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Sorption of heavy metals from industrial waste water by low-cost mineral silicates

Published online by Cambridge University Press:  09 July 2018

A. Garcia Sanchez ,
E. Alvarez Ayuso  and
O. Jimenez de Blas
A. Garcia Sanchez
Affiliation:
Departamento de Química y Geoquímica Medioambiental, Instituto de Recursos Naturales y Agrobiología, CSIC, Apdo. 257. 37071 Salamanca
E. Alvarez Ayuso
Affiliation:
Departamento de Química y Geoquímica Medioambiental, Instituto de Recursos Naturales y Agrobiología, CSIC, Apdo. 257. 37071 Salamanca
O. Jimenez de Blas
Affiliation:
Departamento de Química Analítica, Nutrición y Bromatología, Facultad de Ciencias Químicas, Pza. de la Merced s/n, 37008 Salamanca, Spain
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Abstract

The adsorption by different silicate minerals of some heavy metals, present in industrial waste water, has been studied. These adsorbents (mainly clay minerals) are readily available, inexpensive materials and offer a cost-effective alternative to conventional treatment of wastes from the metal finishing industry. The results show that some mineral species are suitable for the purification of such residual waters down to the limits prescribed by current legislation concerning industrial wastes. The Langmuir model was found to describe such adsorption processes best. Sepiolite (Orera, Spain) has an adsorption capacity of 8.26 mg g-1 for Cd2+, the capacities depending on the metal adsorbed in the order: Cd2+ > Cu2+ > Zn2+ > Ni2+. This mineral shows the highest sorption capacity relative to the other minerals studied. Factors in the reaction medium such as pH and ionic strength influenced the adsorption process.

Type
Research Article
Information
Clay Minerals , Volume 34 , Issue 3 , September 1999 , pp. 469 - 477
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1999

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