X-ray absorption spectroscopy study of chromium recovered from Cr(VI)-containing water with rice husk?

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Title:	X-ray absorption spectroscopy study of chromium recovered from Cr(VI)-containing water with rice husk?
Authors:	Hu, M.-J., Wei, Y.-L., Yang, Y.-W., Lee, J.-F.
Contributors:	Department of Environmental Science and Engineering, Tunghai University
Keywords:	Aliphatics;Rice husk;X-ray absorption spectroscopy
Date:	2004-08-25
Issue Date:	2013-05-15T09:02:43Z (UTC)
Abstract:	The characteristics of the richness in silica and the high porosity of rice husk enable its application as a good, yet cheap, heavy metal adsorbent from wastewater. This study used rice husk to sorb Cr(VI) from wastewater that contained 2000 mg Cr(VI) 1-1. Results of a scanning electron microscopy (SEM) experiment indicate a considerable morphology alteration of the rice husk after the sorption experiments. 13C-nuclear magnetic resonance (NMR) measurements show significant decrease in intensity of all the following peaks: carbonylic, carboxylic, aromatic, polysaccharides, carbohydrates and aliphatics. The X-ray absorption near edge structure (XANES) result indicates that about 70% and 90% of the Cr(VI) sorbed on the rice husk after the 12 and 48 h sorption experiments, respectively, were in Cr(III) forms. In the 12 h sorbed rice husk sample, the chromium species distribution is 41% organic Cr(III) + 27%Cr(OH)3 + 32%CrO3, while in the 48 h sorbed one, it is 57% organic Cr(III) + 31%Cr(OH)3 + 12%CrO 3.
Relation:	Journal of Physics Condensed Matter 16 (33) , pp. S3473-S3478
Appears in Collections:	[環境科學與工程學系所] 會議論文

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