Preparation method of amphoteric ion pair hybrid membrane for removing cobalt ions in radioactive wastewater

A radioactive wastewater, zwitterion technology, applied in radioactive purification, chemical instruments and methods, ion exchange water/sewage treatment, etc., can solve the problems of low cobalt ion adsorption, easy shedding of imprinted molecules, limited application value, etc. Adsorption and removal ability, the effect of eliminating environmental and human hazards, and simple operation

Active Publication Date: 2016-11-23
太湖县市场监督检验所(太湖县功能膜检测研究院)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent 201110268222.8 proposes a preparation method and application of a metal ion-imprinted chitosan cross-linked membrane adsorbent, which is to form a uniform complex film-making solution between a metal salt and a chitosan solution, and cast it into a film. The prepared imprinted membrane was subjected to pre-crosslinking reaction in aqueous solution, followed by chemical crosslinking modification reaction, and finally metal ions and pre-crosslinking agent were eluted by dilute acid solution to release amino groups to obtain metal ion imprinted chitosan crosslinking reaction. Membrane-linked adsorbent; the method mainly uses the imprinting method to adsorb metal ions (although it is stated in the claims that cobalt ions can be adsorbed, but there is no specific embodiment of cobalt ion adsorption and separation in the specification), there are imprinted molecules that are easy to fall off and Poor film stability and other shortcomings, its application value is limited
[0005] Chinese patent 201510633100.2 proposes a preparation method of a hybrid membrane adsorbent for removing cobalt ions in radioactive wastewater. The silane coupling agent and ammonium dihydrogen phosphate are subjected to sol-gel reaction to prepare a hybrid precursor, and then combined with poly Vinyl alcohol is mixed until the coating solution is obtained, and the coating film is obtained as a hybrid film adsorbent; this method is mainly to add inorganic substances to the polyvinyl alcohol solution, and there is a single functional group in the hybrid precursor, which can adsorb cobalt ions low volume and other shortcomings, its performance needs to be further improved
[0006] So far, there are no other reports on the use of zwitterion-pair hybrid membranes for the removal of cobalt ions in radioactive wastewater

Method used

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  • Preparation method of amphoteric ion pair hybrid membrane for removing cobalt ions in radioactive wastewater
  • Preparation method of amphoteric ion pair hybrid membrane for removing cobalt ions in radioactive wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Preparation of zwitterion-pair hybrid membrane for removal of cobalt ions from radioactive wastewater:

[0037] (1) Preparation of 5% PVA aqueous solution: add 50g of polyvinyl alcohol (PVA) with an average degree of polymerization of 1750±50 to a 250mL container equipped with a stirrer, then add an appropriate amount of deionized water, in the air, in Under the temperature condition of 90℃, keep stirring the mixture of PVA and water in the container until the PVA is completely dissolved, and continue stirring for 2 hours to obtain a solution. After cooling, transfer the solution to a 1000mL volumetric flask, add a certain amount of deionized water, and shake. Evenly, add an appropriate amount of deionized water until the solution reaches the full scale of the volumetric flask, and then shake evenly, thereby preparing 1000 g of a PVA aqueous solution with a concentration of 5% by mass.

[0038] (2) Preparation of coating liquid: put a clean beaker with a volume of 250 m...

Embodiment 2

[0046] Using the same experimental device, operation steps and the same ingredient ratio as in Example 1, the non-woven fabric was immersed in the above-mentioned coating solution after standing and defoaming, and the support non-woven fabric was dipped and coated to obtain a film sheet. , the membrane and the non-woven fabric are placed together at 70°C and the relative humidity is 90% (usually, the relative humidity of the membrane drying is 50% to 90%, and the upper limit value is 90%). After drying for 10 hours, a zwitterion-pair hybrid membrane with a support nonwoven fabric was obtained.

[0047] The zwitterion-pair hybrid membrane prepared in this example was subjected to adsorption of 100 mg / L CoCl 2 The experiment of cobalt ions in solution shows that: under the conditions of 25 ℃ and pH=3, the hybrid film has no effect on Co. 2+ The adsorption amount is 8.01 mg / g; it can be seen that the zwitterion-pair hybrid membrane can be used to adsorb and remove cobalt ions in...

Embodiment 3

[0050] Using the same experimental device, operation steps and the same proportion of ingredients as in Example 1, the coating liquid was first dissolved in 20 mL of N,N-dimethylformamide (DMF) solvent, and then the obtained material was dissolved in The support glass plate was sprayed and coated to obtain a film, then dried in nitrogen at 150°C and a relative humidity of 70% for 12 hours, cooled at room temperature and separated from the glass plate to obtain a film without a support. Zwitterion Pair Hybrid Membranes.

[0051] The zwitterion-pair hybrid membrane prepared in this example was subjected to adsorption of 100 mg / L CoCl 2 The experiment of cobalt ion in solution shows that: under the conditions of 25 ℃ and pH=2, the hybrid film has no effect on Co. 2+ The adsorption amount was 5.97 mg / g; it can be seen that the zwitterion-pair hybrid membrane can be used to adsorb and remove cobalt ions in aqueous solution.

[0052] To sum up, in this example, a zwitterion-pair h...

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Abstract

The invention discloses a preparation method of an amphoteric ion pair hybrid membrane for removing cobalt ions in radioactive wastewater. Silane coupling agents and cross-linking agents are added into polyvinyl alcohol water solution to perform cross-linking reaction, internal ester is added into a cross-linking product to perform epoxy opening ring reaction to obtain film coating solution. The film coating solution is used for coating a support with films to obtain a membrane, the membrane is separated from the support and dried to obtain a membrane without the support, or the membrane is not separated from the support and dried to obtain a membrane with the support. Alternatively, the film coating solution is firstly dissolved by solvents and then used for coating the support with films to obtain the membrane, or the cross-linking product is firstly coated with films to obtain the membrane, and then the membrane is soaked in the internal ester to perform epoxy opening ring reaction. The obtained amphoteric ion pair hybrid membrane can contain the support, can also contain no support, has high adsorption removal capacity for the cobalt ions in water, can be used for adsorbing and removing the cobalt ions in the radioactive wastewater and can also be used for adsorbing and separating the cobalt ions in nonradioactive wastewater.

Description

technical field [0001] The invention belongs to the technical field of radioactive waste water treatment, and in particular relates to a method for preparing a zwitterionic hybrid membrane (zwitterionic hybrid membrane) for removing cobalt ions in radioactive waste water by using a crosslinking reaction and an epoxy ring-opening reaction. Background technique [0002] With the rapid development of my country's nuclear power technology and the gradual increase in the number of nuclear power plants, the safety of nuclear power has aroused people's special attention. Japan's Fukushima nuclear power plant leakage accident has sounded the alarm for us. How to safely, economically and properly dispose of radioactive wastewater has become one of the key issues that must be resolved in the sustainable development of my country's nuclear power industry. Therefore, adopting new technologies and new methods to treat nuclear power wastewater has become a key scientific and technological...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/10B01D69/02G21F9/12C02F1/44C02F1/42
CPCB01D67/0006B01D69/02B01D69/10B01D2323/30B01D2325/42C02F1/42C02F1/44G21F9/12
Inventor 刘俊生王康胡科研李萌
Owner 太湖县市场监督检验所(太湖县功能膜检测研究院)
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