Abstract
Among microporous storage materials copper benzene-1,3,5-tricarboxylate (CuBTC MOF, Cu3(BTC)2 or HKUST-1) holds the greatest potential for clean energy gases. However, its usefulness is challenged by water vapor, either in the gas to be stored or in the environment. To determine the protection potential of graphene oxide (GO) HKUST-1@GO composites containing 0–25% GO were synthesized and studied. In the highest concentration, GO was found to strongly affect HKUST-1 crystal growth in solvothermal conditions by increasing the pH of the reaction mixture. Otherwise, the GO content had practically no influence on the H2, CH4 and CO2 storage capacities, which were very similar to those from the findings of other groups. The water vapor resistance of a selected composite was compared to that of HKUST-1. Powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric (TG/DTG) and N2 adsorption techniques were used to monitor the changes in the crystal and pore structure. It was found that GO saves the copper–carboxyl coordination bonds by sacrificing the ester groups, formed during the solvothermal synthesis, between ethanol and the carboxyl groups on the GO sheets.
Highlights
Since human activity has an increasingly damaging effect on the environment, the reduction of air pollution and the development of green technologies are crucial
We focus on HKUST-1-based systems
Five samples of different graphene oxide (GO) content were synthesized by systematically increasing the GO concentration (1, 1.5, 2, 2.5 g·L−1) in the precursor mixture (Table 1)
Summary
Since human activity has an increasingly damaging effect on the environment, the reduction of air pollution and the development of green technologies are crucial. The rising levels of carbon dioxide in the atmosphere has led to the worldwide problem of climate change. As the transport sector, which contributes significantly to energy consumption at a global level, relies mainly on fossil fuels, it is one of the main sources of carbon dioxide emission [1]. The separation and capture of carbon dioxide would help to alleviate the greenhouse effect. The use of clean energy gases as alternative fuels like natural gas or hydrogen could reduce carbon dioxide emission significantly. Adsorption gas storage seems to be a promising technology for this purpose, but its use requires the development of suitable adsorbents [2]
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