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Gel type iodine ion adsorbent and preparation method and application thereof

An iodide ion and gel-type technology, which is applied in separation methods, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problem that the brine iodine resources are not fully developed and utilized, the selectivity of the adsorbent is not high, and the adsorbent Regeneration is difficult and other problems, to achieve the effect of simple and efficient elution regeneration, unlimited iodine content, and low cost

Active Publication Date: 2013-05-01
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] CN200710306055.5 provides a process for extracting radioactive iodine from a nuclear reactor, using aluminum oxide or water and zirconia for adsorption, and desorbing with ammonia or sodium hydroxide; US Patent Application US005750461A proposes an iodine adsorbent for removing radioactivity Iodine, this type of iodine adsorbent uses organic porous solids to load elemental silver or silver salt, the disadvantage is that the regeneration of the adsorbent is difficult
[0007] In summary, the selectivity of the adsorbent is not high when aluminum oxide or water and zirconia are used to adsorb radioactive iodine; when ion-exchange resin Amberlyst 15 is used to adsorb iodine, since silver ions or mercury ions will be leached from the silver-loaded resin, The process also needs to remove silver or mercury; the acidification and oxidation processes in the ion exchange method and the air blowing method will change the components of the iodine-containing system, especially the air blowing method has higher requirements on the grade of the iodine source. Very suitable for brine systems with low iodine grade and complex composition
Iodine resources in brine have not been fully developed and utilized

Method used

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  • Gel type iodine ion adsorbent and preparation method and application thereof
  • Gel type iodine ion adsorbent and preparation method and application thereof

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preparation example Construction

[0025] figure 1 A flow chart of a method for preparing a gel-type iodide ion adsorbent according to an embodiment of the present invention is shown. It can be seen from the figure that the preparation method mainly includes two steps: first, γ-glycidyl etheroxypropyltrimethoxysilane is mixed with organic amine and alkaline aqueous solution to form a gel solution. Afterwards, the gel liquid is aged, washed with water, and dried to obtain a block-shaped gel-type iodide ion adsorbent.

[0026] The gamma-glycidyl etheroxypropyl trimethoxysilane has simple gel forming conditions, and can form a mixed gel with uniform structure and stable properties meeting the requirements of the present invention with organic amines.

[0027] Organic amines can provide the main functional groups for the adsorption of iodide ions. Therefore, any organic amine containing amine group, imine group or tertiary amino group can be used in the present invention, common industrial organic amine includes ...

Embodiment 1

[0042] γ-glycidyl etheroxypropyltrimethoxysilane, C 8-10 Trialkylamine (N235) and 0.02mol / L sodium hydroxide aqueous solution were mixed according to the volume ratio of 1:1:1, and the stirring was continued for 0.5 hours to form a uniform gel; the resulting gel was aged for 24 hours, washed with water, Dry at 40°C for 24 hours to obtain block gel.

[0043] Grind and sieve, take an adsorbent with a particle size of 20-60 mesh, use the adsorbent to adsorb iodide ions in an acidic solution (pH=2) containing iodide ions, and the adsorption capacity is 427mg / g.

[0044] With 0.01mol / L Na 2 CO 3 The aqueous solution is eluted according to the solid-to-liquid ratio of 1g:0.1L, and the elution rate is 100%. After elution, it is washed to neutrality before adsorption, and the re-adsorption capacity of iodide ion is 427mg / g.

[0045] When 1mol / L NaCl coexists in the adsorption solution (molar ratio Cl - / I - =500), the adsorption capacity of iodine is 224mg / g.

[0046] figure 2...

Embodiment 2

[0048] Mix γ-glycidyl etheroxypropyltrimethoxysilane, trioctylamine (N204), and 10mol / L ammonia solution in a volume ratio of 1:0.1:5, and keep stirring for 1 hour to form a uniform gel liquid; The resulting gel solution was aged for 5 hours, washed with water, and dried at 90° C. for 6 hours to obtain a block gel.

[0049] After grinding and sieving, the adsorbent is used to adsorb iodide ions in an acidic solution (pH=2), and the adsorption capacity is 352 mg / g.

[0050] With 0.005mol / L K 2 CO 3 The aqueous solution is eluted according to the solid-to-liquid ratio of 1g: 1L, and the elution rate is 100%. After elution, it is washed with water until it is neutral and then adsorbed. The re-adsorption capacity of iodide ion is 350mg / g.

[0051] When 1mol / L NaCl coexists in the adsorption solution (molar ratio Cl - / I - =500), the adsorption capacity of iodine is 190mg / g.

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Abstract

The invention relates to a preparation method of a gel type iodine ion adsorbent, which comprises the following steps: mixing gamma-glycidyl ether oxygen propyl trimethoxy silane with organic amine and alkaline aqueous solution to form gel, wherein the volume ratio of the gamma-glycidyl ether oxygen propyl trimethoxy silane, the organic amine and the alkaline aqueous solution is 1: (0.1-5): (0.2-5); and aging, washing and drying the gel to obtain the massy gel type iodine ion adsorbent. The preparation method has the advantages of simple process and low cost. The gel type iodine ion adsorbent prepared by the preparation method has the advantages of high adsorption capacity, good selectivity, and simplicity and high efficiency in elution and regeneration. The gel type iodine ion adsorbent can be used for removing iodine ions in radioactive wastes, acetic acid and sodium chloride through an adsorption method and is free from secondary pollution. The gel type iodine ion adsorbent can also be used for extracting iodine ions in concentrated seawater, seaweed extract and brine through the adsorption method, and a system needs no oxidization and has no limit to the iodine content.

Description

【Technical field】 [0001] The invention relates to the technical field of separation of chemical and chemical substances, in particular to a gel-type iodide ion adsorbent, its preparation method and application. 【Background technique】 [0002] Radioactive iodine is contained in the radioactive waste produced by nuclear facilities, and the iodine nuclides and their half-lives of these radioactive iodines are respectively 123 I (13.2 hours), 125 I (60 days), 129 I(1.67×10 7 year), 131 I (8.3 days), 132 I (2.28 hours), 133 I (20.3 hours), 134 I (52.5 minutes), and 135 I (6.8 hours). After radioactive iodine enters the environment, it will eventually accumulate in the human body through various circulatory systems and enter the thyroid gland to cause cancer. Therefore, the removal of radioactive iodine contamination has become a research hotspot. [0003] CN200710306055.5 provides a process for extracting radioactive iodine from a nuclear reactor, using aluminum oxide o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30B01J20/34C02F1/28C02F1/58
Inventor 李权张慧芳郭敏叶秀深刘海宁吴志坚
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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