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

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 and low rare earth adsorption capacity, and achieve large adsorption capacity and preparation Convenient and widely applicable effects

Active Publication Date: 2019-11-05
LIAONING UNIVERSITY
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  • 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 preparation method and application thereof
  • Metal organic framework material with petal-shaped core-shell structure and preparation method and application thereof
  • Metal organic framework material with petal-shaped core-shell structure and preparation method and application thereof

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 material 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 19ml of anhydrous methanol for 1h, then add 20mg of PVP and stir for 12h, then add 0.2g of zinc nitrate hexahydrate and stir for 12h, then add 0.25g of 2-methylimidazole, stir After 45min, centrifuge and dry to obtain the target product UiO-66-NH adsorbent with petal-shaped core-shell structure 2 @ZIF-8.

[0035] (2) Metal-organic fr...

Embodiment 2

[0039] Example 2 UiO-66-NH 2 Adsorption effect of @ZIF-8 on Nd(III), Eu(III), Gd(III), Er(III) at 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 20mg·g respectively -1 , 30mg·g -1 , 50mg·g -1 , 80mg·g -1 , 100mg·g -1 , 150mg·g -1 , 200mg·g -1 , 300mg·g -1 , 500mg·g -1 Rare earth ion solution, adjust the pH to 5. Weigh 10mgUiO-66-NH respectively 2 @ZIF-8, adding 10mL concentration is 20~500mg L -1 Nd(III), Eu(III), Gd(III), Er(III) solutions, the pH of the solutions are all 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 the adsorbent for rare earth follows the order of Nd(III)2 @ZIF-8 can efficiently recover rare earth ions.

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Abstract

The invention is applied to 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 preparation method is as follows: 1) zirconium tetrachloride, 2-aminoterephthalic acid, glacial acetic acid and N, N-dimethylformamide are taken and stirred at room temperature, then transferred into a hydrothermal reaction kettle to react for 24 hours at 120 DEG C, cooled to room temperature, and washed to obtain UiO-66-NH2; and 2) weighing and ultrasonically dispersing the UiO-66-NH2 in absolute methanol, adding PVP for stirring, adding zinc nitrate hexahydrate for stirring, then adding 2-methylimidazole, stirring and centrifugally drying to obtain petal-shaped core-shell structure adsorbent UiO-66-NH2@ZIF-8. The preparation method is simple, green and pollution-free, and the prepared adsorbent has high separation and enrichment efficiency for rareearth elements and 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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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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