In:
E-Journal of Chemistry, Hindawi Limited, Vol. 9, No. 4 ( 2012), p. 2429-2438
Abstract:
This paper presents the synthesis of penta-bismuth hepta-oxide nitrate, Bi 5 O 7 NO 3 , via the chemical precipitation method. After calcination, the precipitate was characterised by several methods, which included X-ray powder diffraction, X-ray photoelectron spectroscopy, scanning and transmission electron microscopy, Fourier transform infrared, thermogravimetric analysis, BET surface area and pH drift method to determine the pH of point of zero charge (pH pzc ). The study results revealed that Bi 5 O 7 NO 3 had an orthorhombic crystal structure, a surface area of 1.6 m2 g-1 and a point of zero charge at pH 9.7. The chemical state of Bi 5 O 7 NO 3 indicated the presence of three oxidation states of bismuth centre. Furthermore, the decolourization ability of Bi 5 O 7 NO 3 to remove the azo dye was also evaluated. Although it had lower surface area, the removal efficiency was extremely good. This finding suggests that Bi 5 O 7 NO 3 could be used as a promising adsorbent for azo dye removal. The XPS spectra showed that the accumulation of dye onto Bi 5 O 7 NO 3 could be due to the anion exchange process, suggesting the birth of a new anion exchanger for azo dye removal.
Type of Medium:
Online Resource
ISSN:
0973-4945
,
2090-9810
Language:
English
Publisher:
Hindawi Limited
Publication Date:
2012
detail.hit.zdb_id:
2393625-3
detail.hit.zdb_id:
2703077-5
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