Adsorption liquid for removing uranium-polluted wastewater and preparation method thereof

Abstract

The invention relates to the technical field of wastewater treatment, in particular to adsorption liquid for removing uranium-polluted wastewater and a preparation method of the adsorption liquid. Conventional amidoxime adsorption materials are poor in hydrophilicity and complex in preparation process. Aiming at the technical problem, the invention provides the adsorption liquid for removing uranium-polluted wastewater, the main effective adsorption component of the adsorption liquid is beta-lactoglobulin aggregate, uranyl ions in uranium-containing polluted wastewater can be adsorbed, and thus the effect of purifying the uranium-containing polluted wastewater is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, and in particular to an adsorption liquid for removing uranium-contaminated wastewater and a preparation method thereof. Background Art

[0002] Uranium is an important component of nuclear fuel and the material basis for the development of the nuclear industry. It is crucial to ensure the construction and sustainable development of the nuclear industry. However, due to natural and human factors, uranium will cause certain harm to the ecological environment and human health when it is released into the water.

[0003] The common methods for removing uranium pollutants currently available include: adsorption, extraction, ion exchange, membrane separation, chemical precipitation, electrochemical method, etc. In contrast, adsorption has become the most promising method for removing uranium pollutants due to its advantages of low cost, simple operation, no or little secondary pollution, easy multifunctionalization and regeneration. Among them, adsorption materials containing oxime functional groups are the main research objects. Amidoxime is one of the most common adsorption materials with specific binding ability to uranium. However, existing amidoxime adsorption materials generally have problems such as poor hydrophilicity, complex preparation process, and difficult material recovery.

[0004] There are still many technical problems in the removal of uranium pollutants. In the design and development of adsorption materials, it is necessary not only to increase the uranium adsorption efficiency of the material, but also to consider the large-scale preparation process and cost of the material to provide a material basis for large-scale uranium extraction. Summary of the invention

[0005] The problems existing in the prior art are: conventional amidoxime adsorption materials have poor hydrophilicity and complicated preparation process. In view of the above technical problems, the present invention provides an adsorption liquid for removing uranium contaminated wastewater, and the preparation method thereof is as follows:

[0006] (1) adding whey protein powder into deionized water, stirring and dissolving uniformly to obtain a whey protein solution with a mass concentration of 0.02 g / mL;

[0007] (2) A pH adjuster is added to the whey protein solution to adjust the solution to be alkaline or acidic, and then the solution is heated to 90° C. and stirred at a constant temperature for at least 8 hours to obtain an adsorption solution containing β-lactoglobulin aggregates.

[0008] Preferably, after the pH adjuster is added in step (2), the pH of the solution is 2-12. More preferably, after the pH adjuster is added in step (2), the pH of the solution is 10. More preferably, after the pH adjuster is added in step (2), the pH of the solution is 4.

[0009] Preferably, the pH adjuster is hydrochloric acid or sodium hydroxide aqueous solution.

[0010] Preferably, the concentration of hydrochloric acid is 0.5-1 mol / L.

[0011] Preferably, the concentration of the sodium hydroxide aqueous solution is 0.5-1 mol / L.

[0012] The present invention has the following beneficial effects:

[0013] (1) The adsorption liquid for removing uranium-contaminated wastewater obtained by the present invention has a good adsorption and removal effect on uranyl ions in the wastewater. In particular, when the pH of the adsorption liquid is 4 or 10, the removal effect of uranyl ions in the wastewater is more significant;

[0014] (2) The method for obtaining the adsorption liquid for removing uranium-contaminated wastewater of the present invention is simple. The adsorption material in the adsorption liquid has good hydrophilicity and can be recovered by simple solid-liquid separation, which has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 : Comparison diagram of the effects of the adsorption liquid for removing uranium-contaminated wastewater obtained in Examples 1-6 of the present invention on treating simulated uranium-containing wastewater.

[0016] Figure 2 : Graph showing the effect of removing uranyl ions by mixing the adsorption solution for removing uranium-contaminated wastewater obtained in Example 1 of the present invention with simulated uranium-containing wastewater in different volume ratios.

[0017] Figure 3 : Comparison diagram of the effects of the adsorption liquid obtained in Example 2 of the present invention and Comparative Example 1 on treating simulated uranium-containing wastewater for removing uranium-contaminated wastewater.

