The study focused on analysing the kinetics of halloysite decomposition using the differential thermal analysis (DTA) technique. Tests were carried out across a temperature span from ambient temperature to 1673 K, employing heating rates spanning from 5 to 20 °C.min−1. X-ray diffraction and Fourier transform infrared spectroscopy (FT-IR) were utilized to identify the phases formed at different temperatures. Activation energies for halloysite decomposition were determined through isothermal and non-isothermal treatments, yielding values of approximately 151.68 kJ mol−1 and 173.14 kJ mol−1, respectively. The Ligero method's Avrami constant parameter (m) and the Matusita method's numerical factor parameter ( n), linked to crystal growth dimensions, were both around 1.5. These findings indicate that the degradation of halloysite is primarily governed by bulk nucleation, succeeded by the 3-dimensional growth of meta-halloysite characterized by polyhedron-like structure, regulated by diffusion from a consistent number of nuclei. The frequency factor for halloysite dehydroxylation was established at 8.48 × 10⁸ s⁻1.
Citation
MENAD Heraiz ,
raghdi amina ,
Ahcen Keziz ,
Mohammed Rasheed, , (2024-11-09), Investigation of halloysite thermal decomposition through differential thermal analysis (DTA): Mechanism and kinetics assessment, 4th International Conference on Scientific and Academic Research on 19-20 July in 2024 at,
Vol:101, Issue:11, pages:101413, ELSEVIER
