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Effect of Solution pH on the Kinetic Adsorption of Methylene Blue by Sugarcane Bagasse Biochar Under a Magnetic Field


Affiliations
1 Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, China
 

Sugarcane bagasse, an agricultural waste biomass was used to prepare biochar by pyrolyzing the biomass under oxygen-limited conditions. The prepared biochar was used for the adsorptive removal of a cationic dye methylene blue (MB) under a magnetic field. It was found that the existence of the external magnetic field had significantly enhanced the uptake of MB onto the bagasse biochar. The increased biochar dosage actually declined the uptake of MB while the effect of the magnetic field was still significant. The adsorption kinetics was investigated under different solution pH conditions. The experimental data were simulated using non-linear pseudo-first-order, pseudo-second-order and Elovich kinetic models. The Elovich kinetic model was found to be more suitable to describe the adsorption kinetics. This indicates that the adsorption of MB onto BC400 is a chemisorption process in which the rate-determining step is diffusion in nature. The uptake of MB is mainly attributed to the π-π electron-donor-acceptor interaction and electrostatic attraction.

Keywords

Biochar, Methylene Blue, Adsorption Kinetics, Bagasse, Magnetic Field.
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  • Effect of Solution pH on the Kinetic Adsorption of Methylene Blue by Sugarcane Bagasse Biochar Under a Magnetic Field

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Authors

Xiao Mi
Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, China
Yujie Guo
Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, China
Chunyu Zhang
Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, China
Li Wang
Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, China
Shen Zhang
Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, China
Bobo Zou
Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, China
Zejie Wang
Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, China
Guoting Li
Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, China

Abstract


Sugarcane bagasse, an agricultural waste biomass was used to prepare biochar by pyrolyzing the biomass under oxygen-limited conditions. The prepared biochar was used for the adsorptive removal of a cationic dye methylene blue (MB) under a magnetic field. It was found that the existence of the external magnetic field had significantly enhanced the uptake of MB onto the bagasse biochar. The increased biochar dosage actually declined the uptake of MB while the effect of the magnetic field was still significant. The adsorption kinetics was investigated under different solution pH conditions. The experimental data were simulated using non-linear pseudo-first-order, pseudo-second-order and Elovich kinetic models. The Elovich kinetic model was found to be more suitable to describe the adsorption kinetics. This indicates that the adsorption of MB onto BC400 is a chemisorption process in which the rate-determining step is diffusion in nature. The uptake of MB is mainly attributed to the π-π electron-donor-acceptor interaction and electrostatic attraction.

Keywords


Biochar, Methylene Blue, Adsorption Kinetics, Bagasse, Magnetic Field.

References