adsorbed. Adsorption capacity of coconut shell activated carbon
impregnated with strong base was reported to be lower at low H2S
concentration with surface area of 91.1 m2/g compared to higher
H2S concentration with surface area of 215.4 m2/g [47]. The
amount of H2S adsorbed at both concentrations showed a clear
dependence on the amount of basic groups present on the surface.
The presence of strong base on the carbon surface increased H2S
adsorption capacity even at dry conditions. In this study, sulfur
compounds adsorbed on the carbon surface were identified as
elemental sulfur, sulfur oxides, carbon sulfide, polysulfides and
hydrogen sulfide [47].