Institute of Special Materials and Technology, Fudan University, 200433 Shanghai, China.
Institute of Special Materials and Technology, Fudan University, 200433 Shanghai, China.
J Colloid Interface Sci. 2017 Nov 1;505:983-994. doi: 10.1016/j.jcis.2017.06.013. Epub 2017 Jul 4.
In this work, a new design of three-dimensional (3D) molybdenum disulfide -reduced graphene oxide nanosheets supported palladium (Pd/MoS-rGO) catalyst was prepared by a facile one-pot self-assembled procedure. The existence of MoS not only succeeded in preventing the restacking of rGO nanosheets and increasing the specific surface area, but also afforded an additional transport platform for Pd nanoparticles to facilitate its catalytic properties. Because of the specific structural and different functional components, the as-prepared Pd/MoS-rGO showed superior catalytic performance and reusability towards the cross-coupling reactions and the reduction of 4-nitrophenol. Moreover, it was confirmed that the catalytic nature of Pd catalyst is a kind of similar homogeneous leaching mechanism with the hot filtration test, the solid-phase poisoning and the three-phase test, etc. This means that leaching of soluble Pd species promotes the reaction process in the liquid phase, and the leaching Pd can return to the carrier of catalyst after completion of transformation. Therefore, the rational design of 3D MoS-rGO hydrogel material supported highly active Pd nanoparticles, combined with a facile one-pot self-assembled procedure, provides a universal strategy to construct desirable 3D multifunctional nanocatalysts that can be used to research the catalytic nature of active Pd.
在这项工作中，通过简便的一锅自组装程序，制备了一种新型的三维（3D）二硫化钼-还原氧化石墨烯纳米片负载钯（Pd/MoS-rGO）催化剂。MoS 的存在不仅成功地阻止了 rGO 纳米片的堆积并增加了比表面积，而且还为 Pd 纳米粒子提供了额外的传输平台，以促进其催化性能。由于特定的结构和不同的功能组件，所制备的 Pd/MoS-rGO 对交叉偶联反应和 4-硝基苯酚的还原表现出优异的催化性能和可重复使用性。此外，通过热过滤测试、固相中毒测试和三相测试等证实了 Pd 催化剂的催化性质是一种类似的均相浸出机制。这意味着可溶性 Pd 物种的浸出促进了液相中的反应过程，并且浸出的 Pd 在转化完成后可以返回催化剂的载体。因此，合理设计 3D MoS-rGO 水凝胶材料负载高活性 Pd 纳米粒子，并结合简便的一锅自组装程序，为构建理想的 3D 多功能纳米催化剂提供了一种通用策略，可用于研究活性 Pd 的催化性质。
