Forward osmosis organic-inorganic composite membrane and preparation method thereof
An inorganic composite membrane and forward osmosis technology, applied in the field of membrane separation, can solve the problem that the membrane flux of forward osmosis is not greatly improved.
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[0136] In the step (b) of the method for preparing the forward osmosis organic-inorganic composite membrane of the present invention, the bottom membrane layer is formed by phase inversion of the coated liquid coating of the casting solution in a gel bath. Described phase inversion method specifically comprises the following steps:
[0137] (1) pour the uniformly stirred casting solution on the base material after standing for defoaming, and evenly scrape it on the base material with a scraper of a certain thickness;
[0138] (2) The film coated with the casting solution obtained in step (1) is left in the air until the solvent evaporates to form a dense skin layer;
[0139] (3) Put the formed dense skin film into a gel bath to gel, and obtain the required bottom film layer after phase inversion.
[0140] The gel bath used in the phase inversion method includes deionized water or a mixed solution of deionized water and the solvent used.
[0141] In the step (b) of the method...
Embodiment 1
[0162] Example 1 Preparation of Forward Osmosis Organic-Inorganic Composite Membrane
[0163] Using cellulose acetate as the polymer, 12g cellulose acetate and 0.4g Ag nanoparticles (1.5μm in particle size) were added to 87.6g 1,4-dioxane solvent, stirred and dissolved to form Ag nanoparticles with a content of 0.4wt%. The film-casting solution of the particles is gelled in a gel bath to form a film, and the prepared film is washed with deionized water to remove residual organic solvents to obtain a forward osmosis organic-inorganic composite film, which is stored in deionized water for later use.
[0164] After testing, the flux of the forward osmosis organic-inorganic composite membrane prepared in this example is 20L m -2 h -1 , The rejection rate is above 99%.
[0165] The prepared forward osmosis organic-inorganic composite membrane and the membrane without nanoparticles were subjected to microbial contamination experiments under the same conditions. Escherichia coli m...
Embodiment 2
[0166] Example 2 Preparation of Forward Osmosis Organic-Inorganic Composite Membrane
[0167] Weigh 16g of polysulfone polymer and dissolve it in 84g of a mixed solvent composed of N,N-dimethylacetamide and polyethylene glycol 400 (the ratio of the two is 76:8), and the concentration of the polymer is 18%. polysulfone solution. Add 2g of silver-loaded NaA zeolite molecular sieve nanoparticles (particle size: 1.5 μm) with a hexahedral shape to the prepared polysulfone solution, and disperse in ultrasonic for 30 min to prepare NaA-type zeolite molecular sieve nanoparticles containing 2wt% silver. Particle casting solution, coating the casting solution on the low-density non-woven support layer, using a scraper with a certain thickness to scrape the film, putting it into a gel bath to form a gel film, using m-phenylenediamine and homophenylene Triformyl chloride is subjected to interfacial polymerization on the formed membrane (reacting at 110° C. for 3 minutes), thereby prepari...
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