Alginate-iron modified zeolite beads biocomposite for removal of azo dye from water medium
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MRS Advances © 2018 Materials Research Society DOI: 10.1557/adv.2018.642
Alginate-iron modified zeolite beads biocomposite for removal of azo dye from water medium Samantha Ortega-Aguirre,1 María del Carmen Díaz-Nava,1,* Marcos J. Solache-Ríos,2 Javier Illescas1,§ 1 Laboratorio de Investigación en Ingeniería Ambiental, División de Estudios de Posgrado e Investigación, Instituto Tecnológico de Toluca, Av. Tecnológio S/N, Col. Agrícola Bellavista, C.P. 52149. Metepec, Estado de México.
2
Instituto Nacional de Investigaciones Nucleares (ININ), Departamento de Química, México
§
CONACYT Research Fellow.
ABSTRACT
Organic compounds such as azo dyes have been detected in wastewater due to their use in industries without regulation. Conventional wastewater treatments are not always effective in the removal of these pollutants. Among the innovative materials that deal with this problem, are the polymer-zeolitic composites used as adsorbents. Modified natural zeolites have been proven to be efficient for the removal of yellow 6; on the other hand, biopolymers such as alginate offer their potential use as a polymer matrix for the synthesis of biocomposites. In this study, the adsorbent properties of a ferric zeolite and an alginate-ferric zeolite composite were determined for the removal of yellow 6 dye from aqueous solutions. The X-ray diffraction (XRD) results of both natural and modified zeolites indicated the presence of clinoptilolite. The characteristic bands of these materials were identified through the Fourier Transform Infrared Spectroscopy (FTIR) technique. Moreover, the presence of iron in the ferrous zeolite was verified by elemental analysis (EDS). Adsorption tests showed that the composite has a lower removal capacity than the zeolitic material; however, in the case of water treatment systems, the composite would be easier to handle than the zeolite without supporting it in a polymer matrix.
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INTRODUCTION Composites are solid materials resulting from the combination of two or more simple materials that are present in two phases. Nowadays, the use of biopolymers has been chosen for the synthesis of composites due to its biodegradability or natural origin [1]. Likewise, biocomposites are materials that have been reported for the removal of organic compounds in wastewater. Currently, azo dyes have been detected in wastewater due to their widespread use in different industries. The presence of dyes in water is an indication of pollution; even in small concentrations they cause environmental problems. They can reduce fish or algae populations because of their high nitrogen content which exhausts the dissolved oxygen in water; and even if the dye is not directly toxic to living organisms, the coloration can suppress the photosynthesis process. It has been reported the r
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