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Surface modification of mechanochemically activated kaolinites by selective leaching.
Eva Makó1, Zsuzsa Senkár, János Kristóf
1Department of Silicate and Materials Engineering, University of Veszprém, H-8201 Veszprém, P.O. Box 158, Hungary. makoe@almos.vein.hu
Journal of Colloid and Interface Science
|August 23, 2005
Summary
Mechanochemical activation enhances kaolinite
Area of Science:
- Materials Science and Engineering
- Geochemistry
- Mineralogy
Background:
- Kaolinite, a common clay mineral, exhibits varying defect levels.
- Mechanochemical activation is a method to alter material properties.
- Sulfuric acid treatment is used to modify mineral structures and surfaces.
Purpose of the Study:
- To investigate the effect of sulfuric acid treatment on mechanochemically activated kaolinites.
- To compare the acid reactivity of low- and high-defect kaolinites with different activation times.
- To analyze the changes in material properties such as surface area and pore volume.
Main Methods:
- Mechanochemical activation of low- and high-defect kaolinites.
- Sulfuric acid treatment of activated kaolinites.
- Analysis using X-ray diffraction, thermogravimetry, chemical analysis, FTIR spectroscopy, and BET surface area measurements.
Main Results:
- Both disordered and distorted kaolinite phases reacted with sulfuric acid.
- Mechanochemically activated kaolinites showed higher specific surface areas after acid leaching compared to thermally activated ones.
- Partial amorphization led to greater total pore volume than complete amorphization.
- High-defect kaolinite exhibited higher solubility than low-defect kaolinite after acid treatment.
Conclusions:
- Mechanochemical activation significantly enhances the reactivity of kaolinite towards sulfuric acid.
- The degree of kaolinite defect and activation influences its acid solubility and structural changes.
- Optimized activation and acid treatment can be used to tailor kaolinite properties for specific applications.