Synthesis of a novel CoFe2O4/chitosan magnetic composite for fast adsorption of indigotine blue dye

Juliana M N Dos Santos; Carolina R Pereira; Luiz Antonio A Pinto; Tuanny Frantz; Éder C Lima; Edson L Foletto; Guilherme L Dotto

doi:10.1016/j.carbpol.2019.04.054

Synthesis of a novel CoFe₂O₄/chitosan magnetic composite for fast adsorption of indigotine blue dye

Carbohydr Polym. 2019 Aug 1:217:6-14. doi: 10.1016/j.carbpol.2019.04.054. Epub 2019 Apr 15.

Authors

Juliana M N Dos Santos¹, Carolina R Pereira², Luiz Antonio A Pinto³, Tuanny Frantz⁴, Éder C Lima⁵, Edson L Foletto⁶, Guilherme L Dotto⁷

Affiliations

¹ Chemical Engineering Department, Federal University of Santa Maria-UFSM, 1000 Roraima Avenue, 97105-900, Santa Maria, RS, Brazil. Electronic address: juhmnsantos@hotmail.com.
² Chemical Engineering Department, Federal University of Santa Maria-UFSM, 1000 Roraima Avenue, 97105-900, Santa Maria, RS, Brazil. Electronic address: carolinarathke@hotmail.com.
³ School of Chemistry and Food, Federal University of Rio Grande-FURG, KM 8 Itália Avenue, 96203-000, Rio Grande, RS, Brazil. Electronic address: dqmpinto@furg.br.
⁴ School of Chemistry and Food, Federal University of Rio Grande-FURG, KM 8 Itália Avenue, 96203-000, Rio Grande, RS, Brazil. Electronic address: tuanny.frantz@gmail.com.
⁵ Institute of Chemistry, Federal University of Rio Grande do Sul-UFRGS, 9500 Bento Gonçalves Avenue, Postal Box 15003, 91501-970, Porto Alegre, RS, Brazil. Electronic address: profederlima@gmail.com.
⁶ Chemical Engineering Department, Federal University of Santa Maria-UFSM, 1000 Roraima Avenue, 97105-900, Santa Maria, RS, Brazil. Electronic address: efoletto@gmail.com.
⁷ Chemical Engineering Department, Federal University of Santa Maria-UFSM, 1000 Roraima Avenue, 97105-900, Santa Maria, RS, Brazil. Electronic address: guilherme.dotto@ufsm.br.

PMID: 31079686
DOI: 10.1016/j.carbpol.2019.04.054

Abstract

A novel CoFe₂O₄/chitosan magnetic composite, where CoFe₂O₄ is known as cobalt ferrite, was synthetized, characterized and applied to adsorb indigotine blue dye (IBD). According to the central composite design (CCD), adsorption of IBD onto CoFe₂O₄/chitosan composite was favored when initial pH and adsorbent dosage were 3.0 and 0.75 g L^-1, respectively. Adsorption was a fast process, well represented by pseudo-first order model, being the equilibrium reached at 15 min. Concerning the equilibrium behavior, the adsorption was satisfactorily modeled by the Langmuir model, reaching maximum adsorption capacity of 380.88 mg g^-1 at 328 K. The thermodynamic parameters indicated a spontaneous, favorable and endothermic adsorption process. CoFe₂O₄/chitosan magnetic composite is an efficient adsorbent to remove dyes from aqueous media, presenting advantages like fast kinetic, high adsorption capacity and interesting magnetic properties that allows the easy separation after the adsorption operation.

Keywords: Adsorption; Crosslinking; Easy recovery; Indigotine blue; Magnetic chitosan.