Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 120, Issue -, Pages 186-190Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2013.10.009
Keywords
Electroplating wastewaters; Pickle acid liquor; Layered double hydroxide (LDH); Magnetic nanomaterials
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Funding
- National Nature Science Foundation of China [20677037, 20877053, 21107067, 51174132]
- Shanghai Leading Academic Discipline Project [S30109]
- Australian Research Council for the ARC Centre of Excellence for Functional Nanomaterials and ARC Discovery Project [DP0870769]
- Shanghai Tongji Gao Tingyao Environmental Science & Technology Development Foundation
- China Scholarship Council
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CN- has been widely used in electroplating and mining, generating a vast amount of CN-containing heavy-metal wastewaters. In this research paper, we present a strategy to recycle these cyanide-containing electroplating wastewaters (Ni, Zn, Cr and Fe) with pickle acid liquors (Fe) and produce magnetic nanomaterials. The process includes formation of layered double hydroxides (LDH) as the intermediates and their conversion to valuable magnetic materials. LDH intermediates were first precipitated from these two wastewaters and then thermally converted into superparamagnetic mixed oxide nanomaterials, with the crystallite size of 10-25 nm and the saturation magnetization up to 40 emu/g. Specifically, during the conversion, secondary pollution resulting from CN- was significantly reduced. This research thus demonstrates a cost-effective and safe way to treat CN-containing wastewaters and transfer to useful nanomaterials. (C) 2013 Elsevier B.V. All rights reserved.
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