▎ 摘　　要

The synthesis of a mesoporous gamma-Al2O3 nanorod/reduced graphene oxide (gamma-Al2O3NR/RGO) composite with a higher surface area and thermal conductivity than unmodified gamma-Al2O3 has been accomplished, and these materials were characterized in detail. The composite was used successfully as a support for poly(ethylenimine) (PEI) to capture CO2 at high temperature. The PEI-modified composite (gamma-Al2O3NR/ RGO/PEI) showed an excellent CO2 adsorption from simulated flue gas at 75 degrees C and complete desorption at 100 degrees C with recyclability. The maximum CO2 adsorption capacity of this material was 200.6 mgg(PEI)(-1) (1.14 mmol CO(2)g(adsorbent)(-1)) with an amine efficiency of 0.22, which is higher than that of bare gamma-Al2O3/PEI. As a result of its high thermal conductivity, the overheating of the adsorbent during exothermic CO2 adsorption by PEI was restricted and as a result the thermal degradation of PEI was prevented. Accordingly, the adsorption capacity of gamma-Al2O3NR/RGO/PEI does not deteriorate like that of bare gamma-Al2O3/PEI during repeated CO2 adsorption- desorption cycles.