The role of surface functionality on silica and carbonaceous materials for adsorption of cadmium(II)
was examined using various mesoporous silica and activated carbon. Silica surfaces were principally
functionalized by mono-amino- and mercapto-groups, while carboxylic group was introduced to the
activated carbons by oxidation. Functional groups on silica surface were formed using grafting and cocondensation
techniques in their preparation. Mono-amino group was found more effective than diand
tri-amino groups for cadmium(II) adsorption on the grafted silica. Mono-amino groups prepared by
co-condensation adsorbed cadmium(II) as much as 0.25 mmol/g compared to mercapto- and carboxylgroups
which adsorbed around 0.12 mmol/g, whereas Langmuir adsorption affinities were as strong
as 50–60 L/mmol for all of the three functions. The working pH range was wider for mercapto- and
carboxyl-functions than for amino-group. Basic site could be an adsorption center for amino-functional
groups while ion exchange sites were found to work for the mercapto- and carboxyl-functions to adsorb
cadmium(II) from aqueous phase. Based on the experimental results, surface functional groups rather
than structure of silica and carbon seemed to play a decisive role for cadmium(II) adsorption.