Development Of A New Type Of Photoelectric Catalytic Hybrid Membrane And Its Application In Water Purification

In recent years,the photocatalytic technology developed by combining photocatalytic technology and electrolysis can effectively reduce the recombination of electron-hole pairs,improve the water treatment capacity of photocatalysis,and demonstrate its effectiveness in the treatment of water pollution and the mineralization of organic pollutants.At the same time,membrane technology is widely used in water treatment due to its high efficiency,energy saving,environmental protection and cleanness.Combining photoelectric catalytic technology with membrane technology,a new type of photoelectric catalytic hybrid membrane has been developed.While membrane filtration,photoelectric catalytic degradation of organic macromolecules can improve the treatment effect and efficiency of organic sewage,and is expected to achieve commercial applications.In this paper,PVDF membrane is used as the base material,and the conductive modification and photoelectric catalytic modification are mainly carried out,and they are applied to stationary and mobile water treatment.In a variety of tests,the electrical conductivity,electrochemical performance,photoelectric catalytic performance and water treatment performance of the membrane were explored,and the feasibility and advantages of the combination of photoelectric catalytic technology and membrane technology were explored,and the following research results were obtained:(1)When the proportion of the insulating PVDF film hybrid conductive material ACET reaches the conductivity threshold of 2%,ACET will form a conductive network in the film,and the film will be conductive and have a certain degree of conductivity;The hybrid surfactant SDS can enhance the conductivity and current response of the membrane;the hybrid PVP can increase the membrane flux by about 12%;Finally,hybridization of P25 can make the film have a certain degree of photoelectrocatalysis and show a clear chopping response.However,too much hybrid inorganic or organic materials will cause the mechanical strength of the membrane to drop significantly,so it is important to maintain a balance between different properties.The final ACET-PVDF membrane has an average resistivity of 3.165 Ω·m,and the membrane surface has evenly distributed pore sizes ranging from 20 nm to 150 nm.Its cross-section has obvious pores and a network structure,and the thickness is about 120 um.(2)ACET-PVDF membrane has a good water treatment effect on 0.5 mg/L MB or MO solution in fixed and mobile water treatment.The decolorization effect under the photoelectric catalytic degradation mode in 4 different experiments is the best.Reflects the advantages of photoelectric catalysis synergy;At the same time,thanks to the organic composition and porous structure of the membrane,the adsorption capacity of the membrane is good,which will be stronger in the flow water treatment;With the progress of water treatment,the membrane will adsorb MB or MO,causing the pore size of the membrane to be blocked,which will weaken the degradation ability and reduce the membrane flux,and its stability needs to be improved.The combination of photoelectric catalytic technology and membrane technology has effectively improved the water treatment capacity and efficiency of ACET-PVDF membranes.(3)Using the organic conductive material PANI and PVDF to hybridize,through multiple sets of control experiments and tests,the best hybridization ratio of PANI-PVDF film is found:PVDF 10%,PANI 5%,P25 3%,SDS 2%And NMP 80%.Its average resistivity is 4.74Ω·m,the membrane surface has obvious pore diameters,and the cross-sectional pores are obvious,and the thickness is about 150 um,but there is no obvious chopping response in the IT test.(4)PANI-PVDF membrane has a good water treatment effect on 0.5 mg/L MB or MO solution in fixed and mobile water treatment.In 4 different experiments,the decolorization effect under the photoelectric catalytic degradation mode is the best,Which reflects the photoelectric catalytic performance of the membrane;also thanks to the organic composition and porous structure of the membrane,the membrane has good adsorption capacity,and the adsorption capacity of MO is stronger than that of ACET-PVDF membrane,but the photoelectric catalytic performance is weaker than it;the membrane is in water Organic matter will be adsorbed during the treatment,causing the pore size to be blocked,and the degradation effect and membrane flux will be reduced.The combination of photoelectric catalytic technology and membrane technology also enhances the water treatment capacity and efficiency of the PANI-PVDF membrane.