TY - JOUR
T1 - Magnetic chitosan microspheres for the removal of methyl violet 2B from aqueous solutions
AU - Torezan, Luciane
AU - Bortoluz, Jordana
AU - Guerra, Nayrim Brizuela
AU - Ferrarini, Fabrício
AU - Bonetto, Luis Rafael
AU - da Silva Teixeira, Cristiano
AU - da Silva Crespo, Janaina
AU - Giovanela, Marcelo
AU - Carli, Larissa Nardini
N1 - Publisher Copyright:
© 2021 Taylor & Francis Group, LLC.
PY - 2023
Y1 - 2023
N2 - This work aimed to evaluate the adsorption capacity of magnetic chitosan microspheres for the removal of methyl violet (MV) 2B dye. For this purpose, magnetite was prepared by chemical precipitation of iron salts in alkaline medium and incorporated to chitosan microspheres which were obtained by the suspension cross-linking technique. The influence of the experimental parameters, such as adsorbent dosage (0.05 to 0.25 g), stirring frequency (100 to 800 rpm), pH (2.0 to 12.0), initial dye concentration (30 to 90 mg L−1), and contact time (5 to 480 min), as well as the equilibrium, kinetics and thermodynamics were also evaluated. Furthermore, five isotherm models and three kinetic models were tested to analyze the experimental data. The results evidenced that the equilibrium was better described by the Langmuir isotherm (qm = 128.84 mg g−1), although the statistical Fisher's test showed that other models could also be applied to describe the experimental results. Kinetics studies showed that the adsorption followed the pseudo-second order model with a significant difference between the tested models and that the adsorption process involves more than one sorption rate. It was also found that the adsorption of MV 2B dye onto magnetic chitosan microspheres was an exothermic (ΔH°ads = −1.70 kJ mol−1) and spontaneous (ΔG°ads = −3.96 kJ mol−1) process. Finally, it can be concluded that the magnetic chitosan microspheres constituted an efficient and inexpensive material for the removal of the MV 2B dye from aqueous solutions.
AB - This work aimed to evaluate the adsorption capacity of magnetic chitosan microspheres for the removal of methyl violet (MV) 2B dye. For this purpose, magnetite was prepared by chemical precipitation of iron salts in alkaline medium and incorporated to chitosan microspheres which were obtained by the suspension cross-linking technique. The influence of the experimental parameters, such as adsorbent dosage (0.05 to 0.25 g), stirring frequency (100 to 800 rpm), pH (2.0 to 12.0), initial dye concentration (30 to 90 mg L−1), and contact time (5 to 480 min), as well as the equilibrium, kinetics and thermodynamics were also evaluated. Furthermore, five isotherm models and three kinetic models were tested to analyze the experimental data. The results evidenced that the equilibrium was better described by the Langmuir isotherm (qm = 128.84 mg g−1), although the statistical Fisher's test showed that other models could also be applied to describe the experimental results. Kinetics studies showed that the adsorption followed the pseudo-second order model with a significant difference between the tested models and that the adsorption process involves more than one sorption rate. It was also found that the adsorption of MV 2B dye onto magnetic chitosan microspheres was an exothermic (ΔH°ads = −1.70 kJ mol−1) and spontaneous (ΔG°ads = −3.96 kJ mol−1) process. Finally, it can be concluded that the magnetic chitosan microspheres constituted an efficient and inexpensive material for the removal of the MV 2B dye from aqueous solutions.
KW - adsorption
KW - chitosan
KW - magnetite
KW - methyl violet 2B dye
KW - wastewater treatment
UR - http://www.scopus.com/inward/record.url?scp=85121100144&partnerID=8YFLogxK
U2 - 10.1080/01932691.2021.2008420
DO - 10.1080/01932691.2021.2008420
M3 - Article
AN - SCOPUS:85121100144
SN - 0193-2691
VL - 44
SP - 1170
EP - 1182
JO - Journal of Dispersion Science and Technology
JF - Journal of Dispersion Science and Technology
IS - 7
ER -