Preparation method of graphene-cyclodextrin composite nanofiltration membrane with high pollution resistance
A composite nanofiltration membrane, graphene technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation and other directions, can solve problems such as performance and service life decline, achieve low cost, good anti-fouling performance, water flow The effect of high volume recovery rate
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[0017] The preparation method of graphene-cyclodextrin composite nanofiltration membrane specifically comprises the following steps:
[0018] (1) After dispersing partially reduced graphene oxide in deionized water and ultrasonically dispersing, cyclodextrin was added to obtain a mixed dispersion. The concentration of the partially reduced graphene oxide was 0.15-1.5 mg / L, and the concentration of cyclodextrin The concentration is 0.05-4.5mg / L; the loading of cyclodextrin needs to be controlled: if the loading of cyclodextrin is too small, the antifouling performance of the obtained nanofiltration membrane will not be improved significantly; if the loading of cyclodextrin is too large, the excessive cyclodextrin On the contrary, dextrin will provide a large number of sites for pollutant adsorption, and will increase the surface roughness of the membrane, which is not conducive to the antifouling performance of the membrane.
[0019] (2) Then pour the mixed dispersion prepared ...
Embodiment 1
[0031] 1. Preparation of partially reduced graphene oxide:
[0032] 1.1 Use hummer to prepare graphene oxide solution. For the preparation method, refer to Z. Xu, Y. Zhang, P. Li, C. Gao, ACS Nano 2012, 6, 7103.
[0033] 1.2 Measure the concentration of the graphene oxide solution prepared in step 1.1 to be 5.6g / L.
[0034] 1.3 Add water to the graphene oxide solution prepared in step 1.1, and dilute it into a graphene oxide solution with a concentration of 0.5g / L;
[0035] 1.4 Heat the graphene oxide solution prepared in step 1.3 to reflux at 90° C. for 3 hours to obtain a partially reduced graphene oxide solution with a solubility of 0.5 g / L.
[0036] 2. Evenly disperse 0.6 mL of the partially reduced graphene oxide solution in 300 mL of deionized water, add 0.6 mg β-cyclodextrin to obtain a mixed dispersion, the concentration of the partially reduced graphene oxide is 1 mg / L, and the cyclodextrin The concentration of dextrin is 2mg / L;
[0037] 3. Then pour 300 mL of the ...
Embodiment 2
[0041] 1. Preparation of partially reduced graphene oxide:
[0042] 1.1 Prepare graphene oxide solution with hummer.
[0043] 1.2 Measure the concentration of the graphene oxide solution prepared in step 1.1 to be 7.5g / L.
[0044] 1.3 Add water to the graphene oxide solution prepared in step 1.1, and dilute it into a graphene oxide solution with a concentration of 0.5g / L;
[0045]1.4 Heat the graphene oxide solution prepared in step 1.3 to reflux at 120° C. for 1 hour to obtain a partially reduced graphene oxide solution with a solubility of 0.5 g / L.
[0046] 2. ultrasonically disperse 90 μL of the partially reduced graphene oxide solution prepared in step 1 in 300 mL of deionized water, add 450 μg α-cyclodextrin, 450 μg β-cyclodextrin and 450 μg γ-cyclodextrin to obtain a mixed dispersion, the The concentration of partially reduced graphene oxide is 0.15 mg / L, and the concentration of cyclodextrin is 4.5 mg / L;
[0047] 3. Then pour 300 mL of the dispersion into a suction f...
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