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      Adsorption of Direct Blue 78 Using Chitosan and Cyclodextrins as Adsorbents

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          Abstract

          The dyeing industry is one of the most polluting in the world. The adsorption of dyes by polymeric matrixes can be used to minimize the discharge of dyes into the environment. In the present study, chitosan-NaOH and β-cyclodextrin-epichlorohydrin polymers were used to remove the dye Direct Blue 78 from a wastewater model. To understand the adsorption behavior of Direct Blue 78 onto the polymers, adsorption rate and maximum adsorption capacity were calculated using kinetic tests and isotherm curves respectively. The kinetic data and mechanism of the adsorption process were analyzed by three models and the equilibrium data by three adsorption isotherms; also the different thermodynamic parameters were calculated. Results showed that the adsorption process follows pseudo-second-order kinetics in both polymers and the Langmuir isotherm best-fitted data for chitosan-NaOH polymer and the Freundlich isotherm for the β-CDs-EPI polymer. The adsorption process is exothermic in both cases and spontaneous for the β-CDs-EPI polymer to a certain temperature and not spontaneous for the chitosan-NaOH polymer and β-CDs-EPI polymer at higher temperatures. The complementary action of an advanced oxidation process eliminated >99% of the dye from water. The coupled process seems to be suitable for reducing the environmental impact of the dyeing industry.

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          Kinetics of Adsorption on Carbon from Solution

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            Application of chitosan, a natural aminopolysaccharide, for dye removal from aqueous solutions by adsorption processes using batch studies: A review of recent literature

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              Adsorption of dyes and heavy metal ions by chitosan composites: A review

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                Author and article information

                Journal
                Polymers (Basel)
                Polymers (Basel)
                polymers
                Polymers
                MDPI
                2073-4360
                05 June 2019
                June 2019
                : 11
                : 6
                : 1003
                Affiliations
                [1 ]Health Sciences Ph.D. Program, Universidad Católica de Murcia (UCAM), Campus de los Jerónimos, 135, Guadalupe, 30107 Murcia, Spain; amurcia6@ 123456alu.ucam.edu
                [2 ]Dpto. de Ciencias de la Salud, Universidad Católica de Murcia (UCAM), Campus de los Jerónimos, 135, Guadalupe, 30107 Murcia, Spain; japellicer@ 123456ucam.edu (J.A.P.); mifortea@ 123456ucam.edu (M.I.F.); vmgomez@ 123456ucam.edu (V.M.G.-L.); mirodriguez@ 123456ucam.edu (M.I.R.-L.); enunez@ 123456ucam.edu (E.N.-D.)
                Author notes
                [* ]Correspondence: jagabaldon@ 123456ucam.edu ; Tel.: +34-968-278-622
                Author information
                https://orcid.org/0000-0002-6748-4738
                https://orcid.org/0000-0002-0554-2365
                https://orcid.org/0000-0002-6649-2920
                Article
                polymers-11-01003
                10.3390/polym11061003
                6631907
                31195681
                663d2092-3c60-458a-9683-f48c2cb04a43
                © 2019 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 07 May 2019
                : 03 June 2019
                Categories
                Article

                adsorption,chitosan,β-cds,direct blue,kinetics,isotherm,pulsed light

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