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Hypercrosslinked mesoporous polymers: Synthesis, characterization and its application for catalytic reduction of 4-nitrophenol

https://doi.org/10.1016/j.colcom.2020.100285Get rights and content

Highlights

  • A mesoporous hypercrosslinked polymer has been synthesized from heterocyclic ionic liquids.

  • Bismuth, a cheap transition metal, has replaced precious metals to reduce 4-nitrophenol to 4-aminophenol.

  • The hypercrosslinked polymer can be a perfect platform for loading various catalysts for diverse applications.

Abstract

A mesoporous hypercrosslinked polymer (HCP), derived from a Friedel-Crafts alkylation reaction of 1,4-bis(chloromethyl)benzene and a precursor contained heterocyclic ionic liquids, was synthesized, having a high specific surface area with abundant mesopore and specific porosity. In order to reduce 4-nitrophenol (4-NP) to 4-aminophenol (4-AP), a new bismuth nanoparticle/HCP composite (Bi/HCP) as a catalyst was prepared, where the HCP was used as a catalyst carrier. Herein, the HCP was firstly impregnated into a BiCl3 solution to adsorb the Bi3+ ions. After that, these Bi3+ ions adsorbed were then reduced in situ using KBH4, affording the ultimate Bi/HCP composite. In such Bi/HCPs, Bi nanoparticles with a small diameter of 1–3 nm were evenly dispersed. In this work, the Bi/HCPs exhibit an excellent catalytic performance toward the reduction of 4-NP with a low loading, the reaction rate constant k is calculated to be 2.2 min−1, and the catalytic activity did not decrease even after 8 reaction cycles.

Section snippets

Acknowledgments

This work is supported by the National Natural Science Foundation of China (No. 21576079, 91834301), the 111 Project of Ministry of Education of China (No. B08021), and the Fundamental Research Funds for the Central Universities of China.

Declaration of competing interests

We declare that we have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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