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    Please use this identifier to cite or link to this item: http://ir.cnu.edu.tw/handle/310902800/28656


    標題: Preparation of organobentonite by a novel semidry-method and its adsorption of 2,4-dichlorophenol from aqueous solution
    作者: Ruan, Xia
    Liu, Hong
    Chang, Chia-Yuan
    Fan, Xian-yuan
    貢獻者: 環境工程與科學系
    關鍵字: Adsorption
    2,4-Dichlorophenol
    Hexadecyltrimethylammonium
    Modifying
    Organobentonite
    日期: 2014-11
    上傳時間: 2015-05-06 21:24:05 (UTC+8)
    出版者: Elsevier Sci Ltd
    摘要: In this study, we report to prepare six modified inorganic mineral materials, including bentonite, attapulgite, montmorillonite, kaolinite and diatomite, in a novel semidry-method. Compared with traditional wet-method, this semidry-method requires fewer procedures and, thus, consumes shorter reaction time and less energy. In addition, the modified materials were found to have larger surfactant concentrations, which could result in higher removal efficiency to organic contaminants. Among these six materials, the modified bentonite (organobentonite) performed the best adsorption efficiency to 2,4-dichlorophenol (2,4-D) from aqueous solution and the removal efficiency reached 97.0%. Among four surfactants, hexadecyltrimethylammonium (HDTMA), a cationic and long hydrophobic tail surfactant, was found to be the most efficient modifier. Compared with raw bentonite, the removal efficiency of 2,4-D by HDTMA-modified bentonite (HDTMA-Bent) was enhanced up to more than 40%. The characterizations of raw bentonite and HDTMA-Bent indicated that there were smaller but more separated lamella in the HDTMA-Bent and the basal spacing could be enlarged by 128% as HDTMA inserting into the interlayers of bentonite. After being modified by HDTMA, the Zeta-potential of bentonite was transformed from negative to positive, and this variation of Zeta-potential was also consistent with the change of 2,4-D removal efficiency. (C) 2014 Elsevier Ltd. All rights reserved.
    關聯: International Biodeterioration & Biodegradation, v.95, pp.212-218
    Appears in Collections:[環境工程與科學系(所)] 期刊論文

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