Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 439, Issue -, Pages 193-199Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2013.04.005
Keywords
Clay; Polypyrrole; Silver; Photopolymerization; Hybrid materials; Exfoliation; Catalysis
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Funding
- Indo-French Centre for the Promotion of Advanced Research (IFCPAR) through the Flexi-Sensors [4705-2]
- DAE-SRC Outstanding Research Investigator Award [2008/21/05-BRNS]
- Prospective Research Funds [2008/38/02-BRNS]
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Clay-polypyrrole-silver hybrid material was synthesized via one pot photopolymerization of pyrrole using silver nitrate as a photosensitizer in the presence of clay (montmorillonite, MMT). We have silanized the clay using a pyrrolyl-functionalized silane to provide anchor sites for the polypyrrole/silver composite coating (PPyAg). The silanized clay was effective in the making of a ternary hybrid material (MMT-Sil-PPyAg) which exhibits a PPyAg-rich surface. The polypyrrole and silver mass loadings were estimated to 19 and 27 wt.%, respectively. Interestingly, silanization by pyrrole functionalized silane permits to fully exfoliate the clay upon the photopolymerization process. In contrast, without silanization, the surface of the ternary hybrid material MMT-PPyAg is rather aluminosilicate-rich despite a black colour of the final product. We demonstrate that the anchored Ag particles are in the metallic state. We evaluated the propensity of the PPyAg-modified silanized clay to catalyse the reduction of methylene blue by NaBH4 and found it levels off to 94% within a few minutes only. This work conclusively demonstrate that UV-induced polymerization of pyrrole in the presence of a layered silicate is simple and fast; in addition, it permits to design novel hybrid materials with high catalytic performances (C) 2013 Elsevier B.V. All rights reserved.
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