2017 Volume 71 Issue 1 Pages 101-108
This study was performed to evaluate the effects of C/S ratio and aluminum substitution ratio on hydrogen sulfide adsorption ability of the calcium-silicate-hydrates（C-S-H）and the calcium-aluminum-silicate-hydrates（C-A-S-H）and to clarify the hydrogen sulfide adsorption mechanism of C-S-H and C-A-S-H. As a result, the hydrogen sulfide adsorption ability was increased with decreasing the C/S ratio of C-S-H, and the ability was increased by using the aluminum substituted C-S-H with low C/S ratio. Moreover, the amount of water vapor adsorption and the BET specific surface area of C-S-H were increased with decreasing the C/S ratio. On the other hand, the amount of water vapor adsorption of the C-A-S-H was increased in a meso pore region（about 2-50nm）as compared to the C-S-H with same C/S ratio；however, the H2O-BET specific surface area of the C-A-S-H was little differentiated from the C-S-H with same C/S ratio. Therefore, it was suspected that the hydrogen sulfide adsorption ability was increased because of the increasing of the H2O-BET specific surface area of C-S-H caused by decreasing of C/S ratio, and because of the increasing of AlOCa＋ adsorption sites of C-A-S-H caused by aluminum substitution for silicate.
