Method for in-situ growth of nanoscale metal organic framework ZIF-8 on surfaces of polypropylene melt-blown cloth fibers

Abstract

The invention belongs to the field of fiber composite membrane preparation methods, and discloses a preparation method for in-situ growth of nanoscale (less than 100 nm) ZIF-8 crystals on the surfaces of inert polypropylene melt-blown cloth fibers. The preparation method comprises the following steps of firstly, modifying polypropylene fibers with polyacrylamide to enable the polypropylene fibers to have active groups, then adjusting the proportion of metals and organic ligands of ZIF-8 so as to control the size of the crystals, and uniformly growing the nanoscale ZIF-8 crystals on the surfaces of the polypropylene fibers through an in-situ growth method. As the nanoscale ZIF-8 crystals have larger specific surface area, higher porosity and abundant active functional groups, gas circulation and particulate matter capture can be facilitated. The ultra-small ZIF-8 particles are firmly combined on the surfaces of the fibers, and original holes among the fibers cannot be blocked; while the filtration efficiency is relatively high, the increase of filtration resistance can be greatly inhibited, and the Trade-off effect of a fiber filtration membrane is effectively reduced; and the method is mild in reaction condition, simple in preparation process and suitable for amplification synthesis and actual production application.

Description

technical field

[0001] The invention belongs to the field of fiber composite membrane preparation, and in particular relates to a preparation method for the stable combination of a metal organic framework and an inert fiber. Background technique

[0002] At present, due to the improvement of living standards and the rapid deterioration of environmental quality, people's attention to air quality has risen rapidly, and the content of PM2.5 in the air has become an important criterion for judging air quality. So removing particulate matter from the air is very important to our health. So far, air filters have been developed rapidly. However, further improvements are needed in terms of high removal efficiency, low pressure drop, and stability.

[0003] Porous materials that can be used in air filters have been rapidly developed, especially metal-organic frameworks (MOFs), which are produced through coordinate bonds between metals (or metal clusters) and organic species with th...

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