[0018] Figure 4 : Comparison diagram of the treatment effects of the adsorption liquid for removing uranium-contaminated wastewater obtained in Example 1 of the present invention on radioactive elements in uranium-containing wastewater and strontium-containing wastewater respectively. DETAILED DESCRIPTION

[0019] The present invention is described in detail below with reference to the examples. However, it should be understood that the following examples are only illustrative of the embodiments of the present invention, and are not intended to limit the scope of the present invention.

[0020] The whey protein powder used in the following examples of the present invention is chemically pure and was purchased from the Food Process Engineering and Dairy Technology Department in Munich, Germany.

[0021] Example 1

[0022] An adsorption liquid for removing uranium-contaminated wastewater, the preparation method is as follows:

[0023] (1) adding 2 g of whey protein powder into deionized water, stirring and dissolving uniformly to obtain a whey protein solution with a mass concentration of 0.02 g / mL;

[0024] (2) A pH adjuster (1 M hydrochloric acid) was added to the whey protein solution to adjust the pH of the solution to 2. The solution was then heated to 90° C. and stirred at a constant temperature of 200 rpm for 8 h to obtain an adsorption solution containing β-lactoglobulin aggregates.

[0025] Example 2

[0026] An adsorption liquid for removing uranium-contaminated wastewater, the preparation method is as follows:

[0027] (1) adding 2 g of whey protein powder into deionized water, stirring and dissolving uniformly to obtain a whey protein solution with a mass concentration of 0.02 g / mL;

[0028] (2) A pH adjuster (1 M hydrochloric acid) was added to the whey protein solution to adjust the solution pH to 4. The solution was then heated to 90° C. and stirred at a constant temperature of 200 rpm for 8 h to obtain an adsorption solution containing β-lactoglobulin aggregates.

[0029] Example 3

[0030] An adsorption liquid for removing uranium-contaminated wastewater, the preparation method is as follows:

[0031] (1) adding 2 g of whey protein powder into deionized water, stirring and dissolving uniformly to obtain a whey protein solution with a mass concentration of 0.02 g / mL;

[0032] (2) A pH adjuster (1 M hydrochloric acid) was added to the whey protein solution to adjust the solution pH to 6. Then, the solution was heated to 90° C. and stirred at a constant temperature of 200 rpm for 8 h to obtain an adsorption solution containing β-lactoglobulin aggregates.

[0033] Example 4

[0034] An adsorption liquid for removing uranium-contaminated wastewater, the preparation method is as follows:

[0035] (1) adding 2 g of whey protein powder into deionized water, stirring and dissolving uniformly to obtain a whey protein solution with a mass concentration of 0.02 g / mL;

[0036] (2) A pH adjuster (a 1 M sodium hydroxide aqueous solution) was added to the whey protein solution to adjust the solution pH to 8. Then, the solution was heated to 90° C. and stirred at a constant temperature of 200 rpm for 8 h to obtain an adsorption solution containing β-lactoglobulin aggregates.

[0037] Example 5

[0038] An adsorption liquid for removing uranium-contaminated wastewater, the preparation method is as follows:

[0039] (1) adding 2 g of whey protein powder into deionized water, stirring and dissolving uniformly to obtain a whey protein solution with a mass concentration of 0.02 g / mL;

[0040] (2) A pH adjuster (a 1 M sodium hydroxide aqueous solution) was added to the whey protein solution to adjust the solution pH to 10. Then, the solution was heated to 90° C. and stirred at a constant temperature of 200 rpm for 8 h to obtain an adsorption solution containing β-lactoglobulin aggregates.

[0041] Example 6

[0042] An adsorption liquid for removing uranium-contaminated wastewater, the preparation method is as follows:

[0043] (1) adding 2 g of whey protein powder into deionized water, stirring and dissolving uniformly to obtain a whey protein solution with a mass concentration of 0.02 g / mL;

[0044] (2) A pH adjuster (a 1 M sodium hydroxide aqueous solution) was added to the whey protein solution to adjust the solution pH to 12. Then, the solution was heated to 90° C. and stirred at a constant temperature of 200 rpm for 8 h.

[0045] Comparative Example 1 is the same as Example 2, except that the whey protein powder in Example 2 is replaced by lactoferrin powder in the same amount as in Example 2.

