Kooli Fethi
Institute of Chemical and Engineering Sciences, Pesek Road, Jurong Island, Singapore 627833.
Langmuir. 2009 Jan 20;25(2):724-30. doi: 10.1021/la802533y.
The intercalation process of acid-treated montmorillonite clays by a cationinc surfactant (decyltrimethylammonuium) from a hydroxide solution was affected by the temperature of acid activation. Although the cation exchange capacity of the treated clay at 90 degrees C (0.74 mequiv g(-1)) was lower compared to that treated at room temperature (0.84 mequiv g(-1)), the uptaken amount of the surfactant (1.24 mmol g(-1)) and thus the basal spacing (3.83 nm) were higher. These values depended on the initial loading concentrations. However, when the clay was treated at room temperature, the uptaken amounts of surfactant (0.81 mmol g(-1)) and the basal spacing (2.20 nm) were lower. These values were independent of the initial loading concentration. The higher basal spacing (3.83 nm) was also affected by the type of the exchange medium and the washing solution by a mixture of ethanolic solutions. The intercalation of the surfactants occurred in two different ways, and was related to exfoliation properties of the acid activated clays. The intercalated surfactant exhibited different conformations in the interlayer space and different thermal stability.
来自氢氧化物溶液的阳离子表面活性剂（癸基三甲基铵）对酸处理蒙脱石粘土的插层过程受酸活化温度的影响。尽管90℃下处理的粘土的阳离子交换容量（0.74 mequiv g(-1)）比室温下处理的（0.84 mequiv g(-1)）低，但表面活性剂的吸收量（1.24 mmol g(-1)）以及因此的基面间距（3.83 nm）更高。这些值取决于初始负载浓度。然而，当粘土在室温下处理时，表面活性剂的吸收量（0.81 mmol g(-1)）和基面间距（2.20 nm）较低。这些值与初始负载浓度无关。较高的基面间距（3.83 nm）也受交换介质类型和乙醇溶液混合物洗涤液的影响。表面活性剂的插层以两种不同方式发生，并且与酸活化粘土的剥离性质有关。插层的表面活性剂在层间空间表现出不同的构象和不同的热稳定性。
