Burgos A E, Ribeiro-Santos Tatiana A, Lago Rochel M
Grupo de Investigación en Química de Coordinación y Bioinorgánica, Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia, Sede-Bogotá, Av. Cra 30 N°. 45-03, Bogotá, Colombia E-mail:
Chemistry Department, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
Water Sci Technol. 2016;74(3):663-71. doi: 10.2166/wst.2016.207.
Hydrophobic cavities produced by cetyltrimethylammonium cation (CTA(+)) exchanged and trapped in the interlayer space of montmorillonite were used to remove the harmful hormone contaminant ethinyl estradiol (EE2) from water. X-ray diffraction, thermogravimetry/derivative thermogravimetry, elemental analysis (carbon, hydrogen, nitrogen), Fourier transform infrared, scanning electron microscopy/energy dispersive spectroscopy, Brunauer-Emmett-Teller and contact angle analyses showed that the intercalation of 9, 16 and 34 wt% CTA(+) in the montmorillonite resulted in the d001 expansion from 1.37 to 1.58, 2.09 and 2.18 nm, respectively. EE2 adsorption experiments showed that the original clay montmorillonite does not remove EE2 from water whereas the intercalated composites showed high efficiency with adsorption capacities of 4.3, 8.8 and 7.3 mg g(-1) for M9CTA(+), M16CTA(+) and M34CTA(+), respectively. Moreover, experiments with montmorillonite simply impregnated with cetyltrimethylammonium bromide showed that the intercalation of CTA(+) to form the hydrophobic cavity is very important for the adsorption properties. Simple solvent extraction can be used to remove the adsorbed EE2 without significant loss of CTA(+), which allows the recovery and reuse of the adsorbent for at least five times.
通过十六烷基三甲基铵阳离子（CTA(+)）交换并捕获在蒙脱石层间空间中产生的疏水空腔，被用于从水中去除有害激素污染物乙炔雌二醇（EE2）。X射线衍射、热重分析/微商热重分析、元素分析（碳、氢、氮）、傅里叶变换红外光谱、扫描电子显微镜/能量色散光谱、布鲁诺尔-埃米特-泰勒比表面积分析和接触角分析表明，在蒙脱石中插入9%、16%和34%重量比的CTA(+)分别导致d001从1.37纳米扩展到1.58、2.09和2.18纳米。EE2吸附实验表明，原始的粘土蒙脱石不能从水中去除EE2，而插层复合材料表现出高效性，M9CTA(+)、M16CTA(+)和M34CTA(+)的吸附容量分别为4.3、8.8和7.3毫克/克。此外，用十六烷基三甲基溴化铵简单浸渍蒙脱石的实验表明，CTA(+)插层形成疏水空腔对吸附性能非常重要。简单的溶剂萃取可用于去除吸附的EE2，而CTA(+)不会有明显损失，这使得吸附剂能够回收并重复使用至少五次。
