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A method for preparing plant-organic composite adsorbent for extracting uranium from seawater by modifying camphor tree leaves with tributyl phosphate

A technology of tributyl phosphate and composite adsorption, applied in chemical instruments and methods, radioactive purification, improvement of process efficiency, etc., can solve the problems of difficult recycling, low adsorption efficiency, small adsorption capacity, etc., and achieve good chemical and The effect of mechanical stability, high adsorption efficiency and large adsorption capacity

Active Publication Date: 2019-01-18
NANHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the complex composition of seawater, under alkaline conditions, and the extremely low concentration of uranium, it has brought many difficulties to the extraction of uranium in seawater, such as low adsorption efficiency, poor selectivity, and small adsorption capacity.
However, most of the adsorption materials reported in the literature still have low adsorption efficiency, high production cost, and difficulty in recycling and reuse for aqueous media with low uranium concentration in practical applications, especially for the lack of ideal adsorption materials for the extraction of uranium in seawater.

Method used

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  • A method for preparing plant-organic composite adsorbent for extracting uranium from seawater by modifying camphor tree leaves with tributyl phosphate
  • A method for preparing plant-organic composite adsorbent for extracting uranium from seawater by modifying camphor tree leaves with tributyl phosphate
  • A method for preparing plant-organic composite adsorbent for extracting uranium from seawater by modifying camphor tree leaves with tributyl phosphate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation of embodiment 1 adsorbent

[0027] 1. Preparation of reagents required for the experiment

[0028] Uranium standard stock solution: weigh 1.17929 g U 3 o 8 (mass fraction>99.8%, CNNC 272 Uranium Industry Co., Ltd.), placed in a 100 mL beaker. Add 10 mL HCL, 3 mLH 2 o 2 , two drops of HNO 3 , cover with a watch glass, and after the violent reaction stops, heat it on a sand bath until it is completely dissolved and brown smoke no longer appears, take it out and cool slightly, transfer it to a 1000 mL volumetric flask, add water to the mark, and shake well , which is 1 g / L uranium standard stock solution (concentration required for the preparation of experiments before use).

[0029] Tributyl phosphate-hydrochloric acid mixed solution: Measure 10 mL of hydrochloric acid solution with a concentration of 1 mol / L (Hengyang Xunyuan Chemical Reagent Co., Ltd.) into the Erlenmeyer flask, and then add 30 mL of tributyl phosphate (Hunan Huihong Reagent Co., ...

Embodiment 2

[0034] Adsorption performance of embodiment 2 adsorbent

[0035] 1. The influence of adsorption time, adsorbent dosage and initial concentration on the adsorption performance of adsorbent

[0036] The present invention investigates the adsorption efficiency of camphor tree original leaf powder and tributyl phosphate modified powder to uranium in uranium solution, takes 50 mL of uranium solution, adjusts the pH to 8.3, adds 0.02 g of adsorbent, and reacts at 25 °C. figure 1 The original powder was reacted for 60 minutes to reach adsorption equilibrium, and the maximum adsorption efficiency was 83.2%, and the modified powder was reacted for 40 minutes to reach adsorption equilibrium, and the maximum adsorption efficiency was 92.5%. The results showed that the modification of camphor tree leaf powder with tributyl phosphate increased the adsorption efficiency, accelerated the adsorption rate and shortened the equilibrium time.

[0037] figure 2 It is the adsorption of tributyl...

Embodiment 3

[0053] Example 3 Adsorption of uranium in simulated seawater

[0054] Simulated seawater sample composition content (µg / L): Cl - (1.91×10 7 ), Na + (1.08×10 7 ), Mg 2+ (1.33×10 6 ), Ca 2+ (4.22×10 5 ), Zn 2+ (4.0), K + (3.08×10 6 ), U(3.0-3.3), Fe 3+ (1.0-2.0), Cu 2+ (0.6), Pb 2+ (0.03), Co 2+ (0.05), HCO 3 - (2.0×10 4 )Wait. Measure 50 mL of simulated seawater aqueous solutions with initial uranium concentrations of 3.2 µg / L, 5.0 µg / L, and 10 µg / L, adjust the pH of the solution to pH 8.3, and add 0.02 g of tributyl phosphate modified camphor leaves to extract uranium from seawater. For the plant-organic composite adsorbent, shake for 180min in a shaker at 298 K and 150 r / min. The adsorbent separated after centrifugation was washed and dried, then transferred to a 100 mL Erlenmeyer flask, and then 50 mL of 0.25 mol / L nitric acid was added, and desorbed by shaking at 298K, 150 r / min for 2 h. After centrifugation and suction filtration of the sample, the conce...

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Abstract

The invention relates to a method for preparing a plant and organic composite adsorbent for extracting uranium from seawater by adopting tributyl phosphate modified camphor tree leaves. The method comprises the following steps of modifying plant leaf powder by using tributyl phosphate; then performing activating, washing and vacuum drying on an obtained product to obtain the organic composite adsorbent of the plant, wherein the adsorbent is applied to the aspect of adsorbing the uranium from the seawater and has the advantages that raw materials are wide in source and are conveniently obtained; the preparation process is simple, the requirement on an instrument and equipment is not high and the cost is lower; the adsorbent is used for adsorbing the uranium from the seawater, and is high in adsorbing efficiency and adsorbing capacity; the adsorbing speed is high, so that adsorbing balance can be reached in short time; the adsorbent has higher selective specific adsorbing property for uranium in an alkaline seawater solution environment with complex components.

Description

technical field [0001] The invention relates to extracting uranium from seawater, in particular to a method for preparing a plant-organic composite adsorbent for extracting uranium from seawater by modifying camphor tree leaves with tributyl phosphate. Background technique [0002] Nuclear power generation has the advantages of low pollution, large power generation, and high efficiency. Under the background of the global development of low-carbon environmental protection economy, it is the best choice to replace conventional land energy. Uranium is an indispensable fuel for the production of nuclear energy. The average annual consumption in the world is about 7.0×10 7 Kg of uranium is basically extracted from terrestrial uranium resources. However, the uranium resources suitable for mining in the world are only 3.0×10 9 Kg, even counting low-grade uranium ore and its by-product uranium compounds, as well as all stocks and spent uranium, the total amount will not exceed 5....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/30G21F9/12C22B60/02
CPCB01J20/22B01J20/24B01J2220/44B01J2220/4812B01J2220/485C22B60/0217G21F9/12Y02P10/20
Inventor 丁德馨薛金花胡南张辉赵维超王永东李乐李广悦李峰
Owner NANHUA UNIV