naa a22 4500 510751768 CHVBK 20180411083107.0 cr unu---uuuuu 180411e20130501xx s 000 0 eng 10.1007/s11270-013-1562-9 doi (NATIONALLICENCE)springer-10.1007/s11270-013-1562-9 Removal of Brilliant Blue FCF from Aqueous Solutions Using an Unmodified and Iron-Modified Bentonite and the Thermodynamic Parameters of the Process [Elektronische Daten] [K. Hernández-Hernández, M. Solache-Ríos, M. Díaz-Nava] The sorption behaviors of brilliant blue FCF dye by natural clay and modified with iron chloride were determined. The materials were characterized by X-ray diffraction and scanning electron microscopy, and the zero point charges were also determined. The effects of pH, contact time, dye concentration, and temperature were considered. The results showed that clay does not suffer any important change in its structure after the chemical treatments. The pH influences the sorption of the dye in the unmodified clay, but this effect was not observed in the iron-modified clay. The equilibrium time and the sorption capacity for the unmodified clay were 48h and 6.16mg/g, while for the iron-modified clay, 24h and 14.22mg/g, respectively. The sorption kinetics results were best adjusted to the pseudo-first-order and pseudo-second-order models. Sorption isotherms were best adjusted to the Langmuir model, indicating that both clays have a homogeneous surface. Thermodynamic parameters (E, ΔS, ΔG and ΔH) were calculated for the natural clay from the data of the sorption kinetics at temperatures between 20 and 50°C, indicating that the sorption process is exothermic. For the case of the iron-modified clay, it was not possible to calculate these thermodynamic parameters because the sorption capacities were similar in the temperature range selected. Springer Science+Business Media Dordrecht, 2013 Bentonite nationallicence Brilliant blue FCF nationallicence Adsorption nationallicence Iron nationallicence Thermodynamics nationallicence Hernández-Hernández K. Departamento de Química, Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, Col. Escandón, Delegación Miguel Hidalgo, 11801, Mexico, Federal District, Mexico aut Solache-Ríos M. Departamento de Química, Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, Col. Escandón, Delegación Miguel Hidalgo, 11801, Mexico, Federal District, Mexico aut Díaz-Nava M. División de Estudios de Posgrado, Instituto Tecnológico de Toluca, Av. Tecnológico s/n, Ex Rancho La Virgen, 52140, Metepec, State of Mexico, Mexico aut Water, Air, & Soil Pollution Springer Netherlands 224/5(2013-05-01), 1-11 0049-6979 224:5<1 2013 224 11270 https://doi.org/10.1007/s11270-013-1562-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-013-1562-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hernández-Hernández K. Departamento de Química, Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, Col. Escandón, Delegación Miguel Hidalgo, 11801, Mexico, Federal District, Mexico aut NATIONALLICENCE 700 1- Solache-Ríos M. Departamento de Química, Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, Col. Escandón, Delegación Miguel Hidalgo, 11801, Mexico, Federal District, Mexico aut NATIONALLICENCE 700 1- Díaz-Nava M. División de Estudios de Posgrado, Instituto Tecnológico de Toluca, Av. Tecnológico s/n, Ex Rancho La Virgen, 52140, Metepec, State of Mexico, Mexico aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/5(2013-05-01), 1-11 0049-6979 224:5<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer