Alginate-base organic-inorganic composite hydrogel filtering membrane and preparation method thereof
An alginate-inorganic composite technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem of low mechanical strength of pure ion cross-linked hydrogel filtration membrane, easy pollution of membrane surface, flux low level problem
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[0020] Example 1. A calcium alginate / silica organic-inorganic composite hydrogel filtration membrane and its preparation method
[0021] a) Weigh 5g of sodium alginate and polyacrylamide porogen with 100% sodium alginate mass percentage, pour them into 100ml deionized water together, then add 100% sodium alginate mass percentage of nano silica, stir and dissolve evenly Place it in a closed container at 25°C and leave it to defoam to obtain a casting solution;
[0022] b) Prepare a calcium chloride aqueous solution with a calcium ion mass percentage of 5% as an ionic crosslinking agent;
[0023] c) Pour the casting liquid onto a dry and clean glass sheet, scrape out a uniform film with a thickness of 500 μm with a film wiper, and soak the glass sheet together with the glass sheet into the calcium chloride aqueous solution obtained in step b), and react for 12 hours to obtain ions Cross-linked hydrogel flat membrane;
[0024] d) The ion-crosslinked hydrogel flat membrane obtained in st...
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[0025] Example 2. An aluminum alginate / montmorillonite organic-inorganic composite hydrogel filtration membrane and its preparation method
[0026] a) Weigh 1g of sodium alginate and 50% of polyvinylpyrrolidone porogen, and pour them into 100ml of deionized water together, then add 80% of sodium alginate to nano-montmorillonite, stir to dissolve Place it evenly in a closed container at 25°C and leave it to defoam to obtain a casting solution;
[0027] b) Prepare an aluminum chloride aqueous solution with an aluminum ion mass percentage of 8% as an ionic crosslinking agent;
[0028] c) Pour the casting solution onto a dry and clean glass sheet, scrape out a uniform film with a thickness of 2000 μm with a film wiper, and soak the glass sheet into the ionic crosslinker solution obtained in step b), and react for 15 hours to obtain Ion cross-linked hydrogel flat membrane;
[0029] d) The ion-crosslinked hydrogel flat membrane obtained in step c) was shaken and eluted with deionized water...
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[0030] Example 3. A kind of iron alginate / zirconia organic-inorganic composite hydrogel filtration membrane and its preparation method
[0031] a) Weigh 5g of sodium alginate and 10% of polyvinyl alcohol porogen, and pour them into 100ml of deionized water together, then add 60% of sodium alginate to nano-zirconia, stir to dissolve and place it evenly After defoaming in a closed container at 25°C, a casting solution is obtained;
[0032] b) Prepare an aqueous ferric chloride solution with a mass percentage of iron ions of 4% as an ionic crosslinking agent;
[0033] c) Pour the casting liquid onto a dry and clean glass sheet, scrape out a uniform film with a thickness of 20 μm with a film wiper, and soak the glass sheet together with the glass sheet into the ion crosslinker solution obtained in step b), and react for 15 hours to obtain Ion cross-linked hydrogel flat membrane;
[0034] d) The ion-crosslinked hydrogel flat membrane obtained in step c) was shaken and eluted with deionize...
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