Separation of Gold from Other Noble Metals Using Acrylic-Acid-Based Cryogels.

Area of Science:

• Materials Science
• Environmental Chemistry
• Metallurgy

Background:

• Noble metal recovery from waste is crucial for resource sustainability.
• Existing methods for separating gold from platinum group metals are challenging due to similar chemical properties.
• Adsorption offers a simple and selective approach for metal recovery.

Purpose of the Study:

• To develop an easy and selective method for gold recovery from mixed-metal solutions.
• To utilize cryogel adsorbents synthesized via cryopolymerization for this purpose.
• To demonstrate the effectiveness of the method for industrial wastewater and electronic waste.

Main Methods:

• Synthesis of macroporous cryogels from acrylic monomer solutions.
• Utilizing the cryogels' structure for selective adsorption of gold.
• Testing the adsorbent's performance with mixed-metal solutions containing gold, palladium, platinum, ruthenium, rhodium, and iridium.

Main Results:

• The cryogels exhibited high selectivity for gold recovery, even in the presence of challenging metals like palladium and platinum.
• The method allows direct use of industrial wastewater without pH adjustment or reductants.
• The adsorbent's macroporous structure facilitated fast swelling and high water content across various pH levels.

Conclusions:

• Cryogel adsorbents provide an efficient and scalable solution for selective gold recovery.
• This method simplifies precious metal recycling by eliminating the need for extensive pretreatment.
• The developed technique offers a promising advancement for sustainable noble metal management.