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Selective adsorbent for caesium and preparation method of selective adsorbent

An adsorbent and selective technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, radioactive purification, etc., can solve problems such as being unsuitable for fixed bed operation, and achieve good adsorption effect, high selectivity, and large adsorption capacity. Effect

Inactive Publication Date: 2016-06-22
NAVAL UNIV OF ENG PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of existing cesium selective inorganic ion exchangers that are not suitable for fixed bed operation, and provide a cesium ion exchanger with strong selectivity for cesium in radioactive wastewater under the premise of ensuring high adsorption capacity and selectivity. Selective adsorbent and its preparation method

Method used

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  • Selective adsorbent for caesium and preparation method of selective adsorbent
  • Selective adsorbent for caesium and preparation method of selective adsorbent
  • Selective adsorbent for caesium and preparation method of selective adsorbent

Examples

Experimental program
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Effect test

Embodiment 1

[0025] (a) Dissolve 15.5g of nickel sulfate and 12.66g of potassium ferrocyanide in 100mL and 50mL of deionized water, respectively, and continue to stir and react under ice bath conditions. After the precipitation is complete, let it stand for 12 hours, and then separate it by centrifugation. After fully washing with deionized water, dry at 70°C to obtain potassium nickel ferrocyanide, and grind it into a fine powder;

[0026] (b) Disperse 4.4 g of the prepared potassium nickel ferrocyanide powder evenly in 125 mL of acetic acid (1%) solution with a chitosan concentration of 3.5% (mass concentration). The mixed solution was ultrasonically treated for 10 minutes to fully dissolve the chitosan, and stirred at room temperature for 2 hours to obtain the water phase required by the reverse suspension method;

[0027] (c) Measure 130ml of aviation kerosene, add 0.8mL of Span 80, and stir well to obtain the oil phase required by the inverse suspension method.

[0028] (d) At a wate...

Embodiment 2

[0033] Get the chitosan-potassium ferrocyanide nickel-cesium selective adsorbent 0.01g obtained in Example 1, and treat Cs with constant temperature oscillation at 30° C. + A solution with an initial concentration of 10mg / L. Table 1 is solution Cs + Residual concentration, adsorbent adsorption Cs + Quantities change over time.

[0034] Table 1 The effect of adsorption time on the adsorption of Cs by chitosan-nickel potassium ferrocyanide + Impact

[0035] time (h)

[0036] The data in Table 1 show that the adsorption rate gradually decreases with the increase of adsorption time. The adsorption amount changes little after about 5 hours, and the adsorbent tends to be saturated to reach adsorption equilibrium, and the equilibrium adsorption capacity is about 37mg / L.

Embodiment 3

[0038] Adopt the method identical with embodiment 2 to process containing Cs + For the aqueous solution, the adsorption time was uniformly 7h, and the pH value of the solution was changed. The experimental results are shown in Table 2.

[0039] Table 2 pH value on the adsorption of Cs by chitosan-nickel potassium ferrocyanide + Impact

[0040]

[0041]

[0042] The data in Table 2 show that the adsorption capacity of chitosan-nickel potassium ferrocyanide increases with the increase of pH, but the change range is not large. The pH range with the best adsorption effect is 7~9. The adsorption capacity is 36.65mg / L~37.72mg / L.

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Abstract

The invention provides a cesium selective adsorbent and a preparation method thereof. The method comprises the following steps: (a) uniformly dispersing inorganic ion exchanger powder in a chitosan solution to obtain an aqueous phase required by a reverse suspension method; (b) add emulsifier in aviation kerosene, obtain the required oil phase of inverse suspension method after fully stirring; (c) mix the water phase and oil phase that step (a) and step (b) obtain, in water-bath condition After stirring and dispersing for 3-5 hours, quickly pour into the coagulation bath, after stirring and layering, fully clean the gel microspheres at the bottom of the solution; (d) mix the gel microspheres and crosslinking agent obtained in step (c) performing a cross-linking reaction, washing and drying the cross-linked microspheres to obtain the cesium selective adsorbent. The cesium selective adsorbent prepared by the present invention has good adsorption effect, ＋ It has high selectivity and large adsorption capacity.

Description

technical field [0001] The invention relates to the field of radioactive waste liquid treatment, in particular to a cesium selective adsorbent and a preparation method thereof. Background technique [0002] During the construction, testing, operation, maintenance, and decommissioning of nuclear power plants, a large amount of radioactive wastewater will be generated. If the wastewater is discharged directly, the radionuclides contained in it will migrate through water and soil, threatening human health and the environment. Safety. Therefore, properly, economically and effectively completing the treatment of radioactive wastewater plays an important role in promoting the development of the nuclear industry and promoting the use of nuclear energy. [0003] Generally speaking, in the process of radioactive wastewater treatment, the radionuclide is mainly separated and extracted from the wastewater by various methods, then solidified, and disposed of for a long time to isolate ...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F1/62G21F9/12C02F101/20
CPCB01J20/267B01J20/02B01J2220/46C02F1/28C02F1/62C02F2101/20G21F9/12
Inventor 梁成强贾铭椿杜志辉王晓伟门金凤
Owner NAVAL UNIV OF ENG PLA
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