Preparation of amidoxime modified magnetic nano biological adsorbent and method for adsorbing low-concentration uranium by utilizing amidoxime modified magnetic nano biological adsorbent

A biological adsorbent and magnetic nanotechnology, applied in chemical instruments and methods, adsorption water/sewage treatment, alkali metal compounds, etc., can solve the problems of low adsorption efficiency, low recycling rate, high production cost, etc., and achieve high adsorption rate High, stable adsorption effect, good adsorption effect

Active Publication Date: 2018-01-05
NANHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the adsorption method has defects such as high production cost, low adsorption efficiency, and low recycling rate in the process of treating low-concentration uranium wastewater.

Method used

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  • Preparation of amidoxime modified magnetic nano biological adsorbent and method for adsorbing low-concentration uranium by utilizing amidoxime modified magnetic nano biological adsorbent
  • Preparation of amidoxime modified magnetic nano biological adsorbent and method for adsorbing low-concentration uranium by utilizing amidoxime modified magnetic nano biological adsorbent
  • Preparation of amidoxime modified magnetic nano biological adsorbent and method for adsorbing low-concentration uranium by utilizing amidoxime modified magnetic nano biological adsorbent

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Experimental program
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Effect test

specific Embodiment approach

[0038] The preparation of the adsorbent provided by the invention and the specific steps of adsorbing low-concentration uranium are:

[0039] (1) Weigh 6.8g FeCl 3 ·6H 2 0 In the Erlenmeyer flask, add 400ml of ethylene glycol solution, after stirring for 15min, an orange-yellow clear liquid is obtained, add 18g of anhydrous sodium acetate and 5g of trisodium citrate, continue stirring for 1h, and pour the solution into a high-temperature reaction kettle, React at 200°C for 10h, cool to room temperature naturally, wash with distilled water and ethanol several times, and dry in vacuum at 50°C for 24h to obtain nano-Fe 3 o 4 ;

[0040] (2) Take 1g nanometer Fe 3 o 4 In the Erlenmeyer flask, add 50ml of toluene solution, after ultrasonication for 20min, add 1.34ml of (2-cyanoethyl)triethoxysilane, and react for 48h at 100°C under the condition of nitrogen gas, wash with ethanol several times, at 50 After vacuum drying at ℃ for 24 hours, the nano-Fe modified with cyano group ...

Embodiment 1

[0044] IV embodiment 1 The preparation of the adsorbent provided by the patent of the present invention:

[0045] (1) Preparation of Aspergillus niger powder

[0046] Gently scrape the cultivated fungal solid slant with an inoculation loop to prepare 500 mL of bacterial suspension with an OD value of 0.1, inoculate it into the PDA liquid medium at an inoculum amount of 2 / 1000, and inoculate in a shaker (30°C, 150rpm ) for extended cultivation for 60 hours. After a large amount of mycelia grew on the surface of the culture medium, the mycelium was taken out, washed with ultrapure water, put into an oven at 30°C for 24 hours, and ground through a 100-mesh standard inspection sieve with a pulverizer to collect 100 Aspergillus niger powder of the following order;

[0047] (2) Nano-Fe modified by amidoxime 3 o 4 preparation of

[0048] Weigh 6.8g FeCl 3 ·6H 2 O in a conical flask, add 400ml ethylene glycol solution, stir for 15min to obtain an orange-yellow clear liquid, add ...

Embodiment 2

[0051] Example 2, respectively pipette 20 mL of uranium solution with an initial concentration of 10 mg / L in a 50 mL Erlenmeyer flask, and sequentially adjust the pH value of the solution to 2, 3, 4, 5, 6, 7, 8, 9 in triplicate, Add 0.010g magnetic nano-Fe respectively 3 o 4 - Aspergillus niger biosorbent / 0.010g The adsorbent provided by the patent of the present invention, oscillating and adsorbing in a constant temperature culture shaker with a rotation speed of 150rpm at 25°C, counting from the time when the adsorbent is added to the solution, oscillating and adsorbing for 300min, and measuring the residual uranium in it concentration. When the pH is 2-9, the magnetic nano-Fe 3 o4 -The adsorption rate of Aspergillus niger biosorbent is 19.17%, 21.61%, 33.33%, 50.85%, 61.83%, 76.36%, 53.18%, 22.92%; the adsorption rate of ANFAN is 5.04%, 7.5%, 39.04%, 78.89%, 10.5%, 7.39%, 6.76%. It can be seen that the magnetic nano-Fe 3 o 4 - The Aspergillus niger biosorbent reaches ...

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Abstract

The invention relates to preparation of an amidoxime modified magnetic nano biological adsorbent and a method for adsorbing low-concentration uranium by utilizing the amidoxime modified magnetic nanobiological adsorbent. The preparation comprises the following steps: modifying magnetic nano Fe3O4 by utilizing amidoxime; grafting the amidoxime modified nano Fe3O4 on aspergillus niger through cross-linking reaction to obtain an amidoxime modified magnetic nano Fe3O4-aspergillus niger biological adsorbent. Lone pair electrons on an electron-donating group of the amidoxime based adsorbent and uranyl ions can form a coordination bond or a stable structure, so that the adsorption speed and the adsorption capacity of the material on the uranyl ions can be effectively improved. The uranium compatible property of the aspergillus niger, the magnetic property of the nano Fe3O4 and the high selectivity and affinity of an amidoxime group on the uranium are combined and the aspergillus niger is a biological material, so that the amidoxime modified magnetic nano biological adsorbent has the advantages of good adsorption property, simplicity in operation, low production cost, low energy consumption, easiness for solid-liquid separation and the like; the product has a good application prospect in the fields of prevention and control of radioactive pollution and uranium cyclic utilization.

Description

technical field [0001] The invention relates to the field of preparation of functionalized magnetic nano-biological materials and the adsorption treatment of uranium-contaminated water bodies, in particular to a magnetic nano-Fe modified by amidoxime 3 o 4 Preparation of biosorbent cross-linked with Aspergillus niger and method for treating low-concentration uranium-containing wastewater. Background technique [0002] As a very important strategic resource in the field of nuclear power industry and nuclear technology application, uranium is also a radioactive heavy metal element. During the development and utilization of uranium, a large amount of uranium-containing wastewater is produced, and the concentration of uranium can still reach 5 mg L after preliminary treatment. -1 Around, far higher than the national emission standards. As a radionuclide with both chemical and radiotoxicity, uranium will spread to the ecosphere along with surface runoff and underground seepage...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28
Inventor 李乐成彬唐双阳戴仲然廖琪卢炜
Owner NANHUA UNIV
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