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Preparation method of hybrid membrane adsorbent for removing strontium ions in radioactive wastewater

A technology of radioactive wastewater and strontium ions, applied in radioactive purification, chemical instruments and methods, membrane technology, etc., can solve the problems of multiple treatment steps, serious membrane pollution, complicated operation process, etc. Simple, easy-to-operate effect

Inactive Publication Date: 2014-09-17
HEFEI UNIV
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Problems solved by technology

[0003] Chinese Patent Application No. 201410009260.5 proposes a treatment method and device for radioactive strontium-containing wastewater, using strontium ions in radioactive wastewater to chemically react with calcium carbonate and sodium carbonate, so that strontium carbonate is deposited on the surface of calcium carbonate seed crystals to form a large The dense crystal particles quickly settle to the bottom of the hydrocyclone to remove some radioactive strontium ions; the small particles of strontium carbonate and crystal seeds enter the membrane separator with the supernatant and react with ferric chloride, and the particles pass through the hollow fiber membrane After separation, the radioactive strontium ions are further removed, so that the radioactivity of the effluent is greatly reduced; this method mainly uses chemical substances to precipitate strontium ions, and there are many processing steps, the operation process is complicated, more chemical deposition reagents are used, and the treatment of strontium ions is not thorough , serious membrane fouling and other shortcomings, its application value is limited, and it is difficult to meet the actual needs of large-scale industrial radioactive wastewater treatment
Fe 3 o 4 PEI-SBA-15MPS is used as the substrate, and Sr(II) is used as the template to prepare a magnetic temperature-sensitive surface strontium ion imprinted adsorbent; the strontium ion imprinted adsorbent prepared by this method has a magnetic Fe 3 o 4 Due to the disadvantages of poor compatibility with polymers, microphase separation and poor stability, its application value is limited, and it is difficult to meet the actual needs of large-scale industrial radioactive wastewater treatment.
[0005] Chinese patent application number 201210539412.3 proposes the preparation method and application of the surface imprinted adsorbent of yeast template hollow silicon-based material for adsorption and separation of strontium ions. The hollow silicon-based material of yeast template is used as the matrix material, divalent strontium ions are used as template ions, and chitosan Sugar is a functional monomer, γ-(2,3 glycidoxy) propyltrimethoxysilane is used as a crosslinking agent, and the imprinted adsorbent is prepared by performing ion imprinting polymerization modification by suspension polymerization method; this method exists yeast / Silicon complex coating is incomplete, template molecules are easy to fall off and poor thermal stability, etc., its application value is limited, and it is difficult to meet the actual needs of large-scale industrial radioactive wastewater treatment
[0006] So far, there has been no report on the use of hybrid membrane adsorbents for the removal of strontium ions in radioactive wastewater

Method used

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  • Preparation method of hybrid membrane adsorbent for removing strontium ions in radioactive wastewater
  • Preparation method of hybrid membrane adsorbent for removing strontium ions in radioactive wastewater
  • Preparation method of hybrid membrane adsorbent for removing strontium ions in radioactive wastewater

Examples

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Effect test

Embodiment 1

[0024] First, add 25g of polyvinyl alcohol (PVA) with an average degree of polymerization of 1750 ± 50 in a 250mL container equipped with a stirrer, under the temperature condition of 90°C (usually the reaction temperature can be at 0-150°C, it can be selected in this embodiment) Under the temperature condition of 90°C), in an inert atmosphere or air, add deionized water to the container while stirring continuously until the PVA is completely dissolved, and continue stirring for 2h to obtain a solution; then transfer the solution to a 500mL volumetric flask Add deionized water while vibrating to make it uniform, add deionized water until the solution reaches the full 500mL scale of the volumetric flask, continue to vibrate to make it uniform, and thus prepare polyvinyl alcohol with a mass percentage concentration of 5%. (PVA) aqueous solution.

[0025]Extract above-mentioned prepared 5% PVA solution; (calculate the quality of the silane coupling agent that needs to be added by...

