Preparation method of modified PVDF ultrafiltration membrane for complexed heavy metal wastewater treatment
A technology for wastewater treatment and ultrafiltration membrane, applied in the field of membrane materials, can solve the problems of reduced membrane water flux, poor membrane hydrophilicity, and low surface energy, and achieve stable and lasting effects, good hydrophilicity, and large specific surface area. Effect
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[0026] Example 1
[0027] A preparation method of modified PVDF ultrafiltration membrane for complexed heavy metal wastewater treatment, including the following steps:
[0028] 1. Surface grafted PS polymer brush: PVDF ultrafiltration membrane is placed in KOH concentration 2.5mol / L, tetrabutylammonium bromide 3g / L alkaline solution, reaction temperature is 55℃, reaction time is 8min, and carbon is obtained on the base membrane surface Carbon double bond, the treated PVDF ultrafiltration membrane is soaked in a PS monomer solution with a concentration of 1mol / L for 1h, and the excess solution is taken out and washed away, and put into the reaction system containing the crosslinking agent MBAA and initiator to react at a constant temperature for 20 minutes. The mass ratio of PS monomer and crosslinking agent is 10:0.3, and the PVDF ultrafiltration membrane grafted with PS polymer brush on the surface is obtained;
[0029] 2. PPy coating: Weigh FeCl 3 ·6H 2 O is dissolved in ultrapure...
Example Embodiment
[0032] Example 2
[0033] A preparation method of modified PVDF ultrafiltration membrane for complexed heavy metal wastewater treatment, including the following steps:
[0034] 1. Surface grafted PS polymer brush: PVDF ultrafiltration membrane is placed in KOH concentration 2.5mol / L, tetrabutylammonium bromide 3.5g / L alkaline solution, reaction temperature 60℃, reaction time 10min, and the base membrane surface is obtained Carbon-carbon double bond, the treated PVDF ultrafiltration membrane is soaked in a PS monomer solution with a concentration of 1.5 mol / L for 1 hour, and the excess solution is taken out and washed away, and put into the reaction system containing the cross-linking agent MBAA and the initiator to react at a constant temperature 30min, the mass ratio of PS monomer and crosslinking agent is 10:0.5, and the PVDF ultrafiltration membrane grafted with PS polymer brush on the surface is obtained;
[0035] 2. PPy coating: Weigh FeCl 3 ·6H 2 O is dissolved in ultrapure wa...
Example Embodiment
[0038] Example 3
[0039] A preparation method of modified PVDF ultrafiltration membrane for complexed heavy metal wastewater treatment, including the following steps:
[0040] 1. Surface grafted PS polymer brush: PVDF ultrafiltration membrane is placed in KOH concentration 2.5mol / L, tetrabutylammonium bromide 4g / L alkaline solution, reaction temperature 65℃, reaction time 8min, carbon is obtained on the surface of the base membrane Carbon double bond, the treated PVDF ultrafiltration membrane is soaked in a PS monomer solution with a concentration of 2mol / L for 1 hour, and the excess solution is taken out and washed away, and placed in the reaction system containing the crosslinking agent MBAA and initiator to react at a constant temperature for 35 minutes. The mass ratio of PS monomer and crosslinking agent is 10:0.7, and the PVDF ultrafiltration membrane grafted with PS polymer brush on the surface is obtained;
[0041] 2. PPy coating: Weigh FeCl 3 ·6H 2 O is dissolved in ultrapu...
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