Resumo

CORDOVA-RODRIGUEZ, Valduvina et al. Comprehensive study on chromate ions removal at different basicity whit zeolite of natural mordenite type. Rev Cub Quim [online]. 2020, vol.32, n.3, pp. 494-510.  Epub 12-Mar-2020. ISSN 2224-5421.

This work presents a comprehensive study on chromate ions (CrO4 2-) removal from aqueous solutions for different levels of alkalinity in the natural mordenite zeolite from Palmarito de Cauto deposit. The Surface charge density and zero charge point (p.z.c.) values of the zeolite were determined, which lead to outline that these ions are adsorbed on this mineral in a specifically form and it was associated with the formation of an electric layer double. Through atomic emission spectroscopy, infrared spectroscopy (FT-IR) and scanning electron microscopy (MEB) with EDX was showed that this zeolite removes chromium from the aqueous solutions of chromate ions and it occurs independently of its basicity level. The mineral has a significant neutralizing effect on alkaline solutions. The results provide information that expands the useful potential of an abundant natural resource, with low cost and great accessibility.

Palavras-chave : natural zeolite; mordenite; chromate; neutralization; specific adsorption.

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