Pretreatment of lignocellulosic waste as a precursor for synthesis of high porous activated carbon and its application for Pb (II) and Cr (VI) adsorption from aqueous solutions

Kharrazi, S. M.Department of Natural Resources, Isfahan University of Technology, Isfahan 84156-83111, Iran (author)

Effects of Elm tree sawdust pretreatments using alkali and alkaline earth metals (NaCl, KCl, CaCl2, MgCl2 and Elm tree ash) and deashing solutions (water, HCl, HNO3 and aqua regia) before the carbonization process on the porosity of produced activated carbons and Pb (II) and Cr (VI) adsorption were studied. The activated carbons were characterized by pore size distribution, surface area, FTIR, and SEM-EDX analysies. Based on the results, HCl leaching pretreatment of the biomass increased the activated carbon adsorption capacity of Cr (VI) from 114 to 190 mg g−1. The treatment of biomass with alkali and alkali earth metal salts, especially MgCl2, remarkably increased the activated carbon adsorption capacity of Pb (II) from 233 to 1430 mg g−1. The results indicated that Pb (II) adsorption was attributed to both the mesoporous structure of activated carbon and the abundance of Mg on the activated carbon's surface. On the other hand, the micropores played a major role in Cr (VI) adsorption capacity. The development of the micro- or mesoporous structure of activated carbons through pretreatment of lignocellulosic precursor could be an approach for providing high performance activated carbons for Pb (II) and Cr (VI) removal from aqueous solutions.

Soleimani, M.Department of Natural Resources, Isfahan University of Technology, Isfahan 84156-83111, Iran (author)
Jokar, M.Department of Natural Resources, Isfahan University of Technology, Isfahan 84156-83111, Iran (author)
Richards, Tobias,1972-Högskolan i Borås,Akademin för textil, teknik och ekonomi,Department of Resource Recovery and Building Technology(Swepub:hb)TORI (author)
Pettersson, AnitaHögskolan i Borås,Akademin för textil, teknik och ekonomi,Department of Resource Recovery and Building Technology(Swepub:hb)APE (author)
Mirghaffari, N.Department of Natural Resources, Isfahan University of Technology, Isfahan 84156-83111, Iran (author)
Department of Natural Resources, Isfahan University of Technology, Isfahan 84156-83111, IranAkademin för textil, teknik och ekonomi (creator_code:org_t)

In:International Journal of Biological Macromolecules: Elsevier180, s. 299-3100141-81301879-0003

By the author/editor: Kharrazi, S. M.; Soleimani, M.; Jokar, M.; Richards, Tobias ...; Pettersson, Anit ...; Mirghaffari, N.

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Environmental Sc ...

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