Organoclays prepared from montmorillonites with different cation exchange capacity and surfactant configuration
Organoclays prepared from montmorillonites with different cation exchange capacity and surfactant configuration
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DOI：
10.1016/j.clay.2009.11.024
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发表时间：
2010-03-01
影响因子：
5.6
通讯作者：
Qing, Yanhong
中科院分区：
文献类型：
--
作者：
He, Hongping;Ma, Yuehong;Qing, Yanhong
有机改性蒙脱土由于其在工业和环境保护方面的广泛应用而引起了人们极大的兴趣。以不同阳离子交换容量（CEC）的蒙脱土和不同烷基链数和链长的表面活性剂为原料，合成了有机蒙脱土。采用X射线衍射（XRD）和差示热重（DIG）对有机蒙脱土进行了表征。有机蒙脱土的层间距随着表面活性剂的负载量的增加而增加，而最大层间距随着表面活性剂的烷基链长度的增加而增加。对于相同的表面活性剂，有机蒙脱土的最大层间距几乎不受蒙脱土组分CEC的影响。然而，达到最大基底间距所需的表面活性剂负载水平强烈依赖于CEC。对于给定的烷基链长，最大的基线间距增加时，链数从一个增加到两个。这些发现对制备低成本的工业用有机粘土具有重要意义。(C)2009 Elsevier B.V.保留所有权利。
Organically modified montmorillonites ('organo-montmorillonites') have attracted a great deal of interest because of their wide applications in industry and environmental protection. We have synthesized organo-montrriorillonites using montmorillonites with different cation exchange capacities (CEC) and surfactants with different alkyl chain number and chain length. The organo-montmorillonites were characterized by X-ray diffraction (XRD) and differential thermogravimetry (DIG). The basal spacing of the organo-montmorillonites increased with surfactant loading, while the maximum basal spacing increased as the alkyl chain length of the surfactant increased. For the same surfactant, the maximum basal spacing of the organo-montmorillonites was little influenced by the CEC of the montmorillonite component. The level of surfactant loading required to reach the maximum basal spacing, however, strongly depended on the CEC. For a given alkyl chain length, the maximum basal spacing increased when the chain number increased from one to two. These findings are important to the preparation of low-cost organoclays for industrial applications. (C) 2009 Elsevier B.V. All rights reserved.