Abstract

A novel in-situ route was developed to load palladium nanoparticles on the graphene oxide in this paper. Palladium ions was immobilized on graphene oxide by cation exchange, then the palladium nanoparticles supported on reduced graphene oxide (Pd NPs-rGO) was prepared via the Suzuki coupling reaction to in situ formed Pd NPs without applying additional reductants, the approach is considerably more convenient and environmentally benign compared to conventional methods for the preparation of supported metal nanoparticles. To explaining the structure and morphology, the Pd NPs-rGO nanocatalyst was characterized by FT-IR, XPS, TEM, and ICP-AES measurements. The outcomes indicate that the Pd⁰ and Pd²⁺ are spread on the surface of rGO, and their ratio would affect the catalytic activity. Pd NPs-rGO has excellent catalytic performance in Suzuki coupling reaction with high yields and it could be recovered by centrifugation. Moreover, the catalyst can be recycled seven times without significant loss of activity.

中文翻译：

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还原氧化石墨烯上钯纳米颗粒的原位绿色生成及其对铃木偶联反应的催化活性

摘要

本文开发了一种新颖的原位路线，将钯纳米颗粒负载到氧化石墨烯上。通过阳离子交换将钯离子固定在氧化石墨烯上，然后通过 Suzuki 偶联反应原位形成的 Pd NPs 制备负载在还原氧化石墨烯上的钯纳米粒子（Pd NPs-rGO），无需使用额外的还原剂，该方法更加方便与制备负载型金属纳米颗粒的传统方法相比，对环境无害。为了解释结构和形态，通过 FT-IR、XPS、TEM 和 ICP-AES 测量对 Pd NPs-rGO 纳米催化剂进行了表征。结果表明 Pd⁰ 和 Pd²⁺ 分布在rGO表面存在不同的结构，它们的比例会影响催化活性。 Pd NPs-rGO在Suzuki偶联反应中具有优异的催化性能，收率高，并且可以通过离心回收。此外，该催化剂可循环使用七次，活性没有明显损失。