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Rapid coprecipitation and non-isothermal decomposition kinetics of new binary Mn0.5CU0.5(H2PO4) 2·1.5H2O
Author(s)
Danvirutai, Chanaiporn
Date Issued
May 7, 2008
Type
Article
Abstract
New binary metal dihydrogen phosphate dihydrate Mn0.5Cu 0.5(H2PO4)2·1.5H 2O was synthesized by a rapid and simple coprecipitation method using phosphoric acid, manganese metal, and copper oxide at ambient temperature. The thermal stability of Mn0.5Cu0.5(H2PO 4)2·1.5H2O was studied by means of the non-isothermal kinetics (Kissinger method). The synthesized Mn 0.5Cu0.5(H2PO4)2· 1.5H2O shows complex thermal transformations, and its final decomposition product was a binary metal cyclotetraphosphate, MnCuP 4O12. The X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-vis-near-IR, and Fourier transform IR (FTIR) results of the synthesized Mn0.5Cu0.5(H2PO4) 2·1.5H2O and the decomposed MnCuP4O 12 appear to be very similar to those of M(H2PO 4)2·2H2O and M2P 4O12 (M = Mn and Cu), which indicate the monoclinic phase with space group P21/n and C2/c, respectively. The dominant features of the synthesized Mn0.5Cu0.5(H2PO 4)2·1.5H2O and the decomposition product MnCuP4O12 are compared with those of M(H 2PO4)2·2H2O and M 2P4O12 (M = Cu and Mn), respectively. © 2008 American Chemical Society.
Citation
Industrial and Engineering Chemistry Research, 47(9), 2941-2947, 2008