Adsorption removal of methylene blue from aqueous solution on carbon-coated Fe3O4 microspheres functionalized with chloroacetic acid

• Published in: Science and engineering of composite materials Vol. 25; no. 2; pp. 353 - 361
• Main Authors: Zhang, Zefei, Kim, Cholhwan, Fernandez, Carlos, Sundaram, Manickam Minakshi, Ramakrishnappa, Thippeswamy, Wang, Yuhong, Wang, Linshan, Sun, Ting, Hu, Xiaomin
• Format: Journal Article
• Language: English
• Published: De Gruyter 28.03.2018
• Subjects: adsorption; carbon-coated Fe; carbon-coated fe3o4 nanoparticles; chloroacetic acid; methylene blue; nanoparticles
• ISSN: 0792-1233; 2191-0359
• DOI: 10.1515/secm-2016-0138

We report the preparation and employability of carbon-coated Fe (Fe /C) microspheres functionalized with chloroacetic acid (CAA) for the removal of methylene blue (MB) in aqueous solution. The prepared magnetic microspheres (Fe /C-CAA) were characterized by the following techniques: X-ray diffraction, transmission electron microscopy, Fourier-transform infrared spectrometer, vibrating sample magnetometry, and Brunauer-Emmett-Teller. The characterization results showed that Fe /C microspheres were modified by CAA without any phase change. Fe /C-CAA microspheres have higher adsorption capacity for MB compared to Fe /C microspheres. The Langmuir, Freundlich, and Temkin adsorption models were applied to describe the equilibrium isotherms, and the Langmuir adsorption model fitted well with the equilibrium data. The pseudo-first-order and pseudo-second-order kinetic models were used to describe the kinetics data. However, the pseudo-second-order kinetic model fitted better with the adsorption kinetics data.