TY  - JOUR
AU  - Radojević, Zagorka
AU  - Kostić-Gvozdenović, L.
AU  - Vasić, Radomir
PY  - 2002
UR  - http://rims.institutims.rs/handle/123456789/22
AB  - Anionic clays are becoming more important for their application as catalysts, ion exchangers and adsorbers and for medical applications as well. Anionic clays are also used as stabilizers of dispersive systems of ceramic suspensions and drilling fluids in the oil industry, The anionic clays have an appropriate use in ceramic industry during raw materials activation. This paper presents the results of the hydrotalcite Mg6Al2 (OH)(16)(CO3)(4)H2O synthesis at room temperature of 18 degreesC and pH values of reactant mixtures of pH=12 (synthesis I) and pH=10.5 (synthesis II). The reactants were basic magnesium carbonate (suspended in water) and solutions of AlCl3, Na2CO3 and NaOH. The identification of the synthesized hydrotalcite included the chemical, X-ray, IR, TGA and DTA analyses. The product of the synthesis I is the mixture of the following minerals: hydrotalcite, manasseite, bayerite and brucite. The product of synthesis II is hydrotalcite, together with basic magnesium carbonate that failed to react. The structural formula of synthetic hydrotalcite prepared at room temperature was determined by: [Mg0,64Al0,31(OH)(2)][(CO3)(0,16)0,62H(2)O]. For the synthesized hydrotalcite, the crystal size and morphology, the surface area and hence the catalytic activity varied dramatically with the crystallization temperature. At the crystallization temperature of 60 degreesC only thin, poorly crystallized platelets were obtained and very catalytic activity resulted.
PB  - Trans Tech Publications Ltd, Durnten-Zurich
T2  - Euro Ceramics VII, Pt 1-3
T1  - Anionic clay and hydrotalcite synthesis
EP  - 1766
SP  - 1763
VL  - 206-2
DO  - 10.4028/www.scientific.net/KEM.206-213.1763
ER  - 

@article{
author = "Radojević, Zagorka and Kostić-Gvozdenović, L. and Vasić, Radomir",
year = "2002",
abstract = "Anionic clays are becoming more important for their application as catalysts, ion exchangers and adsorbers and for medical applications as well. Anionic clays are also used as stabilizers of dispersive systems of ceramic suspensions and drilling fluids in the oil industry, The anionic clays have an appropriate use in ceramic industry during raw materials activation. This paper presents the results of the hydrotalcite Mg6Al2 (OH)(16)(CO3)(4)H2O synthesis at room temperature of 18 degreesC and pH values of reactant mixtures of pH=12 (synthesis I) and pH=10.5 (synthesis II). The reactants were basic magnesium carbonate (suspended in water) and solutions of AlCl3, Na2CO3 and NaOH. The identification of the synthesized hydrotalcite included the chemical, X-ray, IR, TGA and DTA analyses. The product of the synthesis I is the mixture of the following minerals: hydrotalcite, manasseite, bayerite and brucite. The product of synthesis II is hydrotalcite, together with basic magnesium carbonate that failed to react. The structural formula of synthetic hydrotalcite prepared at room temperature was determined by: [Mg0,64Al0,31(OH)(2)][(CO3)(0,16)0,62H(2)O]. For the synthesized hydrotalcite, the crystal size and morphology, the surface area and hence the catalytic activity varied dramatically with the crystallization temperature. At the crystallization temperature of 60 degreesC only thin, poorly crystallized platelets were obtained and very catalytic activity resulted.",
publisher = "Trans Tech Publications Ltd, Durnten-Zurich",
journal = "Euro Ceramics VII, Pt 1-3",
title = "Anionic clay and hydrotalcite synthesis",
pages = "1766-1763",
volume = "206-2",
doi = "10.4028/www.scientific.net/KEM.206-213.1763"
}

Radojević, Z., Kostić-Gvozdenović, L.,& Vasić, R.. (2002). Anionic clay and hydrotalcite synthesis. in Euro Ceramics VII, Pt 1-3
Trans Tech Publications Ltd, Durnten-Zurich., 206-2, 1763-1766.
https://doi.org/10.4028/www.scientific.net/KEM.206-213.1763

Radojević Z, Kostić-Gvozdenović L, Vasić R. Anionic clay and hydrotalcite synthesis. in Euro Ceramics VII, Pt 1-3. 2002;206-2:1763-1766.
doi:10.4028/www.scientific.net/KEM.206-213.1763 .

