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Effect of the Thermal Treatment on the Capacity of Removal of Cr (VI) of Sol-Gel Hydrotalcite-like Materials

Published online by Cambridge University Press:  31 January 2012

E. Ramos ,
N. L. Gutiérrez ,
C. A. Contreras  and
G. A. del Angel
E. Ramos*
Affiliation:
Departamento de Química, División de Ciencias Naturales y Exactas, Campus Guanajuato, Universidad de Guanajuato, Noria Alta s/n, Col. Noria Alta, C.P: 36050, Guanajuato, Gto., México.
N. L. Gutiérrez
Affiliation:
Departamento de Ingeniería Civil, División de Ingenierías, Campus Guanajuato, Universidad de Guanajuato, Av. Juarez No. 77, Zona Centro; C.P. 36000; Guanajuato, Gto., México
C. A. Contreras
Affiliation:
Departamento de Química, División de Ciencias Naturales y Exactas, Campus Guanajuato, Universidad de Guanajuato, Noria Alta s/n, Col. Noria Alta, C.P: 36050, Guanajuato, Gto., México.
G. A. del Angel
Affiliation:
Departamento de Química, División de Ciencias Básicas e Ingeniería de la Universidad Autónoma Metropolitana-Iztapalapa, Av. San Rafael Atlixco No. 186, Col. Vicentina, C.P: 09340, México, D. F.
*
*Email: ramosre@ugto.mx
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Abstract

In this work the effect on the adsorption of Cr (VI) by thermally treated Hydrotalcite-like Material (HTM) synthesized by the sol-gel method with a Mg/Al = 2 was studied. The characterization of the HTM before and after Cr (VI) removal, as well as the kinetic studies were carried out. When the HTM are thermally treated at 350ºC the hydrotalcite crystalline structure remains and the textural properties improve. The Cr (VI) adsorption capacity of HTM was 125 mg of Cr (VI) / g of HTM. This capacity augments at 132 mg of Cr (VI) / g of HTM after heating HTM at 300°C. The crystallinity as well the porosity of the HTM diminished after adsorption of Cr (VI), due to the obstruction of both the pores and the interlayer space. The adsorption of Cr (VI) occurred before 4 minutes contact time. It can be concluded that HTM exhibits a high Cr (VI) adsorption capacity in a short time.

Keywords

AbsorptionIon-exchange materialPorositySol-gelTextureWaste management
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1372: Symposium S3 – Structural and Chemical Characterization of Metal Alloys and Compounds—2011 , 2012 , imrc-1372-s3-62
Copyright
Copyright © Materials Research Society 2012

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