Non-linear modeling of kinetic and equilibrium data for the adsorption of hexavalent chromium by carbon nanomaterials: Dimension and functionalization

doi:10.1016/j.cjche.2018.08.024

Chinese Journal of Chemical Engineering ›› 2019, Vol. 27 ›› Issue (4): 912-919.DOI: 10.1016/j.cjche.2018.08.024

• Energy, Resources and Environmental Technology • Previous Articles Next Articles

Non-linear modeling of kinetic and equilibrium data for the adsorption of hexavalent chromium by carbon nanomaterials: Dimension and functionalization

Miguel de la Luz-Asunción^1,2, Eduardo E. Pérez-Ramírez², Ana L. Martínez-Hernández², Victor M. Castano³, Víctor Sánchez-Mendieta¹, Carlos Velasco-Santos²

1 Facultad de Química, Universidad Autónoma del Estado de México, Km. 12 de la carretera Toluca-Atlacomulco, C. P. 50200, San Cayetano, Toluca, Estado de México, Mexico;
2 Tecnológico Nacional de México-Instituto Tecnológico de Querétaro, División de Estudios de Posgrado e Investigación, Av. Tecnológico s/n, esq. Gral. Mariano Escobedo, Col. Centro Histórico, C. P. 76000 Santiago de Querétaro, Querétaro, Mexico;
3 Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, Querétaro 76230, Mexico

Received:2018-05-11 Revised:2018-08-23 Online:2019-06-14 Published:2019-04-28
Contact: Carlos Velasco-Santos

Non-linear modeling of kinetic and equilibrium data for the adsorption of hexavalent chromium by carbon nanomaterials: Dimension and functionalization

Miguel de la Luz-Asunción^1,2, Eduardo E. Pérez-Ramírez², Ana L. Martínez-Hernández², Victor M. Castano³, Víctor Sánchez-Mendieta¹, Carlos Velasco-Santos²

1 Facultad de Química, Universidad Autónoma del Estado de México, Km. 12 de la carretera Toluca-Atlacomulco, C. P. 50200, San Cayetano, Toluca, Estado de México, Mexico;
2 Tecnológico Nacional de México-Instituto Tecnológico de Querétaro, División de Estudios de Posgrado e Investigación, Av. Tecnológico s/n, esq. Gral. Mariano Escobedo, Col. Centro Histórico, C. P. 76000 Santiago de Querétaro, Querétaro, Mexico;
3 Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, Querétaro 76230, Mexico

通讯作者: Carlos Velasco-Santos

Abstract

Abstract: The adsorption capacities for the removal of hexavalent chromium from aqueous solutions by six carbon nanomaterials have been evaluated. Single-walled and multi-walled carbon nanotubes as received and after oxidation treatment, graphene oxide and reduced graphene oxide are the materials with different dimension and functionalization compared in this research. Carbon nanotubes have been modified using hydrogen peroxide as oxidizing agent under microwave radiation. The oxidation treatment on carbon nanotubes has a positive effect increasing the adsorbent-adsorbate interaction. Rate-controlling mechanisms and equilibrium data are analyzed using non-linear models. Non-linear method is proposed as the most suitable method for determining the kinetic and equilibrium parameters. The values of adsorption energy (E) obtained from the Dubinin-Radushkevich isotherm, have been found around 0.371 and 0.870 kJ·mol^-1, indicating physical adsorption. Therefore, the pseudo-second order model represents better the kinetic experimental data. The results show that the Langmuir isotherm provides a slightly better fit to the experimental data compared with the Freundlich isotherm, indicating homogeneous distribution of active sites on carbon nanomaterials and monolayer adsorption. The separation factors R_L are found in the range of 0-1, suggesting that the adsorption process is suitable for all adsorbents. The mechanisms for hexavalent chromium removal have been proposed as electrostatic interactions and hydrogen bonding.

Key words: Carbon nanotubes, Graphene, Adsorption, Hexavalent chromium, Kinetic

摘要： The adsorption capacities for the removal of hexavalent chromium from aqueous solutions by six carbon nanomaterials have been evaluated. Single-walled and multi-walled carbon nanotubes as received and after oxidation treatment, graphene oxide and reduced graphene oxide are the materials with different dimension and functionalization compared in this research. Carbon nanotubes have been modified using hydrogen peroxide as oxidizing agent under microwave radiation. The oxidation treatment on carbon nanotubes has a positive effect increasing the adsorbent-adsorbate interaction. Rate-controlling mechanisms and equilibrium data are analyzed using non-linear models. Non-linear method is proposed as the most suitable method for determining the kinetic and equilibrium parameters. The values of adsorption energy (E) obtained from the Dubinin-Radushkevich isotherm, have been found around 0.371 and 0.870 kJ·mol^-1, indicating physical adsorption. Therefore, the pseudo-second order model represents better the kinetic experimental data. The results show that the Langmuir isotherm provides a slightly better fit to the experimental data compared with the Freundlich isotherm, indicating homogeneous distribution of active sites on carbon nanomaterials and monolayer adsorption. The separation factors R_L are found in the range of 0-1, suggesting that the adsorption process is suitable for all adsorbents. The mechanisms for hexavalent chromium removal have been proposed as electrostatic interactions and hydrogen bonding.

关键词: Carbon nanotubes, Graphene, Adsorption, Hexavalent chromium, Kinetic

Miguel de la Luz-Asunción, Eduardo E. Pérez-Ramírez, Ana L. Martínez-Hernández, Victor M. Castano, Víctor Sánchez-Mendieta, Carlos Velasco-Santos. Non-linear modeling of kinetic and equilibrium data for the adsorption of hexavalent chromium by carbon nanomaterials: Dimension and functionalization[J]. Chinese Journal of Chemical Engineering, 2019, 27(4): 912-919.

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Non-linear modeling of kinetic and equilibrium data for the adsorption of hexavalent chromium by carbon nanomaterials: Dimension and functionalization

Non-linear modeling of kinetic and equilibrium data for the adsorption of hexavalent chromium by carbon nanomaterials: Dimension and functionalization

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