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Turning Electronic Waste to Continuous-Flow Reactor Using Porous Aromatic Frameworks.

Tingting Ma1, Rui Zhao1, Jian Song1

  • 1Key Laboratory of Polyoxometalate Science of the Ministry of Education, Faculty of Chemistry, Northeast Normal University, Changchun 130024, P. R. China.

ACS Applied Materials & Interfaces
|May 26, 2022
PubMed
Summary

This study developed a novel porous aromatic framework (PAF) for efficient gold extraction from electronic waste. The resulting gold catalyst rapidly converts pollutants, offering a valuable application in environmental remediation and catalysis.

Keywords:
continuous-flow reactorelectronic waste (e-waste)heterogeneous catalystporous aromatic frameworks“trash-to-treasure” strategy

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Catalysis

Background:

  • Electronic waste (e-waste) recycling presents challenges in cost-effectively recovering valuable metals like gold.
  • Existing methods often yield gold products unsuitable for direct reuse, necessitating alternative value-addition strategies.
  • Catalysis offers a pathway to upgrade recovered gold into higher-value materials for pollutant treatment.

Purpose of the Study:

  • To synthesize a novel porous aromatic framework (PAF) capable of efficiently extracting gold from e-waste.
  • To investigate the catalytic performance of gold nanoparticles supported on the synthesized PAF for nitroarene reduction.
  • To develop a practical application of the gold-loaded PAF in a continuous-flow system.

Main Methods:

  • Synthesis of a cationic porous aromatic framework (iPAF-7).
  • Extraction of gold from e-waste using iPAF-7.
  • Preparation and characterization of gold-loaded iPAF-7 (Au@iPAF-7) catalyst.
  • Evaluation of catalytic activity in nitroarene reduction.
  • Fabrication of an aerogel monolith incorporating iPAF-7 for continuous-flow applications.

Main Results:

  • iPAF-7 demonstrated rapid extraction of gold from e-waste.
  • Au@iPAF-7 exhibited exceptionally high catalytic activity for nitroarene to arylamine conversion (rate constant of 7.8 × 10^-2 s^-1 within 10 s).
  • The catalytic performance surpassed previously reported gold nanoparticle catalysts supported on solid materials.
  • An iPAF-7 aerogel monolith maintained excellent gold extraction and catalytic properties, suitable for continuous-flow systems.

Conclusions:

  • The synthesized iPAF-7 is an effective material for extracting gold from e-waste.
  • Au@iPAF-7 serves as a highly efficient catalyst for nitroarene reduction, outperforming existing catalysts.
  • The development of an iPAF-7 aerogel monolith demonstrates its potential for practical, continuous-flow catalytic applications in environmental remediation.