Back to Search
Start Over
Studies on intrinsic ionization constants of Fe–Al–Mg hydrotalcite-like compounds
- Source :
- Journal of Colloid and Interface Science. 257:244-249
- Publication Year :
- 2003
- Publisher :
- Elsevier BV, 2003.
-
Abstract
- The theoretical analysis of the intrinsic ionization constant (K(a2)(int)) of Fe-Al-Mg hydrotalcite-like compounds (HTlc) possessing permanent charges was first performed using the double extrapolation method proposed by James et al. The theoretical permanent charge density (sigma(p,T)) of the HTlc sample was calculated from the crystal structure of HTlc, and the influence of sigma(p,T) on the K(a2)(int) was also examined. From the experimental results, these conclusions can be obtained: the zero point of the charge (pH(ZPC)) of Fe-Al-Mg HTlc increases with decreased Fe3+ content and increases with increased Mg2+ in the HTlc. The pK(a2)(int) of Fe-Al-Mg HTlc also increases with decreased Fe3+ and increased Mg2+ content in the sample; furthermore, the pK(a2)(int) of Fe-Al-Mg HTlc increases with decreased sigma(p,T).
- Subjects :
- Hydrotalcite
Magnesium
Coprecipitation
Aluminium hydroxide
Analytical chemistry
Charge density
chemistry.chemical_element
Crystal structure
Acid dissociation constant
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Biomaterials
chemistry.chemical_compound
Colloid and Surface Chemistry
chemistry
Ionization
Subjects
Details
- ISSN :
- 00219797
- Volume :
- 257
- Database :
- OpenAIRE
- Journal :
- Journal of Colloid and Interface Science
- Accession number :
- edsair.doi.dedup.....30a8a480be3ac9c6b010ceddb9f964a4