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

Abstract

The invention discloses a preparation method of a hybrid membrane for removing strontium ions in radioactive wastewater. The preparation method comprises the following steps that a chitosan-epoxy chloropropane cross-linking product and a metal titanium precursor are prepared and then added into a polyvinyl alcohol aqueous solution to obtain a membrane coating solution; a support body is coated with the membrane coating solution until a membrane is obtained, and the membrane is separated from the support body and dried to obtain the hybrid membrane without the support body, or the membrane and the support body are not separated and dried to obtain the hybrid membrane with the support body; or the membrane coating solution is dissolved with solvent firstly, then the support body is coated with the membrane coating solution until the membrane is obtained, and the membrane is separated from the support body to obtain the hybrid membrane without the support body, or the membrane and the support body are not separated to obtain the hybrid membrane with the support body. The hybrid membrane prepared through the method is good in temperature resistance and high in adsorption efficiency, has the high adsorption capacity on strontium ions in water and not only can be used for adsorption removal of the strontium ions in the radioactive wastewater but also can be used for adsorption separation of strontium ions in nonradioactive wastewater.

Description

technical field [0001] The invention belongs to the technical field of radioactive wastewater treatment in the nuclear industry, and in particular relates to a method for preparing a hybrid membrane for removing strontium ions in radioactive wastewater by using a sol-gel method. Background technique [0002] 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 of nuclear power technology, nuclear power safety has attracted more attention. In particular, the Fukushima nuclear accident in Japan has sounded the alarm for us. How to safe...

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Problems solved by technology

[0004] Chinese patent application 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 large particles The dense crystal particles quickly settle to the bottom of the hydrocyclone to remove part of the 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 are separated by the hollow fiber membrane After further removing radioactive strontium ions, the radioactivity of the effluent is greatly reduced; this method mainly uses chemical substances to precipitate strontium ions, which has many processing steps, complicated operation process, more chemical deposition reagents, and incomplete treatment of strontium ions. Membrane fouling and other shortcomings, its application value is limited, it is difficult to meet the actual needs of large-scale industrial radioactive wastewater treatment

[0005] Chinese patent application 201210539412.3 proposes a preparation method and application of an imprinted adsorbent on the surface of a yeast template hollow silicon-based material for adsorption and separation of strontium ions. The yeast template hollow silicon-based material is used as the matrix material, divalent strontium ions are used as template ions, and chitosan It is a functional monomer, and γ-(2,3 glycidoxy) propyltrimethoxysilane is used as a crosslinking agent. It is prepared by performing ion imprinting polymerization modification by suspension polymerization to obtain an imprinted adsorbent; this method exists yeast / silicon The complex coating is incomplete, the template molecules are easy to fall off, and the thermal stability is poor. Its application value is limited, and it is difficult to meet the actual needs of large-scale industrial radioactive wastewater treatment.

[0006] Chinese patent application 201610141746.3 proposes a method of using montmorillonite-ureolytic bacteria to jointly control strontium ion pollution. A ureolytic bacterium isolated from the natural environment is used to insert the bacterium into a liquid medium, and then montmorillonite Add stone to the soil or water containing strontium ions; then add urea, peptone and the obtained urea bacteria solution to the polluted water to remove strontium ions in the polluted water; this method is mainly based on urea decomposing bacteria To adsorb strontium ions, there are many processing steps, serious secondary pollution, urea-decomposing bacteria are greatly affected by the ambient temperature, and the use is limited by the large temperature difference between the north and the south, and the application value is limited.

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