Resumo

COLPAS CASTILLO, Fredy; TARON DUNOYER, Arnulfo  e  VASQUEZ, Yelitza. ADSORPTION CAPACITY OF LEAD WITH CATIONICS EXCHANGERS OF XANTED COAL. rev.udcaactual.divulg.cient. [online]. 2017, vol.20, n.2, pp.425-433. ISSN 0123-4226.

This study describes the adsorption of lead (Pb²⁺) in aqueous solutions of modified coal by treatment with CS₂ and NaOH, using a ratio of 16,6:1 NaOH/coal (w/w) and 4,08 CS₂/coal (w/w). Different tests such as acidity, kinetic and adsorption isotherms were carried out in order to assess the adsorption capacity of xanted and non-xanted coal. The sulfur groups presented in the xanted coal were identified by infrared spectroscopy(FTIR) and they were compared with non-xanted coal spectrum. The results show that the best lead removal in the solution (with a concentration of 100mg Pb²⁺/L and 50mg of adsorbent) was obtained at pH 5.0 for both coal (xanted and non-xanted) with an adsorption percentage of 98%. The kinetic studies indicate that the adsorption process can reach the equilibrium in about 120 minutes, following a pseudo-second order kinetics for both materials. The isotherms study indicates that the coal fits best to a Langmuir-type isotherm, however when the coal is xanted, it fits best to a Freundlich-type isotherm.

Palavras-chave : Coal; Langmuir isotherm; xanthates; industrial effluents.

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