Mesoporous Organic Material Uranium Extraction Phosphoric Acid
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Solution Overview
Problem
Current methods for extracting uranium(VI) from aqueous solutions of phosphoric acid, particularly those derived from the sulphuric attack of natural phosphates, face challenges such as low extraction capacity and lack of selectivity when phosphoric acid concentrations exceed 1 mol/L, and are not effectively suited for recovering uranium at low concentrations in complex solutions.
Innovation Solution
A mesoporous organic material is developed through cross-linking polymerization of amidophosphonate or amidophosphonic bifunctional compounds, which provides high extraction capacity and selectivity for uranium(VI) over iron, even at high phosphoric acid concentrations, utilizing a specific monomer structure and cross-linking process to create a material with a high mesopore volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional extraction materials are used, then the extraction process is simple, but the extraction capacity and selectivity are low when phosphoric acid concentrations exceed 1 mol/L
Solution Approach 1:
The patent employs a mesoporous polymer bead structure with controlled pore sizes (2-50 nm) and high surface area (50-500 m²/g). The porous architecture provides extensive surface area for uranium(VI) interaction while maintaining ease of use in liquid-solid extraction. The mesoporous structure allows efficient diffusion of uranium species to active extraction sites throughout the bead interior, significantly enhancing extraction capacity compared to conventional non-porous materials.
Solution Approach 2:
The invention creates a composite material by functionalizing polymer beads with amidophosphonate or amidophosphonic groups. This composite structure combines the mechanical stability and porosity of the polymer support with the high selectivity and binding affinity of amidophosphonate functional groups for uranium(VI). The composite nature enables simultaneous achievement of high extraction capacity and selectivity in phosphoric acid media.
2Device complexity
If conventional extraction materials are used, then the material structure is simple, but the selectivity for uranium(VI) over iron is insufficient
Solution Approach 1:
The patent applies local quality by introducing specific amidophosphonate functional groups at defined locations on the polymer bead surface and within the pore structure. These localized functional groups provide high selectivity for uranium(VI) through specific chemical interactions, while the rest of the polymer matrix provides structural support and porosity. This localized functionalization achieves high selectivity without requiring complex overall material structures.
Solution Approach 2:
The invention utilizes parameter changes by adjusting the pH of the phosphoric acid solution to optimize uranium(VI) extraction. The amidophosphonate functional groups exhibit pH-dependent binding behavior, with enhanced selectivity for uranium(VI) over iron at specific pH ranges. By controlling the pH parameter, the material achieves high selectivity without requiring complex structural modifications.
3Quantity of substance
If extraction capacity is increased, then more uranium(VI) can be recovered, but the cost and complexity of material synthesis increases
Solution Approach 1:
The patent applies preliminary action by pre-synthesizing polymer beads with controlled mesoporous structures and defined functional group densities before uranium extraction. The polymerization process incorporates amidophosphonate monomers along with porogenic agents to create the desired porous architecture and functionalization in a single preparatory step. This preliminary structuring enables high extraction capacity without requiring complex post-processing or multi-step synthesis procedures.
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 mesoporous organic material demonstrates a significantly higher uranium(VI) extraction capacity and selectivity compared to existing materials, maintaining performance across a wide range of phosphoric acid concentrations and effectively removing uranium(VI) from solutions containing iron, with the ability to be stripped and reused.
Implementation Method 1
contacting the aqueous solution of phosphoric acid with an organic or inorganic solid material, that is insoluble in water and is functionalised by chemical groups capable of extracting uranium(VI) from the aqueous solution, either by ion exchange or by complexation
Implementation Method 2
cross-linking polymerization of amidophosphonate or amidophosphonic bifunctional compounds
Implementation Method 3
a mesoporous organic material obtainable by a cross-linking polymerisation of a monomer of formula (I)... which provides high extraction capacity and selectivity
Data Source
AI summary
A mesoporous organic material which makes it possible to extract, using the liquid-solid extraction technique, the uranium(VI) contained in an aqueous medium including phosphoric acid, with high efficiency and high selectivity for the iron that the medium can likewise contain. The material is likely to be obtained by cross-linking polymerisation of a monomer of formula (I) below, wherein: R1, R2 and R3 are, independently from one another, H, a C1 to C12 saturated or unsaturated, linear or branched hydrocarbon group, or a polymerisable group, with the condition that at least one of R1, R2 and R3 is a polymerisable group; R4 and R5 are, independently from one another, H or a C1 to C8 saturated or unsaturated, linear or branched hydrocarbon group; the cross-linking polymerisation being carried out in the presence of a cross-linking agent and one or more pore-forming agents.