Solubilization in Confined Surfactant Mesophases
Solubilization in Confined Surfactant Mesophases
复制标题
限域表面活性剂中间相的增溶
作者：
and R. Denoyel;E. Rey
MCM-41型介孔材料通过使用基于胶束的晶体模板法合成：例如，使用二氧化硅源和阳离子烷基三甲基卤化铵表面活性剂，在获得六方有机/无机中间相的条件下。无论合成机理如何，这一直是一个争论的主题，2，3很明显，表面活性剂在MCM-41的形成中起着至关重要的作用，因为它不仅决定了孔径，而且对硅酸盐聚合具有催化作用。4在例如通过煅烧除去表面活性剂之后，获得具有非常均匀的孔尺寸和形状以及高热稳定性的材料。这些材料在催化、电子、光学和磁性应用中具有潜在的用途。5，6通过官能化分子对它们进行改性可以产生具有特定性质的吸附剂。7虽然MCM-41是1992年才发现的，但其中许多应用已经被探索，其中一些应用的商业应用并不遥远，然而，据我们所知，迄今为止尚未报道的一个应用是将疏水有机分子从水溶液中吸附到未煅烧的中间相的可能性。的确，人们越来越有兴趣研究利用不同的生物和物理化学技术去除水中的有机污染物。8在后几种方法中，使用不同的吸附剂似乎是最有效的技术之一。活性炭过滤器是由-
MCM-41 type mesoporous materials are synthesized by using a micelle-based crystal templating method: 1 for example, with a source of silica and a cationic alkyltrimethylammonium halide surfactant, in conditions where a hexagonal organic/inorganic mesophase is obtained. Regardless of the synthesis mechanism which has been a subject of debate, 2, 3 it is evident that the surfactant plays a vital role in the formation of MCM-41 since not only does it determine the pore size but also it has a catalytic action on the silicate polymerization. 4 After elimination of the surfactant, for example, by calcination, a material is obtained with very uniform pore size and shape and high thermal stability. These materials are potentially useful for catalytic, electronic, optical, and magnetic applications. 5, 6 Their modification by functionalized molecules can lead to adsorbents with specific properties. 7 Although MCM-41 was only discovered in 1992, many of these applications have already been explored and the commercial application of some of them is not too distant.However, an application which has not been reported until now, to our knowledge, is the possibility of sorption of hydrophobic organic molecules from aqueous solution into the noncalcined mesophase. There is, indeed, an increasing interest in studying the removal of organic pollutants from water by using different biological and physicochemical techniques. 8 Among the latter methods, the use of different sorbents seems to be one of the most effective technologies. Activated carbon filters are com-