Study of the cation exchange capacity of zeolities and its relation with spectrum parameters of ions exchanged

L. MENTASTY; G. TIRAO; M TORRES DELUIGI; I. DE VITO; J.A. RIVEROS

Rio de Janeiro

Congreso; XI Seminario Latinoamericano de Análisis por Técnicas de Rayos X; 2008

Zeolites are minerals highly crystalline of the hydrated aluminosilicates family, they have common structural characteristics with channels and cavities of molecular dimensions where the compensation cations (Na+, K+, Ca2+, Sr2+, Ba2+, Mg2+,...), water molecules, or others adsorbates and salts are situated. The physicochemical and microporous properties provide unique aspects for a great diversity of applications. The cation exchange capacity (CEC) is an essential characteristic of zeolites that allow them to modify and to fit considerably their properties for sundry uses [1].   This work studies the CEC of 5A and 13X synthetic zeolites for remove heavy metal ions such as Cr3+ y el Cu2+, by means of high resolution absorption and emission Kspectra which were oobtained with synchrotron radiation monochromatic excitation [2-5]. The absorption spectra were generated by fluorescent way from valence band of Cr and Cu exchanged in both types of zeolites. The relation between the CEC of these zeolites with the spectrum parameters of Cr and Cu (energetic positions, natural wides and integrated intensities) were determinated. It was also achieved to characterize chemical and physically the ionic exchange with Cr3+ y el Cu2+ carried out in these synthetic zeolites. This results give relevant information that can be applied in diverse areas, particularly in Cr(VI) retention. This pollutant of high-toxicity for biological systems (especially for humans) uses it in galvanized, tannery and textile industries.