Chitosan supported CoFe 2 O 4 for the removal of anthraquinone dyes: kinetics, equilibrium and thermodynamics studies
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Chitosan supported CoFe2O4 for the removal of anthraquinone dyes: kinetics, equilibrium and thermodynamics studies Abideen Idowu Adeogun1,2 · Oluremi Abosede Osideko1 · Mopelola Abidemi Idowu1 · Vahidhabanu Shappur2 · Oluseyi Adeboye Akinloye3 · B. Ramesh Babu2 Received: 31 January 2020 / Accepted: 16 March 2020 © Springer Nature Switzerland AG 2020
Abstract Chitosan supported cobalt ferrite nanocomposite (Cs–CoFe2O4) was synthesized and characterized. The synthesized Cs–CoFe2O4 was used for the removal of Anthraquinone dyes (Methylene Green, MG and Reactive blue 4, RB4) from aqueous solution in batch processes. Kinetics data were subjected to pseudo-first-order and pseudo-second-order, Elovich and intra-particle diffusion models, while the equilibrium data were evaluated with Langmuir, Freundlich, Temkin and Dubinin–Radushkevich isotherm models. The results of characterizations revealed that CoFe2O4 was successfully incorporated into the Cs, with resulting composite retaining its magnetic properties and the functional group in the Cs. Considering the closeness Qe(exp) and Qe(cal.), also the values of R2 and %SSE, the MG adsorption followed pseudosecond-order with average rate constants of 8.3 × 10−3 min−1 while the adsorption kinetic of RB4 is best described by pseudo-first-order model with average rate constant of 2.91 × 10−2 min−1. Langmuir adsorption isotherm fits gave R2 > 0.9 for both dyes with maximum adsorption capacities of 63.34 and 35.05 mg/g obtained MG and RB4 respectively. The thermodynamic parameters showed revealed spontaneous adsorption processes. The results indicated that the prepared Cs–CoFe2O4 is an efficient recyclable adsorbent for the MG and RB4 dye without losing the original activity and stability for water treatment applications. Keywords Chitosan · Cobaltferrite · Methylene green · Reactive blue 4 · Kinetics · Isotherms
1 Introduction Industries which include textile, paper and pulp, dye and dye intermediates, pharmaceutical, tannery, craft bleaching, food technology, cosmetics, etc. consume majority of tens of thousands of chemically different types of dyes that are currently manufactured. Their effluents are rich in dyes and other organic pollutants, when untreated dye effluents are released into aquatic environment, oxygen concentration in water body drastically decreases also the passage of light through water body is blocked with detrimental effect,
which can be harmful to both aquatic and terrestrial life by adversely affecting the natural ecosystem and causing longterm health effects [1]. However, dyes are more difficult to degrade after use because the producers and users are interested in stability and fastness [2], hence their persistence in the environment especially the ananthraquinone derivative, that are toxic and recalcitrant organo pollutants [3]. Elimination of dyes from aqueous coloured effluents in order to reduce their ecological consequences has attracted several physical, biological and chemical techniques. Adsorption has been the most common
Abideen Idow
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