-scale separation technique. Herein, we report a highly effective hydrogen isotope separation system based on metal-organic frameworks (MOFs) having the highest reported separation factor as high as ～26 at 77 K by maximizing synergistic effects of the chemical affinity quantum sieving (CAQS) and kinetic quantum sieving (KQS). For this purpose, the MOF-74 system having high hydrogen adsorption enthalpies due to strong open metal sites is chosen for CAQS functionality, and imidazole molecules (IM) are employed to the system for enhancing the KQS effect. To the best of our knowledge, this work is not only the first attempt to implement two quantum sieving effects, KQS and CAQS, in one system, but also provides experimental validation of the utility of this system for practical industrial usage by isolating high-purity D2 through direct selective separation studies using 1:1 D2/H2 mixtures.
A water-based and high space-time yield synthetic route to MOF Ni2(dhtp) and its linker 2,5-dihydroxyterephthalic acid
Cadot, Stphane,Veyre, Laurent,Luneau, Dominique,Farrusseng, David,Alessandra Quadrelli, Elsje
, p. 17757 - 17763 (2014)
2,5-Dihydroxyterephthalic acid (H4dhtp) was synthesized on an 18 g scale by carboxylation of hydroquinone in molten potassium formate. The hydrated form of the Ni2(dhtp) MOF (also known as CPO-27-Ni and MOF-74(Ni)) was obtained in 92% yield by refluxing for 1 h a water suspension of the H4dhtp linker with an aqueous solution of nickel acetate. The ensuing characterization of the material (XRD, HRTEM, TGA, N2 adsorption at 77 K-SBET = 1233 m2 g-1) confirmed the formation of a metal-organic framework of at least equal quality to the ones obtained from the previously reported routes (CPO-27-Ni and MOF-74(Ni)), with a different morphology (namely, well-separated 1 ??m platelets for the herein reported water-based route). The temperature dependence of the magnetic susceptibility was measured and satisfactorily simulated assuming a Heisenberg (H = -2JΣSiSi+1) ferromagnetic intrachain interaction (J = +8.1 cm-1) and an antiferromagnetic interchain interaction (J′ = -1.15 cm-1). Overall, the reaction in water appears to follow easily distinguishable steps, the first being the deprotonation of H4dhtp by an acetate counterion, leading to a soluble nickel adduct of the linker, en route to the MOF self-assembly. This journal is
Coordinated Molecule-Modulated Magnetic Phase with Metamagnetism in Metal-Organic Frameworks
Son, Kwanghyo,Kim, Jin Yeong,Schütz, Gisela,Kang, Sung Gu,Moon, Hoi Ri,Oh, Hyunchul
, p. 8895 - 8899 (2019)
Most well-known metal-organic frameworks (MOFs) possessing the magnetic Ni2O2(CO2)2 chains, called Ni-MOF-74, have been investigated with regard to magnetic properties at open-metal sites. We present the modulat
Metallic tungsten carbide nanoparticles as a near-infrared-driven photocatalyst
Huang, Weicheng,Meng, Hongxue,Gao, Yan,Wang, Jinxin,Yang, Chunyu,Liu, Danqing,Liu, Jian,Guo, Chongshen,Yang, Bin,Cao, Wenwu
, p. 18538 - 18546 (2019/08/12)
Employing near infrared (NIR) light for photocatalytic reactions is preferable, considering effective solar utilization. Herein, the metalloid of tungsten carbide (WC) was used as an NIR-driven photocatalyst for the photodegradation of organic pollutants for the first time. The noble metal-like electronic properties of WC were proven via the analysis of its electronic occupied state using ultraviolet photoelectron spectroscopy and valence band XPS. In addition, both the experimental evidence and 3D finite element simulation revealed the NIR-responsive localized surface plasmon resonance (LSPR) behavior of the WC nanoparticles. Accordingly, the WC nanoparticles exhibited excellent UV-visible-NIR full-spectrum absorption, high NIR-triggered photocurrent response and resultant NIR-driven photocatalytic degradation performance. The NIR-mediated photocatalytic mechanism of WC was proposed based on a radical scavenging test, fluorescence observation of radical generation and spin-trapping electron paramagnetic resonance measurements. Hence, metallic WC with NIR absorption and photocatalytic activity may pave the way for the design of full-solar-spectrum-responsive photocatalysts.
