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Abstract:

An adequate account of the hydrolytic properties of Cr3+ and Ni2+ allows setting the conditions for homogeneous nucleation of layered Ni(II)-Cr(III) double hydroxides; water exchange and hydrolysis rate constants indicate that, at very high rates of base dosing, formation of heteronuclear Cr(III)-Ni(II) hydroxo species should prevail over precipitation of active Cr(OH)3. This is realized by the urea method under microwave-assisted hydrothermal conditions. This approach yields crystalline Ni1-xCrx(OH)2(CO3)x/2ṡnH2O (x ≈ 0.32 - 0.36) in less than 5 min at 453 K; higher degrees of crystallinity are obtained at higher temperatures and/or longer aging times. Formation of Ni(II)-Cr(III) LDHs upon microwave-assisted hydrothermal aging of freshly coprecipitated Ni(OH)2 + Cr(OH)3 mixtures takes longer, due to a different operating mechanism. The implications of the advanced rationale for the design of synthesis procedures are stressed. It is proposed that homogeneous nucleation of Ni(II)-Cr(III) LDHs involves the edge-on condensation of planar heteronuclear Cr(III)-Ni(II) hydroxo trimers. Ordered aggregation of primary particles leads to the final platelet crystals, a process that involves the exchange of CO2-3 ions dangling at the crystallites' edges by bridging OH-. © 2007 Elsevier Inc. All rights reserved.

Registro:

Documento: Artículo
Título:Homogeneous precipitation of layered Ni(II)-Cr(III) double hydroxides
Autor:Jobbágy, M.; Blesa, M.A.; Regazzoni, A.E.
Filiación:INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellon II, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina
Unidad de Actividad Química, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Av. General Paz 1499, B1650KNA San Martín, Argentina
Escuela de Posgrado, Universidad Nacional de General San Martín, Av. General Paz 1499, B1650KNA San Martín, Argentina
Instituto de Tecnología Jorge Sábato, Universidad Nacional de General San Martín, Av. General Paz 1499, B1650KNA San Martín, Argentina
Palabras clave:Chromium hydroxide; Homogeneous precipitation; Hydrotalcites; Layered double hydroxides; Nickel hydroxide; Chromium alloys; Dangling bonds; Hydrolysis; Microwaves; Nucleation; Precipitation (chemical); Urea; Homogeneous precipitation; Hydrotalcites; Layered double hydroxides; Nickel hydroxide; Nickel alloys; carbon dioxide; chromium; hydroxide; hydroxyl group; nickel; water; aging; article; chemical stress; crystal; hydrolysis; microwave radiation; particulate matter; polymerization; precipitation; priority journal; synthesis; urea cycle; water temperature
Año:2007
Volumen:309
Número:1
Página de inicio:72
Página de fin:77
DOI: http://dx.doi.org/10.1016/j.jcis.2007.01.010
Título revista:Journal of Colloid and Interface Science
Título revista abreviado:J. Colloid Interface Sci.
ISSN:00219797
CODEN:JCISA
CAS:carbon dioxide, 124-38-9, 58561-67-4; chromium, 16065-83-1, 7440-47-3; hydroxide, 14280-30-9; nickel, 7440-02-0; water, 7732-18-5
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00219797_v309_n1_p72_Jobbagy

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Citas:

---------- APA ----------
Jobbágy, M., Blesa, M.A. & Regazzoni, A.E. (2007) . Homogeneous precipitation of layered Ni(II)-Cr(III) double hydroxides. Journal of Colloid and Interface Science, 309(1), 72-77.
http://dx.doi.org/10.1016/j.jcis.2007.01.010
---------- CHICAGO ----------
Jobbágy, M., Blesa, M.A., Regazzoni, A.E. "Homogeneous precipitation of layered Ni(II)-Cr(III) double hydroxides" . Journal of Colloid and Interface Science 309, no. 1 (2007) : 72-77.
http://dx.doi.org/10.1016/j.jcis.2007.01.010
---------- MLA ----------
Jobbágy, M., Blesa, M.A., Regazzoni, A.E. "Homogeneous precipitation of layered Ni(II)-Cr(III) double hydroxides" . Journal of Colloid and Interface Science, vol. 309, no. 1, 2007, pp. 72-77.
http://dx.doi.org/10.1016/j.jcis.2007.01.010
---------- VANCOUVER ----------
Jobbágy, M., Blesa, M.A., Regazzoni, A.E. Homogeneous precipitation of layered Ni(II)-Cr(III) double hydroxides. J. Colloid Interface Sci. 2007;309(1):72-77.
http://dx.doi.org/10.1016/j.jcis.2007.01.010