Flash fixation of heavy metals from two industrial wastes into ferrite by microwave hydrothermal co-treatment

Chen, Dan, Mei, Chun-Yan, Yao, Li-Hua, Jin, Hong-Ming, Qian, Guang-Ren and Xu, Zhi-Ping (2011) Flash fixation of heavy metals from two industrial wastes into ferrite by microwave hydrothermal co-treatment. Journal of Hazardous Materials, 192 3: 1675-1682. doi:10.1016/j.jhazmat.2011.06.091


Author Chen, Dan
Mei, Chun-Yan
Yao, Li-Hua
Jin, Hong-Ming
Qian, Guang-Ren
Xu, Zhi-Ping
Title Flash fixation of heavy metals from two industrial wastes into ferrite by microwave hydrothermal co-treatment
Journal name Journal of Hazardous Materials   Check publisher's open access policy
ISSN 0304-3894
1873-3336
Publication date 2011-09-15
Sub-type Article (original research)
DOI 10.1016/j.jhazmat.2011.06.091
Volume 192
Issue 3
Start page 1675
End page 1682
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2012
Language eng
Formatted abstract
Flash fixation of heavy metals from electroplating wastewater (EPW) and pickling waste liquor (PWL) into ferrite lattice can be investigated by microwave hydrothermal process. The toxicity of wastewater may be reduced by the redox reaction between Cr(VI) in electroplating wastewater and Fe(II) in pickling waste liquor. Box–Behnken design (BBD) experiment gives optimal process condition of ferrite formation as follows: wastewater volume ratio (VPWL:VEPW = 0.20), pH value 11 and retention time 15 min, on which formed ferrite has a soft magnetic property with high saturation magnetization (Ms) 47.4 emu/g. The rapid ferrite process has lower activation energy 7.01 kJ/mol according to grain growth kinetics. Concerning the environmental and economy, we introduced a new and interesting method for water remediation simultaneously synthesizing ferrite by using microwave mediated hydrothermal processes.

Highlights: ► Valuable ferrite materials can be prepared by co-treating pickling waste liquor and electroplating wastewater. ► Toxic Cr(VI) in electroplating wastewater can be reduced to Cr(III) by utilizing the reducibility of Fe(II) in pickling waste liquor. ► Fast-heating provided by microwave hydrothermal process can be a cost-effective way compared with those high energy consumed methods. ► Heavy metals Zn and Cr in the ferrite lattice are chemically stable.
Keyword Electroplating wastewater
Pickling waste liquor
Microwave hydrothermal process
Heavy metal
Ferrite
Magnetic-properties
Annealing temperature
Electroplating waste
Pickle liquor
Grain-size
Optimization
Reduction
Acid
Microstructure
Extraction
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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