Silver-Modified Silicotitanate Adsorbent for Multi-Ion Removal
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Solution Overview
Problem
Current materials are unable to simultaneously adsorb cesium, strontium, and iodide ions from aqueous solutions, which are often present in polluted water, seawater, and groundwater.
Innovation Solution
A composition comprising silver and crystalline silicotitanate, specifically with a sitinakite structure, is developed to adsorb cesium, strontium, and iodide ions simultaneously. The silver content is between 0.3% and 20% by mass, and at least part of the silver is present in the ion-exchange sites of the crystalline silicotitanate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If crystalline silicotitanate is used as an adsorbent for cesium and strontium ions, then cesium and strontium ions can be removed from aqueous solutions, but iodide ions cannot be adsorbed simultaneously
Solution Approach 1:
The patent combines crystalline silicotitanate (which adsorbs cesium and strontium ions) with silver (which adsorbs iodide ions) to create a composite material that simultaneously removes all three ions from aqueous solutions. This merging of two materials with different adsorption specificities resolves the contradiction by enabling multi-ion adsorption capability while maintaining selectivity for each ion type through the specific properties of the constituent materials.
Solution Approach 2:
The composite material achieves multi-functionality by integrating the adsorption properties of crystalline silicotitanate for cesium and strontium with the adsorption properties of silver for iodide. The resulting material can simultaneously perform multiple adsorption functions in a single process, making it universally applicable for removing diverse hazardous ions from water without requiring separate treatment steps.
2Adaptability or versatility
If multiple adsorbents are used to remove different ions, then comprehensive ion removal can be achieved, but the complexity of the treatment system increases
Solution Approach 1:
The patent merges multiple adsorbent materials (crystalline silicotitanate and silver) into a single composite material that performs the functions of multiple separate adsorbents. This consolidation reduces system complexity by eliminating the need for multiple separate treatment stages or multiple different materials, while still achieving comprehensive ion removal for cesium, strontium, and iodide.
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
The composition effectively adsorbs cesium, strontium, and iodide ions with high selectivity, achieving distribution coefficients of 10,000 mL/g or more for iodine, thereby addressing the limitations of existing adsorbents.
Implementation Method 1
at least part of the silver is present in an ion-exchange site of the crystalline silicotitanate
Implementation Method 2
crystalline silicotitanate is known as an adsorbent with which hazardous ions can be removed from an aqueous solution
Implementation Method 3
a composition that includes silver and crystalline silicotitanate is capable of simultaneous adsorption of cesium, strontium and iodide ions
Data Source
AI summary
At least one of a composition including silver and crystalline silicotitanate to which cesium and strontium ions can be adsorbed and to which an iodide ion can also be adsorbed simultaneously and a method for producing the composition.