Eco-friendly fabrication of Au nanoparticles immobilized on tannin-aminopropyltriethoxysilane-coated halloysite nanotube
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Eco-friendly fabrication of Au nanoparticles immobilized on tannin-aminopropyltriethoxysilanecoated halloysite nanotubes for thermally tunable catalysis Ru Yue1, Xin Wen1,* , Yannan Mao1, Yatao Su1, Qi Shen1, Hongzan Song1, Hailei Zhang1, and Xinwu Ba1,2,* 1 2
College of Chemistry and Environmental Science, Hebei University, Baoding 071002, People’s Republic of China Affiliated Hospital of Hebei University, Baoding 071000, People’s Republic of China
Received: 4 January 2020
ABSTRACT
Accepted: 30 August 2020
A facile and eco-friendly approach is developed for the fabrication of highly dispersed gold nanoparticles (Au NPs) immobilized on a thermo-responsive tannin-aminopropyltriethoxysilane (TA-APTES)-coated halloysite nanotubes (HNTs) and the application as a ‘‘smart’’ catalyst in the thermally tunable catalysis. By simply controlling the reaction conditions, the green and versatile TA-APTES coating was assembled onto the HNTs (HTA) with a controllable thickness, and subsequently the thermo-responsive poly(N-isopropylacrylamide) was grafted onto HTA (HTA-P) through a Michael addition reaction. Owing to the adhesive ability, metal ion affinity, and reducibility of TA-APTES coating, Au nanoparticles can be in situ immobilized and homogenously dispersed on both HTA and HTA-P without the assistance of any reducing agent and stabilizing agent. The as-prepared Au/HTA and Au/HTA-P exhibited superior activities in the reduction of 4-nitrophenol, which were comparable to the famous polydopamine-coated counterpart. Notably, Au/HTA-P showed a significant thermo-responsive catalytic performance, where the highest catalytic efficiency was obtained at the lower critical solution temperature of 45 °C, demonstrating the crucial role of the thermo-responsive polymer on the thermally tunable catalysis. Finally, the Au/HTA and Au/HTA-P catalysts prepared in a simple and eco-friendly manner were stable in the successive catalytic cycles, showing great potentials in industrial catalytic applications.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Handling Editor: N. Ravishankar.
Address correspondence to E-mail: [email protected]; [email protected]
https://doi.org/10.1007/s10853-020-05208-y
J Mater Sci
GRAPHIC ABSTRACT Eco-friendly tannin-aminopropyltriethoxysilane-coated halloysite nanotubes were served as multifunctional materials for the fabrication of highly active and thermo-responsive catalysts.
Introduction Integration of stimuli-responsive materials and metal nanoparticles (NPs) often promotes the formation of novel ‘‘smart’’ catalysts with unique properties [1–6]. As a class of most extensively studied material, the thermo-responsive polymers poly(N-isopropylacrylamide) (PNIPAM) can abruptly and reversibly switch their hydrophilicity and hydrophobicity at the lower critical solution temperature (LCST), undergoing a ‘‘coil-to-globule’’ phase transition in water [7–9]. In virtue of the phase transition, the metal NPs exhibit the attractive thermo-responsive features in catalysis. Up to now, t
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