Phenanthrene Sorption on Palygorskite Modified with Gemini Surfactants: Insights from Modeling Studies and Effects of Aqueous Solution Chemistry
Phenanthrene Sorption on Palygorskite Modified with Gemini Surfactants: Insights from Modeling Studies and Effects of Aqueous Solution Chemistry
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DOI：
10.1007/s11270-015-2716-8
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Shan Zhao;Gordon H. Huang;Jia Wei;C. An;Peng Zhang
中科院分区：
文献类型：
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作者：
Shan Zhao;Gordon H. Huang;Jia Wei;C. An;Peng Zhang
研究了双子改性凹凸棒石（PGS）作为一种新型修复材料对多环芳烃（PAHs）污染水体的修复效果。采用改进的两步吸附分配模型（TAPM）研究了双子表面活性剂在PGS/水界面上的吸附行为。采用红外光谱、阳离子交换容量和比表面积分析等方法对孪晶改性PGS进行了表征。系统研究了pH值、离子强度、腐殖酸和温度对未处理和改性PGS吸附菲的影响。平衡数据的分析表明，双子座的吸附等温线拟合TAPM。双子表面活性剂对PGS的改性为菲提供了良好的分配介质，提高了菲在固体颗粒中的滞留。溶液参数对PHE在改性PGS上的吸附有显著影响。不同温度下PGS对菲的吸附等温线均符合Freundlich方程。热力学计算证实，在293 ~ 303 K范围内，PHE在改性PGS上的吸附过程是自发的放热过程。结果表明，双子表面活性剂的改性可能使粘土矿物具有一些独特的表面特性，可作为一种新型的修复材料。这为PGS在多环芳烃污染水体修复过程中的潜在应用提供了参考。
The effectiveness of gemini-modified palygorskite (PGS) as the novel remediation material in polycyclic aromatic hydrocarbons (PAHs)-contaminated water remediation was revealed and examined. The sorption behavior of gemini surfactants at the PGS/aqueous interface was addressed using a developed two-step adsorption and partition model (TAPM). The characterizations of gemini-modified PGS were investigated using infrared spectroscopy, cationic exchange capacity, and surface area analysis. The effects of pH, ionic strength, humic acid, and temperature on sorption of phenanthrene (PHE) to untreated and modified PGS were systematically studied. Analysis of the equilibrium data indicated that the sorption isotherms of gemini fitted TAPM well. The modification of PGS with gemini surfactants provided a favorable partition medium for PHE and enhanced PHE retention in solid particles. The solution parameters played significant effects on PHE sorption to the modified PGS. The sorption isotherms of PHE on PGS at different temperatures well fitted the Freundlich equation. Thermodynamic calculations confirmed that the sorption process of PHE on modified PGS was spontaneous and exothermic from 293 to 303 K. It is revealed that the modification with gemini surfactants probably offered some unique surface characteristics to the clay mineral as a new type of remediation material. This can provide a reference to the potential application of PGS in PAH-contaminated water remediation process.