Abstract

SANABRIA, Nancy R; MOLINA, Rafael A  and  MORENO, Sonia. EFFECTS OF ULTRASOUND IN THE SYNTHESIS OF ALUMINUM PILLARED CLAY IN CONCENTRATED MEDIA. Rev.Colomb.Quim. [online]. 2008, vol.37, n.3, pp.325-335. ISSN 0120-2804.

The synthesis of pillared bentonite with aluminum in concentrated media, using ultrasound at the intercalation step was done. The pillaring agent was prepared by hydrolysis of AlCl3 with NaOH, followed by precipitation with a Na2SO4 disolution and redisolution with a Ba(NO3)2. The pillaring agent was characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM) and nuclear magnetic resonance for aluminum (27Al-NMR). The pillared clay was characterized by XRF, XRD and N2 adsorption to 77 K. The pillared bentonite with aluminum in concentrated media using ultrasound at the intercalation step, presents structural and textural properties comparable to the sample modified by the conventional method: diluted suspensions and high intercalation time. Additionally, the use of clay-pillaring agent in concentrated suspensions and ultrasound at the intercalation step allows a 90-95% decrease in the volume of water and a reduction in the intercalation times between 70-93% with respect to the conventional synthesis.

Keywords : pillared clays; Al-PILC; ultrasound; concentrated media.

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