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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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A facile room temperature method to recycle Cd from CdS.

Huazhang Feng1, Tingting Xu1, Yuanmin Zhu2

  • 1College of New Materials and New Energies, Shenzhen Technology University, Shenzhen, Guangdong 518118, PR China.

Heliyon
|April 25, 2023
PubMed
Summary

This study presents a new, fast room-temperature method to recycle cadmium (Cd) from cadmium sulfide (CdS) semiconductors. The process efficiently recovers 88% of Cd, offering a sustainable solution for hazardous waste.

Keywords:
CadmiumCadmium recyclingCadmium sulphideRoom temperatureSolution process

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Chemical Engineering

Background:

  • Cadmium-based semiconductors are vital for optoelectronics and energy applications.
  • Environmental concerns necessitate efficient recycling of toxic cadmium (Cd) from semiconductor waste.
  • Current recycling methods, like CdS precipitation, pose risks due to cadmium sulfide's environmental instability.

Purpose of the Study:

  • To develop a facile and efficient room-temperature method for recycling cadmium from cadmium sulfide.
  • To address the environmental challenges associated with cadmium-based semiconductor waste.
  • To provide a viable route for recovering cadmium metal as a raw material.

Main Methods:

  • A novel room-temperature recycling process using a lithium-ethylenediamine solution.
  • Characterization using X-ray Diffraction (XRD), Scanning Transmission Electron Microscopy-High-Angle Annular Dark-Field (STEM-HAADF), and X-ray Photoelectron Spectroscopy (XPS).
  • Density Functional Theory (DFT) calculations to understand the reaction mechanism at the atomic level.

Main Results:

  • Successful recovery of cadmium metal from cadmium sulfide within 3 hours.
  • Achieved a total recovery efficiency of 88% for cadmium.
  • DFT calculations and experimental characterizations confirmed selective dissolution of specific CdS crystal planes.

Conclusions:

  • A facile and effective room-temperature method for recycling cadmium from CdS has been demonstrated.
  • This approach offers a significant improvement over conventional methods for treating cadmium-based semiconductor waste.
  • The study paves the way for sustainable cadmium metal recovery and waste management.