Two-Dimensional Chalcogenide for Stable Iodine Vapor Adsorption
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Solution Overview
Problem
Current methods for removing gaseous radioactive iodine, such as silver-based zeolites and triethylenediamine-impregnated activated carbon, face issues of instability, high cost, and safety hazards, while metal-organic frameworks are limited by high organic ligand costs, making them unsuitable for efficient and stable iodine vapor removal.
Innovation Solution
A two-dimensional chalcogenide material (NH4)2[Sn3S7]·(C4H13N3)1.41 is synthesized, which reduces I2 to I− and then reacts with Sn4+ to form stable SnI4, achieving high adsorption capacity and stability across a wide temperature range without iodine desorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silver-based zeolite is used for iodine removal, then removal rate is improved, but cost and environmental pollution worsen
Solution Approach 1:
The patent replaces expensive silver-based zeolite with a cheaper alternative adsorbent material that can achieve comparable iodine removal performance. The new material uses inexpensive components and simpler synthesis procedures, making it economically viable for large-scale application while maintaining effective radioactive iodine capture.
Solution Approach 2:
The patent modifies the chemical composition and structural parameters of the adsorbent material by changing from silver-containing zeolite to a different chemical system with optimized pore structure and surface properties. This parameter change enables effective iodine adsorption through alternative mechanisms while eliminating the need for costly silver components.
2Quantity of substance
If triethylenediamine-impregnated activated carbon is used, then adsorption capacity is improved, but stability and safety worsen
Solution Approach 1:
The patent replaces organic amine impregnants with inorganic or thermally stable alternative materials that do not decompose or sublime under operating conditions. This substitution eliminates the stability issues associated with organic amines while maintaining or improving adsorption capacity through different binding mechanisms.
Solution Approach 2:
The patent changes the chemical nature of the adsorbent from organic-impregnated carbon to a material with inorganic or thermally stable composition. This parameter change in chemical stability ensures the adsorbent maintains its structural integrity and adsorption performance under varying temperature and ambient conditions without decomposition or sublimation.
3Reliability
If metal-organic frameworks are used, then adsorption performance is improved, but cost worsens
Solution Approach 1:
The patent replaces expensive organic ligands in metal-organic frameworks with inexpensive inorganic or simple organic compounds. The new adsorbent achieves comparable or superior performance using readily available, low-cost materials, eliminating the economic barrier to large-scale deployment of framework-based adsorbents.
Solution Approach 2:
The patent transitions from complex metal-organic framework structures with expensive ligands to a simplified adsorbent system with different chemical composition and structure. This parameter change in material composition maintains the desired adsorption performance while dramatically reducing the cost of raw materials and synthesis.
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 chalcogenide material exhibits high iodine vapor adsorption capacity (up to 2.12 g/g at 75°C) and stability over time, offering a cost-effective solution for industrial radioactive iodine removal.
Implementation Method 1
A two-dimensional chalcogenide material (NH4)2[Sn3S7]·(C4H13N3)1.41 is synthesized, which reduces I2 to I− and then reacts with Sn4+ to form stable SnI4
Data Source
AI summary
The invention provides a two-dimensional chalcogenide, which is a crystalline material, and has a chemical formula of (NH4)2[Sn3S7]·(C4H13N3)1.41, cell parameters of a=b=13.2307(10) Å, c=19.335(2) Å, α=β=90°, and γ=120°, and space group of P63/mmc. The invention further provides a method for preparing the two-dimensional chalcogenide and use thereof in the adsorption of iodine vapor. The two-dimensional chalcogenide of the present invention is capable of removing iodine vapor of various concentrations (as low as 400 ppm) over a wide range of temperatures (25° C.-75° C.), without desorption of iodine after standing for a long time.