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Title: Comparative study of CoFe2O4 nanoparticles and CoFe2O4-chitosan composite for Congo Red and Methyl Orange removal by adsorption
Authors: Simionescu, Claudia Maria 
Tatarus, Alina 
Culita, Daniela Cristina 
Stanica, Nicolae 
Ionescu, Ioana 
Butoi, Bogdan 
Banici, Ana Maria 
Affiliations: University Politehnica of Bucharest, Romania 
National Research and Development Institute for Industrial Ecology, ECOIND 
Institute of Physical Chemistry Ilie Murgulescu 
Institute of Physical Chemistry Ilie Murgulescu 
National Research and Development Institute for Industrial Ecology, ECOIND 
National Institute for Laser, Plasma and Radiation Physics 
National Institute for Laser, Plasma and Radiation Physics 
Keywords: Dye adsorption;Congo Red;Methyl Orange;Magnetic adsorbents;Isothermal study;Kinetic study
Issue Date: Mar-2021
Publisher: MDPI
(1) Background: A comparative research study to remove Congo Red (CR) and Methyl Orange (MO) from single and binary solutions by adsorption onto cobalt ferrite (CoFe2O4) and cobalt ferrite–chitosan composite (CoFe2O4-Chit) prepared by a simple coprecipitation method has been performed. (2) Methods: Structural, textural, morphology, and magnetic properties of the obtained magnetic materials were examined by X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, N2 adsorption-desorption analysis, Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), and magnetic measurements. The optimal operating conditions of the CR and MO removal processes were established in batch experiments. The mathematical models used to describe the processes at equilibrium were Freundlich and Langmuir adsorption
isotherms. (3) Results: Cobalt ferrite–chitosan composite has a lower specific surface area (SBET) and consequently a lower adsorption capacity than cobalt ferrite. CoFe2O4 and CoFe2O4–Chit particles exhibited a superparamagnetic behavior which enabled their efficient magnetic separation after the adsorption process. The research indicates that CR and MO adsorption onto prepared magnetic materials takes place as monolayer onto a homogeneous surface. According to the Langmuir isotherm model that best fits the experimental data, the maximum CR/MO adsorption capacity is 162.68/94.46 mg/g for CoFe2O4 and 15.60/66.18 mg/g for CoFe2O4–Chit in single solutions. The results of the kinetics study revealed that in single-component solutions, both pseudo-first-order and pseudo-second-order kinetics models represent well the adsorption process of CR/MO on both magnetic adsorbents. In binary solutions, adsorption of CR/MO on CoFe2O4 better follows the
pseudo-second-order kinetics model, while the kinetic of CR/MO adsorption on CoFe2O4–Chit is similar to that of the dyes in single-component solutions. Acetone and ethanol were successfully used as desorbing agents. (4) Conclusions: Our study revealed that CoFe2O4 and CoFe2O4–Chit particles are good candidates for dye-contaminated wastewater remediation.
Nanomaterials, 2021, vol. 11, no. 3, 711,
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