다결정성 ZIF-8 분리막의 C3H6/C3H8 kinetic 분리 성능 향상을 목적으로 상대적으로 부피가 큰 2, 4-dimethylimidazole (dmIm)이 ZIF-8 구조 내 2-methylimidazole들을 일부 대체한 혼합 리간드 ZIF-8 유사체 분리막을 이차성장법을 이용 하여 제조하였다. 25°C, 1 bar의 feed 압력에서 C3H6/C3H8 (50/50, V/V) 혼합가스를 대상으로 측정된 분리막의 선택도는 ~180이었으며, 이는 기 보고된 대부분의 다결정성 ZIF-8 분리막들의 선택도보다 높았다. 선택도 향상의 원인인 ZIF-8 구조 내 dmIm 도입으로 인한 기공 입구 크기의 축소를 77 K에서의 질소 등온흡착실험과 Maxwell-Stefan model을 이용하여 C3H6 와 C3H8 막투과도 데이터로부터 계산된 확산계수들을 통해 증명하였다.

Electrochemical oxidation and reduction reactions are fundamental in various conversion and energy storage devices. Functional materials derived from MOFs have been considered promising as electrical catalysts for ORR, HER, and OER, which can be used in Zinc-air batteries and water electrolysis. Herein, we designed a novel approach to fabricating the ultrafine Co9S8 embedded nitrogen-doped hollow carbon nanocages ( Co9S8@N-HC). The method involved a process of sulfidation of cobalt-based metal–organic frameworks (ZIF67) and then coating them with polypyrrole (PPy). PPy has notable properties such as high electrical conductivity and abundant nitrogen content, rendering it highly promising for catalytic applications. The Co9S8@ N-HC catalyst was successfully synthesized via the carbonization of CoSx@ PPy. Remarkably, the Co9S8@ N-HC catalyst demonstrated exceptional electrocatalytic activity, requiring only low overpotentials of 285 mV and 201 mV at 10 mA cm‒ 2 for OER and HER, respectively, and exhibited high activity for ORR, with an onset potential ( Eonset) of 0.923 V and half-wave potential ( E1/2) of 0.879 V in alkaline media. The electrocatalytic efficiency displayed by Co9S8@ N-HC opens a new line of research on the synergistic effect of MOF-PPy materials on energy storage and conversion.

Herein, facile room-temperature self-assembly and high-temperature pyrolysis strategy was successively conducted for in situ synthesizing novel TiO2/ TiN@N-C heterostructure by using typical sandwich-like precursors (MXene/ZIF-8). Zerodimensional (0D) TiO2, TiN and N-doped carbon nanoparticles were in situ formed and randomly anchored on the twodimensional (2D) N-doped carbon substrate surface, making TiO2/ TiN@N-C exhibit unique 0D/2D heterostructure. Relative to the extensively studied ZIF-8-derived N-doped carbon nanoparticles, TiO2/ TiN@N-C heterostructure displayed greatly boosted electrochemical active specific surface. Benefiting from the enhanced electrochemical property of TiO2/ TiN@N-C heterostructure, remarkable signal enhancement effect was achieved in terms of the oxidation of multiple hazardous substances, including clozapine, sunset yellow and benomyl. As a result, a novel electrochemical platform was constructed, the linear detection range were 10–1000 nM, 2.5–1250 nM, 10–1000 nM while the detection limits were evaluated to be 3.5 nM, 1.2 nM, 4.5 nM for clozapine, sunset yellow and benomyl, respectively. Besides, the practicability of the newly developed electrochemical method was verified by assessing the content of clozapine, sunset yellow and benomyl in real food samples.

