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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472
EISSN: 1735-2630
Vol. 12, No. 5, 2015, pp. 1603-1612
Bioline Code: st15149
Full paper language: English
Document type: Research Article
Document available free of charge

International Journal of Environment Science and Technology, Vol. 12, No. 5, 2015, pp. 1603-1612

 en Synthesis of agar-stabilized nanoscale zero-valent iron particles and removal study of hexavalent chromium
Jiao, C.; Cheng, Y.; Fan, W. & Li, J.

Abstract

In this study, agar-stabilized nanoscale zerovalent iron (A-nZVI) was synthesized using a rheological phase reaction method. The structure and morphology of A-nZVI particles were investigated by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy and Fourier-transform infrared spectrometry. Batch removal experiments showed that the pH value of solution, hexavalent chromium [Cr(VI)]/A-nZVI mass ratio and reaction time have significant effects on the removal of Cr(VI). A 100 % removal of Cr(VI) was achieved when applying 50 mg L-1 of Cr(VI) at the optimal pH value of 3 and the Cr(VI)/A-nZVI molar ratio of 0.025 with the reaction time of 2 h at room temperature. The removal rates of Cr(VI) were fitted to the modified pseudo-first-order kinetic equations with respect to Cr(VI) concentrations.

Keywords
Agar-stabilized nanoscale zero-valent iron; Rheological phase reaction; Hexavalent chromium; Removal efficiency

 
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