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Cs < + > and Sr < 2 + > co-adsorption-separation difunctional ion exchanger as well as preparation method and application thereof

An ion exchanger and co-adsorption technology, applied in cation exchange materials, ion-exchange water/sewage treatment, chemical instruments and methods, etc. Poor alkali tolerance and other problems, to achieve the effect of fast adsorption rate, sensitive pH sensitivity, strong acid-base tolerance

Active Publication Date: 2022-06-28
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such materials are not suitable for mixed Cs + 、Sr 2+ Ions exhibit a single co-adsorption or separation effect, and cannot combine both functions
However, the complex actual situation is very likely to require the material to switch between the two functions of co-adsorption and separation, which will inevitably involve changes or adjustments in equipment, technology, and process flow, resulting in increased energy consumption, working hours, and maintenance costs.
At the same time, these existing materials have the characteristics of low adsorption capacity, low selectivity, and poor acid-base tolerance to varying degrees, which hinder their practical application in radioactive waste treatment (Chem.Sci.2016,7(8 ),4804-4824)

Method used

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  • Cs &lt; + &gt; and Sr &lt; 2 + &gt; co-adsorption-separation difunctional ion exchanger as well as preparation method and application thereof
  • Cs &lt; + &gt; and Sr &lt; 2 + &gt; co-adsorption-separation difunctional ion exchanger as well as preparation method and application thereof
  • Cs &lt; + &gt; and Sr &lt; 2 + &gt; co-adsorption-separation difunctional ion exchanger as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Example 1 Preparation of K-SbS ion exchanger and product characteristics

[0075] like figure 1 As shown, 1.0 mmol of antimony powder, 4.0 mmol of sulfur powder, 8.0 mmol of isopropylamine hydrochloride, 16.0 mmol of urea and 12 mmol (about 0.6 mL) of hydrazine hydrate (98%) were thoroughly mixed, and then transferred to In a reaction kettle equipped with 20 mL of polytetrafluoroethylene lining, the reaction was heated at 180 ° C for 24 h. After the reaction was completed, it was naturally cooled to room temperature. NH 4 -SbS precursor; take 0.5g NH 4 -SbS precursor was added to 20mL potassium chloride solution (2M), after stirring at room temperature for 24h, the solid product was taken out by filtration, washed with 20mL water for 2 times, washed with 20mL ethanol for 2 times, and then naturally dried to obtain K-SbS ion exchanger , the calculated yield based on Sb was 86.5%.

[0076] Wherein, yield=(mass of obtained K-SbS ion exchanger sample / product molecular w...

Embodiment 2

[0085] Example 2K-SbS ion exchanger on single Cs + , Sr 2+ adsorption kinetics of ions

[0086] Take samples K-SbS and 6ppm containing single Cs + , Sr 2+ The aqueous solution of ions was mixed and stirred continuously for 8h at room temperature (20°C), V / m=1000mL g -1 , pH 6-7. A small amount of the mixture supernatant was taken at regular intervals, and after dilution, Cs was determined by ICP-MS. + , Sr 2+ ion concentration. Sampling NH under the same conditions 4 -SbS was tested as a reference. like Image 6 (a), Image 6 As shown in (b), the precursor NH 4 -SbS for Cs + , Sr 2+ The adsorption rate of ions is slow and the removal rate is low. At 480min, Cs + , Sr 2+ The removal rates were 79.4% and 11.5%, respectively. However, the adsorption speed of the activated K-SbS ion exchanger was significantly improved, and more than 93% of Cs could be removed within 2 min and 20 min, respectively. + and Sr 2+ ions, 40min to reach adsorption equilibrium, Cs at e...

Embodiment 3

[0087] Example 3K-SbS ion exchanger on single Cs + , Sr 2+ Ion adsorption isotherm

[0088] Take sample K-SbS with 2-769ppm of single Cs + or 3-776ppm of single Sr 2+ mixed with the aqueous solution, and continued stirring at room temperature (20 °C) for 8 h, V / m = 1000 mL g -1 , pH 6-7. The initial solution and the reacted supernatant were taken respectively, and the Cs were determined by ICP-MS after dilution. + , Sr 2+ ion concentration. Sampling NH under the same conditions 4 -SbS was tested as a reference. The experimental results are as Figure 7 (a), Figure 7 As shown in (b), the adsorption isotherm curve was fitted by the Langmuir-Frendlich model, NH 4 -SbS vs Cs + and Sr 2+ The saturated adsorption capacities of the ions were 70.96 and 49.48 mg g, respectively -1 , while the activated K-SbS ion exchanger has a great effect on Cs + and Sr 2+ The saturated adsorption capacity of ions has increased significantly, reaching 318.77 and 61.12 mg g, respectiv...

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Abstract

The invention relates to a Cs < + > and Sr < 2 + > co-adsorption-separation difunctional ion exchanger as well as a preparation method and application thereof. The molecular formula of the ion exchanger is K2Sb4S7. 2H2O; in the preparation method, Sb and S elementary substance are reacted by utilizing a eutectic solvothermal technology, and then hydrated K < + > ions are introduced into crystal lattices for activating treatment, so that the K2Sb4S7. 2H2O (K-SbS) ion exchanger which can be produced in batches and has excellent acid-base and irradiation tolerance is prepared; the exchanger respectively shows co-adsorption (pH 4-11) and separation (pH 2-3) functions on Cs < + > and Sr < 2 + > mixed ions under different solution acidity conditions, and the two functions can be repeatedly switched along with the change of pH. The K-SbS ion exchanger disclosed by the invention has the characteristics of large adsorption capacity, fast dynamic response, high separation coefficient and convenience in elution.

Description

Technical field: [0001] The invention belongs to the field of water treatment of cesium and strontium elements, and in particular relates to a solution pH control to realize the treatment of mixed Cs + , Sr 2+ An ion exchanger for ion co-adsorption-separation function conversion, its preparation method and its application. Background technique: [0002] Properly handling and disposing of radioactive waste and improving the emergency response capability for sudden nuclear pollution accidents are the key tasks in the implementation of nuclear safety and radioactive pollution prevention and control. in radionuclides 137 Cs(t 1 / 2 ~30.2 years, 100% beta decay, associated gamma ray energy E γ =661keV) and 90 Sr(t 1 / 2 = 28.8 years, 100% beta decay, E β =546keV) is a high-releasing thermal fission product generated during the operation of the reactor, often in the form of cations (Cs + , Sr 2+ ) exists in high-level radioactive waste, has strong radioactivity and biological...

Claims

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Application Information

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IPC IPC(8): B01J20/04B01J20/30B01J39/09C01G30/00C02F1/28C02F1/42G21F9/12C02F101/20C02F103/02C02F103/04
CPCB01J20/045C01G30/008B01J39/09C02F1/281C02F1/42G21F9/12C02F2101/20C02F2001/425C02F2103/02C02F2101/006C01P2002/72C01P2002/88C01P2002/80C01P2002/85C01P2004/03Y02P10/20
Inventor 王凯耀赵一鸣
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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