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Abstract:

FTIR-ATR kinetic studies on the adsorption of oxalic acid on different TiO2 films were performed. The particulate films were obtained through the evaporation of TiO2 suspensions. The evolution of the IR bands followed a pseudo-first-order behavior, as previously observed. Systematic studies as a function of the oxalic acid concentration afforded the specific rate constant for adsorption (ka) and desorption (kd). The influence of physical parameters of the samples, i.e., specific BET area, crystalline domain size, TiO2 load, film area, and pore size, on the kinetic parameters ka and kd was analyzed. A mechanism in which the adsorption and desorption processes are controlled by the diffusion through the pores of the films is proposed (intraparticle diffusion). It is concluded that all the samples behave in the same way. Thicker films or those with smaller particle size (higher specific surface area, smaller pores) show the slowest rates of adsorption and desorption. These results are relevant for the design of efficient heterogeneous catalysts and sensors, and for the interpretation of pollutant adsorption. © 2010 Elsevier Inc.

Registro:

Documento: Artículo
Título:Kinetics of adsorption of oxalic acid on different titanium dioxide samples
Autor:Roncaroli, F.; Blesa, M.A.
Filiación:Gerencia de Química, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Avenida General Paz 1499, 1650 San Martín, Buenos Aires, Argentina
Departamento de Química Inorgánica, Analítica y Química-Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina
Instituto de Investigaciones e Ingeniería Ambiental, Universidad Nacional de San Martín, Buenos Aires, Argentina
Palabras clave:Adsorption; ATR; FTIR; Kinetics; Oxalic acid; Surface complexation; TiO2; Titanium dioxide; ATR; FTIR; Oxalic Acid; Surface complexation; TiO; Desorption; Organic acids; Oxides; Rate constants; Titanium; Titanium dioxide; Adsorption; oxalic acid; titanium dioxide; adsorption kinetics; article; catalyst; concentration (parameters); desorption; diffusion; evaporation; evolution; film; infrared spectroscopy; particle size; particulate matter; pollutant; priority journal; sensor; suspension
Año:2011
Volumen:356
Número:1
Página de inicio:227
Página de fin:233
DOI: http://dx.doi.org/10.1016/j.jcis.2010.11.051
Título revista:Journal of Colloid and Interface Science
Título revista abreviado:J. Colloid Interface Sci.
ISSN:00219797
CODEN:JCISA
CAS:oxalic acid, 144-62-7; titanium dioxide, 1317-70-0, 1317-80-2, 13463-67-7, 51745-87-0
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00219797_v356_n1_p227_Roncaroli

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Citas:

---------- APA ----------
Roncaroli, F. & Blesa, M.A. (2011) . Kinetics of adsorption of oxalic acid on different titanium dioxide samples. Journal of Colloid and Interface Science, 356(1), 227-233.
http://dx.doi.org/10.1016/j.jcis.2010.11.051
---------- CHICAGO ----------
Roncaroli, F., Blesa, M.A. "Kinetics of adsorption of oxalic acid on different titanium dioxide samples" . Journal of Colloid and Interface Science 356, no. 1 (2011) : 227-233.
http://dx.doi.org/10.1016/j.jcis.2010.11.051
---------- MLA ----------
Roncaroli, F., Blesa, M.A. "Kinetics of adsorption of oxalic acid on different titanium dioxide samples" . Journal of Colloid and Interface Science, vol. 356, no. 1, 2011, pp. 227-233.
http://dx.doi.org/10.1016/j.jcis.2010.11.051
---------- VANCOUVER ----------
Roncaroli, F., Blesa, M.A. Kinetics of adsorption of oxalic acid on different titanium dioxide samples. J. Colloid Interface Sci. 2011;356(1):227-233.
http://dx.doi.org/10.1016/j.jcis.2010.11.051