title: A novel conversion of the groundwater treatment sludge to magnetic particles for the adsorption of methylene blue.
abstract: Iron sludge, produced from filtration and backwash of groundwater treatment plant, has long been considered as a waste for landfill. In this study, iron sludge was reused to synthesize Fe3O4 magnetic particles (MPs) by using a novel solvothermal process. Iron sludge contained abundant amounts of silicon, iron, and aluminum and did not exhibit magnetic properties. After treatment for 4h, the amorphous Fe in iron sludge was transformed into magnetite Fe3O4, which could be easily separated from aqueous solution with a magnet. The prepared particles demonstrated the intrinsic properties of soft magnetic materials and could aggregate into a size of 1 μm. MPs treated for 10h exhibited excellent magnetic properties and a saturation magnetization value of 9 emu/g. The obtained particles presented the optimal adsorption of methylene blue under mild conditions, and the maximum adsorption capacity was 99.4 mg/g, which was higher than that of granular active carbon. The simple solvothermal method can be used to prepare Fe3O4 MPs from iron sludge, and the products could be applied to treatment of dyeing wastewater.
authors: School of Environment, Northeast Normal University, Changchun 130117, China; College of Water Conservancy and Environmental Engineering, Changchun Institute of Technology, Changchun130012, China.
authors: Suiyi
authors: S
authors: Zhu
authors: School of Environment, Northeast Normal University, Changchun 130117, China.
authors: Shuai
authors: S
authors: Fang
authors: School of Environment, Northeast Normal University, Changchun 130117, China.
authors: Mingxin
authors: M
authors: Huo
authors: School of Environment, Northeast Normal University, Changchun 130117, China.
authors: Yang
authors: Y
authors: Yu
authors: School of Environment, Northeast Normal University, Changchun 130117, China; Jilin Institute of Forestry Survey and Design, Changchun 130022, China.
authors: Yu
authors: Y
authors: Chen
authors: School of Environment, Northeast Normal University, Changchun 130117, China.
authors: Xia
authors: X
authors: Yang
authors: School of Environment, Northeast Normal University, Changchun 130117, China.
authors: Zhi
authors: Z
authors: Geng
authors: School of Environment, Northeast Normal University, Changchun 130117, China.
authors: Yi
authors: Y
authors: Wang
authors: School of Environment, Northeast Normal University, Changchun 130117, China; College of Water Conservancy and Environmental Engineering, Changchun Institute of Technology, Changchun130012, China.
authors: Dejun
authors: D
authors: Bian
authors: School of Environment, Northeast Normal University, Changchun 130117, China. Electronic address: huohl@nenu.edu.cn.
authors: Hongliang
authors: H
authors: Huo
mesh_terms: D000327:Adsorption; D060587:Groundwater; D008280:Magnetics; D008751:Methylene Blue / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D009584:Nitrogen / Q000737:chemistry; D056951:Photoelectron Spectroscopy; D012722:Sewage; D015204:Spectroscopy, Mossbauer; D014961:X-Ray Diffraction
chemical_list: D012722:Sewage; D009584:Nitrogen; D008751:Methylene Blue
keywords: Adsorption; Groundwater treatment; Iron sludge; Magnetic particles; Methylene blue; Solvothermal synthesize