Study on the preparation of activated carbon from coffee husk toward the adsorption of dye in aqueous solution
Abstract
Activated carbon with high specific surface area containing large amount of mesopore was prepared from coffee husk by means of ZnCl2 activation. Physical and chemical investigation showed that the as-prepared activated carbon consists of uniform spherical shaped particles, specific surface area 1410 m2 g-1, total pore volume 0.9206 cm3 g-1 (which contain 41.43% mesopore), and contain numerous acidic and basic functional groups. Adsorption isotherm of Methylene Blue (MB) and Direct Scarlet 4BS (DS-4BS) obeyed Toth isothermal model. Monolayer adsorption capacities of activated carbon were 208.48 mg g-1 for MB and 350.67 mg g-1 for DS-4BS, respectively.
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