Protein Particles Decorated with Pd Nanoparticles for the Catalytic Reduction of p-Nitrophenol to p-Aminophenol

Abstract

Nano-biomaterial hybridization is a promising strategy to generate unique and advanced material properties that are not available with nano-or biomaterials alone. In particular, the surface stabilizer (surfactant)-free synthesis of catalytic metal nanoparticles (NPs) on biological scaffolds such as protein particles (PPs) holds great potential in improving their catalytic performance because the surfactants form an organic layer on the NP surface and severely deactivate the catalytic surface. Here, we report the surfactant-free synthesis of palladium nanoparticles (PdNPs) using PPs as a synthetic scaffold and the significantly improved catalytic performance of the Pd−protein nanocomposites (PdNP−PPs). The PdNP−PPs have many small PdNPs with clean surface and enlarged surface area on the PP surface. Because of the charge property of PPs, the PdNP−PPs are well dispersed without being aggregated in reaction solutions and exhibit much higher catalytic activity and better durability/ recyclability compared with surfactant-coated PdNPs in the reduction reaction converting p-nitrophenol to p-aminophenol.

NHC Polymeric Particles Obtained by Self-Assembly and Click Approach of Calix[4]Arene Amphiphiles as Support for Catalytically Active Pd Nanoclusters

“…Taking into account very low Pd loading (3.2 nanomoles), the obtained catalytic systems outperform recently published systems. For example, Pd-protein nanocomposites, obtained by Yu et al [30], demonstrate RC in the PNP reduction as 0.005 s −1 , which is an order of magnitude lower than that of Pd and polymer system (0.0132 s −1 ). Pd, supported on chitosan-Fe 3 O 4 nanocomposite obtained by Veisi et al [31], also demonstrates lower rates in the PNP reduction (0.0026 s −1 ).…”

Hybridization of Palladium Nanoparticles with Aromatic‐Rich SU‐101 Metal‐Organic Framework for Effective Transfer Hydrogenation

“…Most of the reports use of NaBH 4 (not stable in water) as hydrogen source for this transformation apart from molecular H 2 . [23,[52][53][54] In the present study, we have tested both Pd-WCGA/SU-101 and Pd/SU-101 catalysts for the transfer hydrogenation of 4-NP with AB and compared their activities.…”

Pd-Nanoparticles@layered double hydroxide/reduced graphene oxide (Pd NPs@LDH/rGO) nanocomposite catalysts for highly efficient green reduction of aromatic nitro compounds

“…Palladium nanoparticles (Pd NPs) have received significant research interest due to their unique surface properties and efficient catalytic activity in various organic reactions including hydrogenation, oxidation and cross-coupling reactions. 1–4 Very small Pd NPs (<5 nm) usually show excellent reactivity, but they are thermodynamically unstable and aggregate into larger particles through the minimization of surface energies. 5 Thus, the aggregation of tiny Pd NPs decreases the active surface atom and overall catalytic activity.…”