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Kinetice and thermodynamics of zine phosphate hydrate synthesized by a simple rout in aqueous and acetone media / Banjong Boonchom in Industrial & engineering chemistry research, Vol. 49 N° 8 (Avril 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp. 3571–3576 Titre : Kinetice and thermodynamics of zine phosphate hydrate synthesized by a simple rout in aqueous and acetone media Type de document : texte imprimé Auteurs : Banjong Boonchom, Auteur ; Rattanai Baitahe, Auteur ; Samart Kongtaweelert, Auteur Année de publication : 2010 Article en page(s) : pp. 3571–3576 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Thermodynamics  Zinc  Phosphate  Hydrate  Acetone Résumé : Zinc phosphate (Zn3(PO4)2·4H2O) was prepared by a simple route using ZnO and H3PO4 in aqueous and acetone media at ambient temperature. Zn3(PO4)2·4H2O decomposes to Zn3(PO4)2 by three dehydration reactions, as revealed by thermal analytical (TG/DTG/DTA) and differential scanning calorimetry (DSC) techniques. The synthesized Zn3(PO4)2·4H2O and its dehydration product Zn3(PO4)2 were characterized by powder X-ray diffraction, Fourier transfer infrared, and scanning electron microscopy. Kinetic triplet parameters (activation energy, E; preexponential, A; Avrami exponent, n) and thermodynamic functions (ΔH*, ΔG*, and ΔS*) of three dehydration reactions are calculated by DSC experiments. Evaluation and control of the specific characteristics of three dehydration processes of Zn3(PO4)2·4H2O are essentially important in the variously oriented studies, which were discussed from the viewpoints of thermal stability based on kinetics and thermodynamics. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901626z [article] Kinetice and thermodynamics of zine phosphate hydrate synthesized by a simple rout in aqueous and acetone media [texte imprimé] / Banjong Boonchom, Auteur ; Rattanai Baitahe, Auteur ; Samart Kongtaweelert, Auteur . - 2010 . - pp. 3571–3576. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp. 3571–3576 Mots-clés : Thermodynamics  Zinc  Phosphate  Hydrate  Acetone Résumé : Zinc phosphate (Zn3(PO4)2·4H2O) was prepared by a simple route using ZnO and H3PO4 in aqueous and acetone media at ambient temperature. Zn3(PO4)2·4H2O decomposes to Zn3(PO4)2 by three dehydration reactions, as revealed by thermal analytical (TG/DTG/DTA) and differential scanning calorimetry (DSC) techniques. The synthesized Zn3(PO4)2·4H2O and its dehydration product Zn3(PO4)2 were characterized by powder X-ray diffraction, Fourier transfer infrared, and scanning electron microscopy. Kinetic triplet parameters (activation energy, E; preexponential, A; Avrami exponent, n) and thermodynamic functions (ΔH*, ΔG*, and ΔS*) of three dehydration reactions are calculated by DSC experiments. Evaluation and control of the specific characteristics of three dehydration processes of Zn3(PO4)2·4H2O are essentially important in the variously oriented studies, which were discussed from the viewpoints of thermal stability based on kinetics and thermodynamics. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901626z

Simple synthesis, magnetic properties, and nonisothermal decomposition kinetics of Fe(H2PO4)2·2H2O / Banjong Boonchom in Industrial & engineering chemistry research, Vol. 47 N°20 (Octobre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°20 (Octobre 2008) . - P. 7642-7647 Titre : Simple synthesis, magnetic properties, and nonisothermal decomposition kinetics of Fe(H2PO4)2·2H2O Type de document : texte imprimé Auteurs : Banjong Boonchom, Editeur scientifique ; Chanaiporn Danvirutai, Editeur scientifique ; Sujittra Youngme, Editeur scientifique Année de publication : 2008 Article en page(s) : P. 7642-7647 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Iron  metal  Phosphoric  acid  Magnetic  Properties  Fe(H2PO4)2·2H2O Résumé : Fe(H2PO4)2·2H2O was synthesized by a simple and cost-effective method using iron metal and phosphoric acid as starting chemicals. The thermal transformation products from the synthesized Fe(H2PO4)2·2H2O according to the thermal treatment at 423 and 673 K were found to be FeH2P2O7 and Fe2P4O12, respectively. The activation energies of decomposition reaction of Fe(H2PO4)2·2H2O were calculated through the isoconversional methods of Ozawa and Kissinger−Akahira−Sunose. The synthesized Fe(H2PO4)2·2H2O and its thermal transformation products were characterized by scanning electron microscopy, X-ray powder diffraction, and FTIR spectroscopy. Room-temperature magnetization results showed a ferromagnetic behavior of the Fe(H2PO4)2·2H2O and its thermal transformation products. The hysteresis loops were in the range −10000 Oe < H < +10000 Oe, and the strong specific magnetization values were in the range 32.25−96.28 emu/g at 10 kOe. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800007j [article] Simple synthesis, magnetic properties, and nonisothermal decomposition kinetics of Fe(H2PO4)2·2H2O [texte imprimé] / Banjong Boonchom, Editeur scientifique ; Chanaiporn Danvirutai, Editeur scientifique ; Sujittra Youngme, Editeur scientifique . - 2008 . - P. 7642-7647. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°20 (Octobre 2008) . - P. 7642-7647 Mots-clés : Iron  metal  Phosphoric  acid  Magnetic  Properties  Fe(H2PO4)2·2H2O Résumé : Fe(H2PO4)2·2H2O was synthesized by a simple and cost-effective method using iron metal and phosphoric acid as starting chemicals. The thermal transformation products from the synthesized Fe(H2PO4)2·2H2O according to the thermal treatment at 423 and 673 K were found to be FeH2P2O7 and Fe2P4O12, respectively. The activation energies of decomposition reaction of Fe(H2PO4)2·2H2O were calculated through the isoconversional methods of Ozawa and Kissinger−Akahira−Sunose. The synthesized Fe(H2PO4)2·2H2O and its thermal transformation products were characterized by scanning electron microscopy, X-ray powder diffraction, and FTIR spectroscopy. Room-temperature magnetization results showed a ferromagnetic behavior of the Fe(H2PO4)2·2H2O and its thermal transformation products. The hysteresis loops were in the range −10000 Oe < H < +10000 Oe, and the strong specific magnetization values were in the range 32.25−96.28 emu/g at 10 kOe. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800007j