HDTMA改性蒙脱土对苯酚的吸附及机理研究

利用十六烷基三甲基溴化铵(HDTMA)改性蒙脱土处理含酚废水．了解不同改性量有机蒙脱土吸附苯酚的能力。结果表明．改性蒙脱土按照分配机理吸附苯酚．改性蒙脱土改性量高和水溶液中苯酚浓度高．其吸跗的苯酚数量大。1．0CEC(阳离子交换容量)改性蒙脱土对水溶液中苯酚去除率达到76％。改性蒙脱土中有机物对苯酚的吸附存在协同作用．因此．改性蒙脱土吸附苯酚的增加速率要超过其中HDTMA增加的速率。在试验的苯酚浓度下．改性蒙脱土对苯酚吸附符合Freundlich吸附模式．不符合Langmuir吸附模式。

Study on Adsorption of Phenol to HDTMA-modified Montmorillonite and its Mechanism

In order to probe the adsorptive capacity of modified montmorillonite, a natural montmorillonite has been modified with different amounts of hexadeeyltrimethylammonium(HDTMA)according to its cation exchange capacity(CEC), and was used to treat phenolic wastewater. The results of experiments showed that modified montmorillonite could sorb phenol according with partition. Amounts of phenol adsorbed to modified montmorillonite were larger if amounts of HDTMA exchanged in montmorillonite and the initial phenol concentration were higher. The removal rate of phenol was 76% through adsorption of l.OCEC modified montmorillonite. The cooperation of organic matters in modified montmorillonite could enhance its adsorptive capacity for phenol. The adsorption of phenol to modified montmorillonite could be well described by Freudlich model instead of Langmuir model.