Radojević, Zagorka, Kostić-Gvozdenović, L., Vasić, Radomir, "Anionic clay and hydrotalcite synthesis" in Euro Ceramics VII, Pt 1-3, 206-2 (2002):1763-1766,
https://doi.org/10.4028/www.scientific.net/KEM.206-213.1763 . .

TY  - JOUR
AU  - Radojević, Zagorka
AU  - Kostić-Gvozdenović, L.
AU  - Tecilazic-Stevanović, M
PY  - 1999
UR  - http://rims.institutims.rs/handle/123456789/14
AB  - The aim of this paper is to contribute to the knowledge of the quantitative formulation of the ion exchange reaction in clays. The equilibrium was studied at 11 degrees C in a system of solutions of NaCl and MgCl2, the concentrations of which never exceeded 0.1 mol/dm(3), and the "Jelenkovac" montmorillonite, the particle size of which was below 2 mu m. The standard reaction Gibbs energy of the Mg-Na exchange determined by applying the Gapon equation (Delta(r)G(Mg)(0Na) = 11.9 kJ/mol) and that obtained according to Levy-Shainberg (Delta(r)G(Mg)(0Na) = 10.5 kJ/mol) showed a large degree of concordance. The latter method also includes the exchangeable ion activity coefficient obtained from ion-clay interaction data which includes data on the thickness of the intel layer space in the montmorillonite structure, as well as the thickness of the basis montmorillonite layer itself.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - The standard reaction Gibbs energy of the cation exchange reaction of the biionic (Mg,Na)-form of montmorillonite
EP  - 213
IS  - 3
SP  - 207
VL  - 64
UR  - https://hdl.handle.net/21.15107/rcub_rims_14
ER  - 

@article{
author = "Radojević, Zagorka and Kostić-Gvozdenović, L. and Tecilazic-Stevanović, M",
year = "1999",
abstract = "The aim of this paper is to contribute to the knowledge of the quantitative formulation of the ion exchange reaction in clays. The equilibrium was studied at 11 degrees C in a system of solutions of NaCl and MgCl2, the concentrations of which never exceeded 0.1 mol/dm(3), and the "Jelenkovac" montmorillonite, the particle size of which was below 2 mu m. The standard reaction Gibbs energy of the Mg-Na exchange determined by applying the Gapon equation (Delta(r)G(Mg)(0Na) = 11.9 kJ/mol) and that obtained according to Levy-Shainberg (Delta(r)G(Mg)(0Na) = 10.5 kJ/mol) showed a large degree of concordance. The latter method also includes the exchangeable ion activity coefficient obtained from ion-clay interaction data which includes data on the thickness of the intel layer space in the montmorillonite structure, as well as the thickness of the basis montmorillonite layer itself.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "The standard reaction Gibbs energy of the cation exchange reaction of the biionic (Mg,Na)-form of montmorillonite",
pages = "213-207",
number = "3",
volume = "64",
url = "https://hdl.handle.net/21.15107/rcub_rims_14"
}

Radojević, Z., Kostić-Gvozdenović, L.,& Tecilazic-Stevanović, M.. (1999). The standard reaction Gibbs energy of the cation exchange reaction of the biionic (Mg,Na)-form of montmorillonite. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 64(3), 207-213.
https://hdl.handle.net/21.15107/rcub_rims_14

Radojević Z, Kostić-Gvozdenović L, Tecilazic-Stevanović M. The standard reaction Gibbs energy of the cation exchange reaction of the biionic (Mg,Na)-form of montmorillonite. in Journal of the Serbian Chemical Society. 1999;64(3):207-213.
https://hdl.handle.net/21.15107/rcub_rims_14 .

Radojević, Zagorka, Kostić-Gvozdenović, L., Tecilazic-Stevanović, M, "The standard reaction Gibbs energy of the cation exchange reaction of the biionic (Mg,Na)-form of montmorillonite" in Journal of the Serbian Chemical Society, 64, no. 3 (1999):207-213,
https://hdl.handle.net/21.15107/rcub_rims_14 .