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<p>Spent Ni-Cd batteries are hazardous due to their high cadmium content. Herein, a facile green method was proposed to convert this toxic waste into CdS nanoparticles, a high-added-value material. CdS nanoparticles were prepared by chemical precipitation of cadmium solution obtained from the leaching of spent Ni-Cd batteries by glycine. Glycine served both as a lixiviant in leaching and as a capping agent during CdS precipitation. The effect of glycine concentration on the properties of CdS nanoparticles was studied using FTIR, XRD, HR-TEM, FESEM-EDS, and UV-Vis. Results indicated that glycine inhibited particle growth and agglomeration, producing nanoparticles with an average particle size of 12.9&#xa0;nm. As glycine concentration increased from 0 to 1&#xa0;M, the crystal structure transformed from hexagonal to cubic, and the average crystallite size decreased from 4.7&#xa0;nm to 1.9&#xa0;nm. A blue shift in the UV-Vis absorption spectrum of CdS nanoparticles was observed with increasing glycine concentration due to the quantum confinement effects with the band gap energy of the CdS nanoparticle increasing from 2.75&#xa0;eV to 3.04&#xa0;eV.</p>

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Facile Green Synthesis of CdS Nanoparticles in a Glycine Medium for Waste Valorization of Ni-Cd Battery

  • 期刊论文

  • 发表日期：

    2025年4月10日

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  • Aysan Azmand,
  • Sadegh Firoozi,
  • Davoud Fatmehsari Haghshenas

摘要

Spent Ni-Cd batteries are hazardous due to their high cadmium content. Herein, a facile green method was proposed to convert this toxic waste into CdS nanoparticles, a high-added-value material. CdS nanoparticles were prepared by chemical precipitation of cadmium solution obtained from the leaching of spent Ni-Cd batteries by glycine. Glycine served both as a lixiviant in leaching and as a capping agent during CdS precipitation. The effect of glycine concentration on the properties of CdS nanoparticles was studied using FTIR, XRD, HR-TEM, FESEM-EDS, and UV-Vis. Results indicated that glycine inhibited particle growth and agglomeration, producing nanoparticles with an average particle size of 12.9 nm. As glycine concentration increased from 0 to 1 M, the crystal structure transformed from hexagonal to cubic, and the average crystallite size decreased from 4.7 nm to 1.9 nm. A blue shift in the UV-Vis absorption spectrum of CdS nanoparticles was observed with increasing glycine concentration due to the quantum confinement effects with the band gap energy of the CdS nanoparticle increasing from 2.75 eV to 3.04 eV.