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October 19-20, 2017

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Perfecto Barragan-Pena

Instituto TecnolÃ³gico de Nogales, Mexico

Title: Kinetics of the cadmium uptake by a thiourea-modified natural clinoptilolite

Biography

Biography: Perfecto Barragan-Pena

Abstract

To treat aqueous solutions with Cd²+ concentrations up to 67.83 mg/L experiments were carried out in a batch system where a natural modified zeolite from guaymas, Sonora, Mexico, was used as the adsorbent. The zeolitic material was modified with NaCl and thiourea. The experimentation was conducted at a pH=5.0. The results were compared to a study where the initial concentration for the zeolite modified with thiourea was 37.3 mg/L. Kinetics showed that the zeolite modified with NaCl and thiourea is best described according to pseudo-second order model, R²=0.9997, with a k2=0.763 g/(mg h) and qe=6.238 mg/g reached at 5 h. Compared to the non-modified adsorbent the thiourea-modified clinoptilolite improved its capacity to take up cadmium significantly.