title: Effect of a magnetic field on the adsorptive removal of methylene blue onto wheat straw biochar.
abstract: Biochar pyrolyzed from wheat straw was innovatively used for the adsorptive removal of cationic dye methylene blue through exposure to a magnetic field. The adsorption capability of the biochar pyrolyzed at 200 °C exceeded that of samples pyrolyzed at higher temperatures. The surface acidic functional groups of wheat straw biochar were deduced to be more sensitive to the effects of the external magnetic field. The enhancement of the magnetic field achieved by increases in the initial dye concentration, and a decrease in the biochar dosage and solution pH, were more significant compared with those caused by other conditions. Kinetic experiments indicated that chemisorption occurred during adsorption. The qmax values for dye adsorption without, and with, an external magnetic field were found to be 46.6 and 62.5mg/g, respectively. These demonstrated that wheat straw biochar could be used for the efficient adsorption of pollutants when assisted by an external magnetic field.
authors: Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, China. Electronic address: lipsonny@163.com.
authors: Guoting
authors: G
authors: Li
authors: Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, China.
authors: Weiyong
authors: W
authors: Zhu
authors: Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, China.
authors: Chunyu
authors: C
authors: Zhang
authors: Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, China.
authors: Shen
authors: S
authors: Zhang
authors: Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, China.
authors: Lili
authors: L
authors: Liu
authors: Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, China.
authors: Lingfeng
authors: L
authors: Zhu
authors: School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China.
authors: Weigao
authors: W
authors: Zhao
mesh_terms: D000327:Adsorption; D002606:Charcoal / Q000737:chemistry*; D006358:Hot Temperature; D007700:Kinetics; D060526:Magnetic Fields; D008751:Methylene Blue / Q000302:isolation & purification*; D014908:Triticum; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D014874:Water Pollutants, Chemical; C540010:biochar; D002606:Charcoal; D008751:Methylene Blue
keywords: Adsorption; Biochar; Magnetic field; Methylene blue