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National Chung Hsing University Institutional Repository - NCHUIR > 農業暨自然資源學院 > 土壤環境科學系 > 依資料類型分類 > 期刊論文 >  Biosorption of Cr(VI) by coconut coir: Spectroscopic investigation on the reaction mechanism of Cr(VI) with lignocellulosic material

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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.;Wang, S.L.;Huang, S.T.;Tzou, Y.M.;Huang, J.H.
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
日期: 2010
Issue Date: 2012-12-07 14:47:08 (UTC+8)
關連: 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.
Relation: Journal of Hazardous Materials
Appears in Collections:[依資料類型分類] 期刊論文
[依教師分類] 鄒裕民
[依教師分類] 鄒裕民

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