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Preparation and enhanced CO2 adsorption capacity of UiO-66/graphene oxide composites
Yan Cao,Qin Zhong,Yunxia Zhao,Zijian Lv,Fujiao Song 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.27 No.-
New composites of UiO-66 and graphene oxide (GO) were synthesized and tested as CO2 adsorbents atroom temperature. The materials and the parent composite components were characterized using X-raydiffraction (XRD), thermo-gravimetric analysis (TGA), nitrogen adsorption–desorption isothermanalysis, scanning electron microscopy (SEM), and FT-IR spectroscopy. The CO2 isotherms on theUiO-66/GO composites and the UiO-66 were measured by a static volumetric method separately. Experiments of multiple adsorption/desorption cycles were conducted to estimate reversibility of CO2on the UiO-66/GO. The results showed that the BET surface area of the composites was higher than thatof the parent UiO-66, and the adsorption capacities of CO2 on the composites were greatly higher thanthat on the UiO-66 sample. The composite UiO-66/GO-5 exhibited the maximum CO2 uptake of3.37 mmol/g at 298 K and 1 bar, which increased by 48% in comparison with that of the UiO-66, and wasmuch higher than those of the conventional activated carbons and the zeolites. The CO2 adsorptioncapacity was dependent on the BET surface area and the micropore volume of the composites. Finally, theadsorption/desorption cycle experiment revealed that the adsorption performance of UiO-66/GO-5 wasfairly stable, without noticeable degradation in the adsorption capacity of CO2 after 6 cycles. Therefore,this kind of composites has a potential application on CO2 capture technologies to mitigate globalwarming.
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