Related Experiment Video
Updated: Feb 10, 2026

Preparing Silica Aerogel Monoliths via a Rapid Supercritical Extraction Method
Published on: February 28, 2014
Silver-functionalized silica aerogels and their application in the removal of iodine from aqueous environments
R Matthew Asmussen1, Josef Matyáš1, Nikolla P Qafoku1
1Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA, 99352, USA.
Abstract:
One of the key challenges for radioactive waste management is the efficient capture and immobilization of radioiodine, because of its radiotoxicity, high mobility in the environment, and long half-life (t1/2 = 1.57 × 107 years). Silver-functionalized silica aerogel (AgAero) represents a strong candidate for safe sequestration of radioiodine from various nuclear waste streams and subsurface environments. Batch sorption experiments up to 10 days long were carried out in oxic and anoxic conditions in both deionized water (DIW) and various Hanford Site Waste Treatment Plant (WTP) off-gas condensate simulants containing from 5 to 10 ppm of iodide (I-) or iodate (IO3-). Also tested was the selectivity of AgAero towards I- in the presence of other halide anions. AgAero exhibited fast and complete removal of I- from DIW, slower but complete removal of I- from WTP off-gas simulants, preferred removal of I- over Br- and Cl-, and it demonstrated ability to remove IO3- through reduction to I-.
Related Concept Videos
Chemical Reactions in Aqueous Solutions
Aqueous Solutions and Heats of Hydration
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
Applications of Integration to Probability Density Functions
Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene
Silica Gel Column Chromatography: Overview
Polar components tend to bind strongly to the silica gel, causing them to move slowly through the column. In contrast, nonpolar compounds...
Gene-Environment Interactions

