By a News Reporter-Staff News Editor at Journal of Engineering -- Investigators discuss new findings in Chemical Engineering. According to news reporting out of Hefei, People's Republic of China, by VerticalNews editors, research stated, "Nanoscale zero-valent iron (nZVI) has been widely used in environmentally friendly removal of pollutants. The aggregation and passivation of nZVI particles decreased its efficiency during relatively long term usage."
Our news journalists obtained a quote from the research from the China University of Science and Technology, "Montmorillonite (MMT) supported nZVI has been demonstrated to increase the removal efficiency of Cr(VI) by researchers. However, the mechanism involving the dispersity of nZVI on surface and in interlayer of MMT is still unclear. Herein, we designed and prepared different nZVI materials, i.e., MMT-supported, ultrasound-assisted, starch-stabilized, and potassium-pretreated MMT-supported nZVI. The results of Cr removal experiments showed that the atomic efficiencies of Fe-0 are 0, 3.95%, 6.65%, 6.68%, and 10.71% for reductive iron, nZVI, nZVI/MMT, nZVI/K-MMT*, and nZVI/K-MMT in initial 5 min at pH 6.0, respectively, which means that the effect on Fe-0 efficiency is in the order of surface > interlayer > diffusion > mechanical dispersity. The results of Cr removal experiment revealed that the removal rates of Cr(VI) is intensively related with surface dispersity of nZVI."
According to the news editors, the research concluded: "The potassium-pretreated MMT (K-MMT) can significantly improve the dispersity of nZVI which should be attributed to ion exchange between K+ and Fe2+ and caused the intercalation of nZVI clusters."
For more information on this research see: The dispersity-dependent interaction between montmorillonite supported nZVI and Cr(VI) in aqueous solution. Chemical Engineering Journal, 2013;229():412-419. Chemical Engineering Journal can be contacted at: Elsevier Science Sa, PO Box 564, 1001 Lausanne, Switzerland. (Elsevier - www.elsevier.com; Chemical Engineering Journal - www.elsevier.com/wps/product/cws_home/601273)
Our news journalists report that additional information may be obtained by contacting Y.Y. Zhang, China University of Science & Technology, Dept. of Chem, Hefei 230036, People's Republic of China. Additional authors for this research include H. Jiang, Y. Zhang and J.F. Xie.
Keywords for this news article include: Asia, Hefei, Chemical Engineering, People's Republic of China
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