Scholarlink

<p>Printed circuit boards (PCB) are one of the complex materials containing many precious materials such as copper (Cu), gold (Au), and silver (Ag) along with toxic materials too. PCB on dead use becomes E-waste which randomly dumped in environment with its value and toxicity, which need to be handled cautiously. In this work Cu, Au, and Ag were extracted from the waste printed circuit board (WPCB) by environmentally safe&#xa0;hydrometallurgical method where pulverized WPCB was leached with 2M H<sub>2</sub>SO<sub>4</sub>. The leachate was divided into 2 halves for selective precipitation of&#xa0;Cu with iron powder and&#xa0;green solvent, thiourea&#xa0;followed with NaBH<sub>4</sub>&#xa0;treatment for Au–Ag thiourea green complexation. The purity and structural details of Cu and Au–Ag thiourea precipitate were studied by different techniques such as X-ray diffraction (XRD), Ultraviolet–visible (UV–Vis) spectroscopy, and Scanning electron microscopy (SEM) equipped with the energy-dispersive X-ray (EDX) analysis. The result showed excellent crystalline structure indicating its high&#xa0;purity for Cu powder whereas semi-crystalline porous structure&#xa0;for Au–Ag thiourea is&#xa0;dark-green complex. This work concludes the&#xa0;extraction of Cu, Au and Ag from WPCB board using comparatively green chemicals iron powder and, thiourea and&#xa0;proven to be pure by spectroscopic and microscopic techniques to bring back into circular economy.</p> Graphical abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Spectroscopic and microscopic investigations for precious metals extracted from complex waste printed circuit board (WPCB)

  • 期刊论文

  • 发表日期：

    2025年6月30日

查看全文
  • Jyoti Giri,
  • Rakesh Das,
  • Ramesh Puri,
  • Rameshwar Adhikari

摘要

Printed circuit boards (PCB) are one of the complex materials containing many precious materials such as copper (Cu), gold (Au), and silver (Ag) along with toxic materials too. PCB on dead use becomes E-waste which randomly dumped in environment with its value and toxicity, which need to be handled cautiously. In this work Cu, Au, and Ag were extracted from the waste printed circuit board (WPCB) by environmentally safe hydrometallurgical method where pulverized WPCB was leached with 2M H2SO4. The leachate was divided into 2 halves for selective precipitation of Cu with iron powder and green solvent, thiourea followed with NaBH4 treatment for Au–Ag thiourea green complexation. The purity and structural details of Cu and Au–Ag thiourea precipitate were studied by different techniques such as X-ray diffraction (XRD), Ultraviolet–visible (UV–Vis) spectroscopy, and Scanning electron microscopy (SEM) equipped with the energy-dispersive X-ray (EDX) analysis. The result showed excellent crystalline structure indicating its high purity for Cu powder whereas semi-crystalline porous structure for Au–Ag thiourea is dark-green complex. This work concludes the extraction of Cu, Au and Ag from WPCB board using comparatively green chemicals iron powder and, thiourea and proven to be pure by spectroscopic and microscopic techniques to bring back into circular economy.

Graphical abstract