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Physical and chemical synergistic anti-fouling type seawater uranium extraction adsorbent and preparation method thereof

An anti-fouling and adsorbent technology, applied in chemical instruments and methods, seawater treatment, other chemical processes, etc., can solve problems such as difficult to meet the needs of the marine environment, high adsorption capacity and adsorption efficiency, and increase the difficulty of adsorbent adsorption. Achieve high stability, good adsorption capacity, and many adsorption sites

Active Publication Date: 2019-01-25
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the pH of the actual marine environment is about 8.3, and there is still a large amount of OH - , CO 3 2- etc., leading to the diversification of uranium ions (such as: UO 2 Oh + , (UO2) 2 (OH) 2+ , UO 2 (CO 3 ) 2- etc.), which greatly increases the difficulty of adsorption of U(VI) by adsorbents, so that most adsorbents cannot guarantee high adsorption capacity and adsorption efficiency in weakly alkaline environments, and it is difficult to meet the special marine environmental requirements.

Method used

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  • Physical and chemical synergistic anti-fouling type seawater uranium extraction adsorbent and preparation method thereof
  • Physical and chemical synergistic anti-fouling type seawater uranium extraction adsorbent and preparation method thereof
  • Physical and chemical synergistic anti-fouling type seawater uranium extraction adsorbent and preparation method thereof

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Effect test

Embodiment 1

[0044] In this embodiment, step 1 is: the prepared two-dimensional carbon-based material is graphite oxide with a sheet structure, and the chemical antifouling agent is silver ion.

[0045] Specifically, the specific steps for preparing graphite oxide with a two-dimensional carbon-based material in a sheet structure include: adding 5 g of natural graphite and 120 mL of concentrated sulfuric acid (V / V 98%) to a round bottom flask under ice bath conditions, and stirring for 2 hours , Then add 20g potassium permanganate in batches (add 30 times), stir for 4h, raise the temperature to 50℃ and keep it for 1h, then add 400mL deionized water to the system, raise the temperature to 95℃, keep it for 15min, then cool to 50℃, add 300mL deionized water, then add 70g hydrogen peroxide (V / V30%) ​​to remove excess KMnO 4 After centrifugation, the solid was washed with hydrochloric acid and deionized water until the pH of the supernatant was greater than 6, which was slightly acidic. The product ...

Embodiment 2

[0052] The method of this embodiment is basically the same as that of embodiment 1, except that: Step 1 is that the two-dimensional carbon-based material prepared is carbon nitride with a sheet structure, and the chemical antifouling agent is silver ion.

[0053] Specifically, the specific steps for preparing carbon nitride with a two-dimensional carbon-based material in a lamellar structure include: putting 2.0 g of melamine in a crucible with a lid, and heating in a muffle furnace for 2 hours at a heating rate of 20°C min. -1 ; Then heating at 520℃ for 2h, and then at 500℃ for 2h to get the carbon nitride with graphite photo layer structure.

[0054] A physical and chemical synergistic anti-fouling adsorbent for seawater uranium extraction obtained in this example is basically the same as the adsorbent in Example 1, and is characterized in that the adsorbent has both a carbon nitride sheet structure and an imidazole ester framework material. Rhombic dodecahedron structure; the siz...

Embodiment 3

[0056] The method of this embodiment is basically the same as that of embodiment 1, except that: Step 1 is to prepare a two-dimensional carbon-based material containing Fe 3 O 4 The graphite oxide of the particle magnetic sheet structure, the chemical antifouling agent is silver ion.

[0057] Specifically, the preparation of two-dimensional carbon-based materials contains Fe 3 O 4 The specific steps of graphite oxide with magnetic sheet structure of particles include: adding 5g natural graphite and 120mL concentrated sulfuric acid (V / V 98%) into a round bottom flask under ice bath conditions, stirring for 2h, and then adding in batches 20g potassium permanganate (add 30 times), after stirring for 4h, raise the temperature to 50℃ and keep it for 1h, then add 400mL deionized water to the system, raise the temperature to 95℃, keep for 15min, then cool to 50℃, add 300mL to remove Ionized water, then add 70g hydrogen peroxide (V / V 30%) to remove excess KMnO 4 After centrifugation, the ...

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Abstract

The invention provides a physical and chemical synergistic anti-fouling type seawater uranium extraction adsorbent and a preparation method thereof. The method includes the steps that firstly, a two-dimensional carbon-based material is dispersed into methanol, a chemical anti-fouling agent and central metal ions are added, and ultrasonic treatment is carried out; then, a 2-methylimidazole methanolsolution is added for a reaction; then, the reaction product is washed with absolute ethanol and methanol respectively and subjected to centrifugal separation; finally, drying is carried out. The inhibition ratio of the adsorbent on phaeodactylum tricornutum can reach 90% or above; due to the synergistic effect of the two-dimensional carbon-based material and the doped metal ions on an imidazateframework material, the saturated adsorption capacity of the adsorbent can be increased by 120-150% compared with pure MOF and carbon-based materials, the optimal pH condition for overall adsorption of the adsorbent is improved at the same time and is closer to that of the seawater environment, and thus the adsorption efficiency can be improved.

Description

Technical field [0001] The present invention relates to an adsorbent material. The present invention also relates to a preparation method of the adsorbent material, in particular to a seawater uranium extraction adsorbent that utilizes physical stress and chemical effects to synergistically resist fouling and its synthesis method. Background technique [0002] With the increasing global energy demand, nuclear energy as a clean energy will be regarded as the main energy source for future social development. Among them, uranium is a well-known radioactive material for nuclear energy, and its huge resource supply provides an important guarantee for sustainable nuclear energy production. However, uranium reserves can only last less than a century at the current rate of consumption. In recent years, due to the abundant reserves of uranium resources (about 4.5 billion tons) in the ocean, it has attracted widespread attention from scientific researchers. A variety of adsorbents have be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24C02F1/28C22B60/02C02F103/08
CPCB01J20/20B01J20/24C02F1/288C02F2103/08C22B60/0204
Inventor 王君郭雪洁张宏森刘琦刘婧媛陈蓉蓉于静宋大雷
Owner HARBIN ENG UNIV
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