Abstract

SANHUEZA NUNEZ, Vilma Mayerling  and  BENNUN TORRES, Leonardo Daniel. Synthesis of zeolitic materials from volcanic ash in presence and absence of cetyltrimethylammonium bromide. Rev. Int. Contam. Ambient [online]. 2015, vol.31, n.2, pp.185-193. ISSN 0188-4999.

Zeolitic materials as Na-phillipsite, Na-K-phillipsite-like zeolites and the mixtures of zeolites (phillipsite+analcime and phillipsite+chabazite+analcime) were synthesized from volcanic ash, either in presence and absence of cetiltrimetilamonium bromide (CTAB). The ash sample used in the laboratory experiments contains 75.36 % SiO₂ and 14.11 % Al₂O₃, abundances. The reaction time as well as the influence of CTAB were studied in the zeolitic materials crystallization. The experiments were carried out under hydrothermal conditions, autogenic pressure and temperature of 150 °C, as well as reaction time from 8 to 116 h. Products from this hydrotermal treatment were identified by X-ray diffraction (XRD) and characterized by scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS). Of the zeolitic materials obtained the Na-K-phillipsite-like zeolite was found to be the most effective for the retention of cations Pb²+, Zn²+, and Ba²+.

Keywords : zeolites; phillipsite; chabazite; analcime; ash; synthesis.

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