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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 >  The adsorption and catalytic transformations of chromium on Mn substituted goethite

Please use this identifier to cite or link to this item: http://nchuir.lib.nchu.edu.tw/handle/309270000/128398

標題: The adsorption and catalytic transformations of chromium on Mn substituted goethite
作者: Wu, W.C.;Wang, S.L.;Tzou, Y.M.;Chen, J.H.;Wang, M.K.
關鍵字: chromium;Mn-substituted goethite;oxidation reaction;photo-reduction;reaction;hexavalent chromium;photocatalytic reduction;synthetic goethite;cr(vi) reduction;oxidation;manganese;soils;acid;kinetics;system
日期: 2007
Issue Date: 2012-12-07 14:47:14 (UTC+8)
關連: Applied Catalysis B-Environmental, Volume 75, Issue 3-4, Page(s) 272-280.
摘要: Goethite widely occurs in the environment and its role in photoreduction of toxic Cr(VI) to less toxic Cr(III) has been previously reported in the literature. However, natural goethite is rarely stoichiometric and usually contains certain substitutional cations, such as Mn(III) or Mn(IV), which, on the other hand. is an oxidant for Cr(III). In order to provide more insight into the fate of Cr(VI) in the environment, the influence of Mn-substitution in goethite on its Cr(VI) photoreduction capability needs to be clarified. The objectives of this study were to evaluate the adsorption and photo-transformations of Cr on Mn-substituted goethite with Mn/(Mn + Fe) molar ratios ranging from 0 to 0.1. The results showed that Cr adsorption and photo-catalytic transformation on goethite were strongly influenced by the Mn content of goethite. When the system was under illumination. Cr(VI) reduction was decreased with increasing Mn-substitution in goethite. The re-oxidation of photo-reduced product, i.e., Cr(III), at the Mn sites on the surface of goethite is responsible for the lower Cr(VI) photo-reduction capacity of Mn-substituted goethite. The role of goethite in the reduction of Cr(VI) may be overestimated unless its Mn-substituted counterparts are considered. The effectiveness of Mn sites in to increase toxic Cr(VI) has important implications in determining the fate and threat of Cr(VI) contamination. (c) 2007 Elsevier B.V. All rights reserved.
Relation: Applied Catalysis B-Environmental
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] 陳仁炫
[依教師分類] 鄒裕民

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