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

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 ...

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

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