Gold nanoparticles decorated on a graphene-periodic mesoporous silica sandwich nanocomposite as a highly efficient and recyclable heterogeneous catalyst for catalytic applications

Abstract

ARTICLE This journal isThe ultra-small Au nanoparticles (Au NPs) immobilized HS-functionalized sandwich-like periodic mesoporous silica (PMS) coated graphene (G) to form a novel nanocomposite catalyst Au NPs@HS-G-PMS. The synthesized Au NPs@HS-G-PMS nanocatalyst exhibited excellent catalytic activity on the three kinds of organic reactions. The reduction of 4-nitrophenol by sodium borohydride, the Suzuki-Miyaura cross coupling reaction of aryl halides with phenyl boronic acid and three coupling reaction of aldehyde, alkyne, and secondary amine (A 3 -coupling) in water were successfully done. Most importantly, the catalyst could be used repetitively more than six times without significant deactivation.

Synthesis of gold nanoparticles decorated on sulfonated three‐dimensional graphene nanocomposite and application as a highly efficient and recyclable heterogeneous catalyst for Ullmann homocoupling of aryl iodides and reduction of p‐nitrophenol

“…[45] After decoration of Au NPs on 3DG-SO 3 H, the surface area increased to 84.41 m 2 g −1 , which can be attributed the Au NPs acting as spacers in the 3DG network thereby preventing agglomeration and hydrogen bonding between neighbouring sheets. [35] As shown in Figure 6, the nitrogen sorption isotherms of the three materials are of type IV.…”

“…After sulfonation, the surface area markedly decreased from 86.70 to 28.09 m 2 g −1 that can be attributed to the sulfonic acid groups which are capable of hydrogen bonding, promoting intermolecular interactions between neighbouring sheets, and resulting in a reduction in the free volume . After decoration of Au NPs on 3DG‐SO 3 H, the surface area increased to 84.41 m 2 g −1 , which can be attributed the Au NPs acting as spacers in the 3DG network thereby preventing agglomeration and hydrogen bonding between neighbouring sheets . As shown in Figure , the nitrogen sorption isotherms of the three materials are of type IV.…”

“…In conjunction with our research aimed at the preparation of metal–graphene composite catalysts for organic reactions, herein we report a novel protocol for the Ullmann homocoupling reaction catalysed by Au NPs@3DG‐SO 3 H composite in aqueous solution. The preparation of the Au NPs@3DG‐SO 3 H nanocomposite is described in Scheme .…”

“…Biaryl scaffolds are ubiquitous building blocks in many biologically active compounds, commercial dyes, agrochemicals, natural products, conducting materials and pharmaceutical organic compounds. [32] In conjunction with our research aimed at the preparation of metal-graphene composite catalysts for organic reactions, [33][34][35] herein we report a novel protocol for the Ullmann homocoupling reaction catalysed by Au NPs@3DG-SO 3 H composite in aqueous solution. The preparation of the Au NPs@3DG-SO 3 H nanocomposite is described in Scheme 1.…”

Recent Progress in Application of Graphene Supported Metal Nanoparticles in C−C and C−X Coupling Reactions

“…In 2015, Dabiri et al. successfully synthesized a gold nanocatalyst through immobilization of ultra‐small Au NPs onto the HS‐functionalized sandwich‐like periodic mesoporous silica (PMS) coated graphene (G) . The 2D sandwich‐like graphene‐based periodic mesoporous silica (G‐PMS) were prepared through combining sol‐gel and in situ reduction process in the presence of the cationic surface tantcetyltrimethylammonium bromide (CTAB), tetraethylorthosilicate (TEOS) and hydrazine (Scheme ).…”