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以Na基蒙脱石为载体,分别以十二胺和PAA作为插层剂,利用此类插层剂可以捕捉金胶体的特点,使预先制备的金胶体插层于蒙脱石的层间制备组装型纳米金催化剂,并考察了高温焙烧对插层效果的影响。此外,以Au(en2)Cl3作为金的前驱体,研究了利用蒙脱石的阳离子交换特性直接进行纳米金插层组装的可行性。采用X射线衍射(XRD)、荧光分析(XRF)和透射电子显微镜(TEM)对所制备的样品进行了表征,结果表明:基于阳离子交换插层的制备方法未能实现纳米金的插层组装,金颗粒主要负载于蒙脱石片层的外表面,而基于配位俘获机理的插层组装方法所制备的纳米金在蒙脱石层间的插层组装效果良好,高温焙烧虽然导致层间纳米金的迁移,但金的粒径仍然保持在较低的尺寸范围。
Taking Na-montmorillonite as carrier and dodecylamine and PAA as intercalation agents respectively, the characteristics of gold colloids can be captured by using such intercalation agents, and the gold colloids prepared in advance are intercalated into the interlayer of montmorillonite Assembled nano-gold catalyst, and investigated the impact of high temperature calcination on the intercalation effect. In addition, using Au (en2) Cl3 as a gold precursor, the feasibility of intercalation and assembly of nanostructured gold directly by utilizing the cation exchange characteristics of montmorillonite was studied. The prepared samples were characterized by X-ray diffraction (XRD), fluorescence analysis (XRF) and transmission electron microscopy (TEM). The results showed that the preparation method based on cation exchange intercalation failed to realize intercalation and assembly of nano- The gold particles are mainly supported on the outer surface of the montmorillonite lamellae. The intercalation and assembly of gold nanoparticles prepared by the intercalation and assembly method based on the coordination and trapping mechanism are good between the montmorillonite layers. Although calcination at high temperature leads to inter-layer nanostructures The migration of gold, but the particle size of gold is still maintained at a lower size range.