Metal organic framework foam material as well as preparation method and application thereof

A metal-organic framework and foam material technology, applied in separation methods, chemical instruments and methods, filtration separation, etc., can solve the problems of slowing down the filtration speed, increasing the difficulty and cost of recycling, and difficult to filter microplastics

Active Publication Date: 2020-10-23
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the filter paper has a relatively large filter pore size (20-25 μm), which may only filter out microplastics of more than ten microns, and it is difficult to effectively filter out microplastics of several microns or nanometers
For microfiltration (0.1-1μm), ultrafiltration (2-100nm) or nanofiltration (~2nm), although micro- or nano-scale microplastics can be filtered out, they have some shortcomings that cannot be improved, such as: 1) Their small pore size may slow down the filtration speed and even cause plugging, which will greatly hinder large-scale microplastic processing; 2) Filtration methods often need to be carried out under high pressure conditions, which may generate some energy Consumption, resulting in higher costs and 3) recovery cycle usually requires the use of high-pressure recoil technology, which greatly increases the difficulty and cost of recovery
In addition, although there have been some reports on the filtration of microparticles in seawater, they are mainly aimed at fine sand with a particle size greater than 5 μm in seawater.
To our knowledge, few studies have reported effective strategies for filtering microplastics

Method used

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  • Metal organic framework foam material as well as preparation method and application thereof
  • Metal organic framework foam material as well as preparation method and application thereof
  • Metal organic framework foam material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Under stirring, the ZrCl 4(90 mg, 0.39 mmol) and 2,5-dihydroxyterephthalic acid (77 mg, 0.39 mmol) were added to 30 mL of acetone, followed by sonication for 30 minutes. The mixed solution was transferred to a 50 ml stainless steel autoclave with a piece of MF (melamine formaldehyde resin, about 1 cm in thickness), and heated at 100° C. for 24 hours. After cooling to room temperature, the resulting foam was stirred and washed with acetone and ethanol three times (3 hours each time), and dried under vacuum at 120-150°C for 12 hours to obtain a metal-organic framework foam material containing hydroxyl functional groups UiO- 66-OH@MF. The obtained UiO-66-OH@MF was further characterized, and the UiO-66-OH content in UiO-66-OH@MF was detected to be ~25.4 wt%. The amount of metal salt and ligand was further regulated and increased in equal proportions (0.5-1.5), and a series of foam materials with different loadings were obtained, and the corresponding proportions were name...

Embodiment 2-5

[0029] In Example 1, the precursor material 2,5-dihydroxyterephthalic acid is added and replaced by terephthalic acid (2), 2-aminoterephthalic acid (3), 2-bromoterephthalic acid ( 4) or the precursor material of nitroterephthalic acid (5), then react under the same conditions, process the product, and obtain the corresponding foam material (UiO-66-X@MF, X=H, NH 2 , Br and NO 2 ).

[0030] Powder X-Ray diffraction (PXRD) was used to analyze the structures and morphologies of foam materials with different functional groups. The characterization and simulation diagrams are shown in figure 1 and image 3 .

[0031] The foam material prepared in the above implementation cases 1-5 is developed and applied to the filtration of microplastics:

[0032] The concentration is about 0.01g mL -1 Preparation of simulated microplastic dispersions. Add about 0.2 g of plastic micropowder (including polyvinylidene fluoride PVDF, polymethyl methacrylate PMMA or polystyrene PS) to 200 mL of ...

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Abstract

The invention discloses metal organic framework foam materials as well as a preparation method and application thereof in micro-plastic filtration. The preparation method comprises steps: a Zr salt and terephthalic acid or functional group substituted terephthalic acid are added into acetone to be mixed, then a carrier resin material is added, heating reaction, cooling, washing and drying are conducted, and a series of foam materials which are of an interpenetrating structure, uniform in MOF distribution, multiple in defect and good in durability are prepared. The foam materials can be used for efficiently filtering micro-plastics under the condition of water or seawater, have great water stability and seawater stability, can be suitable for micro-plastic filtration with different concentrations and various types, and show great universality. What is worth noting is that preparation and application development of the materials provide great help for development of a novel micro-plasticity filtering technology, and the materials have wide application prospects in solving the problem of marine plastic pollution in the future.

Description

technical field [0001] The invention relates to a metal organic framework (MOFs) foam material, a preparation method thereof and an application in microplastic filtration, belonging to the technical field of metal organic framework foam materials. Background technique [0002] With the development of industry and the sharp increase of world population, human life and industrial production activities have brought a lot of waste plastics. The pollution problem caused by waste plastics has become a huge environmental crisis faced by human society. In 2018, the total global cumulative plastic consumption was as high as about 8 billion tons, of which only a small amount (about 9%) was recycled. However, due to its strong chemical resistance, most waste plastics stay in the environment and can stay for a long time without being degraded. Some of these waste plastics remaining in the environment will flow into the ocean and be decomposed into microplastics through the mechanical ...

Claims

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Application Information

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IPC IPC(8): C08G83/00B01D39/16
CPCC08G83/008B01D39/1676
Inventor 兰亚乾陈勇军陈宜法王艺蓉苗畅
Owner NANJING NORMAL UNIVERSITY
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