Removal of Chromium(VI) by Zero Valent Iron: Effects of Environmental Factors

Abstract:

The influences of various geochemical factors, such as pH, phosphate, bicarbonate, humic acid, permanganate, and dissolved oxygen, on hexavalent chromium(Cr(VI)) removal by zero-valent iron(Fe⁰) were investigated in a batch setting. Results showed that low pH environments were favorable to removal of Cr(VI) compared with high pH environments. Phosphate significantly inhibited removal of Cr(VI) possibly due to competition of adsorption sites on corrosion products. Humic acid introduced a marginal influence on Fe⁰ reactivity toward Cr(VI) reduction, whereas bicarbonate enhanced Cr(VI) removal by maintaining the solution pH near neutral. Permanganate cumbered the removal of Cr(VI) due to its competition for electron from oxidation of Fe⁰. The removal efficiency of Cr(VI) was higher in oxic conditions than that in anoxic conditions.

• Periodical: Advanced Materials Research (Volumes 356-360)
• Pages: 1093-1096
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.356-360.1093
• Online since: October 2011
• Authors: Pin Hua Rao, Wen Qi Zhang, Jie Zhao, Xin Yu Dong
• Keywords: Chromium (VI), Effect Factor, Zero-Valent Iron

References

[1] D. Mohan and C.U. Pittman Jr: J. Hazard. Mater. Vol. 142(2007), p.1

[2] T.Z. Liu, D.C.W. Tsang and I.M.C. Lo: Environ. Sci. Technol. Vol. 42(2008), p.(2092)

[3] D.W. Blowes, C.J. Ptacek and J.L. Jambor: Environ. Sci. Technol. Vol. 31(1997), p.3348

[4] A.R. Pratt, D.W. Blowes and C.J. Ptacek: Environ. Sci. Technol. Vol. 31(1997), p.2492

[5] P.H. Rao, M.S.H. Mak, T.Z. Liu, K.C.K. Lai and I.M.C. Lo: Chemosphere Vol.75(2009), p.156

[6] S. Gandhi, B.T. Oh, J.L. Schnoor, P.J.J. Alvarez: Water Res. Vol. 36(2002), p.(1973)