期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 292, 期 -, 页码 173-179出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2015.03.028
关键词
Groundwater treatment; Iron sludge; Solvothermal synthesize; Magnetic particles; Adsorption; Methylene blue
资金
- National Natural Science Foundation of China (NSFC) [51378098, 51238001, 51408110, 51108069]
- Jilin Provincial Research Foundation [20130101038JC, 20140520151JH, 2014340]
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 4 h, 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 mu m. MPs treated for 10 h 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. (C) 2015 Published by Elsevier B.V.
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