Preparation of filled penetrating and distilling composite membranes for removing benzene in water
A pervaporation and filling technology, which is applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problem of component permeation flux decline, and achieve the effect of simple and easy preparation method and good separation effect
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Embodiment 1
[0012] Weigh 10.0g of toluene in a beaker, then add 10.0g of PDMS prepolymer, 1.0g of tetraethyl orthosilicate, 0.2g of dibutyltin dilaurate in turn, mix well, prepare a casting solution, and continue to stir for 15 minutes , pour the casting solution on a horizontally placed plexiglass plate, scrape the casting solution into a film with a scraper, dry it at room temperature for 24 hours, peel off the film from the glass plate, and dry it under vacuum for 24 hours to obtain PDMS reference membrane. Marked as 1#.
[0013] Through scanning electron microscope analysis, polarizing microscope analysis, infrared analysis, differential scanning calorimetry and X-ray diffraction analysis, the film has good compactness, low glass transition temperature, low crystallinity, and the film thickness is about 200 microns. Used to remove benzene in benzene aqueous solution with a mass concentration of 0.14%, the separation factor can reach 3275, and the benzene flux can reach 129g m -2 h ...
Embodiment 2
[0015] First, the calix[4]arene crystals are ground, passed through a 300-mesh standard sieve, and the average particle size is determined to be 25 microns. Weigh 10.0g of toluene, add 0.1g of calix[4]arene, mix well, then add 10.0g of PDMS prepolymer, 1.0g of tetraethyl orthosilicate, 0.2g of dibutyltin dilaurate, mix well, and prepare Form a casting solution and continue to stir for 15 minutes. Pour the film-casting liquid onto a horizontal plexiglass plate, scrape the film-casting liquid with a scraper to form a film, dry it at room temperature for 24 hours, peel off the film from the glass plate, and dry it under vacuum for 24 hours to obtain the filled film. pervaporation membrane. Marked as 2#.
[0016] After scanning electron microscope analysis, polarizing microscope analysis, infrared analysis, differential scanning calorimetry and X-ray diffraction analysis, the film has good compactness, uniform filler distribution, low glass transition temperature, but high cryst...
Embodiment 3
[0018] First, the calix[4]arene crystals are ground, passed through a 300-mesh standard sieve, and the average particle size is determined to be 25 microns. Weigh 10.0g toluene, add 0.3g calix[4]arene, mix well, then add 10.0g PDMS prepolymer, 1.0g tetraethyl orthosilicate, 0.2g dibutyltin dilaurate, mix well, and prepare Form a casting solution and continue to stir for 15 minutes. Pour the film-casting liquid onto a horizontal plexiglass plate, scrape the film-casting liquid with a scraper to form a film, dry it at room temperature for 24 hours, peel off the film from the glass plate, and dry it under vacuum for 24 hours to obtain the filled film. pervaporation membrane. Marked as 3#.
[0019] After scanning electron microscope analysis, polarizing microscope analysis, infrared analysis, differential scanning calorimetry and X-ray diffraction analysis, the film has good compactness, uniform filler distribution, low glass transition temperature, low crystallinity, and a film...
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