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Abstract
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Anchoring and stabilization of colloidal noble metal particles (CNMPs) with good distribution have remained an enormous challenge in catalytic applications. However, designing a catalytic system with complementary properties including high surface area, high loading, extraordinary electronic properties, and easy separation offers a promising route for efficient utilization of layers nanostructures for various applications. Herein, an environmental benign approach was developed to fabricate novel catalysts consist of graphene oxide (GO) functionalized with bis-thiourea (BTU) linker. This methodology helps to stabilize and distribute colloidal palladium nanoparticles (Pd NPs) and increases the surface electron density of nanoparticles by electron-donating from BTU ligand. The catalytic activity of Pd NPs supported on the BTU surface was developed in carbon-carbon coupling reactions and nitroarenes reduction under very mild and sustainable reaction conditions. The outstanding catalytic performance can be ascribed to the stabilization of colloidal Pd with particle size 4.6 ± 0.8 nm, as well as the unique three-dimensional network structure of BTU-GO, being favorable for rapid mass transferring. Our finding indicates that the proposed catalyst is a greener, recyclable, and more suitable option for the large-scale application and could pave a way for construction of other transition metal-based catalysts for wide applications.
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