GOLD FROM E-WASTE

NEWS: Researchers have developed a new method to recover gold from electronic waste (e-waste) using modified rice paper.

CONTEXT

  • Uses a chemically treated starch-based rice paper that can selectively extract gold from complex electronic waste solutions.
  • Considered cost effective, environmentally friendly, and useful for recycling valuable metals from discarded electronic devices.

Background

  • Electronic waste (E-waste)à Discarded electronic devices such as computers, mobile phones, televisions, circuit boards, and other electronic equipment.
  • E-waste contains valuable metals such as gold, silver, copper, palladium, and platinum.
  • Recovering these metals reduces the need for mining and helps conserve natural resources.
  • Traditional metal recovery methods often involve hazardous chemicals and generate pollution

Rice Paper

  • Rice paper is a thin edible material commonly used in food preparation.
  • It is primarily made from starch-based compounds.
  • Researchers modified this paper to make it capable of selectively capturing gold from waste solutions.

How Does the Technology Work?

  • Electronic wasteà First dissolved into a liquid solution containing various metal ions.
  • The modified rice paper is then placed into this solution.
  • The paper selectively attracts gold ions while ignoring many other metals.
  • Once attached to the paper, the gold ions are chemically reduced into solid gold nanoparticles.
  • These nanoparticles accumulate on the surface of the paper.
  • The paper can later be burned, leaving behind pure metallic gold for collection

SIGNIFICANCE

  • Provides a sustainable method for recovering valuable metals from ewaste.
  • Reduces environmental pollution associated with conventional extraction methods.
  • It promotes the circular economy by recovering and reusing precious resources.
  • Can reduce dependence on mining activities.
  • Helps address the growing challenge of e-waste management.

India and E-Waste

  • India is among the world's largest generators of electronic waste.
  • The government regulates e-waste management through the E-Waste (Management) Rules, 2022.
  • These rules are based on the principle of Extended Producer Responsibility (EPR).
  • Under EPR, manufacturers are responsible for collecting and recycling end-of-life electronic products.
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