Abstract
-Type zirconium phosphate,-Zr(HPO4)2-.1.77H2O (-ZrP), crystalline cerium phosphate, Ce(HPO4)2.1.33 H2O (CePc), and [-Zr(HPO4)2]0.30 [Ce (HPO4)2]0.70 .2H2O composite were prepared and characterized by chemical, XRD, TGA, FT-IR and scanning electron microscopy(SEM). [-Zr(HPO4)2]0.30[Ce(HPO4)2]0.70/polyaniline, polyindole, polycarbazole, polyaniline-co-polyindole, polyaniline-co-polycarbazole composites were prepared via in-situ chemical oxidation of the monomers aniline, indole , carbazole, and (1:1moler ratio) of co-monomers aniline-indole, aniline- carbazole, respectively, that was promoted by the reduction of part of Ce(IV) ions present in the inorganic matrix. A possible explanation is part of CePc is attacked by the monomers, and the co-monomers, respectively, converted to cerium (III) orthophosphate (CePO4). The resultant novel composites were characterized by elemental (C,H,N) analysis, FT-IR, and (SEM). From elemental (C,H,N) analysis ,the amount of organic materials present in [-Zr(HPO4)2]0.30 [Ce (HPO4)2]0.70/ polyaniline, polyindole, polycarbazole composites were (23.44, 5.24 and 33.02 % in wt. ), respectively. The amount of resultant copolymers were (Pani 5.92, PIn 7.48 % in wt) and (Pani 1.42, PCz 2.48 % in wt ) These composites can be considered as novel conducting inorganic-organic composites, ion exchangers , solid acid catalysts and sensors.
Highlights
Tetravalent metal phosphates are very insoluble compounds with good thermal stabilities and high ion exchange capacities [1, 2]
Θ-Type zirconium phosphate, Θ-Zr(HPO4)2-.1.77H2O (Θ-ZrP), crystalline cerium phosphate, Ce(HPO4)2.1.33 H2O (CePc), and [Θ-Zr(HPO4)2]0.30 [Ce (HPO4)2]0.70 .2H2O composite were prepared and characterized by chemical, XRD, TGA, FT-IR and scanning electron microscopy(SEM). [Ɵ-Zr(HPO4)2]0.30[Ce(HPO4)2]0.70/polyaniline, polyindole, polycarbazole, polyaniline-co-polyindole, polyaniline-co-polycarbazole composites were prepared via in-situ chemical oxidation of the monomers aniline, indole, carbazole and (1:1moler ratio) of co-monomers aniline-indole, anilinecarbazole, respectively, that was promoted by the reduction of part of Ce(IV) ions present in the inorganic matrix
In previous studies we have found that when nanofibrous cerium phosphate membrane, Ce(HPO4)2.2.9H2O, reacts with aniline the resultant product was polyaniline nanocomposite membrane, of black color, non-conductance [67]
Summary
Tetravalent metal phosphates are very insoluble compounds with good thermal stabilities and high ion exchange capacities [1, 2]. Conducting polymers containing nitrogen atoms such as polyaniline, polypyrrole, and polyindole and their substituted derivatives, belonging to the fused-ring family, have received increasing attention in various fields due to their unique physical, electrical and chemical properties [23, 25,26,27, 31,32,33,34, 36] These materials have an important influence on electrochromic device, sensors, catalysis, anticorrosion. Polyaniline and their copolymers polypyrrole, polyindole have been reported recently [65, 66]
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