Cadmium(II) adsorption using functional mesoporous silica and activated carbon

Journal of Hazardous Materials
Motoi MachidaLouis Mercier

Abstract

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 co-condensation techniques in their preparation. Mono-amino group was found more effective than di- and tri-amino groups for cadmium(II) adsorption on the grafted silica. Mono-amino groups prepared by co-condensation adsorbed cadmium(II) as much as 0.25mmol/g compared to mercapto- and carboxyl-groups which adsorbed around 0.12mmol/g, whereas Langmuir adsorption affinities were as strong as 50-60L/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 decisiv...Continue Reading

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Citations

Jul 31, 2013·Journal of Hazardous Materials·Fa-Kuen ShiehHsien-Ming Kao
Jun 4, 2015·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Jun LiuZhanhong Liu
Apr 27, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Lei XuJing Zhou
Apr 13, 2017·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Acong ChenZhaoyong Bian
Jun 18, 2019·Water Environment Research : a Research Publication of the Water Environment Federation·Zahra Shariatinia, Alireza Esmaeilzadeh

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