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Ultrafine silver nanoparticles supported on a covalent carbazole framework as high-efficiency nanocatalysts for nitrophenol reduction

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Abstract

A novel conjugated microporous polymer (CMP) material CZ–TEB was synthesized with a carbazole analogue and 1,3,5-triethynylbenzene. It possessed a high specific surface area, excellent thermal stability and layered-sheet morphology. Furthermore, ultrafine silver nanoparticles were successfully immobilized on CZ–TEB, thus preparing a nanocatalyst Ag0@CZ–TEB. To evaluate its catalytic performance, Ag0@CZ–TEB was exploited in the reduction reaction of nitrophenols, a family of priority pollutants. Ag0@CZ–TEB exhibited high catalytic ability, convenient recovery and excellent reusability. Strikingly, the normalized rate constant (knor) of the reduction reaction of 4-NP to 4-AP is as high as 21.49 mmol−1 s−1. This result shows a significant improvement over all previously reported work. We purposed to use a “capture–release” model to explain the high catalytic ability of Ag0@CZ–TEB. This explanation is supported by further experimental results that agree well with the “capture–release” model.

Graphical abstract: Ultrafine silver nanoparticles supported on a covalent carbazole framework as high-efficiency nanocatalysts for nitrophenol reduction

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Publication details

The article was received on 06 Mar 2019, accepted on 08 May 2019 and first published on 08 May 2019


Article type: Communication
DOI: 10.1039/C9TA02457C
J. Mater. Chem. A, 2019, Advance Article

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    Ultrafine silver nanoparticles supported on a covalent carbazole framework as high-efficiency nanocatalysts for nitrophenol reduction

    W. Gong, Q. Wu, G. Jiang and G. Li, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA02457C

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