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Application of a functional composite material in the treatment of uranium-containing wastewater

A composite material and wastewater treatment technology, which is applied in water/sewage treatment, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of small adsorption capacity, achieve improved adsorption capacity, convenient operation, and particle size The effect of uniform diameter distribution

Active Publication Date: 2021-07-20
NANHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen from the experimental data that the hydrotalcite material also has the disadvantage of small adsorption capacity.

Method used

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  • Application of a functional composite material in the treatment of uranium-containing wastewater
  • Application of a functional composite material in the treatment of uranium-containing wastewater
  • Application of a functional composite material in the treatment of uranium-containing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Press n[CO(NH 2 ) 2 ]: n(Mg 2+ +Al 3+ )=10:1, n(Mg 2+ ): n(Al 3+ )=2.5:1, weigh 21g CO(NH 2 ) 2 , dissolved in 50ml deionized water; 6.4g Mg(NO 3 ) 2 ·6H 2 O and 3.75gAl(NO 3 ) 3 9H 2 O, dissolved in 100ml deionized water. Add the two solutions into a three-neck flask with a stirrer at the same time, and continue stirring at 60°C for 30 min after the addition. The prepared solution was transferred to a polytetrafluoroethylene autoclave, put into an oven, and crystallized at a constant temperature of 150° C. for 12 hours. After that, the reaction kettle was taken out and cooled to room temperature. The resulting precipitate was filtered, washed several times with deionized water, and then dried at 100°C for 6 h to obtain the product, which was designated as Mg-Al-LDHs.

[0042] Wash the above hydrotalcite Mg-Al-LDHs with pure water to neutrality, then put it in a muffle furnace, raise the temperature to 500°C in an air atmosphere, and keep it warm for 6h, t...

Embodiment 2

[0058] This example is to investigate the adsorption of composite materials to uranium-containing wastewater with different pH values. Figure 7 The initial concentration of uranium-containing wastewater in the test shown is 30mg.L -1 , the adsorption time is 2.5 hours, the wastewater temperature is 30°C, the volume of the uranium-containing wastewater used in the test is 520mL, the amount of adsorbent in the wastewater is 0.001g, and the pH value of the wastewater is 2-10.

[0059] Depend on Figure 7 It can be seen that the pH value of the wastewater is in the range of 3-8, and the adsorption amount of uranium in the uranium-containing wastewater by the composite material is maintained between 1350-1550 mg / g. It shows that the method of the present invention is suitable for a wide range of pH values ​​of uranium-containing wastewater.

[0060] Analyzing the reason, it may be that when the uranium-containing wastewater is in a weak acid or weak base environment, the calcine...

Embodiment 3

[0062] This example is to investigate the adsorption of uranium in uranium-containing wastewater by the composite material under the interference of different interfering ions. Figure 8 The initial concentration of uranium in the uranium-containing wastewater in the test shown is 60 mg.L -1 , the adsorption time is 2.5 hours, the wastewater temperature is 30°C, the volume of the uranium-containing wastewater used in the test is 520mL, the amount of adsorbent in the wastewater is 0.001g, and the pH value of the wastewater is 3.

[0063] In this example, a certain concentration of Na + , K + , Fe 3+ , Cu 2+ , Zn 2+ and Ni 2+ The adsorption of uranium in uranium-containing wastewater by the composite material. Depend on Figure 8 It can be seen that different interfering ions adsorb UO on the composite material 2 2+The impact is different. Among them, Na + and K + Adsorption of UO on composite materials 2 2+ Little effect, Ni 2+ Adsorption of UO on composite mater...

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Abstract

The invention provides an application of a functionalized composite material in the treatment of uranium-containing wastewater. The functionalized composite material comprises a calcined layered double metal hydroxide and grafted mercaptopropylalkoxysilane on it. The application includes making the functionalized composite material fully contact with uranium-containing wastewater to absorb uranium in the wastewater, and the functionalized composite material and the uranium-containing wastewater are ultrasonically mixed for more than 30 seconds. The composite material provided by the invention not only makes good use of the hydrotalcite-like space layer structure but also makes good use of the high-efficiency adsorption capacity of the mercapto group for heavy metal ions. Compared with common adsorbents, the adsorption capacity is significantly improved, and the maximum adsorption capacity of the composite material of the invention is 30 times that of unmodified hydrotalcite for uranium.

Description

technical field [0001] The invention belongs to the field of resource utilization and environmental protection, and particularly relates to the application of a functionalized hydrotalcite composite material in the treatment of uranium-containing wastewater. Background technique [0002] In recent years, with the continuous development of nuclear energy, radioactive nuclear waste has gradually increased, which has brought a heavy burden and serious crisis to the environment and ecology. Therefore, how to properly deal with radioactive nuclear pollution has become a worldwide environmental protection issue. At present, the methods for removing radioactive elements in the water environment include: chemical precipitation method, ion exchange method, solvent extraction method and adsorption method, etc. Among them, the adsorption method has high efficiency, low cost, simple treatment process and is not easy to cause secondary pollution, etc. Advantages, has been widely used in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F101/20
CPCC02F1/288C02F2101/006C02F2101/20
Inventor 阳鹏飞徐源合柯国军尹纳艾勇
Owner NANHUA UNIV
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