Boonchom, Banjong
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Boonchom, Banjong
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BOONCHOM, Banjong
Boonchom, B.
Boonchom, And Banjong
Boonchoma, Banjong
Boomchom, Banjong
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banjong.bo@kmitl.ac.th
15 results
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Item type:Publication, Kinetics and thermodynamics of thermal decomposition of synthetic AlPO 4•2H2O(2009-12-01); Danvirutai, ChanaipornThe non-isothermal kinetics of dehydration of AlPO<inf>4</inf>•2H <inf>2</inf>O was studied in dynamic air atmosphere by TG-DTG-DTA at different heating rates. The result implies an important theoretical support for preparing AlPO<inf>4</inf>. The AlPO<inf>4</inf>•2H<inf>2</inf>O decomposes in two step reactions occurring in the range of 80-150 °C. The activation energy of the second dehydration reaction of AlPO<inf>4</inf>•2H<inf>2</inf>O as calculated by Kissinger method was found to be 69.68 kJ mol<sup>-1</sup>, while the Avrami exponent value was 1.49. The results confirmed the elimination of water of crystallization, which related with the crystal growth mechanism. The thermodynamic functions (ΔH*, ΔG*and ΔS*) of the dehydration reaction are calculated by the activated complex theory. These values in the dehydration step showed that it is directly related to the introduction of heat and is non-spontaneous process. © 2009 Akadémiai Kiadó, Budapest, Hungary. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A simple synthesis and room temperature magnetic properties of new binary Mn0.5Fe0.5(H2PO4)2·xH2O obtained from a rapid co-precipitation at ambient temperature(2009-02-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A simple synthesis and characterization of binary Co0.5Fe 0.5(H2PO4)2·2H2O and its final decomposition product CoFeP4O12(2011-01-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Thermodynamic and kinetic properties of the formation of Mn 2P2O7 by thermal decomposition of Mn(H 2PO2)2·H2O(2009-03-12) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Study of the dehydration of Co(H2PO4) 2-2H2O(2009-04-09); Danvirutai, ChanaipornThe thermal transformation of Co(H<inf>2</inf>PO<inf>4</inf>)<inf>2</inf> 2H<inf>2</inf>O was studied under a dry air atmosphere using TG-DTG-DTA. The TG-DTG-DTA curves show that the transformation occurs in three steps, which are dehydration processes. Co(H<inf>2</inf>PO<inf>4</inf>)<inf>2</inf> · 2H<inf>2</inf>O and its thermal transformation product were characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), Fourier transform infrared (FTIR), and UV-vis near-IR techniques. The nonisothermal kinetics of Co(H<inf>2</inf>PO<inf>4</inf>)<inf>2</inf> · 2H<inf>2</inf>O was studied by means of the Kissinger method. The specificity of the thermal transformation was characterized by identification of the bonds to be selectively activated because of energy absorption at the vibrational level, which are confirmed by the comparison of calculated wavenumbers and observed wavenumbers of the FTIR spectra. The activated complex theory has been applied to each step of the reactions, and the thermodynamic functions δH <sup>≠</sup>, δG<sup>≠</sup>, and δS<sup>≠</sup> are calculated. These values for three stages showed that they are connected with the introduction of heat and are nonspontaneous processes. © 2009 American Chemical Society. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Simple synthesis, magnetic properties, and nonisothermal decomposition kinetics of Fe(H2PO4)2 · 2H2O(2008-10-15); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Thermal decomposition kinetics of FePO4·3H2O precursor to synthetize spherical nanoparticles FePO4(2007-12-19); Danvirutai, ChanaipornThe thermal decomposition of iron phosphate trihydrate FePO <inf>4</inf>·3H<inf>2</inf>O was investigated in air using TG-DTG/DTA. The FePO<inf>4</inf>·3H<inf>2</inf>O decomposes in two steps, and the final decomposition product (FePO<inf>4</inf>) was studied by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared (FT-IR) spectroscopy. The activation energies of the second dehydration reaction of FePO<inf>4</inf>·3H<inf>2</inf>O were calculated through the isoconversional methods of Ozawa and Kissinger-Akahira-Sunose (KAS), and the possible conversion functions have been estimated through the Coats-Redfern method. The specificity of thermal decomposition was characterized by identification of the bonds to be selectively activated due to energy absorption at the vibrational level, which was assigned by comparing the calculated wavenumbers with the observed wavenumbers in FTIR spectra. The kinetic model that better describes the second reaction of dehydration for FePO <inf>4</inf>·3H<inf>2</inf>O is the F<inf>n</inf> model as a simple n-order reaction, and the corresponding function is xc4(α) = (1-α)<sup>2.50</sup> and g(α) = -[1-(1-α)<sup>-1.50</sup>/(1. 