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Method used for separation and enrichment of thorium at high acidity with phosphonic acid group-containing chelated resin

A chelating resin and phosphonic acid-based technology, which is applied in chemical instruments and methods, water/sludge/sewage treatment, water pollutants, etc., can solve the problems affecting the adsorption capacity of thorium and the limited number of functional groups, and achieve fast adsorption speed , The preparation method is simple and the effect of less by-products

Active Publication Date: 2019-01-11
EAST CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of these functional groups are introduced by post-grafting, but the number of functional groups introduced by this method is extremely limited, which greatly affects the adsorption capacity of these materials for thorium under high acidity.

Method used

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  • Method used for separation and enrichment of thorium at high acidity with phosphonic acid group-containing chelated resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Chelating resin containing phosphonic acid group can be prepared by solvothermal method, as a typical synthetic example: 0.5g hydrogen phosphate di(methacryloyloxyethyl) ester and 0.05g azobisisobutyronitrile are added in 5ml tetrahydrofuran , stirred at 25°C for 1h, added the above solution into a hydrothermal reaction kettle, reacted at 100°C for 24h, took it out, opened the kettle, removed ethyl acetate by rotary evaporation, and dried in vacuum at 45°C for 12h to obtain the phosphine-containing Acid-based chelating resin1.

Embodiment 2

[0034] Chelating resin containing phosphonic acid group can be prepared by solvothermal method, as a typical synthetic example: 0.5g hydrogen phosphate bis(methacryloyloxyethyl) ester and 0.05g azobisisobutyronitrile are added in 5ml acetone , stirred at 25°C for 1h, added the above solution into a hydrothermal reaction kettle, reacted at 100°C for 24h, took it out, opened the kettle, removed ethyl acetate by rotary evaporation, and dried in vacuum at 45°C for 12h to obtain the phosphine-containing Acid-based chelating resin2.

Embodiment 3

[0036] Accurately pipette 25mL, 100mg / L thorium standard solution into a 150mL Erlenmeyer flask, use 12mol / L nitric acid, 1mol / L NaOH solution and 5mol / L NaOH solution to adjust the uranium solution H + concentration, so that the solution H + The concentration is 4mol / L. Add 0.010 g of adsorbent 1, and adsorb for 3 hours at 25 ° C, 135 r / min constant temperature oscillator. Separation by filtration, spectral analysis by ICP-OES, measurement of the concentration of thorium ions in the filtrate, and calculation of the adsorption capacity at this time by formula (1) is 59.5 mg / g.

[0037] The adsorption amount of thorium ions is calculated according to the following formula:

[0038]

[0039] In the formula: q e - adsorption capacity, mg / g; V - volume of solution, L; C e - Equilibrium concentration of thorium ion solution, mg / L; C 0 - initial concentration of thorium ion solution, mg / L; m - mass of adsorbent, g.

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Abstract

The invention relates to a phosphonic acid group-containing chelated resin, and a polymer adsorbent prepared from bis(2-methacryloxyethyl) phosphate through solvent thermal polymerization. A preparation method comprises following steps: 0.5 to 2g of bis(2-methacryloxyethyl) phosphate and 0.05g of azodiisobutyronitrile are added into 1 to 15ml of an organic solvent, an obtained mixture is stirred for 1 to 3h at 25 DEG C, an obtained solution is introduced into a hydro-thermal reaction vessel, reaction is carried out for 24h at 100 DEG C, an obtained product is taken out from the hydro-thermal reaction vessel, is subjected to rotary evaporation to remove the organic solvent, and is subjected to vacuum drying for 12 to 24h at 45 DEG C so as to obtain the phosphonic acid group-containing chelated resin. The invention also discloses a method used for separation and enrichment of thorium at a high acidity with the phosphonic acid group-containing chelated resin. According to the method, theH<+> concentration of a thorium-containing aqueous solution to be processed is adjusted to 1 to 8mol / L, the phosphonic acid group-containing chelated resin is added, shaking is carried out, and absorption is carried out. The phosphonic acid group-containing chelated resin is simple in the preparation method; operation is convenient; few by-products are produced; and the phosphonic acid group-containing chelated resin can be recycled.

Description

technical field [0001] The invention relates to the technical field of thorium adsorption, in particular to a chelating resin containing phosphonic acid groups and a method for separating and enriching thorium under high acidity. Background technique [0002] Nuclear power generation has become the protagonist of new energy due to its economy, cleanliness and high efficiency. Uranium is an important nuclear fuel resource, but my country's uranium resources are relatively scarce, and it is difficult to meet the needs of future nuclear power development. Thorium is the other most important nuclear energy resource besides uranium, and my country's proven thorium resource reserves occupy the second place in the world. need. At the same time, during the development and utilization of thorium resources, radioactive waste water containing thorium will be produced, seriously polluting the ecological environment. Whether it is from the development and utilization of thorium resourc...

Claims

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Application Information

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IPC IPC(8): B01J20/30C02F1/28B01J20/26C02F101/20
CPCB01J20/262C02F1/285C02F2101/20
Inventor 袁定重张庆华张世傲陈林隆王云何妍孔令会
Owner EAST CHINA UNIV OF TECH
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