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Metal-organic framework material with petal-shaped core-shell structure and its preparation method and application

A metal-organic framework and core-shell structure technology, applied in chemical instruments and methods, other chemical processes, process efficiency improvement, etc., can solve the problems of slow kinetic behavior, low rare earth adsorption capacity, etc., and achieve short processing cycle and porous Good performance and wide application

Active Publication Date: 2022-01-14
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, these studies have relatively low adsorption capacity for rare earths and slow kinetic behavior.

Method used

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  • Metal-organic framework material with petal-shaped core-shell structure and its preparation method and application
  • Metal-organic framework material with petal-shaped core-shell structure and its preparation method and application
  • Metal-organic framework material with petal-shaped core-shell structure and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]Example 1 Metal-organic framework material UiO-66-NH with petal-shaped core-shell structure 2 Preparation of @ZIF-8

[0032] (1) Metal-organic framework UiO-66-NH with petal-like core-shell structure 2 Preparation of @ZIF-8: The synthesis process is as follows figure 1 as shown,

[0033] 1) Take 0.0745g of zirconium tetrachloride, 0.072g of 2-aminoterephthalic acid, 5.5mL of glacial acetic acid and 50mL of N,N-dimethylformamide and stir at room temperature. ℃ for 24h, cooled to room temperature, and the obtained UiO-66-NH after washing 2 .

[0034] 2) Weigh 10mg UiO-66-NH 2 In a round bottom beaker, ultrasonically disperse in 19 ml of anhydrous methanol for 1 hour, then add 20 mg of PVP and stir for 12 hours, then add 0.2 g of zinc nitrate hexahydrate and stir for 12 hours, then add 0.25 g of 2-methylimidazole, After stirring for 45 minutes, centrifuge and dry to obtain the target product, the petal-shaped core-shell structure adsorbent UiO-66-NH 2 @ZIF-8.

[...

Embodiment 2

[0039] Example 2 UiO-66-NH 2 Adsorption effect of @ ZIF-8 on Nd(III), Eu(III), Gd(III), Er(III) under different acidity

[0040] 1. Method: weigh 10mg UiO-66-NH respectively 2 @ZIF-8, add 10mL respectively to a concentration of 30mg L -1 Nd(III), Eu(III), Gd(III), Er(III) solutions, the pH of the solutions are 2, 3, 4, 5, 6 respectively, shake in a shaking box at 30°C and 180r / min for 24h . UiO-66-NH 2 The process of @ZIF-8 adsorbing Nd(III) is as follows figure 1 As shown, the adsorption results are as Figure 2d .

[0041] 2. by Figure 2d It can be seen that with the increase of pH value, UiO-66-NH 2 The adsorption rate of @ ZIF-8 to rare earth ions gradually increases, and at pH=5, the adsorption rate of rare earths is over 90%, so as to achieve the rare earth elements Nd(III), Eu(III), Gd(III), Recovery of Er(III).

Embodiment 3

[0042] Example 3 UiO-66-NH 2 Adsorption isotherms of Nd(III), Eu(III), Gd(III), Er(III) on @ZIF-8 adsorbent

[0043] 1. Method: prepare the concentration of 20 mg∙g respectively -1 , 30 mg∙g -1 , 50 mg∙g -1 , 80 mg∙g -1 , 100 mg∙g -1 , 150 mg∙g -1 , 200 mg∙g -1 , 300 mg∙g -1 , 500 mg∙g -1 Rare earth ion solution, adjust the pH to 5. Weigh 10mg UiO-66-NH respectively 2 @ ZIF-8, add 10mL concentration is 20 ~ 500mg L -1 Nd(III), Eu(III), Gd(III), Er(III) solutions, the pH of the solution is 5, shake in a shaking box at 30°C and 180r / min for 24h. The result is as image 3 .

[0044] 2. by image 3 It can be seen that UiO-66-NH 2 The maximum adsorption capacities of @ZIF-8 for rare earth ions for Nd(III), Eu(III), Gd(III) and Er(III) are 249.90, 295.28, 316.22 and 340.95 mg g, respectively -1 . The maximum adsorption capacity of adsorbents for rare earths follows the order of Nd(III) 2 @ZIF-8 can efficiently recover rare earth ions.

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Abstract

The invention is applied in the technical field of rare earth metal adsorption, and in particular relates to a metal organic framework material with a petal-shaped core-shell structure and a preparation method and application thereof. The technical scheme that adopts is as follows: 1) get zirconium tetrachloride, 2-aminoterephthalic acid, glacial acetic acid and N,N-dimethylformamide are stirred at room temperature, move into subsequently in the hydrothermal reactor, at 120 ℃ for 24h, cooled to room temperature, and the obtained UiO‑66‑NH after washing 2 , 2) Weigh UiO‑66‑NH 2 Ultrasonic dispersion in anhydrous methanol, then adding PVP and stirring, then adding zinc nitrate hexahydrate and stirring, then adding 2-methylimidazole, stirring and drying by centrifugation to obtain the petal-shaped core-shell structure adsorbent UiO-66-NH 2 @ZIF‑8. The preparation method is simple, green and pollution-free, and the prepared adsorbent has high separation and enrichment efficiency for rare earth elements, and has practical applicability.

Description

technical field [0001] The invention is applied in the technical field of rare earth metal adsorption, and in particular relates to a metal organic framework material with a petal-shaped core-shell structure and a preparation method and application thereof. Background technique [0002] Rare earth elements are 17 elements consisting of scandium (Sc), yttrium (Y) and 15 lanthanoids (Ln). Rare earth elements have developed rapidly due to their unique magnetic, electrical and optical properties, and have become the most important components in electric vehicles (Nd, La, Dy), optical fibers (Nd, Er, Eu) and energy-saving lamps (Gd, La, Eu, Tb, Yb). key elements of . Global interest in clean and green technologies has also significantly boosted the overall market value of rare earth elements. Therefore, rare earth metals have become an important raw material for my country's economy and further development. However, the limited global rare earth reserves (130 million tons) and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/22C02F1/28C22B3/24C22B59/00B01J20/30
CPCB01J20/226C22B3/24C02F1/285C22B59/00Y02P10/20
Inventor 熊英张蒙蒙单炜军王月娇娄振宁
Owner LIAONING UNIVERSITY
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