双阳离子有机膨润土对菲的吸附性能及机理研究
SORPTION PROPERTIES AND MECHANISMS OF PHENANTHRENE TO DUAL-CATION ORGANOBENTONITES
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摘要: 用长碳链季铵盐溴化十六烷基三甲铵(CTMAB)与短碳链阳离子表面活性剂(TMAB)按不同配比改性膨润土,制得一系列双阳离子有机膨润土.研究了双阳离子有机膨润土吸附水中菲的适宜条件、性能及机理.结果表明,双阳离子有机膨润土的层间距、有机碳含量及对菲的吸附性能与改性时表面活性剂的加入量成正相关;菲的等温吸附曲线呈线性,是菲在水-双阳离子有机膨润土之间分配作用的结果.Abstract: A series of dual-cation organobentonites are synthesized by replacing the metal ions in bentonite with both cetyltrimethylammonium (CTMA) and tetramethylammonium cation (TMA). The optimal conditions, properties for dual-cation organobentonites to sorb phenanthrene from water are investigated. The interlayer spacing and organic carbons contents of organobentonites, and the sorption of phenanthrene to organobentonites are relative to the amount and akly-length of organic cation exchanging into the bentonite. The sorption of phenanthrene to dual-cation organobentonites is also related to the properties of organic compound. The sorption isotherm of phenanthrene is linear, which is the result of phenanthrene partition into dual-cation organobentonites.
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Key words:
- bentonite /
- cation surfactants /
- phenanthrene /
- sorption /
- wastewater treatment
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