Polyamide thin-layer composite reverse osmosis membrane and preparation method and application thereof
A technology of reverse osmosis membrane and polyamide, which is used in semi-permeable membrane separation, chemical instruments and methods, osmosis/dialysis water/sewage treatment, etc., to achieve the effects of intensifying interfacial polymerization, strong flexibility, and small pore size
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[0044]
[0045] The preparation method of polyamide thin layer composite reverse osmosis membrane of the present invention comprises the steps:
[0046] (1), Zn(NO 3 ) 2 ·6H 2 O, polyvinylpyrrolidone and pyrazine are dissolved in organic solvent and made into zinc nitrate solution, and middle-tetra(4-carboxyphenyl) porphine is dissolved in organic solvent and made into porphin solution, and porphin solution is stirred (100 -300rpm) into the zinc nitrate solution drop by drop, after mixing the two solutions, sonicate for 15-30min, react at 80-100°C for 12-24h, and synthesize metal-organic framework nanosheets Zn-TCPP;
[0047] (2), the metal organic framework nanosheet Zn-TCPP is centrifuged to obtain a purple precipitate, and vacuum-dried; Soxhlet extraction is performed with deionized water to remove the residual organic solvent in the Zn-TCPP, dried, and dissolved in an organic solvent In the process, the metal organic framework nanosheet solution (Zn-TCPP solution) was...
Embodiment 1
[0065] The preparation method of the polyamide thin-layer composite reverse osmosis membrane of the present embodiment comprises the following steps:
[0066] (1), 45mg Zn(NO 3 ) 2 ·6H 2 O, 200mg of polyvinylpyrrolidone and 8mg of pyrazine are dissolved in 150mL of N,N-dimethylformamide and the mixed solution of ethanol (volume ratio is 3:1) and are made into zinc nitrate solution; Carboxyphenyl) porphine is dissolved in 50mL N,N-dimethylformamide and ethanol mixed solution (volume ratio is 3:1) and is made into porphin solution; The zinc nitrate solution is stirred (150rpm) gradually Add dropwise into the porphin solution, and react at 80° C. for 24 hours after ultrasonication for 15 minutes to obtain metal-organic framework nanosheets Zn-TCPP.
[0067] (2), the metal organic framework nanosheet Zn-TCPP was centrifuged at 8000rpm for 8 minutes to obtain a purple precipitate, which was dried in vacuum for 12 hours; the obtained Zn-TCPP was subjected to Soxhlet extraction wi...
Embodiment 2
[0071] The preparation method of the polyamide thin-layer composite reverse osmosis membrane of the present embodiment comprises the following steps:
[0072] (1), 45mg Zn(NO 3 ) 2 ·6H 2 O, 200mg polyvinylpyrrolidone and 8mg pyrazine are dissolved in 90mL N,N-dimethylformamide and the mixed solution of ethanol (volume ratio is 3:1) and be made into in the zinc nitrate solution; -carboxyphenyl) porphine is dissolved in 30mL N, N-dimethylformamide and ethanol mixed solution (volume ratio is 3:1) and is made into porphine solution; Zinc nitrate solution is stirred (150rpm) Add dropwise into the porphin solution, and react at 80° C. for 24 hours after ultrasonication for 15 minutes to obtain metal-organic framework nanosheets Zn-TCPP.
[0073] (2), the metal organic framework nanosheet Zn-TCPP was centrifuged at 8000rpm for 8 minutes to obtain a purple precipitate, which was dried in vacuum for 12 hours; the obtained Zn-TCPP was subjected to Soxhlet extraction with deionized wa...
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