Adsorbing liquid for removing uranium contaminated wastewater and its preparation method

Abstract

The present application relates to wastewater treatment technical field, specifically to a kind of adsorption liquid for removing uranium contaminated wastewater and its preparation method.Conventional amine oxime adsorption material poor hydrophilicity, preparation process is complex.For the above technical problems, the present application provides a kind of adsorption liquid for removing uranium contaminated wastewater, and its main effective adsorption component is beta-lactoglobulin aggregate, can be adsorbed to uranium contaminated wastewater containing uranyl ion, so as to achieve the purification effect of uranium contaminated wastewater.

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 a key component of nuclear fuel and the material foundation for the development of the nuclear industry. It is crucial for ensuring the construction and sustainable development of the nuclear industry. However, due to both natural and human factors, the release of uranium into water bodies can pose certain risks to the ecological environment and human health.

[0003] Currently available methods for removing common uranium contaminants include adsorption, extraction, ion exchange, membrane separation, chemical precipitation, and electrochemical methods. Adsorption, by contrast, offers the most promising advantages due to its low cost, ease of operation, minimal or no secondary pollution, and ease of multifunctionalization and regeneration. Adsorbents containing oxime functional groups are a primary focus of research. Amidoximes are among the most common adsorbents, exhibiting specific binding capacity for uranium. However, existing amidoxime adsorbents generally suffer from poor hydrophilicity, complex preparation processes, and difficulty in recycling.

[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] Problems in the prior art are: conventional amidoxime adsorption materials have poor hydrophilicity and complex preparation processes. To address the above technical problems, the present invention provides an adsorption solution for removing uranium-contaminated wastewater, the preparation method of which is as follows:

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

[0007] (2) A pH regulator is added to the whey protein solution to adjust the solution to alkaline or acidic. 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 regulator is added in step (2), the pH of the solution is 2-12. More preferably, after the pH regulator is added in step (2), the pH of the solution is 10. More preferably, after the pH regulator 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 solution 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 solution is 4 or 10, the removal effect of uranyl ions in the wastewater is more significant;

[0014] (2) The method of the present invention for obtaining an adsorption liquid for removing uranium-contaminated wastewater 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 treating simulated uranium-containing wastewater with adsorption solutions for removing uranium-contaminated wastewater obtained in Examples 1-6 of the present invention.

[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 : Comparative 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 will be described in detail below with reference to the following examples. However, it should be understood that the following examples are merely 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 was chemically pure and purchased from the Department of Food Process Engineering and Dairy Technology in Munich, Germany.

[0021] Example 1

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

[0023] (1) Add 2 g of whey protein powder to deionized water and stir to dissolve evenly to obtain a whey protein solution with a mass concentration of 0.02 g / mL;

[0024] (2) A pH regulator (1 M hydrochloric acid) was added to the whey protein solution to adjust the solution pH 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) Add 2 g of whey protein powder to deionized water and stir to dissolve evenly to obtain a whey protein solution with a mass concentration of 0.02 g / mL;

[0028] (2) A pH regulator (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) Add 2 g of whey protein powder to deionized water and stir to dissolve evenly to obtain a whey protein solution with a mass concentration of 0.02 g / mL;

[0032] (2) A pH regulator (1 M hydrochloric acid) was added to the whey protein solution to adjust the solution pH to 6. 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.

[0033] Example 4

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

[0035] (1) Add 2 g of whey protein powder to deionized water and stir to dissolve evenly to obtain a whey protein solution with a mass concentration of 0.02 g / mL;

[0036] (2) A pH regulator (a 1 M sodium hydroxide aqueous solution) was added to the whey protein solution to adjust the solution pH to 8. 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.

[0037] Example 5

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

[0039] (1) Add 2 g of whey protein powder to deionized water and stir to dissolve evenly to obtain a whey protein solution with a mass concentration of 0.02 g / mL;

[0040] (2) A pH regulator (a 1 M sodium hydroxide aqueous solution) was added to the whey protein solution to adjust the solution pH to 10. 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.

[0041] Example 6

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

[0043] (1) Add 2 g of whey protein powder to deionized water and stir to dissolve evenly to obtain a whey protein solution with a mass concentration of 0.02 g / mL;

[0044] (2) A pH regulator (a 1 M sodium hydroxide aqueous solution) was added to the whey protein solution to adjust the solution pH to 12. The solution was then 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 the same amount of lactoferrin powder in Comparative Example 1.

[0046] Performance Testing

[0047] A uranyl aqueous solution (the solute is uranyl nitrate hexahydrate) with a concentration of 32ppm was prepared as a simulation of uranium-containing wastewater. Under light-proof conditions, the adsorption liquid for removing uranium-contaminated wastewater obtained in Examples 1-6 of the present invention was mixed with the simulated uranium-containing wastewater in a volume ratio of 3:7, and magnetic stirring was applied at 200rpm for adsorption for 8h. After the adsorption was completed, the mixed solution was 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, 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 obtained in Example 1 for removing uranium-contaminated wastewater 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 under magnetic stirring at 200 rpm for 8 hours. After the adsorption was completed, 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, 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 specification. Figure 2 shown.

[0049] The adsorption solution for removing uranium contaminated wastewater obtained in Example 2 and Comparative Example 1 was mixed with the simulated uranium-containing wastewater at a volume ratio of 3:7, and magnetic stirring adsorption was carried out at 200 rpm for 8 h. After the adsorption was completed, the mixed solution was suction filtered, the pore size of the filter paper was 0.22 μm, and azo arsenic III was added to the filtrate. After stirring uniformly, the absorbance of uranyl ions in the filtrate was detected by spectrophotometry, and the adsorption amount of the adsorption solution for uranyl ions in the simulated uranium-containing wastewater was calculated. The specific test results are shown in Table 1. Figure 3

[0050] A strontium contaminant aqueous solution (solute: strontium nitrate) with a concentration of 32 ppm was prepared as simulated strontium-containing wastewater. The adsorption solution for removing uranium contaminated wastewater obtained in Example 1 was mixed with the simulated uranium-containing wastewater and the simulated strontium-containing wastewater at a volume ratio of 3:7, respectively, and magnetic stirring adsorption was carried out at 200 rpm for 8 h. After the adsorption was completed, the mixed solution was suction filtered, the pore size of the filter paper was 0.22 μm, and azo arsenic III was added to the filtrate. After stirring uniformly, the absorbance of uranyl ions in the filtrate was detected by spectrophotometry, and the adsorption amount of the adsorption solution for uranyl ions in the simulated uranium-containing wastewater was calculated. The specific test results are shown in Table 2. Figure 4

[0051] Based on the above ideal embodiments according to the present application, through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content of the specification, and 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 to deionized water and stirring to dissolve uniformly to obtain a whey protein solution with a mass concentration of 0.02 g / mL; (2) A pH regulator is added to the whey protein solution to adjust the solution to alkaline or acidic. 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 regulator in step (2), the solution pH is 2-12.

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

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