Silver-Loaded Aluminosilicate Aerogels As Iodine Sorbents

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Engineering

Background:

• Aluminosilicate aerogels offer a versatile scaffold for nanomaterial integration.
• Silver nanoparticles are known for their reactivity and potential in gas capture applications.

Purpose of the Study:

• To develop and characterize silver-functionalized aluminosilicate aerogels for iodine gas capture.
• To investigate the effect of aerogel composition and surface modification on silver loading and iodine adsorption capacity.

Main Methods:

• Synthesis of Na-Al-Si-O and Al-Si-O aerogels from metal alkoxides.
• Impregnation of aerogels with silver nitrate followed by reduction to form silver nanoparticles.
• Thiolation of aerogels using 3-(mercaptopropyl)trimethoxysilane to enhance silver binding.
• Characterization of silver loading and iodine capture capacity of the functionalized aerogels.

Main Results:

• Comparable high silver loading (~35 atomic %) achieved in both thiolated and non-thiolated Na-Al-Si-O aerogels.
• Significantly lower silver loading (~7 atomic %) in unthiolated Al-Si-O aerogels.
• High iodine loadings (>0.5 mg I/mg sorbent) observed in Ag-functionalized Na-Al-Si-O aerogels, indicating efficient chemisorption to form AgI.
• Iodine loading of 0.31 mg I/mg sorbent in thiolated Ag-functionalized Al-Si-O aerogels.
• Demonstrated ability to control silver loading and thus iodine capacity by adjusting solution parameters.

Conclusions:

• Silver-functionalized aluminosilicate aerogels are effective sorbents for iodine gas.
• Surface modification (thiolation) and aerogel composition significantly influence silver loading and iodine capture efficiency.
• The developed materials offer tunable capacities for iodine adsorption, with potential applications in gas purification and storage.