[0046] Performance Testing

[0047] A uranyl aqueous solution (the solute is uranyl nitrate hexahydrate) with a concentration of 32ppm was prepared as a simulated uranium-containing wastewater. Under light-proof conditions, the adsorption liquids for removing uranium-contaminated wastewater obtained in Examples 1-6 of the present invention were mixed with the simulated uranium-containing wastewater in a volume ratio of 3:7, and adsorbed for 8 hours under magnetic stirring at 200rpm. After the adsorption, the mixed solution was filtered with suction, the pore size of the filter paper was 0.22μm, and arsenazo III was added to the filtrate. After stirring evenly, the absorbance of uranyl ions in the filtrate was detected by spectrophotometry, thereby calculating the adsorption amount of uranyl ions in the simulated uranium-containing wastewater by the adsorption liquid. The specific test results are shown in the attached manual. Figure 1 shown.

[0048] The adsorption liquid for removing uranium-contaminated wastewater obtained in Example 1 was mixed with simulated uranium-containing wastewater in a volume ratio of 3:7, 4:6, 5:5, 2:8, and 1:9, respectively, and adsorbed for 8 hours under magnetic stirring at 200 rpm. After the adsorption, the mixed solution was filtered with suction, the pore size of the filter paper was 0.22 μm, and arsenazo III was added to the filtrate. After stirring evenly, the absorbance of uranyl ions in the filtrate was detected by spectrophotometry, so as to calculate the adsorption amount of uranyl ions in the simulated uranium-containing wastewater by the adsorption liquid. The specific test results are shown in the attached manual. Figure 2 shown.

[0049] The adsorption liquids for removing uranium-contaminated wastewater obtained in Example 2 and Comparative Example 1 were mixed with simulated uranium-containing wastewater in a volume ratio of 3:7, and adsorbed for 8 hours under magnetic stirring at 200 rpm. After the adsorption, the mixed solution was filtered with suction, the pore size of the filter paper was 0.22 μm, and arsenazo III was added to the filtrate. After stirring evenly, the absorbance of uranyl ions in the filtrate was detected by spectrophotometry, so as to calculate the adsorption amount of uranyl ions in the simulated uranium-containing wastewater by the adsorption liquid. The specific test results are shown in the attached manual. Figure 3 shown.

[0050] A strontium pollutant aqueous solution (the solute is strontium nitrate) with a concentration of 32ppm was prepared as a simulated strontium-containing wastewater. The adsorption liquid for removing uranium-contaminated wastewater obtained in Example 1 of the present invention was mixed with simulated uranium-containing wastewater and simulated strontium-containing wastewater in a volume ratio of 3:7, and adsorbed for 8 hours under magnetic stirring at 200rpm. After the adsorption, the mixed solutions were filtered, the pore size of the filter paper was 0.22μm, and arsenazo III was added to the filtrate. After stirring evenly, the absorbance of uranyl ions in the filtrate was detected by spectrophotometry, so as to calculate the adsorption amount of uranyl ions in the simulated uranium-containing wastewater by the adsorption liquid. The specific test results are shown in the attached manual. Figure 4 shown.

[0051] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An adsorption liquid for removing uranium-contaminated wastewater, characterized in that: The preparation method is as follows: (1) adding whey protein powder into deionized water, stirring and dissolving uniformly to obtain a whey protein solution with a mass concentration of 0.02 g / mL; (2) A pH adjuster is added to the whey protein solution to adjust the solution to be alkaline or acidic, and then the solution is heated to 90° C. and stirred at a constant temperature for at least 8 hours to obtain an adsorption solution containing β-lactoglobulin aggregates.

2. The adsorption liquid for removing uranium-contaminated wastewater according to claim 1, characterized in that: After adding the pH adjuster in step (2), the solution pH = 2-12.

3. The adsorption liquid for removing uranium-contaminated wastewater according to claim 2, characterized in that: After the pH adjuster is added in step (2), the solution pH=10.

4. The adsorption liquid for removing uranium-contaminated wastewater according to claim 2, characterized in that: After adding the pH adjuster in step (2), the solution pH=4.

5. The adsorption liquid for removing uranium-contaminated wastewater according to claim 1, characterized in that: The pH adjuster is hydrochloric acid or sodium hydroxide aqueous solution.

6. The adsorption liquid for removing uranium-contaminated wastewater according to claim 5, characterized in that: The concentration of hydrochloric acid is 0.5-1 mol / L.

7. The adsorption liquid for removing uranium-contaminated wastewater according to claim 5, characterized in that: The concentration of the sodium hydroxide aqueous solution is 0.5-1 mol / L.

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