Ambrozova Pavlina, Kynicky Jindrich, Urubek Tomas, Nguyen Vinh Dinh
Faculty of Forestry and Wood Technology, Mendel University in Brno, Zemedelska 1, 61300 Brno, Czech Republic.
Central European Institute of Technology, Brno University of Technology, Purkynova 656/123, 61200 Brno, Czech Republic.
Molecules. 2017 Jul 4;22(7):1107. doi: 10.3390/molecules22071107.
Clinoptilolite is a natural mineral with exceptional physical characteristics resulting from its special crystal structure, mainstreamed into a large zeolite group called heulandites. An overall view of the research related to the synthesis, modification and application of synthetic clinoptilolite is presented. A single phase of clinoptilolite can be hydrothermally synthesized for 1-10 days in an autoclave from various silica, alumina, and alkali sources with initial Si/Al ratio from 3.0 to 5.0 at a temperature range from 120 to 195 °C. Crystallization rate and crystallinity of clinoptilolite can be improved by seeding. The modification of clinoptilolite has received noticeable attention from the research community, since modified forms have specific properties and therefore their area of application has been broadening. This paper provides a review of the use of organic compounds such as quarter alkyl ammonium, polymer, amine and inorganic species used in the modification process, discusses the processes and mechanisms of clinoptilolite modification, and identifies research gaps and new perspectives.
斜发沸石是一种天然矿物，因其特殊的晶体结构而具有优异的物理特性，属于名为片沸石的大型沸石族。本文对合成斜发沸石的合成、改性及应用相关研究进行了综述。可以在高压釜中，以各种硅源、铝源和碱源为原料，在120至195°C的温度范围内，初始硅铝比为3.0至5.0的条件下，水热合成斜发沸石单相1至10天。通过晶种可以提高斜发沸石的结晶速率和结晶度。斜发沸石的改性受到了研究界的显著关注，因为改性形式具有特定性能，因此其应用领域不断拓宽。本文综述了季铵盐、聚合物、胺等有机化合物以及改性过程中使用的无机物种在斜发沸石改性中的应用，讨论了斜发沸石改性的过程和机理，并指出了研究差距和新的研究方向。
