SYNTHESIS OF A NANOSTRUCTURED COMPOSITE POLYANILINE/Na-AlSBA-3 MATERIAL

OSCAR A. ANUNZIATA; M. LAURA MARTINEZ; MARCOS B. GÓMEZ COSTA

Canún, México

Congreso; XVIII International Materials Research Congress. New Catalytic Materials; 2009

IMRC

The new aluminosilicate catalytic material, Na-AlSBA-3 was synthesized, with the aim to apply in the preparation of nano-composites. The novel Na-AlSBA-3 mesoporous material (we have not find information reported in bibliographies about this material) was obtained implying a sol-gel method. After template extraction and calcinations, the solid Na-AlSBA-3 was obtained. The presence of Na+ cations in the structure of Na-AlSBA-3 is a prerequisite for aniline adsorption and aniline in situ polymerization. The developed technique was effective for the synthesis; the sharpness of XRD signals and hkl index indicates the regularity of the hexagonal array of cylindrical pores in the Na-AlSBA-3. The material was exposed to equilibrium vapours from liquid aniline to obtain aniline saturated host [1]. The FTIR analysis of adsorbed aniline on Na-AlSBA-3 shows the characteristic bands ascribed to N-H2 bending, two C-C ring stretching at 1625, 1604 and 1498 cm-1 respectively. Mainly aniline molecules would be bound through weak ¦Ð interactions onto the structure of the material such us Na+ cations and SiOH groups (electron acceptors sites of the material). Mesoporous polyaniline/Na-AlSBA-3 (PANI//Na-AlSBA-3) composite was prepared and their physical properties were investigated. The polyaniline (PANI) was polymerized inside the pores of the mesoporous material by an oxidative polymerization process (in-situ polymerization technique). Composite (PANI/Na-AlSBA-3), has been characterized by infrared spectroscopy. The characteristic FTIR PANI bands [1] are present in that spectrum ascribed to quinoid stretching (N=Q=N) and C-C ring stretching. XRD analysis showed that there are PANI chains confined into the host channels. Compared with pure Na-AlSBA-3 a remarkable reduction in the peak intensities is observed with the filling of pores with PANI. This can be attributed to the formation of PANI chains in the channels [2]. The composite XRD pattern, no showed PANI characteristic peaks because the PANI should be inside the pores of the material. [1] O.Anunziata, M.Gómez Costa, L.Martínez, Catalysis Today 133-135 (2008) 897-905. [2] Q. Cheng, V. Pavlinek, A. Lengalova, C. Li, Y. He, P. Saha, Microporous and Mesoporous Materials 93 (2006) 263-269.