A series of ZIF-67-C-IL catalysts were prepared using ZIF-67 and 1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl] imide ([ BMIM]NTf2) ionic liquid as precursors. The structure of the catalysts was characterized by XRD, TEM, SEM and XPS. The catalytic performance of the catalysts for the oxygen reduction reaction (ORR) was evaluated in a three-electrode system. The results confirmed that the high-temperature treatment of the precursors resulted in the formation of N, S codoped carbon-encapsulated Co9S8 nanoparticles. To create N, S co-doped carbon coated Co9S8 nanoparticle catalysts, ionic liquids are used as sulfur and nitrogen sources. The catalytic activity of ORR can be improved using N, S co-doped carbon to prevent the aggregation of Co9S8 nanoparticles. Graphitized and N, S co-doped carbon shells are optimal for achieving high activity stability. Optimal 600-ZIF-67-C(1:1.5)-30IL catalytic activity was observed for ORR. The half-wave potential of ORR was 0.88 V vs. RHE in 0.1 mol L− 1 KOH, with a limit current density of 4.70 mA cm− 2. Similar ORR electrocatalytic activity was observed between this catalyst and commercial Pt/C (20 wt%).

Zeolitic imidazolate frameworks (ZIFs) along with carbon nanofibers and polyaniline composite have been explored as an electrochemical sensing platform in nitrite measurement at trace level. Owing to their topology, high surface area and porous structure, these metal–organic frameworks (MOFs) find widespread utility in different application domains. Nitrites are widely used as preservatives in dairy, meat products, and packaged food stuffs. They form N-nitrosamines, which are potential carcinogens and cause detrimental health effects. These ZIF-based MOFs along with carbon nanofibers and polyaniline have emerged as an efficient electrochemical sensing material. The composite has been characterized by X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and BET surface area studies. The electrochemical performance of the composite has been evaluated by forming as a thin film of composite on the surface of glassy carbon electrode and studying its impedance as well as electrochemical sensing behavior. The sensor exhibited good analytical response in nitrite measurement with a limit of detection of 8.1 μM. The developed sensing platform has been successfully applied to quantify the nitrite levels from water samples. The results obtained are in good agreement with the results of standard protocol.

An environmentally friendly and low-cost chitosan-containing polysaccharide (CP) composite ZIF-8/CP was designed and prepared based on the difficulty of separating the traditional adsorbent from the water phase. ZIF-8/CP was synthesized through in-situ growth approach. The physical, chemical and structure properties of ZIF-8/CP were determined through a series of characterization methods, including SEM, FT-IR and PXRD. The effects of touch time, pH, temperature, and coexisting ions on adsorption were assessed. In addition, kinetics, isotherms of adsorption and thermodynamics were examined. The data of isotherms for adsorption indicated that the adsorption of ZIF-8/CP on MG was similar to the Langmuir model, with a maximum adsorption capacity of 1428.57 mg/g. Moreover, the kinetic parameters were consistent with the pseudo- 2nd-order equation. Thermodynamic studies (ΔG < 0, ΔH > 0) demonstrated a heat-absorbing and spontaneous adsorption process. Our study reveals that ZIF-8/CP has good adsorption properties and environmental properties.

본 연구에서는 PEBAX 2533에 합성된 PEI-GO@ZIF-8의 함량을 달리 첨가하여 혼합막을 제조하고 N2와 CO2의 투과 특성을 연구하였다. PEBAX/PEI-GO@ZIF-8 혼합막의 N2 투과도는 PEI-GO@ZIF-8 함량이 증가함에 따라 감소하였고, CO2 투과도는 PEI-GO@ZIF-8 함량에 따라 다른 경향을 보였는데 순수 PEBAX 막에서 PEI-GO@ZIF-8 0.1 wt%까지 CO2 투과도는 증가하다가 그 이후의 함량에서는 감소하였다. PEI-GO@ZIF-8 0.1 wt% 혼합막은 CO2 투과도 221.9 Barrer, CO2/N2 선택도는 60.0으로, 제조된 혼합막들 중 CO2 투과도와 CO2/N2 선택도가 향상되어 가장 높은 투과 특성을 보였고 Robeson upper-bound에 도달하는 결과를 얻었다. 이는 충진물이 PEBAX 내에 고루 분산되면서 CO2와 친화적인 상호작용을 하는 GO의 -COOH, -O-, -OH 작용기와 PEI에 결합된 아민기 그리고 CO2에 대해 gate-opening 현상이 일어나는 ZIF-8의 영 향 때문이다.