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Author: search.filters.author.Chaiseeda, KittichaiSubject: search.filters.subject.Kinetics

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    Simple synthesis, kinetics and thermodynamics of rod-like Cu2(OH)PO4 microparticles and rod-like Cu4O(PO4)2 nanoparticles
    (2020-08-01)
    Kullyakool, Saifon
    ;
    Boonchom, Banjong
    ;
    Chaiseeda, Kittichai
    Rod-like Cu<inf>2</inf>(OH)PO<inf>4</inf> microparticles were synthesized via a simple wet chemical reaction by mixing the solutions of CuSO<inf>4</inf>·5H<inf>2</inf>O and Na<inf>3</inf>PO<inf>4</inf>·12H<inf>2</inf>O at 90 °C for 24 h. Thermal transformation of the prepared Cu<inf>2</inf>(OH)PO<inf>4</inf> microparticles were related to endothermic dehydroxylation and its final decomposed product rod-like Cu<inf>4</inf>O(PO<inf>4</inf>)<inf>2</inf> nanoparticles were obtained. The XRD results indicated that Cu<inf>2</inf>(OH)PO<inf>4</inf> and Cu<inf>4</inf>O(PO<inf>4</inf>)<inf>2</inf> crystallize orthorhombic (space group Pnnm, D<inf>2h</inf> <sup>12</sup>) and triclinic (space group P1‾, C<inf>i</inf> <sup>1</sup>) phases, respectively. The thermal transformation mechanisms from Cu<inf>2</inf>(OH)PO<inf>4</inf> to Cu<inf>4</inf>O(PO<inf>4</inf>)<inf>2</inf> were expressed thought the relation of the graphical shape of isothermal combined with the non-isothermal multi-heating rate equation and kinetic models (P<inf>3/2</inf> and R<inf>2</inf>) to discuss the change of morphologies from microparticles to nanoparticles. Kinetic parameters and triplet thermodynamic functions of activated compound were determined and fully discussed. The obtained data will be useful for academic scientists and industrial researchers to apply these copper phosphates for special applications.