Construction Of Multi-stage Fiber Air Filter Material Based On Organic Small Molecule Gel Self-assembly Technology

In recent years,air pollution has severely restricted economic and social development,affecting human health and safety.In this paper,based on the development needs of air filter materials,we conducted research around the idea of constructing high-efficiency,low-resistance hierarchical nanofiber air filter materials.Different types of hierarchical nanofiber air filters were made by self-assembling gelators in solution blowing nanofiber mats and polypropylene melt-blown nonwoven fabrics into supramolecular nanowires.The details are as follows:In order to solve the problems of poor filtration performance,a hierarchical nanofiber air was prepared by making DMDBS small molecular gels self-assemble into nanofibrils in solution blowing mats.The results showed that DMDBS successfully self-assembled in the solution blowing nanofiber mats to form a multilayer nanofibrils network.By analyzing the formation mechanism and influencing factors,effective control of the morphology was achieved.The prepared hierarchical nanofiber/nanomat air filter material showed stable mechanical properties and excellent particle interception abilities.For DEHS aerosol particles with particle size above 0.2μm,the interception efficiency can reach 100% with a extremely low air resistance of 32Pa and a high quality factor of 0.189Pa^-1.Aiming at the problem that the air filtration performance of the polypropylene melt-blown nonwoven fabric is easily affected by environmental factors,L-phenylalanine was used to self-assembled in hydrophilic-modified polypropylene melt-blown nonwoven to construct melt-blown based hierarchical nanofiber air filter.The results showed that L-phenylalanine successfully self-assembled into nanofibril networks within the hydrophilic polypropylene melt-blown nonwoven fabric.By analyzing the formation mechanism and influencing factors,effective control of the morphology of self-assembled nanofibril networks was achieved.Compared with ordinary polypropylene melt-blown nonwoven fabrics,the mechanical strength and filtration performance have been significantly improved.For PM_2.5 particles,the melt-blown hierarchical nanofiber air filter material showed higher filtration efficiency 98.823% and low air resistance of 32Pa.