Embodiment 2

[0032] Using the same experimental device and operating steps as in Example 1, in an inert atmosphere or air (taken in a nitrogen atmosphere in this embodiment), take 50g of polyvinyl alcohol (PVA) and deionized polyvinyl alcohol (PVA) with an average polymerization degree of 1750 ± 50 Water, the preparation mass percentage concentration is the polyvinyl alcohol (PVA) aqueous solution of 10%. Extract the prepared 10% PVA solution, (according to 0.2 times of the reactant polyvinyl alcohol (PVA) quality, calculate the quality of the silane coupling agent that needs to be added is 10g), add 10g of silane coupling agent γ-ammonia in this solution Propyltriethoxysilane (abbreviated as A-1100), conduct sol-gel reaction at 0°C for 12 hours, and then continue to stir for 24 hours (usually 1-48 hours for sol-gel reaction, in order to make the reaction more complete, this In the embodiment, the sol-gel reaction has been carried out for a total of 36h); the obtained sol-gel reaction prod...

Embodiment 3

[0036] In an argon atmosphere, under the temperature condition of 0°C (usually, the reaction temperature is 0-150°C, and the lower limit of the temperature is 0°C), add 1g to a 250mL container equipped with a stirrer. 50% polyvinyl alcohol (PVA), add deionized water to the container while stirring continuously until the PVA is completely dissolved, continue stirring for 5h to obtain a solution, then transfer the solution to a 1000mL volumetric flask, and shake while adding deionized water Make it uniform until deionized water is added until the solution reaches the full 1000mL scale of the volumetric flask, and continue to shake to make it uniform, thereby preparing a 0.1% mass percent concentration of polyvinyl alcohol (PVA) aqueous solution.

[0037] Extract above-mentioned prepared 0.1% PVA solution, (according to 0.01 times of reactant polyvinyl alcohol (PVA) quality, calculate the quality of the silane coupling agent that needs to add is 0.01g), add 0.01g silane coupling a...

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Abstract

The invention discloses a preparation method of a hybrid membrane adsorbent for removing strontium ions in radioactive wastewater. The preparation method is characterized by comprising the following steps of adding a silane coupling agent with the mass being 0.01-0.3 time of the mass of PVA (Polyvinyl Alcohol) into a polyvinyl alcohol aqueous solution with the mass percentage concentration being 0.1-10% at the temperature of 0-150 DEG C in inert atmosphere or air, carrying out sol-gel reaction for 1-48h, standing and defoaming a sol-gel product, coating the product to obtain a membrane, and drying for 2-72h under the conditions that the temperature is 0-200 DEG C and the relative humidity is 50-90% so as to obtain the hybrid membrane adsorbent for removing strontium ions in radioactive wastewater. According to the method, adsorption of metal ions and membrane separation of residual liquid left after adsorption can be implemented synchronously, and the operation process is simple and convenient; the prepared hybrid membrane adsorbent is good in membrane forming property, and has good adsorbing effect on low-concentration strontium ions, and can be used for adsorbing and removing low-concentration strontium ions in radioactive wastewater.

Description

technical field [0001] The invention belongs to the technical field of radioactive wastewater treatment, in particular to a method for preparing a hybrid membrane adsorbent for removing strontium ions in radioactive wastewater by using a sol-gel method. Background technique [0002] With the depletion of non-renewable energy sources such as petroleum and coal, as a new energy technology, nuclear power generation has developed rapidly in many countries in the world in recent years. my country's "Nuclear Power Plant Medium and Long-term Development Plan" proposes that by 2020, the installed capacity of nuclear power plants will reach 40 million kilowatts, the proportion of nuclear power in the total installed capacity of electricity will increase from less than 2% at present to 4%, and the annual nuclear power generation will reach 2600-2800 100 million kWh; a number of nuclear power plants are currently under construction or demonstration. However, with the rapid development ...

Claims

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Application Information

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IPC IPC(8): B01D71/38B01D69/10B01D67/00B01J20/26B01J20/28G21F9/12
Inventor 刘俊生褚志成韩成良
Owner HEFEI UNIV
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