Modification of a Na-montmorillonite with quaternary ammonium salts and its application for organics removal from TNT red water.
Modification of a Na-montmorillonite with quaternary ammonium salts and its application for organics removal from TNT red water.
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DOI：
10.2166/wst.2014.039
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发表时间：
2014-01
期刊：
影响因子：
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通讯作者：
Qian Zhang;Zilin Meng;Yihe Zhang;Guocheng Lv;Fengzhu Lv;Limei Wu
中科院分区：
文献类型：
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作者：
Qian Zhang;Zilin Meng;Yihe Zhang;Guocheng Lv;Fengzhu Lv;Limei Wu
制备了钠基蒙脱土（Na-Mont）、十六烷基三甲基溴化铵改性蒙脱土（CTAB-Mont）和四甲基溴化铵改性蒙脱土（TMAB-Mont）作为吸附剂，用于去除TNT红水中的有机污染物。用X射线衍射和傅里叶变换红外光谱对样品进行了表征。CTAB-Mont的吸附容量（15.9 mg/g）远大于Na-Mont（0.26 mg/g）和TMAB-Mont（1.7 mg/g）。Langmuir吸附等温线和准二级动力学模型与实验结果吻合较好。CTAB-Mont层间的分布相是促进吸附的主要因素。分子模拟分析的分子排列与实验数据一致，支持吸附机理。
Na-montmorillonite (Na-Mont) and organic montmorillonite modified by cetyltrimethylammonium bromide (CTAB-Mont) and tetramethylammonium bromide (TMAB-Mont) were prepared as adsorbents to remove organic contaminants from 2,4,6-trinitrotoluene (TNT) red water. The characterizations of the samples were performed with X-ray diffraction and Fourier transform infrared spectroscopy. The adsorption capacity of CTAB-Mont (15.9 mg/g) was much larger than Na-Mont (0.26 mg/g) and TMAB-Mont (1.7 mg/g). Langmuir isotherm and the pseudo-second-order kinetic models fitted the experimental results well. The main factor in the adsorption promotion was the distribution phase in the interlayer of CTAB-Mont. The arrangement of molecules analyzed by molecular simulation corresponded to the experimental data and supported the adsorption mechanism.