Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/44621
標題: Biosorption of Cr(VI) by coconut coir: Spectroscopic investigation on the reaction mechanism of Cr(VI) with lignocellulosic material
作者: Shen, Y.S.
王尚禮
Wang, S.L.
Huang, S.T.
Tzou, Y.M.
Huang, J.H.
鄒裕民
關鍵字: Lignocellulose
Hexavalent chromium
Reduction
Sorption
Trivalent
chromium
Surface precipitation
x-ray-absorption
near-edge structure
2p photoelectron-spectra
low-cost adsorbents
hexavalent chromium
waste-water
agricultural
waste
aqueous-solutions
heavy-metals
removal
期刊/報告no:: Journal of Hazardous Materials, Volume 179, Issue 1-3, Page(s) 160-165.
摘要: In this study, the removal mechanism of Cr(VI) from water by coconut coir (CC) was investigated using Xray photoelectron spectroscopy (XPS), Cr K-edge X-ray absorption near edge structure (XANES) and FTIR spectroscopy. The results showed that, upon reaction with CC at pH 3, Cr(VI) was reduced to Cr(III), which was either bound to CC or released back into solution. As revealed by the FTIR spectra of CC before and after reacting with Cr(VI), the phenolic methoxyl and hydroxyl groups of lignin in CC are the dominant drivers of Cr(VI) reduction, giving rise to carbonyl and carboxyl groups on CC. These functional groups can subsequently provide binding sites for Cr(III) resulting from Cr(VI) reduction. In conjunction with forming complexes with carbonyl and carboxyl groups, the formation of Cr(III) hydroxide precipitate could also readily occur as revealed by the linear combination fitting of the Cr K-edge XANES spectrum using a set of reference compounds. The phenolic groups in lignin are responsible for initiating Cr(VI) reduction, so lignocellulosic materials containing a higher amount of phenolic groups are expected to be more effective scavengers for removal of Cr(VI) from the environment. (C) 2010 Elsevier B.V. All rights reserved.
URI: http://hdl.handle.net/11455/44621
ISSN: 0304-3894
文章連結: http://dx.doi.org/10.1016/j.jhazmat.2010.02.073
Appears in Collections:土壤環境科學系

文件中的檔案:

取得全文請前往華藝線上圖書館



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.