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Isoconversional kinetic, mechanism and thermodynamic studies of the thermal decomposition of NH4Co0.8Zn0.1Mn0.1PO4·H2O

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Abstract

The single-phase NH4Co0.8Zn0.1Mn0.1PO4·H2O was successfully synthesized by precipitating method. The characterizations were carried out using TG/DTG/DTA, FTIR, AAS, XRD and SEM methods. Two decomposition steps correspond to the co-elimination and polycondensation, respectively. The final product is Co1.6Zn0.2Mn0.2P2O7. The XRD and AAS results confirmed the substitution of Zn2+ and Mn2+ into the Co2+ positions. The iterative isoconversional method of KAS was used to calculate the exact E α values. Both steps were confirmed to be single-step kinetic processes with the unique kinetic triplets: E α , A, f(α) or g(α). The most probable reaction mechanisms of the first and final steps were found to be F4 and F2, which belong to the reaction mechanism of chemical reaction for both steps, respectively. The pre-exponential factor A was calculated to be 1.89 × 1014 and 1.01 × 1012 s−1 for the first and final steps, respectively. The ΔH ≠, ΔS ≠ and ΔG ≠ of the transition state complexes were evaluated from the kinetic parameters. The kinetic triplets and the reaction mechanisms are reported for the first time.

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Acknowledgements

The authors would like to thank the Materials Chemistry Research Center, Department of Chemistry, Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Khon Kaen University, Khon Kaen 40002 Thailand. The support from National Research University Project through Advanced Functional Material Research Cluster, Office of the Higher Education, is highly acknowledged.

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Authors and Affiliations

  1. Materials Chemistry Research Center, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Advanced Functional Material Research Cluster, Khon Kaen University, Khon Kaen, 40002, Thailand

    Chuchai Sronsri & Chanaiporn Danvirutai

  2. Department of Chemistry, Faculty of Science, Materials Chemistry Research Center, Khon Kaen University, Khon Kaen, 40002, Thailand

    Pittayagorn Noisong

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Sronsri, C., Noisong, P. & Danvirutai, C. Isoconversional kinetic, mechanism and thermodynamic studies of the thermal decomposition of NH4Co0.8Zn0.1Mn0.1PO4·H2O. J Therm Anal Calorim 120, 1689–1701 (2015). https://doi.org/10.1007/s10973-015-4471-x

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