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Electrodeposition01:08

Electrodeposition

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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
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Applicability of paper deinking process for silver separation and concentration from a paper-based printed

João H F Conceição1,2, Denis Curtil1, Lilie Eude1

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Recycling paper-based printed electronics (PE) is feasible. Centrifugal cleaning effectively separates silver from paper fibers in recycling lines, unlike screening or flotation. Optimized conditions are key for successful PE recycling.

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Area of Science:

  • Materials Science
  • Environmental Science
  • Chemical Engineering

Background:

  • Paper-based printed electronics (PE) offer a sustainable alternative to plastic electronics.
  • The end-of-life management and recyclability of PE are not well understood.
  • PE, primarily paper, may enter conventional paper recycling streams.

Purpose of the Study:

  • To investigate the end-of-life processing of silver-based RFID antennas within a paper recycling deinking line.
  • To assess the suitability of traditional paper recycling unit operations for removing silver contaminants.
  • To determine the efficiency of silver separation using screening, centrifugal cleaning, and flotation.

Main Methods:

  • A silver-based RFID antenna prototype was disintegrated via pulping.
  • Separation efficiency of silver was evaluated using screening, centrifugal cleaning, and flotation.
  • The influence of paper substrate and experimental conditions on silver detachment and separation was analyzed.

Main Results:

  • Optimized pulping effectively detached silver particles from paper fibers.
  • Separation efficiency varied by unit operation: screening < flotation < centrifugal cleaning.
  • Flotation showed poor efficiency (20-40%), while centrifugal cleaning achieved high silver separation (70-99.9%).

Conclusions:

  • Conventional paper recycling lines can be adapted for PE recycling.
  • Optimizing unit operation conditions is crucial for efficient silver separation from PE waste.
  • Centrifugal cleaning demonstrates significant potential for removing silver contaminants in PE recycling.