Hydrophilic Mesoporous Silica Modified Reveserse Osmosis Membrane And Its Antifouling Effectiveness

In recent years,water shortage,water pollution,water treatment problems and other issues have become the world's most urgent problems,which seriously have affected quality and quantity of human-being's water.Because of its high range of application,high water quality,high degree of automation and other advantages,reverse osmosis membrane are widely used in the field of water treatment,mainly for drinking water treatment and provide water security to increase protection.However,due to the membrane permeability of reverse osmosis membrane and fenestra are small the running pressure is high,easy to be plugged and other problems,the running cost of reverse osmosis membrane is greatly increased,and the service life is greatly reduced,which seriously restricts the extensive use of reverse osmosis technology in drinking water purification application and the possibility of industrial production.Therefore,the preparation of high permeability,high retaining rate,high hydrophilicity,high anti-pollution performance of reverse osmosis membrane are important subjects in the development of reverse osmosis membrane.This report will apply the preparation and production of reverse osmosis membrane with high performance as main goal,through the modification of the amidating process of PSF base film in order to obtain high reverse osmosis membrane performance,to strengthen the reverse osmosis process in the field of water purification engineering applications.In this paper,polysulfone(PSF)film was used as the base material,and the reverse osmosis membrane was prepared by the interfacial polymerization of the active monomer trimesteryl chloride(TMC)and m-phenylenediamine(MPD)on the surface of the basement membrane.Firstly,the effects of different prepared reverse osmosis membranes interface polymerization conditions on the properties were studied.Two different concentrations of reactive monomeric trimesteride(TMC)and m-phenylenediamine(MPD)were used to interfacial polymerization.The reverse osmosis membrane was modified by adding mesoporous molecular sieves SBA-15 to the interface polymerization process by selecting the appropriate reaction concentration for the determination of its permeability and separation properties.The membrane structure and properties were characterized by various evaluation methods.Through the water treatment efficiency test,it was found that the preparation of the reverse osmosis membrane by W/W ratio,which could make the surface polymerization layer of the membrane more dense,and obtain the high-flux and high retention rate pure interface polymerization film M0,and the post-treatment step could make the polymerization layer cross-linking degree higher,which is very important for the stability of reverse osmosis membrane performance.On the base,the introduction of mesoporous silicon material on the activemonomer TMC should be modified to improve the interface polymerization process and the characteristics of the active layer.As the SBA-15's own pore structure makes the flux of the composite membrane to a better extent,the silicon-based material also has a great effect on reducing the membrane surface contact angle and improving the membrane hydrophilicity.After adding SBA-15,the original dense,mesh-structured polyamide layer can be made more loose,"fungus-like" small active layer,increasing the thickness of the active layer and the surface area of the film,making the composite film broken flux and rejection rate,while the enhanced interception rate was enhanced and the best reverse osmosis membrane was selected from the composite membrane with different concentration gradient.The treatment efficiency of the treated water was investigated in the process.In the end,the effect of modified compound reverse osmosis membrane after the simple activated carbon pre-treatment of MBR secondary effluent on the actual water treatment was investigated.The results showed that the pre-treatment could effectively remove the fulvic acid and humus Material and the removal rate of salt is very low;the removal rate of UV254 was 99.9%,the removal rate of salt was more than 95%,and the p H value of raw water could be effectively improved by reverse osmosis membrane.The removal rate of protein and carbohydrate was also well removed by reverse osmosis membrane.And the flux test in the actual water showed that the water flux loss of the modified composite membrane was very small at the time of pollution,and the flux recovery rate was 95.06% after the water rinse,which indicated that the anti-pollution performance of the composite membrane was highly functioning,and the water treatment performance has been significantly improved.