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