Research Of The Preparation And Application Of Hybrid Ultrafiltration Membrane Based On Visible Light Response Type Catalyst

Ultrafiltration, as a kind of deep water treatment technology, is more and more applied in water treatment. Ultrafiltration has many advantages, such as simple device, covering an area of an area small and widing applicable scope advantages. However, membrane fouling phenomena will reduce the membrane separation performance, and reduce the service life of membrane. In this paper, the visible light response and pollution resistant polysulfone ultrafiltration membrane was successfully preparated,which was doped the visible light photocatalyst.This article selects the polysulfone(PSF) as membrane material, N, N-dimethyl formamide(10-channel DMAc) as organic solvent, polyethylene glycol(PEG) as additive, visible light catalyst(N-Ti O2, Ag3PO4, C3N4) as additive and Tween-80 as surfactant.The influence of the content of PSF, PEG, additive, Tween-80 and stirring temperature on membrane performance was evaluated by the pure water flux and rejection ratio; the membrane pollution resistance was evaluated by the flux attenuation curves, the membrane resistance coefficient and the contact angle; the structure of the surface and cross section of the film was characterized by scanning electron microscopy(SEM). Main conclusions are as follows:(1) The optimal preparation conditions of Ti O2 polysulfone ultrafiltration membrane were 17.0 wt% PSF, 15.0 wt% PEG 400, 2.0 wt% Ti O2, 1.0 wt% Tween-80, and the stirring temperature was 70?. Under this technological conditions, the water flux, retention rate, membrane resistance coefficient, and contact angle of Ti O2 polysulfone ultrafiltration were 764.9 L/m2·h, 93.8 %, 1.53, 75.7 degrees, respectively. The experimental results showed that the Ti O2 polysulfone ultrafiltration has a certain anti fouling performance.(2) The optimal preparation conditions of Ag3PO4 polysulfone ultrafiltration membrane were 17.0 wt% PSF, 15.0 wt% PEG 400, 0.5 wt% Ag3PO4, 1.0 wt% Tween-80, and stirring temperature was 75?. Under this technological conditions, the water flux, the retention rate, membrane resistance coefficient, and contact angle of Ag3PO4 polysulfone ultrafiltration were 761.9 L/m2 h, 93.1 %, 1.64, 69.8 degrees, respectively. The experimental results showed that the Ag3PO4 polysulfone ultrafiltration has a certain anti fouling performance(3) The optimal preparation conditions of C3N4 polysulfone ultrafiltration membrane were 15.0 wt% PSF, 15.0 wt% PEG 400, 0.4 wt% C3N4, 1.0 wt% Tween-80, and stirring temperature was 70 ?. Under this technological conditions, the water flux, retention rate, membrane resistance coefficient, and contact angle of C3N4 polysulfone ultrafiltration were 542.6 L/m2 h, 98.1 %, 1.69, 72.3 degrees, respectively. The experimental results showed that the C3N4 polysulfone ultrafiltration has a certain anti fouling performance.(4) The performance of three kinds of hybrid ultrafiltration membranes with different visible light is different: from pure water flux analysis, PSF-PEG-N-Ti O2 ? PSF-PEG-Ag3PO4 > PSF-PEG-C3N4; from interception rate analysis, PSF-PEG-C3N4 > PSF-PEG-N-Ti O2 > PSF-PEG-Ag3PO4; from anti-fouling performance analysis, PSF-PEG-N-Ti O2 > PSF-PEG-Ag3PO4 > PSF-PEG- C3N4.(5) In this article, we applicated three kinds of visible light response UF membrane in the treatment of micro polluted source water. And the experimental results showed that the load in the ultra filtration membrane visible light photocatalyst can decomposition of a small amount of organic pollutants under visible light irradiation, which can prevent membrane pore blockage, alleviate membrane fouling, increase the stability of water and lower the cost of treatment. The experimental results showed that the effect of PSF-PEG-Ag3PO4 film is the best, and the effect of PSF-PEG-N-Ti O2 film is the second.