50)]. © 2007 American Chemical Society. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Rapid coprecipitation and non-isothermal decomposition kinetics of new binary Mn0.5CU0.5(H2PO4) 2·1.5H2O(2008-05-07); Danvirutai, ChanaipornNew binary metal dihydrogen phosphate dihydrate Mn<inf>0.5</inf>Cu <inf>0.5</inf>(H<inf>2</inf>PO<inf>4</inf>)<inf>2</inf>·1.5H <inf>2</inf>O was synthesized by a rapid and simple coprecipitation method using phosphoric acid, manganese metal, and copper oxide at ambient temperature. The thermal stability of Mn<inf>0.5</inf>Cu<inf>0.5</inf>(H<inf>2</inf>PO <inf>4</inf>)<inf>2</inf>·1.5H<inf>2</inf>O was studied by means of the non-isothermal kinetics (Kissinger method). The synthesized Mn <inf>0.5</inf>Cu<inf>0.5</inf>(H<inf>2</inf>PO<inf>4</inf>)<inf>2</inf>· 1.5H<inf>2</inf>O shows complex thermal transformations, and its final decomposition product was a binary metal cyclotetraphosphate, MnCuP <inf>4</inf>O<inf>12</inf>. The X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-vis-near-IR, and Fourier transform IR (FTIR) results of the synthesized Mn<inf>0.5</inf>Cu<inf>0.5</inf>(H<inf>2</inf>PO<inf>4</inf>) <inf>2</inf>·1.5H<inf>2</inf>O and the decomposed MnCuP<inf>4</inf>O <inf>12</inf> appear to be very similar to those of M(H<inf>2</inf>PO <inf>4</inf>)<inf>2</inf>·2H<inf>2</inf>O and M<inf>2</inf>P <inf>4</inf>O<inf>12</inf> (M = Mn and Cu), which indicate the monoclinic phase with space group P2<inf>1</inf>/n and C2/c, respectively. The dominant features of the synthesized Mn<inf>0.5</inf>Cu<inf>0.5</inf>(H<inf>2</inf>PO <inf>4</inf>)<inf>2</inf>·1.5H<inf>2</inf>O and the decomposition product MnCuP<inf>4</inf>O<inf>12</inf> are compared with those of M(H <inf>2</inf>PO<inf>4</inf>)<inf>2</inf>·2H<inf>2</inf>O and M <inf>2</inf>P<inf>4</inf>O<inf>12</inf> (M = Cu and Mn), respectively. © 2008 American Chemical Society. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A simple synthesis and thermal decomposition kinetics of MnHPO 4•H2O rod-like microparticles obtained by spontaneous precipitation route(2008-01-01); Danvirutai, ChanaipornManganese hydrogenphosphate monohydrate (MnHPO<inf>4</inf>•H <inf>2</inf>O) was prepared by a rapid precipitation (10 min) using Mn(c)-H <inf>3</inf>PO<inf>4</inf> system at ambient temperature. The thermal treatment of MnHPO<inf>4</inf>•H<inf>2</inf>O at 773 K found to be a manganese pyrophosphate (Mn<inf>2</inf>P<inf>2</inf>O<inf>7</inf>). The activation energies of the major mass loss step were calculated by Ozawa and Kissinger-Akahira-Sunose (KAS) isoconversional methods, which were used to determine the decomposition mechanism. The energy absorptions at the vibrational level of thermal decomposition steps were calculated and were compared with spectroscopic data, which were used to identify the molecules or ions that were released in each thermal transformation steps. The synthesized MnHPO <inf>4</inf>•H<inf>2</inf>O and its thermal decomposition product Mn <inf>2</inf>P<inf>2</inf>O<inf>7</inf> were investigated by scanning electron microscope (SEM), X-ray powder diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. The SEM micrographs show rod-like microparticles for the synthesized MnHPO<inf>4</inf>•H<inf>2</inf>O and porosity on surface of the decomposition product Mn<inf>2</inf>P<inf>2</inf>O<inf>7</inf>, which are important for specific applications. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Synthesis of MnNiP2O7 and nonisothermal decomposition kinetics of a new binary Mn0.5Ni0.5HPO4 · H2O precursor obtained from a rapid coprecipitation at ambient temperature(2008-08-20); Danvirutai, ChanaipornThe new binary metal hydrogen phosphate monohydrate Mn<inf>05</inf>Ni <inf>0.5</inf>HPO<inf>4</inf> · H<inf>2</inf>O was synthesized by a rapid and simple coprecipitation method using phosphoric acid, manganese metal, and nickel carbonate at ambient temperature. The kinetics of dehydration of Mn <inf>05</inf>Ni<inf>0.5</inf>HPO<inf>4</inf> · H<inf>2</inf>O was studied under nonisothermal heating by thermogravimetry (TG), and its final decomposition product was a binary metal pyrophosphate, MnNiP<inf>2</inf>O <inf>7</inf>. The activation energies of the dehydration step of Mn <inf>05</inf>Ni<inf>0.5</inf>HPO<inf>4</inf>·H<inf>2</inf>O were calculated through the isoconversional methods of Ozawa and Kissinger-Akahira- Sunose (KAS), and the possible conversion functions have been estimated through the Coats-Redfern method. The activation energies calculated for the dehydration of Mn<inf>05</inf>Ni<inf>0.5</inf>HPO<inf>4</inf> · H<inf>2</inf>O by different methods and techniques were found to be consistent. The possible conversion function of the dehydration reaction for Mn<inf>05</inf>Ni <inf>0.5</inf>HPO<inf>4</inf> · H<inf>2</inf>O was "spherical symmetry" of a "three-dimensional diffusion mechanism". © 2008 American Chemical Society.