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Ingeniería y competitividad

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Abstract

TEJADA, Candelaria; HERRERA, Adriana  and  RUIZ, Erika. Kinetic and isotherms of biosorption of Hg(II) using citric acid treated residual materials. Ing. compet. [online]. 2016, vol.18, n.1, pp.117-127. ISSN 0123-3033.

In this paper was studied the adsorption of Hg(II) by using lignocellulosic residual biomass from bagasse palm and yam peels, which were chemically treated with citric acid. The concentrations of Hg(II) ions in the supernatant were analyzed by the formation of the Hg(CNS)4- 2 complex, which was measured through the absorption in the ultraviolet region (281nm). It was determined that the hydroxyl and carboxyl groups present in the chemically modified biomaterials have a huge contribution in the adsorption process. We estimated a maximum capacity of adsorption about 385,80 and 356,86mg/g for citric acid treated yam peels and bagasse palm, respectively. It was also determined that the Elovich kinetic model and the Freundlich isotherm model were the best to describe the adsorption process of Hg(II) onto both biomaterials

Keywords : Bioadsorption; citric acid; mercury; lignocelullosic residues.

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