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A composite fiber membrane for purifying CS in water and preparation method thereof

A composite fiber membrane and water purification technology, applied in chemical instruments and methods, silicon compounds, radioactive purification, etc., can solve problems such as difficult separation, secondary pollution, easy aggregation of Prussian blue powder, etc., achieve large specific surface area, occupy an area The effect of small area and strong flexibility

Active Publication Date: 2022-07-19
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical application, it is found that Prussian blue powder is easy to aggregate, and it is difficult to separate from the reaction system after adsorption, which is prone to secondary pollution and seriously limits its application. Therefore, it is imminent to develop an adsorbent with high efficiency, flexible operation and easy separation.

Method used

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  • A composite fiber membrane for purifying CS in water and preparation method thereof
  • A composite fiber membrane for purifying CS in water and preparation method thereof
  • A composite fiber membrane for purifying CS in water and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Prepare a mixture of ethyl orthosilicate, ethanol, hydrochloric acid and water in a mass ratio of 1:1.65:2:0.01. The reaction temperature is 80 °C, the stirring speed is 200 r / min, and the reaction time is 120 min. Prepared SiO 2 The solution is milky white. the SiO 2 The solution was placed in a spinning device, the electrospinning voltage was 18 kV, the spinning distance was 20 cm, and the spinning time was 180 min, that is, until the aluminum foil was covered with white fibers, SiO was obtained. 2 nanofiber membrane;

[0034] (2) Prepare (30:1:1, v / v / v) mixed solution of ethanol (90% wt), HCl (37% wt) and 3-aminopropyltriethoxysilane (APTES) according to the volume ratio, It was hydrolyzed for 60 min. the SiO 2 The nanofiber membrane was placed in the silane sol and taken out after 30 min. The aminopropylsilane sol can be inhaled into the pores of the nanofiber membrane through capillary action, and the sol is condensed to form a Si-O-Si network, which is r...

Embodiment 2

[0038] (1) Prepare a mixture of ethyl orthosilicate, ethanol, hydrochloric acid, and water in a mass ratio of 1:2:2:0.01, the reaction temperature is 80 °C, the stirring speed is 200 r / min, and the reaction time is 120 min. Prepared SiO 2 The solution is milky white. the SiO 2 The solution was placed in a spinning device, the electrospinning voltage was 18 kV, the spinning distance was 20 cm, and the spinning time was 180 min, that is, until the aluminum foil was covered with white fibers, SiO was obtained. 2 nanofiber membrane;

[0039] (2) Prepare (30:1:1, v / v / v) mixed solution of ethanol (90% wt), HCl (37% wt) and 3-aminopropyltriethoxysilane (APTES) according to the volume ratio, It was hydrolyzed for 60 min. the SiO 2 The nanofiber membrane was placed in the silane sol and taken out after 30 min. The aminopropylsilane sol can be inhaled into the pores of the nanofiber membrane through capillary action, and the sol is condensed to form a Si-O-Si network, which is rep...

Embodiment 3

[0043] (1) Prepare a mixture of ethyl orthosilicate, ethanol, hydrochloric acid, and water in a mass ratio of 1:3.5:2:0.01. The reaction temperature is 80 °C, the stirring speed is 200 r / min, and the reaction time is 120 min. Prepared SiO 2 The solution is milky white. the SiO 2 The solution was placed in a spinning device, the electrospinning voltage was 18 kV, the spinning distance was 20 cm, and the spinning time was 180 min, that is, until the aluminum foil was covered with white fibers, SiO was obtained. 2 nanofiber membrane;

[0044] (2) Prepare (30:1:1, v / v / v) mixed solution of ethanol (90% wt), HCl (37% wt) and 3-aminopropyltriethoxysilane (APTES) according to the volume ratio, It was hydrolyzed for 60 min. the SiO 2 The nanofiber membrane was placed in the silane sol and taken out after 30 min. The aminopropylsilane sol can be inhaled into the pores of the nanofiber membrane through capillary action, and the sol is condensed to form a Si-O-Si network, which is r...

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Abstract

The invention provides a composite fiber membrane for purifying Cs in water and a preparation method thereof. The composite fiber membrane can effectively purify radioactive Cs in water, and is widely used in the research of radioactive isotopes and in the treatment process of wastewater discharged from hospitals and factories. The specific method is: firstly, SiO is prepared by electrospinning technology 2 Nanofibrous membranes, modified with 3-aminopropyltriethoxysilane, with K 4 Fe(CN) 6 and FeCl 3 The nano-Prussian blue was grown on the surface of the nanofiber membrane by reacting under hydrothermal conditions, namely, a nano-Prussian blue composite fiber membrane was constructed. The composite fiber membrane uses silica as a carrier, which can selectively adsorb Cs elements and realize efficient purification of radioactive Cs elements. Compared with traditional industrial Cs separation methods, the composite fiber membrane has the advantages of low energy consumption, high separation efficiency, and one-step curing. Separation, no secondary pollution, effectively avoid the shortcomings of redundant separation operations and large amount of radioactive waste in traditional methods.

Description

technical field [0001] The invention relates to a composite fiber membrane for purifying Cs in water and a preparation method thereof, belonging to the fields of new materials and energy saving and environmental protection. Background technique [0002] In 2011, a serious nuclear leakage accident at the Fukushima nuclear power plant caused a large amount of radioactive waste to enter the water body, which caused widespread concern. nuclear wastewater contains 137 Cs, 90 Sr and 131 I and other radioactive elements, of which 137 Cs has a long half-life of up to 30.17 years and a specific activity of 3.17×10 11 Bq / g, 137 The radiation of Cs to the human body is mainly beta radiation and gamma radiation, which can enter the human body through food or air and cause damage to human health. Therefore, it is very important to treat radioactive wastewater containing cesium. [0003] The treatment method of radioactive wastewater is different from that of traditional industrial...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D69/12B01D69/02B01D67/00B01J20/10B01J20/28B01J20/30G21F9/12
CPCB01D71/027B01D71/02B01D69/125B01D69/02B01D67/0044B01D67/0039B01J20/103B01J20/0259B01J20/28023B01J20/28054B01J20/28057G21F9/12B01D2325/12
Inventor 冯珊珊陈风郑玮胡雪琦韦锦琦
Owner CHANGZHOU UNIV
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