Characterization and 2,4-D adsorption of sepiolite nanofibers modified by N-cetylpyridinium cations

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• 作者：Somayeh Bakhtiary ; Mehran Shirvani ; ^{shirvani@cc.iut.ac.ir} ; Hossein Shariatmadari
• 关键词：2 ; 4-Dichlorophenoxy acetic acid ; Sepiolite ; Surfactant ; Adsorption ; Organo-clay
• 刊名：Microporous and Mesoporous Materials
• 出版年：2013
• 出版时间：1 March, 2013
• 年：2013
• 卷：168
• 期：Complete
• 页码：30-36
• 全文大小：817 K

文摘

In this study, a novel N-cetylpyridinium (NCP)-modified sepiolite with the potential for the removal of organic contaminants from aqueous media was synthesized and the adsorptive removal of 2,4-D (2,4-Dichlorophenoxy acetic acid) herbicide by the natural and NCP-modified sepiolites was investigated. Maximum adsorption capacity of sepiolite for NCP surfactant was 240 mmol/kg, that is so much higher than the clay CEC. Fourier transformed infrared (FT-IR) spectroscopic studies revealed changes of sepiolite surface properties when this mineral was loaded with NCP, equal to the maximum adsorption capacity of the clay; however, X-ray diffraction (XRD) analysis and Scanning Electron Microscopy (SEM) showed almost no structural or morphological changes after NCP adsorption. The clay surface modification significantly improved 2,4-D removal from water. Sepiolite adsorption capacity for 2,4-D was increased with enhancing the surfactant loading, which was exceeded to the clay CEC. Therefore, the NCP-sepiolite could be efficiently applied for eliminating 2,4-D from polluted waters.