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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 >  Adsorption and thermal desorption of Cr(VI) on Li/Al layered double hydroxide

Please use this identifier to cite or link to this item: http://nchuir.lib.nchu.edu.tw/handle/309270000/128400

標題: Adsorption and thermal desorption of Cr(VI) on Li/Al layered double hydroxide
作者: Wang, S.L.;Hseu, R.J.;Chang, R.R.;Chiang, P.N.;Chen, J.H.;Tzou, Y.M.
關鍵字: Li/Al LDH;Cr(VI);adsorption;deintercalation;thermal desorption;anion-exchange intercalation;x-ray-diffraction;chemistry;hydrotalcites;chromium(vi);reduction;removal;ions;clay;salt
日期: 2006
Issue Date: 2012-12-07 14:47:17 (UTC+8)
關連: Colloids and Surfaces a-Physicochemical and Engineering Aspects, Volume 277, Issue 1-3, Page(s) 8-14.
摘要: Li/Al layered double hydroxide (Li/Al LDH), known as anionic clay, comprises positive charges, which are counter-balanced by interlayer anions. The material is capable of adsorbing anions through ion-exchange reaction. This property of LDH leads to its potential application in scavenging anionic contaminants, such as Cr(VI) in the waste streams. In this study, the adsorption of Cr(VI) by Li/Al LDH was investigated at 10 and 30 degrees C. The results showed that Cr(VI) adsorption was relatively rapid; however, a portion of adsorbed Cr(VI) was released over the reaction time and the releasing rate was dependent on reaction temperature. Particularly at 30 degrees C as high as 80.1% of adsorbed Cr(VI) was released after 24 h reaction. The release of adsorbed Cr(VI) is due to the deintercalation of Li+ from Li/Al LDH structures in aqueous Solution and gibbsite, which wits used as the precursor to synthesize Li/Al LDH, was the product of the deintercalation reaction. The Li deintercalation reaction of Li/Al LDH and its dependence on temperature may be utilized to develop a method of treating Cr(VI)-containing wastes and recovering Cr(VI). That is, Li/Al LDH can be used as an adsorbent to remove Cr(VI) in wastewater. Then the Cr(VI)-bearing LDH particles are collected and re-suspended in hot water to enhance Li deintercalation and Cr(VI) desorption. Consequently Cr(VI) can be recovered from the solution and the solid product, i.e., gibbsite, can be recycled for further uses. (c) 2005 Elsevier B.V. All rights reserved.
Relation: Colloids and Surfaces a-Physicochemical and Engineering Aspects
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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