Ionic Gel Decontaminates Porous Surfaces Without Abrasion
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Solution Overview
Problem
Current methods for decontaminating porous surfaces contaminated with radioactive materials, such as those from a dirty bomb, are either destructive or produce significant radioactive waste, lacking non-destructive and efficient solutions for large-scale decontamination.
Innovation Solution
A method involving an ionic wash solution and a gel-like media containing nano-microcrystalline silicotitanates is applied to porous surfaces, solubilizing radionuclides and binding them to the gel for removal without mechanical alteration, using ammonium ions and a radionuclide chelator to create a continuous concentration gradient for passive decontamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical removal or ablation methods are used to decontaminate porous surfaces, then decontamination effectiveness is improved, but surface integrity is destroyed and large amounts of radioactive waste are generated
Solution Approach 1:
The patent replaces mechanical removal methods with a chemical chelation system. The gel-containing chelating agent binds to radionuclides through chemical affinity, allowing removal without mechanical force. This substitution eliminates the need for ablation or grinding while achieving effective decontamination, thereby preserving surface integrity.
Solution Approach 2:
The patent introduces a gel-containing chelating agent as an intermediary substance between the contaminated surface and the removal process. This intermediary binds to radionuclides through chelation, facilitating their extraction from the porous surface without direct mechanical contact. The gel matrix serves as a carrier that enables selective binding and subsequent removal of contaminants.
2Reliability
If washing with copious amounts of water is used, then some contamination is removed from the surface, but copious amounts of radioactive waste water are produced requiring recovery
Solution Approach 1:
The patent enables recovery and reuse of the decontamination media. The gel-containing chelating agent can be applied, allowed to bind to radionuclides, and then removed and reused for subsequent decontamination cycles. This eliminates the need to discard large volumes of contaminated water, as the chelating agent concentrates contaminants in a reusable form.
Solution Approach 2:
The patent changes the physical and chemical parameters of the decontamination process by using a gel-based chelating system instead of bulk water washing. The gel matrix provides a high surface area for chelation while maintaining a manageable volume, converting the waste water problem into a concentrated contaminant binding problem that can be addressed with smaller, reusable media quantities.
3Reliability
If chelating agents are added to wash water, then some radionuclide contamination is removed, but contamination may ingress deeper into the pore structure
Solution Approach 1:
The patent applies the chelating agent locally in the form of a gel on the surface rather than circulating it through the porous structure. The gel provides a localized chelation zone at the surface where radionuclides are bound, preventing them from penetrating deeper into the pores. This localized application maintains high removal efficiency while avoiding the harmful effect of promoting deep ingress.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively removes radioactive contaminants from surfaces like concrete without generating copious waste, allowing for efficient decontamination of large areas and potential recycling of the decontamination media, applicable to various porous and non-porous materials.
Implementation Method 1
contacting the contaminated porous surfaces with an ionic solution capable of solubilizing radionuclides present in the porous surfaces
Implementation Method 2
contacting the solubilized radionuclides with a gel containing a radionuclide chelator to bind the radionuclides to the gel
Implementation Method 3
forming a hydrogel by adding in one or more steps a dry mix of a cross-linked ionic polymer salt, a linear ionic polymer salt, a radionuclide chelator, and adding a gel formation controller
Data Source
AI summary
A method of decontaminating porous surfaces contaminated with water soluble radionuclides by contacting the contaminated porous surfaces with an ionic solution capable of solubilizing radionuclides present in the porous surfaces followed by contacting the solubilized radionuclides with a gel containing a radionuclide chelator to bind the radionuclides to the gel, and physically removing the gel from the porous surfaces. A dry mix is also disclosed of a cross-linked ionic polymer salt, a linear ionic polymer salt, a radionuclide chelator, and a gel formation controller present in the range of from 0% to about 40% by weight of the dry mix, wherein the ionic polymer salts are granular and the non cross-linked ionic polymer salt is present as a minor constituent.