| In the condition of rapid development of human living standard,the air pollution brought by production and life is intensifying,especially in the global outbreak of the new crown epidemic today,it is crucial to develop a multifunctional air filtration material to purify the air.In this paper,we combine a three-dimensional mesh structure of high-efficiency glass microfiber filter membrane(H13)with food-grade zinc oxide,and use semiconductor photocatalysis technology and graphene-based materials to synthesize an antibacterial air filter membrane with visible light response.The main contents of this paper are as follows:1.rGO/ZnO/H13 composite air filter membranes were successfully prepared by in situ growth of ZnO and r GO on glass microfiber air filter membranes using sol-gel pyrolysis.The optimum composite ratio of ZnO to r GO was determined by photocatalytic degradation activity test.The developed air filter membrane was comprehensively analyzed by scanning electron microscopy(SEM),energy spectrum analysis(EDS),X-ray diffraction analysis(XPS)and Raman spectroscopy(Raman),and it was found that the nano-ZnO was densely coated and uniformly loaded on the H13 glass filter with an average particle diameter of 50-100 nm.The degradation rate of 10 mg/L rhodamine B(Rh B)solution reached 95% in 2 h under 500 W Xe lamp irradiation.At the same time,the antibacterial inactivation effect of Escherichia coli(E.coli)and Staphylococcus aureus(S.aureus)can reach 99.9% within 4 h under the radiation of 60 W LED lamp.The air filter membrane has higher separation efficiency of photogenerated electron hole pair due to its three-dimensional network structure,thus enhancing the photocatalytic activity and antibacterial performance.2.Graphene/ZnO/H13 composite air filtration membranes were successfully prep ared by microwave synthesis method.The relationship between the morphology of zin c oxide(flower and rod)and its photodegradation and antibacterial activity was invest igated using graphene,which is now available for mass production,instead of expensi ve r GO.The rod-like ZnO composite air filter has the best performance.Under 500 W xenon lamp,the degradation of 10 mg/L Rh B solution can reach 100%.Under 60 W L ED irradiation,the 100% inactivation rate of Escherichia coli(E.coli)and Staphyloco ccus aureus(S.aureus)was increased to 2 h.Filtration efficiency was also maintained at the same level(99.8%)as without the addition of photocatalytic particles.In additio n,the rapid antibacterial principle of the multifunctional composite air filter membran e and the main active species in the photodegradation process were investigated by U V-Vis diffuse reflectance spectroscopy(UV-Vis),photoluminescence(PL)and electro n spin resonance(ESR)spectroscopy.3.In view of the influence of glass microfiber composition on the strength of filter membranes,an empirical formula for evaluating the relationship between composition,viscosity and viscous modulus of ultrafine glass microfibers was proposed by testing the viscosity of 16 different compositions of glass microfibers at 1300 °C and 1400 °C to provide a reference for evaluating the production technology of glass microfiber filter membranes. |
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