Metal nanoparticle loading of gel-brush grafted polymer fibers in membranes for catalysis

We report on the preparation, characterization, and catalytic activity of microporous membranes featuring palladium (Pd) nanoparticles (NPs). The membranes consisted of polycaprolactone (PCL) microfibers featuring gel-brush layers of poly(hydroxyethyl methacrylate) (PHEMA). Pd nanoparticle loading w...

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Veröffentlicht in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2018, Vol.6 (17), p.7741-7748
Hauptverfasser: Liu, Yan, Zhang, Kaihuan, Li, Weiya, Ma, Jinghong, Vancso, G. Julius
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container_issue 17
container_start_page 7741
container_title Journal of materials chemistry. A, Materials for energy and sustainability
container_volume 6
creator Liu, Yan
Zhang, Kaihuan
Li, Weiya
Ma, Jinghong
Vancso, G. Julius
description We report on the preparation, characterization, and catalytic activity of microporous membranes featuring palladium (Pd) nanoparticles (NPs). The membranes consisted of polycaprolactone (PCL) microfibers featuring gel-brush layers of poly(hydroxyethyl methacrylate) (PHEMA). Pd nanoparticle loading was achieved by in situ reduction of Pd 2+ , coordinated to carboxylate groups in the brush, in aqueous Pd(NO 3 ) 2 electrolytes by using NaBH 4 . Gel-brushes were obtained via surface-initiated atom transfer radical polymerization (ATRP) polymerization. The membrane mats prior to functionalization were fabricated by electrospinning of PCL solutions. The PCL included mixtures of Br terminated PCL chains with a non-functional polymer. The electrospun fibers thus featured Br at their surface, which functioned as initiators, and allowed us to polymerize polymer gel-brushes at the fiber surface. The formation of Pd nanoparticles was evidenced by SEM and TEM. The membranes obtained had a large specific surface area and high porosity, which enabled high concentrations of metal nanoparticle loadings. The structure and morphology of the membranes were characterized by FTIR, SEM, TGA, and static contact angle measurements. The membranes obtained showed pronounced catalytic activity due to the presence of Pd NPs. As a proof-of-principle experiment we performed the catalytic reduction of 4-nitrophenol to 4-aminophenol in continuous flow-through catalysis. We report on the preparation, characterization, and catalytic activity of microporous membranes featuring palladium (Pd) nanoparticles (NPs).
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Julius</creator><creatorcontrib>Liu, Yan ; Zhang, Kaihuan ; Li, Weiya ; Ma, Jinghong ; Vancso, G. Julius</creatorcontrib><description>We report on the preparation, characterization, and catalytic activity of microporous membranes featuring palladium (Pd) nanoparticles (NPs). The membranes consisted of polycaprolactone (PCL) microfibers featuring gel-brush layers of poly(hydroxyethyl methacrylate) (PHEMA). Pd nanoparticle loading was achieved by in situ reduction of Pd 2+ , coordinated to carboxylate groups in the brush, in aqueous Pd(NO 3 ) 2 electrolytes by using NaBH 4 . Gel-brushes were obtained via surface-initiated atom transfer radical polymerization (ATRP) polymerization. The membrane mats prior to functionalization were fabricated by electrospinning of PCL solutions. The PCL included mixtures of Br terminated PCL chains with a non-functional polymer. The electrospun fibers thus featured Br at their surface, which functioned as initiators, and allowed us to polymerize polymer gel-brushes at the fiber surface. The formation of Pd nanoparticles was evidenced by SEM and TEM. The membranes obtained had a large specific surface area and high porosity, which enabled high concentrations of metal nanoparticle loadings. The structure and morphology of the membranes were characterized by FTIR, SEM, TGA, and static contact angle measurements. The membranes obtained showed pronounced catalytic activity due to the presence of Pd NPs. As a proof-of-principle experiment we performed the catalytic reduction of 4-nitrophenol to 4-aminophenol in continuous flow-through catalysis. We report on the preparation, characterization, and catalytic activity of microporous membranes featuring palladium (Pd) nanoparticles (NPs).</description><identifier>ISSN: 2050-7488</identifier><identifier>EISSN: 2050-7496</identifier><identifier>DOI: 10.1039/c8ta01231h</identifier><language>eng</language><publisher>Cambridge: Royal Society of Chemistry</publisher><subject>Aminophenol ; Aqueous electrolytes ; Brushes ; Catalysis ; Catalytic activity ; Chemical reduction ; Chemical Sciences ; Contact angle ; Continuous flow ; Fibers ; Initiators ; Material chemistry ; Mats ; Membranes ; Metal concentrations ; Microfibers ; Nanoparticles ; Nitrophenol ; Palladium ; Polycaprolactone ; Polyhydroxyethyl methacrylate ; Polymerization ; Polymers ; Porosity</subject><ispartof>Journal of materials chemistry. 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Julius</creatorcontrib><title>Metal nanoparticle loading of gel-brush grafted polymer fibers in membranes for catalysis</title><title>Journal of materials chemistry. A, Materials for energy and sustainability</title><description>We report on the preparation, characterization, and catalytic activity of microporous membranes featuring palladium (Pd) nanoparticles (NPs). The membranes consisted of polycaprolactone (PCL) microfibers featuring gel-brush layers of poly(hydroxyethyl methacrylate) (PHEMA). Pd nanoparticle loading was achieved by in situ reduction of Pd 2+ , coordinated to carboxylate groups in the brush, in aqueous Pd(NO 3 ) 2 electrolytes by using NaBH 4 . Gel-brushes were obtained via surface-initiated atom transfer radical polymerization (ATRP) polymerization. The membrane mats prior to functionalization were fabricated by electrospinning of PCL solutions. The PCL included mixtures of Br terminated PCL chains with a non-functional polymer. 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source Royal Society Of Chemistry Journals 2008-
subjects Aminophenol
Aqueous electrolytes
Brushes
Catalysis
Catalytic activity
Chemical reduction
Chemical Sciences
Contact angle
Continuous flow
Fibers
Initiators
Material chemistry
Mats
Membranes
Metal concentrations
Microfibers
Nanoparticles
Nitrophenol
Palladium
Polycaprolactone
Polyhydroxyethyl methacrylate
Polymerization
Polymers
Porosity
title Metal nanoparticle loading of gel-brush grafted polymer fibers in membranes for catalysis
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