title: Enhanced catalytic activity of gold nanoparticles doped in a mesoporous organic gel based on polymeric phloroglucinol carboxylic acid-formaldehyde.
abstract: Gold nanoparticles were supported by a phloroglucinolcarboxylic acid-formaldehyde (PF) gel, a new organic gel with a 30 nm spheroid-like structure. The surface area of the PF gel with gold nanoparticles was 550 m(2)/g. Gold nanoparticles supported on a PF gel exhibited catalytic activity in the reduction of 4-nitrophenol with a reaction rate constant of 7.4 x 10(-3) s(-1), which is high in the reported heterogeneous reaction system. The adsorption behavior of 4-nitrophenol into the gel support was observed by ultraviolet-visible absorption spectroscopy. Gold nanoparticles in the PF network were characterized by scanning electron microscopy, atomic force microscopy, and transmission electron microscopy observation. The high reduction rate would be attributed to the extraction and diffusion of the reactant through the pores of a PF gel support to encounter the highly dispersed gold nanoparticles on the surface and inside the material.
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan.
authors.forename: Han
authors.initials: H
authors.lastname: Yang
authors.forename: Keiji
authors.initials: K
authors.lastname: Nagai
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Abe
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Homma
authors.forename: Takayoshi
authors.initials: T
authors.lastname: Norimatsu
authors.forename: Ramasamy
authors.initials: R
authors.lastname: Ramaraj
mesh_terms: D002264:Carboxylic Acids / Q000737:chemistry*; D002384:Catalysis; D003102:Colloids / Q000737:chemistry; D005557:Formaldehyde / Q000737:chemistry*; D005782:Gels; D006046:Gold / Q000737:chemistry*; D007700:Kinetics; D053768:Metal Nanoparticles / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning / Q000379:methods; D046529:Microscopy, Electron, Transmission / Q000379:methods; D008956:Models, Chemical; D009930:Organic Chemicals / Q000737:chemistry; D010696:Phloroglucinol / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D014466:Ultraviolet Rays
chemical_list: D002264:Carboxylic Acids; D003102:Colloids; D005782:Gels; D009930:Organic Chemicals; D011108:Polymers; D005557:Formaldehyde; D006046:Gold; D010696:Phloroglucinol