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A Comparative Study on the Sorption of BTEX and Cr (VI) in Drinking Water by Anionic and Cationic Sorbents

Published online by Cambridge University Press:  01 February 2011

S. O Flores-Valle ,
S. P. Paredes Carrera  and
M. A. Valenzuela-Zapata
S. O Flores-Valle*
Affiliation:
Instituto Politécnico Nacional, ESIQIE, Laboratorio de Catálisis y Materiales, Av. IPN S/N Zacatenco, 07738, D. F., México.
S. P. Paredes Carrera
Affiliation:
Instituto Politécnico Nacional, ESIQIE, Laboratorio de Catálisis y Materiales, Av. IPN S/N Zacatenco, 07738, D. F., México.
M. A. Valenzuela-Zapata
Affiliation:
Instituto Politécnico Nacional, ESIQIE, Laboratorio de Catálisis y Materiales, Av. IPN S/N Zacatenco, 07738, D. F., México.
*
*Corresponding author, Email: [email protected]
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Abstract

A comparative study of different sorbent materials was performed in order to propose an integrated system to eliminate both, anionic and cationic contaminant ions in drinking water, such as Cr (VI) and BTEX (benzene, toluene, ethylbenzene and xylenes). The adsorption process was studied using several adsorbents: activated carbon, cationic clays (bentonite) and natural zeolite as well as anionic clays (Al-Mg/Nitrate hydrotalcites). The activated carbon and natural zeolites were commercial samples, while hydrotalcite-like compounds were synthesized by an ultrasound-assisted method. It was found that although activated carbon showed a good performance in the cationic sorption, the calcined hydrotalcites presented the highest sorption capacity of chromates compared with activated carbon which had a good performance only up to 100 ppm. For higher concentrations (>100 ppm) activated carbon is saturated rapidly and its sorptive capacity is practically null.

Keywords

Water decontaminationCationic SorbentsAnionic SorbentsNitrated hydrotalcite-like compounds
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1279: New Catalytic Materials , 2010 , 35
Copyright
Copyright © Materials Research Society 2010

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