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Sorption of chrysoidine by row cork and cork entrapped in calcium alginate beads

Nurchi, Valeria Marina and Crespo-Alonso, Miriam and Biesuz, Raffaela and Alberti, Giancarla and Pilo, Maria Itria and Spano, Nadia and Sanna, Gavino (2014) Sorption of chrysoidine by row cork and cork entrapped in calcium alginate beads. Arabian journal of chemistry, Vol. 7 (1), p. 133-138. ISSN 1878-5352. eISSN 1878-5379. Article.

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DOI: 10.1016/j.arabjc.2013.07.006

Abstract

Azo-dyes, molecules characterised by the presence of the azo-group (–NN–), are widely used in textile, leather, rubber, plastic, and food industries. Water-soluble azo-dyes are greatly resistant to biodegradation, and are characterised by a high thermal and photo stability due to their complex structures. The release of these molecules into the environment is of crucial concern due to their toxic, mutagenic and carcinogenic characteristics. Biosorption has been demonstrated an effective method to remove pollutants from wastewaters thus solving ecological tasks, being a low cost process and the sorbent biodegradable. The main requirements of an efficient sorbent are thermal, chemical and mechanical stability, and rapid sorption.
In this work, the ability of both row cork and the same sorbent entrapped in a biopolymeric gel of calcium alginate, on the removal of chrysoidine from aqueous solutions was examined.
The influence on the sorption of pH, initial dye concentration, and particle size, as well as the efficiency of the entrapment, have been investigated. The maximum sorption was found for cork samples of fine particle size (FC), in both row and entrapped forms, at pH 7; conversely, at pH 4 the difference is significant (0.12 mmol/g for row cork and 0.20 mmol/g for entrapped cork), evoking a cooperation of alginate in binding the positively charged chrysoidine molecule.

Item Type:Article
ID Code:9865
Status:Published
Refereed:Yes
Uncontrolled Keywords:Chrysoidine, sorption mechanism, Calcium alginate, protonation constant
Subjects:Area 03 - Scienze chimiche > CHIM/01 Chimica analitica
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Chimica e Farmacia
Publisher:Elsevier / King Saud University
ISSN:1878-5352
eISSN:1878-5379
Copyright Holders:© 2013 Production and hosting by Elsevier B.V. on behalf of King Saud University
Deposited On:10 Jun 2014 12:47

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