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Rhodanile functionalized MOFs (metal-organic frameworks) adsorbing agent, preparation method thereof and application of adsorbing agent

A functionalized and adsorbent technology, applied in the field of rhodamine functionalized MOFs adsorbent and its preparation, can solve the problems of incapable metal ion adsorption and separation, limited reusability, poor selectivity, etc.

Active Publication Date: 2019-04-05
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although a large number of experimental studies have shown that MOFs have special selective adsorption and separation capabilities for gas molecules, dyes, drugs, and even organic isomers, most MOFs are poorly stable in aqueous solution, which greatly affects It limits its application in wastewater treatment; and, for the adsorption and separation of metal ions, due to the lack of redundant coordination sites in MOFs, its adsorption effect on external metal ions is very weak, which greatly limits the use of MOFs as metal adsorbents. application, and because the radii of most metal ions are very similar, it is not possible to effectively adsorb and separate metal ions through the advantage of pore size
For example, in 2015, Cheng et al [Cheng X, Liu M, Zhang A F, et al, Nanoscale, 2015, 7, 9738-9745] modified MIL-53(Al) with sulfhydryl groups and successfully synthesized sulfhydryl functionalized MIL-53( Al), has the ability to adsorb metal Ag(I), but it has the disadvantages of low adsorption capacity, slow adsorption rate, poor selectivity, and poor water stability limits its reusability

Method used

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  • Rhodanile functionalized MOFs (metal-organic frameworks) adsorbing agent, preparation method thereof and application of adsorbing agent
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  • Rhodanile functionalized MOFs (metal-organic frameworks) adsorbing agent, preparation method thereof and application of adsorbing agent

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preparation example Construction

[0048] The present invention provides the preparation method of rhodanine functionalized MOFs adsorbent described in the above technical scheme, comprising the following steps:

[0049] (1) ZrCl 4 The organic solution is mixed with the carboxylic acid organic ligand to obtain the MOFs synthesis material liquid;

[0050] (2) Mixing the MOFs synthetic feed solution obtained in the step (1) with rhodanine acid, and performing a hydrothermal reaction to obtain a rhodanine functionalized MOFs adsorbent.

[0051] In the present invention, unless otherwise specified, the raw materials used are commercially available products well known to those skilled in the art.

[0052] The present invention will ZrCl 4 The organic solution is mixed with the carboxylic acid organic ligand to obtain the MOFs synthesis material liquid. In the present invention, the ZrCl 4 ZrCl in organic solution 4 The dosage ratio of the organic solvent is preferably 1mmol: 45-55mL, more preferably 1mmol: 45-5...

Embodiment 1

[0113] (1) 0.24g (about 1.03mmol) ZrCl 4 Uniformly dissolved in 50mL N,N-dimethylformamide (DMF), ultrasonically stirred for 20min to obtain a clear solution, then 0.18g (about 1.08mmol) organic ligand 2-aminoterephthalic acid was added, and ultrasonically stirred for 30min , until the solid is completely dissolved to obtain a mixed material liquid;

[0114] (2) 0.96g (5mmol) rhodanine-3-acetic acid was added to the mixed material liquid obtained in step (1), and ultrasonic stirring was continued for 30min. After the solid was completely dissolved to obtain a clear solution, it was transferred to a 100mL reaction kettle, Put it in an oven at 120°C for 48 hours;

[0115] (3) filter after being cooled to room temperature, the precipitate obtained is repeatedly washed several times with DMF, methanol and dichloromethane mixed organic solvent;

[0116] (4) Put the washed product in a vacuum oven at 80°C to dry for 12 hours, and grind to obtain a lavender powder with a particle s...

Embodiment 2

[0118] The rhodanine functionalized MOFs adsorbent was prepared according to the method of Example 1, the difference was that in step (1), the organic ligand used was terephthalic acid, and the dosage was 0.16 g. The rhodanine functionalized UiO-66 MOFs adsorbent (denoted as UiO-66-5Rd-A) was obtained.

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Abstract

The invention belongs to the technical field of adsorbing agents for heavy metal pollutants in water, and provides a Rhodanile functionalized MOFs (metal-organic frameworks) adsorbing agent, a preparation method thereof and an application of the adsorbing agent. The adsorbing agent comprises Ui-O-66 MOFs substrates and modified Rhodanile groups. The Ui-O-66 MOFs substrates have the advantages thatthe substrates are large specific surface area, high in porosity and stable in structure, surfaces of the substrates are easily modified and the like. The Rhodanile groups and the Ui-O-66 MOFs substrates can be combined through a compound containing the Rhodanile groups and Zr-O clusters of the Ui-O-66 MOFs substrates in a matched manner or a compound containing the Rhodanile groups and amidationof the Ui-O-66 MOFs substrates, the Rhodanile groups are modified on the surface of Zr-MOFs, and high-selectivity adsorption of metal silver in water is achieved.

Description

technical field [0001] The invention belongs to the technical field of adsorbents for heavy metal pollutants in water bodies, and in particular relates to a rhodanine functionalized MOFs adsorbent and a preparation method and application thereof. Background technique [0002] There are a lot of silver ions in industrial wastewater, if it is not treated, it will have a serious impact on the ecological environment and human health. Moreover, silver is a precious metal with high market value, and the recovery of silver ions in wastewater can also obtain certain economic benefits. Adsorption is one of the most commonly used methods to remove silver ions in water, which has the advantages of low cost, high efficiency, and simple operation. Traditional adsorption materials, such as activated carbon, silica, and carbon nanotubes, have disadvantages such as low adsorption capacity, slow adsorption rate, and poor selective adsorption capacity in complex actual wastewater treatment. ...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F101/20
CPCB01J20/226C02F1/285C02F2101/20
Inventor 罗旭彪丁琳罗于邵鹏辉刘玲玲殷晓翠余海燕张亚昆余水平
Owner NANCHANG HANGKONG UNIVERSITY
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