1. Carbonized wood impregnated with bimetallic nanoparticles as a monolithic continuous-flow microreactor for the reduction of 4-nitrophenol.
- Author
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Zhang, Qingtong, Somerville, Rosie J., Chen, Lan, Yu, Yuanyuan, Fei, Zhaofu, Wang, Shuangfei, Dyson, Paul J., and Min, Douyong
- Subjects
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WOOD , *ELECTRON paramagnetic resonance spectroscopy , *GOLD nanoparticles , *WOOD chemistry , *ELECTRON diffusion , *MONOLITHIC reactors , *DENSITY functional theory , *QUANTUM cascade lasers - Abstract
Porous monolithic microreactors show great promise in catalytic applications, but are usually based on non-renewable materials. Herein, we demonstrate a Ni/Au nanoparticle-decorated carbonized wood (Ni/Au-CW) monolithic membrane microreactor for the efficient reduction of 4-nitrophenol. The hierarchical porous wood structure supports uniformly distributed heterobimetallic Ni/Au nanoparticles. As a consequence of these two factors, both mass diffusion and electron transfer are enhanced, resulting in a superior reduction efficiency of 99.5% as the liquor flows through the optimised Ni/Au-CW membrane. The reaction mechanism was investigated by electron paramagnetic resonance spectroscopy and density functional theory calculations. The proposed attraction-repulsion mechanism facilitated by the bimetallic nanoparticles has been ascribed to the different electronegativities of Ni and Au. The Ni/Au-CW membrane exhibits excellent catalytic performance and could be applicable to other catalytic transformations. [Display omitted] • Carbonized wood decorated with Ni/Au nanoparticles exhibits high catalytic property. • Long-curved wood channels enhances the interaction between pollutant and catalyst. • Ni/Au-CW catalyzes the reduction of 4-nitrophenol under continuous-flow conditions. • An attraction-repulsion catalytic mechanism is proposed with DFT calculations. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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