Graphene oxide-doped stearate-intercalated layered double oxide nanocomposites as high-performance CO2 adsorbents

The nanocomposites of graphene oxide (GO)-doped stearate-intercalated layered double oxides (LDO) as a new type of CO 2 adsorbents at medium temperatures (200–400 °C) are reported for the first time. The doping of GO could improve stability of the composite material. The CO 2 adsorption uptake (0.52 mmol/g) of LDO-Stearate (LDO-SA) was significantly increased by intercalating the long carbon chain organic anion of stearate. The 6 wt% GO − LDO-SA (6GO − LDO-SA) nanocomposite possessed the largest CO 2 adsorption uptake (0.83 mmol/g), which was much larger than that (0.35 mmol/g) of the conventional LDO adsorbent. Such a high performance of 6GO − LDO-SA was associated with its increase in surface area and basic site amount. The adsorption process of CO 2 on the nanocomposite was dominated by the chemical adsorption, and the adsorbed CO 2 was mainly stored in the form of carbonate. The regeneration efficiency of 6GO − LDO-SA was>88% after 10 adsorption and desorption recycling tests, which was much higher than that of LDO. Simultaneously, the 6GO − LDO-SA adsorbent exhibited a fast kinetics (0.863 mmol/(g·min)) under the medium-temperature conditions. We are sure that the new nanocomposite materials fabricated in the present study are promising in the applications of carbon dioxide capture.