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http://dx.doi.org/10.12925/jkocs.2016.33.3.441

A Study on the Treatment of Heavy Metal in Wastewater by Redox Reaction of Cu-Zn Metal Alloy and Adsorption reaction of Al-Silicate  

Lee, Soo-Jeong (Department of Chemical Engineering, Changwon National University)
Kim, Jong Hwa (Department of Chemical Engineering, Changwon National University)
Song, Ju Yeong (Department of Chemical Engineering, Changwon National University)
Publication Information
Journal of the Korean Applied Science and Technology / v.33, no.3, 2016 , pp. 441-448 More about this Journal
Abstract
Heavy metal removal study is conducted from synthetic waste water by reduction and oxidation(redox) reaction of Cu-Zn metal alloy and adsorption reaction of aluminium silicate. Heavy metal whose ionization tendency is smaller than zinc are reducted in an aqueous solution, and the concentration of ionized zinc is reduced by adsorption reaction. The average diameter of metal alloy micro fiber is about $200{\mu}m$, and the surface area is wide enough to get equilibrium in a single cycle treatment. A single cycle treatment of redox reaction of Cu-Zn metal alloy, could remove 100.0 % of Cr(III), 98.0 % of Hg, 92.0 % of Sn and 91.4 % of Cu respectively. An ionization tendency of chromium is very close to zinc, but removal efficiency of chromium by redox reaction is significant. This result shows that trivalent chromium ion is expected to generate hydroxide precipitation with $OH^-$ ion generated by redox reaction. Zinc ion generated by redox reaction is readily removed by adsorption reaction of aluminium silicate in a single cycle treatment. Other heavy metal components which are not perfectly removed by redox reaction also showed very high removal efficiency of 98.0 % or more by adsorption reaction. Aluminium ion is not increased by adsorption reaction of aluminium silicate. That means heavy metal ion removal mechanism by adsorption reaction is turned out to be not an ion exchange reaction, but an adsorption reaction.
Keywords
Redox; Heavy metal treatment; Adsorption reaction; Cu-Zn; Aluminium silicate;
Citations & Related Records
Times Cited By KSCI : 10  (Citation Analysis)
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