One‐step synthesis of Pt@three‐dimensional graphene composite hydrogel: an efficient recyclable catalyst for reduction of 4‐nitrophenol

Abstract

A Pt@three-dimensional graphene (Pt@3DG) composite hydrogel with a unique porous nanostructure was prepared and used as an efficient, recyclable and robust catalyst for the reduction of 4-nitrophenol to 4-aminophenol under mild conditions. The influence of graphene architecture on catalytic activities was comparatively investigated by loading the same amount of Pt on reduced graphene oxide. Pt@3DG exhibits a very high catalytic activity owing to the three-dimensional macroporous framework with high specific surface area, numerous activation sites and efficient transport pathways. Moreover, catalyst separation can be easily achieved by simple filtration, and the catalyst can be reused for at least five runs, maintaining its high catalytic activity.

Application of a nanostructured sensor based on graphene‐ and ethyl 2‐(4‐ferrocenyl[1,2,3]triazol‐1‐yl)acetate‐modified carbon paste electrode for determination of methyldopa in the presence of phenylephrine and guaifenesin

“…Graphene or graphene oxide is a two‐dimensional lattice of carbon in a honeycomb pattern which has attracted attention to a great extent as an efficient modifier in electrochemical chemistry due to its unique properties and ease of production on a large scale . In general, graphene is a nonpolar and hydrophobic modifier with a large delocalized π‐electron system which can make strong π–π stacking interactions with the benzene rings.…”

Biomimetic complexes‐graphene composites for redox processes

“…In the last decade, three‐dimensional graphene‐based materials like graphene aerogels and foams had emerged as a new class of neoteric generation porous carbon materials, that could be applied as versatile support for immobilizing metals and metal oxides for different processes, particularly as a heterogeneous catalyst . As well as, to improve the performance and interaction of oxygen with the surface of the material and the reactant in the oxidation progress, chemical modification of the support with nitrogen doping, biomimetic ligands and metals are a practical approach.…”

Facile preparation of surfactant-free Au NPs/RGO/Ni foam for degradation of 4-nitrophenol and detection of hydrogen peroxide

“…Recently, much effort has been devoted to developing hybrid catalysts by immobilizing metal NPs onto various supporting materials, such as carbon nanotubes [7][8][9], graphene [10][11][12], Fe 3 O 4 [13], TiO 2 [2,14,15], and polymer [16][17][18], which is considered an effective strategy to avoid agglomeration and improve catalytic activity. Of particular interest is reduced graphene oxide (RGO), which is a honeycomb-like sheet of carbon with the properties of a large specific surface area, which makes it an ideal carrier of metal NPs such as Cu [19], Ag [20], Au [21,22], Pt [23], Pd [24], for applications in catalysts and sensors. Such a kind of two-dimensional (2D) graphene sheet carrier could possibly not only improve the dispersion of Au NPs but also produce the synergistic effect to further improve their properties.…”