Design and Preparation of Chitosan-Crosslinked Bismuth Ferrite/Biochar Coupled Magnetic Material for Methylene Blue Removal

Xiaoxi Cai, Jiang Li, Yunguo Liu, Xinjiang Hu, Xiaofei Tan, Shaobo Liu, Hui Wang, Yanling Gu and Lerong Luo
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Xiaoxi Cai: College of Art and Design, Hunan First Normal University, Changsha 410205, China
Jiang Li: School of Architecture and Art, Central South University, Changsha 410083, China
Yunguo Liu: College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
Xinjiang Hu: College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
Xiaofei Tan: College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
Shaobo Liu: School of Architecture and Art, Central South University, Changsha 410083, China
Hui Wang: College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
Yanling Gu: College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha 410114, China
Lerong Luo: College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China

IJERPH, 2019, vol. 17, issue 1, 1-19

Abstract: Biochar obtained by pyrolysis of the fiber plant kenaf was mixed with bismuth ferrite (BiFeO 3 ) in a chitosan-containing acetic acid solution, magnetized, and modified to prepare a chitosan-crosslinked BiFeO 3 /biochar coupled magnetic material. The adsorption properties of the composite were investigated using methylene blue dissolved in water, and the effects of external conditions, such as pH, methylene blue concentration, reaction time, and temperature, on the adsorption performance were studied. The adsorption data were fitted and analyzed with kinetic and isotherm models, and the results showed that the BiFeO 3 /biochar coupled magnetic material effectively adsorbed methylene blue. The amounts adsorbed onto this magnetic material increased with increasing initial methylene blue concentration, reaction time, and temperature, and the adsorption performance improved under neutral and alkaline conditions. The pseudo-first-order kinetic and Langmuir isotherm models satisfactorily fitted the adsorption data, showing that the adsorption of methylene blue involved both chemical and physical adsorption. The maximum adsorption capacity of methylene blue onto the BiFeO 3 /biochar coupled magnetic material reached 18.942 mg·g −1 at 25 °C, confirming the excellent dye binding activity of this material.

Keywords: biochar; magnetic; composite; adsorption; methylene blue (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2019
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