Hydrophilic/hydrophobic transition polyelectrolyte/titanium dioxide composite nanofiltration membrane and preparation method thereof
A technology of composite nanofiltration membrane and polyelectrolyte, which is applied in the field of composite nanofiltration membrane, hydrophilic/hydrophobic conversion composite nanofiltration membrane and its preparation, to achieve the effect of easy operation
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Embodiment 1
[0025] (1) Preparation of pre-assembled layers
[0026] First, immerse the pretreated ultrafiltration base membrane with a negative charge on the surface in a cationic polyelectrolyte solution with a concentration of 5.0 g / L, assemble the cationic polyelectrolyte, take it out for 20 minutes, and wash it fully with deionized water; then soak the membrane Assemble the anionic polyelectrolyte in an anionic polyelectrolyte solution with a concentration of 5.0 g / L, take it out for 20 minutes, and wash it fully with deionized water, so that the obtained pair of cationic polyelectrolyte and anionic polyelectrolyte are used as a pre-assembled layer;
[0027] (2) Hydrophilic polyelectrolyte / TiO 2Preparation of Composite Nanofiltration Membrane
[0028] The pre-assembled layer prepared in step (1) was soaked in a concentration of 0.15g / L positively charged titanium dioxide (TiO 2 ) The concentration of nanoparticles is 5.0g / L in the cationic polyelectrolyte, take it out after 20min, f...
Embodiment 2
[0033] (1) Preparation of pre-assembled layers
[0034] First, immerse the pretreated ultrafiltration base membrane with a negative charge on the surface in a cationic polyelectrolyte solution with a concentration of 5.0 g / L, assemble the cationic polyelectrolyte, take it out for 30 minutes, and wash it fully with deionized water; then soak the membrane Assemble the anionic polyelectrolyte in an anionic polyelectrolyte solution with a concentration of 5.0 g / L, take it out for 30 minutes, and wash it fully with deionized water, so that the obtained pair of cationic polyelectrolyte and anionic polyelectrolyte are used as a pre-assembled layer;
[0035] (2) Polyelectrolyte / TiO 2 Preparation of Composite Nanofiltration Membrane
[0036] The pre-assembled layer prepared in step (1) was soaked in a concentration of 0.10g / L positively charged titanium dioxide (TiO 2 ) The concentration of nanoparticles is 5.0g / L in the cationic polyelectrolyte, take it out after 30min, fully wash w...
Embodiment 3
[0043] (1) Preparation of pre-assembled layers
[0044] First, immerse the ultrafiltration base membrane with a negative charge on the surface after pretreatment in a cationic polyelectrolyte solution with a concentration of 5.0 g / L, assemble the cationic polyelectrolyte, take it out for 15 minutes, and wash it fully with deionized water; then soak the membrane Assemble the anionic polyelectrolyte in an anionic polyelectrolyte solution with a concentration of 5.0 g / L, take it out for 15 minutes, and wash it fully with deionized water, so that the obtained pair of cationic polyelectrolyte and anionic polyelectrolyte are used as a pre-assembled layer;
[0045] (2) Hydrophilic polyelectrolyte / TiO 2 Preparation of Composite Nanofiltration Membrane
[0046] The pre-assembled layer prepared in step (1) is soaked in a concentration of 0.05g / L positively charged titanium dioxide (TiO 2 ) The concentration of nanoparticles is 5.0g / L in the cationic polyelectrolyte, take it out after ...
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