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Preparation method of cellulose-based amidoximation seawater uranium extraction adsorption microspheres

A technology based on amidoxime and adsorbing microspheres, which is applied in chemical instruments and methods, inorganic chemistry, alkali metal compounds, etc., can solve the problems of high cost, poor reusability, low adsorption rate, etc., and achieve low cost and preparation The method is simple and fast, and the effect of increasing the binding site

Pending Publication Date: 2021-06-04
ZHEJIANG SCI-TECH UNIV
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  • Application Information

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Problems solved by technology

[0005] In order to solve the problems existing in the background technology, the present invention provides a preparation method of cellulose amidoxime seawater uranium extraction adsorption microspheres, which solves the problem of low adsorption rate, high cost and poor reusability of existing seawater uranium extraction materials The problem

Method used

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  • Preparation method of cellulose-based amidoximation seawater uranium extraction adsorption microspheres
  • Preparation method of cellulose-based amidoximation seawater uranium extraction adsorption microspheres
  • Preparation method of cellulose-based amidoximation seawater uranium extraction adsorption microspheres

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Effect test

Embodiment 1

[0032] (1) Weigh 5g of cellulose powder, alkali and urea system solution sodium hydroxide (7wt%) / urea (12wt%) / water (81wt%) 95g, stir vigorously at low temperature for 4 hours to completely dissolve the cellulose powder to form homogeneous system.

[0033] (2) After the cellulose powder is completely dissolved to form a homogeneous system, take by weighing 18.5 g of acrylonitrile according to the molar ratio of cellulose powder and acrylonitrile molar ratio of 1:12, and add acrylonitrile dropwise to the step ( 1) The formed homogeneous system was vigorously stirred and reacted for 8 hours. After the reaction was completed, it was washed with pure water several times until neutral, centrifuged at a speed of 10,000 RPM for 20 minutes, and the insoluble matter below was collected, and vacuum-dried at 60°C for 12 hours to obtain the prepared cyanonitrile base cellulose.

[0034] (3) Weigh 2 g of prepared cyanoethyl cellulose and 18 g of N,N-dimethylformamide, and weigh hydroxylam...

Embodiment 2-6

[0042]Use 1mol / L hydrochloric acid and 0.1mol / L sodium hydroxide solution to adjust the pH of 250mg / L uranyl nitrate solution to pH=5, pH=6, pH=7, pH=8, pH=9 respectively.

[0043]

[0044]

Embodiment 7

[0046] The test of adsorption time on the adsorption effect of seawater extracting uranium is different from Example 1 in preparing 100 mL of uranyl nitrate solution of 500 mg / L, diluting it to 200 mg / L, and using 1 mol / L hydrochloric acid and 0.1 mol / L sodium hydroxide Adjust the pH of the solution to 6, weigh 5 mg of microspheres, add 8 mL of 0.1 mol / L sodium hydroxide, and activate in a water bath shaker at 180 RPM at a temperature of 30 ° C for 1 hour. After activating for 1 hour, wash with pure water for 3 times and then add 8 mL. 200mg / L uranyl nitrate solution with pH=6, water bath shaker 180RPM, adsorption at 30°C for 10 hours, sampling every 1 hour and measuring uranium ion concentration by arsine azo spectrophotometry. The results show that the extraction rate of uranium by the cellulose-based amidoximation adsorption microspheres reaches 73.21% in 1 hour, basically reaches the adsorption equilibrium in 6 hours, and the extraction rate of uranium reaches 94.64%.

[0...

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Abstract

The invention discloses a preparation method of cellulose-based amidoximation seawater uranium extraction adsorption microspheres. The method comprises the following steps: dissolving a cellulose-based macromolecular substance in an alkali and urea system solution, and violently stirring under a low-temperature condition until the cellulose-based macromolecular substance is completely dissolved and forms a homogeneous solution; then dropwise adding acrylonitrile into the homogeneous solution, reacting in an ice-water bath environment, centrifugally collecting the lower insoluble substance after the reaction is finished, washing the insoluble substance with pure water for multiple times to remove impurities, and drying to obtain cyanoethyl cellulose; and dissolving the obtained cyanoethyl cellulose in an organic solvent, then adding hydroxylamine hydrochloride and inorganic alkali into the solution to react, and dropwise adding the solution into a coagulating bath solution to obtain a product result. The preparation method is easy to operate, high in controllability and easy for industrial large-scale production, and the prepared product can be applied to the aspects of uranium extraction from seawater, heavy metal ion adsorption and gold reduction and enrichment.

Description

technical field [0001] The invention belongs to the field of biomass material utilization and adsorption materials, and in particular relates to a preparation method of cellulose-based amidoxime seawater uranium extraction adsorption microspheres. Background technique [0002] With the rapid development of modern society and over-exploitation of resources, less and less fossil energy available for human use and environmental pollution have made human beings face enormous challenges in terms of energy. Nuclear power has become a new energy source to solve this problem. Uranium is an important nuclear fuel resource, but uranium resources on land are quite limited, and there are billions of tons of uranium in the ocean. If it can be exploited and utilized, it will be of great significance to the development of my country's nuclear energy industry. [0003] At present, there are many research methods for extracting uranium from seawater, mainly including adsorption method, chemi...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C22B60/02C22B11/00
CPCB01J20/24B01J20/28021C22B60/0265C22B11/04
Inventor 吴铭榜刘士成叶昊马璐琳朱致远
Owner ZHEJIANG SCI-TECH UNIV
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