Method for preparing plant-inorganic composite adsorbents from phosphoric-acid-modified folium cycas for extracting uranium from seawater

An inorganic composite and adsorbent technology, applied in seawater treatment, chemical instruments and methods, adsorbed water/sewage treatment, etc., can solve the problems of difficult recycling, low adsorption efficiency, high production cost, and achieve good chemical and mechanical stability. The effect of high stability, fast adsorption rate and low cost

Active Publication Date: 2016-06-22
NANHUA UNIV
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  • Application Information

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Problems solved by technology

However, these materials still have defects such as low adsorption efficiency, high production cost, and difficulty in recyclin

Method used

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  • Method for preparing plant-inorganic composite adsorbents from phosphoric-acid-modified folium cycas for extracting uranium from seawater
  • Method for preparing plant-inorganic composite adsorbents from phosphoric-acid-modified folium cycas for extracting uranium from seawater
  • Method for preparing plant-inorganic composite adsorbents from phosphoric-acid-modified folium cycas for extracting uranium from seawater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation of embodiment 1 adsorbent

[0028] 1. Preparation of reagents required for the experiment

[0029] Uranium standard stock solution: weigh 1.17929gU 3 o 8 (mass fraction>99.8%, CNNC 272 Uranium Industry Co., Ltd.), placed in a 100mL beaker. Add 10mLHCL, 3mLH 2 o 2 , two drops of HNO 3 , Cover the watch glass, after the violent reaction stops, heat it on the sand bath until it is completely dissolved, take it off and cool it slightly, transfer it to a 1000mL volumetric flask, add water to the mark, shake well, the concentration is 1mg / mL.

[0030] Uranium solutions with different concentrations: Take different volumes of 1mg / mL uranium standard stock solution and dilute to prepare uranium solutions with required concentrations.

[0031] 1.0mol / L Na 2 CO 3 solution; 0.02mol / L HCl solution; 1.0mol / L HNO 3 Solution, diluted in turn to the concentration required for the experiment; 0.25mol / L ammonium oxalate solution; concentrated phosphoric acid

[...

Embodiment 2

[0036] The preparation of embodiment 2 adsorbents

[0037] The difference with embodiment 1 is:

[0038] Weigh 10g of iron leaf powder and place it in a 100mL reaction kettle, add 2.0mL of concentrated phosphoric acid, then add 50mL of deionized water, put it in a vacuum drying oven, perform physical and chemical modification at 180°C for 12h, take out the product, filter it, and use Activated with absolute ethanol, washed with distilled water until neutral, and then vacuum-dried at 60°C for 6 hours to obtain the adsorbent.

Embodiment 3

[0039] The preparation of embodiment 3 adsorbent

[0040] The difference with embodiment 1 is:

[0041] Weigh 10g of iron leaf powder and place it in a 100mL reaction kettle, add 2.6mL of concentrated phosphoric acid, then add 50mL of deionized water, put it in a vacuum drying oven, perform physical and chemical modification at 200°C for 8 hours, take out the product, filter it, and wash it with absolute ethanol Activated, washed with distilled water until neutral, and then vacuum-dried at 60°C for 6 hours to obtain the adsorbent.

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Abstract

The invention relates to the field of extraction of uranium from seawater, and particularly provides a method for preparing plant-inorganic composite absorbents from phosphoric-acid-modified folium cycas for extracting uranium from seawater.The method includes drying and smashing folium cycas leaves; modifying the folium cycas leaves by the aid of phosphoric acid to obtain products; washing, drying and activating the products to obtain the biological adsorbents for extracting the uranium from the seawater.The method has the advantages that the plant-inorganic composite adsorbents are high in adsorption efficiency when applied to adsorbing the uranium from the simulated seawater under the conditions that a pH (potential of hydrogen) value is 8.7, the temperature is 25 DEG C and the adsorption equilibrium time is 240 min; the adsorbents can be reused after the uranium is adsorbed and the adsorbents are desorbed by the aid of 0.08 mol/L nitric acid, and the high adsorption efficiency can be kept; the adsorbents are made of materials from wide sources and are easy to prepare and desorb, low in cost, high in mechanical strength and little in environmental pollution, good adsorption effects can be realized, and the like.

Description

technical field [0001] The invention relates to extracting uranium from seawater, in particular to a method for preparing a plant-inorganic composite adsorbent for extracting uranium from seawater by using phosphoric acid modified iron leaves. Background technique [0002] As an economical and clean energy, nuclear energy can effectively alleviate the pressure of energy shortage. Uranium is an indispensable fuel for the production of nuclear energy. At present, the production capacity of natural uranium in China can only meet 1 / 3 of the demand, and the supply of uranium is under great pressure. It is predicted that terrestrial uranium resources will be exhausted by 2050. Sea water contains a large amount of uranium resources, which will be one of the main ways to solve the future supply of nuclear fuel. Therefore, the development of adsorbents for seawater uranium extraction has important application value. [0003] Currently, uranium extraction methods mainly include ch...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C22B60/02C02F103/08
CPCB01J20/24C02F1/286C02F2103/08C22B60/0204
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
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