Pressure resistance of copper benzene-1,3,5-tricarboxylate – carbon aerogel composites

Abstract

The protective effect of a resorcinolformaldehyde based carbon aerogel (CA) support was compared in two different forms of the hybrid made of copper benzene-1,3,5-tricarboxilate (HKUST-1) and CA. HKUST-1:CA with identical mass ratio (1:1). HKUST-1+CA is a physical mixture while in HKUST-1@CA the metal organic framework (MOF) crystals were grown on CA under solvothermal conditions. The effect of water vapour and the external pressure (25 -200 bar) was investigated. TG/DTG data show that the prehistory of the samples has a strong influence on their thermal behaviour and nitrogen data suggest that part of the MOF grows in the wider pores of the HKUST-1@CA sample. Although there are no dramatic differences in the water adsorption isotherms, the physical mixture is slightly more proficient. In dry samples under compression the crystalline structure of the free HKUST-1 is well conserved. The nanoscale structure of the hybrids is sensitive to applied pressure and formation of mesopores of wide size distribution occurs. No significant difference was found between the corresponding CH4 adsorption isotherms of the composite samples, either in the as-prepared samples or after compression at 100 bar. After being exposed to high external pressure the CH4 uptake seems to be governed by the MOF.

Improve the Conductivity of CuBTC by in‐situ Reduction to Core‐Shell CuTCNQ@CuBTC

“…The rodlike appearance of the emerging particle was typical for phase I CuTCNQ. [30] The morphology of the CuTCNQ particles was furtherly investigated, after 3 hours of intense ultrasonic treatment in ethanol. The CuTCNQ particles were shaken off from the octahedron, and scatterd spherical and rod-like particles were observed, distinct from the CuBTC octahedron.…”

“…As Table 2 shows, the electronic conductivity of CuBTC was merely 3.84 × 10 À 9 S cm À 1 , agreeing with the insulated property and reported value of CuBTC. [30] The conductivity of composite material CuTCNQ@CuBTC (8 h, 60°C) was improved to 2.79 × 10 À 8 S cm À 1 , by one order of magnitude, owing to the contribution of conductive CuTCNQ shell. With prolonged reaction time, the CuTCNQ shell grew thicker, and therefore the conductivity of core-shell CuTCNQ@CuBTC (24 h, 60°C) increased to 2.94 × 10 À 7 S cm À 1 , by two orders of magnitude.…”

Glucose/Graphene-Based Aerogels for Gas Adsorption and Electric Double Layer Capacitors

“…Sample HA-2 presented the highest CH 4 adsorption capacity of 16.8 mg g −1 at 298 K and 1 bar (Figure 6). Andrea et al synthesized carbon aerogels featuring CH 4 adsorption capacities in the 9.4–23.9 mg g −1 range, which indicated that G/GAs were good adsorbents for CH 4 [31]. However, the adsorption capacity of HA-2 was lower than that of HA-4 at pressures smaller than 0.9 bar, mainly due to the narrow mesoporous structure of the HA-2 sample.…”

Carbon Aerogels for Environmental Clean‐Up

“…Carbon aerogels have been recognized as potential adsorbents for VOC removal due to their superior features , . For example, Francisco et al prepared a carbon aerogel with gallic acid, resorcinol, and formaldehyde, which was further activated by CO 2 .…”