To reduce the carbon dioxide (CO 2 ) concentration in the atmosphere, natural rubber (NR) was developed as a rubber foam for CO 2 adsorption. Although the CO 2 adsorption capacity of the NR latex foam produced by mixing with a cake mixer (CM) was higher than that produced with an overhead stirrer (OS), both capacity values were still low. To improve the CO 2 adsorption capacity, the use of unmodified and (3-aminopropyl) triethoxysilane-modified silica particles as fillers in the CM rubber foam matrix was examined. The highest CO 2 adsorption capacity, from a mixed gas flow rate of 100 mL min À1 at ambient temperature and pressure, was obtained with the CM foam filled with 5 parts by weight per hundred parts of rubber filled with modified silica particles (4.08 mg g À1 ). The CO 2 adsorption capacity of this foam was approximately 1.11-and 2.87fold higher than that of the CM foam filled with unmodified silica particles (3.69 mg g À1 ) and unfilled CM rubber (1.42 mg g À1 ), respectively. Morphological analysis supported that the cell size and number of pores per cell of the NR latex foam, which were higher in the CM foams than the OS foams, were important factors for evaluating CO 2 adsorption. In addition to physisorption between CM and CO 2 , chemisorption between the modified silica particles and CO 2 increased the CO 2 adsorption capacity.

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