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Sulfydryl-modified SBA-15 and preparation method thereof, bismuth-based adsorbent and preparation method and application thereof

An adsorbent, the technology of mercaptopropyltrimethoxysilane, is applied in the field of mercapto-modified SBA-15 and its preparation, bismuth-based adsorbent and its preparation, which can solve the problem of poor stability of iodine, damage to human health, and simple decomposition of iodine. to improve the adsorption capacity and stability

Pending Publication Date: 2022-05-17
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the stability of iodine adsorption by traditional solid adsorbents is poor, and simple iodine is easily dissociated from the adsorbent, resulting in secondary environmental pollution and damage to human health.

Method used

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  • Sulfydryl-modified SBA-15 and preparation method thereof, bismuth-based adsorbent and preparation method and application thereof
  • Sulfydryl-modified SBA-15 and preparation method thereof, bismuth-based adsorbent and preparation method and application thereof
  • Sulfydryl-modified SBA-15 and preparation method thereof, bismuth-based adsorbent and preparation method and application thereof

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preparation example Construction

[0039] The invention provides a preparation method of SBA-15 modified by mercapto groups, comprising the following steps:

[0040] 1) Mix P123, silicon source and 3-mercaptopropyltrimethoxysilane with hydrochloric acid solution, and perform a hydrothermal reaction to obtain a mercapto-modified SBA-15 precursor;

[0041] The temperature of the hydrothermal reaction is 120°C, and the time is 48h;

[0042] 2) removing P123 in the mercapto-modified SBA-15 precursor to obtain mercapto-modified SBA-15.

[0043] The invention mixes P123, silicon source and 3-mercaptopropyltrimethoxysilane with hydrochloric acid solution to carry out hydrothermal reaction to obtain the SBA-15 precursor. In the present invention, the silicon source is preferably tetraethyl silicate or sodium orthosilicate; in the present invention, the concentration of the hydrochloric acid solution is preferably 2mol / L; in the present invention, the P123 as SBA- The template of 15 molecular sieves plays a structural...

Embodiment 1

[0071] Dissolve 4g of domestic P123 in 2M hydrochloric acid solution and fully stir to dissolve for 2.5h, add dropwise 32mmoL of TEOS to the solution, stir at 40°C for 3h to completely dissolve; then add 9mmol (ie x=9) The 3-mercaptopropyltrimethoxysilane solution was added dropwise to the above solution, fully stirred at 40°C for 20h to dissolve it completely; then the mixed solution was moved into a reaction kettle, and the hydrothermal reaction was carried out at 120°C for 48h, and the reaction After the completion, filter, wash repeatedly and dry at 60°C for 24 hours to obtain a white solid powder; add the obtained white solid to anhydrous ethanol solution at a ratio of 1g: 200mL, reflux extraction at 78°C for 24h, then filter, and Dry at 60°C for 24 hours to obtain white solid powdery mercapto-modified SBA-15, which is designated as SBA-15-1; impregnate the dried SBA-15-1 in 1g: 100mL of bismuth chloride After fully stirring in methanol solution for 12 hours, filter with ...

Embodiment 2

[0073] The only difference from Example 1 is that x=11.5, that is, 29.5 mmol TEOS and 11.5 mmol 3-mercaptopropyltrimethoxysilane are added dropwise, and the rest are the same as Example 2. The obtained white solid powdery mercapto-modified SBA-15 is designated as SBA-15-2, and the obtained black solid powdery bismuth-based adsorbent is designated as Bir-SBA-15-2.

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Abstract

The invention provides sulfydryl modified SBA-15 and a preparation method thereof, a bismuth-based adsorbent and a preparation method and application thereof, and belongs to the technical field of iodine adsorbents. The preparation method comprises the following steps: by taking P123 as a structure-directing agent, introducing a sulfydryl group by utilizing 3-mercaptopropyltrimethoxysilane by adopting a post-grafting method, and performing hydrothermal reaction with a silicon source under an acidic condition to synthesize sulfydryl modified SBA-15. The surface of the sulfydryl-modified SBA-15 contains a large amount of sulfydryl, so that the sulfydryl-modified SBA-15 has relatively large intermolecular force with iodine, and the adsorption quantity and stability of adsorbing iodine are improved. After sulfydryl modified SBA-15 is impregnated in a bismuth source, the bismuth-based adsorbent prepared through an argon and hydrogen in-situ reduction method reacts with the iodine elementary substance to generate stable BiI3 when adsorbing the iodine elementary substance, and the stability of the adsorbent is further improved.

Description

technical field [0001] The invention belongs to the technical field of iodine adsorbents, and in particular relates to a mercapto-modified SBA-15 and a preparation method thereof, a bismuth-based adsorbent, a preparation method and an application thereof. Background technique [0002] With the continuous development of nuclear energy, the treatment of spent fuel reprocessing exhaust gas has also attracted much attention. Iodine is a radionuclide with a half-life of about 8 days ( 131 I) to 1.6×10 7 year( 129 I), 129 I poses the most serious environmental concerns due to its high toxicity, high mobility and long half-life. At the same time, iodine vapor is iodine after sublimation. Inhalation of iodine vapor will cause respiratory damage, bronchitis, pneumonia and even pulmonary edema. Increased risk of thyroid cancer. Therefore, it is necessary to remove iodine vapor in nuclear waste. [0003] Radioactive iodine exists widely in nuclear waste gas, mostly in the form of...

Claims

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Application Information

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IPC IPC(8): B01J20/10G21F9/02B01J20/30C01B39/00C01B37/00
CPCB01J20/103B01J20/02B01J20/0259B01J20/0266C01B39/00C01B37/00G21F9/02C01P2002/72Y02E30/30
Inventor 段涛刘建左雪丽牟志伟赵倩朱琳
Owner SOUTHWEAT UNIV OF SCI & TECH
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