RAGHDI Amina
رغدي آمينة
amina.raghdi@univ-msila.dz
0
- Departement of Chemistry
- Faculty of Sciences
- Grade MCB
About Me
Location
Msila, Msila
Msila, ALGERIA
Code RFIDE- 1989-10-18 00:00:00
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RAGHDI Amina birthday
- 2024-11-09
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2024-11-09
Investigation of halloysite thermal decomposition through differential thermal analysis (DTA): Mechanism and kinetics assessment
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
- 2018-01-11
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2018-01-11
Thermal Dehydroxylation Kinetics of Algerian Halloysite by Differential Thermal Analysis
In this study, the dehydroxylation of Algerian halloysite (DD1) was studied using differential thermal analysis. Measurements of samples were performed between room temperature and 1400 ◦C, at different heating rates of 10, 20, 30, 40 and 50 ◦Cmin−1. The activation energy calculated from isothermal (using Johnson-Mehl-Avrami and Ligero methods) and non-isothermal treatments (using Kissinger-Akahira-Sunose) were 135 kJ/mol and 153 kJ/mol, respectively. The Avrami parameter obtained by method of Ligero and the m parameter (a numerical factor) obtained by Matusita method were 1.55 and 1.59, respectively. The results show that bulk nucleation was dominant in halloysite transformation, followed by three-dimensional growth of meta-halloysite. This growth is controlled by diffusion from a constant number of nuclei. The frequency factor calculated by the isothermal treatment is equalto 4:16 × 106 s−1.
Citation
Foudil SAHNOUNE , raghdi amina , MENAD Heraiz , , (2018-01-11), Thermal Dehydroxylation Kinetics of Algerian Halloysite by Differential Thermal Analysis, Acta Physica Polonica A,, Vol:134, Issue:1, pages:79-81, POLISH ACAD SCIENCES INST PHYSICS