PM2.5 can easily penetrate indoor spaces through natural or mechanical ventilation systems,posing a serious threat to human health.Fiber filtration is the predominant technique for indoor particulate matter purificati...PM2.5 can easily penetrate indoor spaces through natural or mechanical ventilation systems,posing a serious threat to human health.Fiber filtration is the predominant technique for indoor particulate matter purification.However,there is an inherent trade-off between achieving high filtration efficiency and maintaining low resistance.Therefore,this study employs a simple and fast adhesive method to fabricate a composite material composed of micro-biochar(BC)and polyurethane(PU)coarse fibers(BC@PU).We developed an electrostatic-assisted air filtration device system that leverages the electrostatic interaction between charged particles and polarized fibers to achieve high-efficiency,low-resistance air filtration.At a face air velocity of 0.4 m/s,the BC-1.5@PU material achieves a remarkable 98.83%removal efficiency for particles in the 0.3-0.5µm size range,while maintaining a minimal pressure drop of approximately 7 Pa,with the best CQF(comprehensive quality factor)value of 0.408 Pa^(-1),which was a remarkable 94.06%improvement over the bare PU material.In addition,the simulation results indicate that the micro-biochar significantly enhances the effective electric field range within the composite fibers.It indicates that this composite fiber holds great potential for air purification in ventilation systems.展开更多
基金supported by the National Natural Science Foundation of China(grant No.52406121,No.52176095)Anhui Provincial Natural Science Foundation(grant No.2308085ME189)Anhui Provincial Scientific Research Projects of Universities(grant No.2024AH050142).
文摘PM2.5 can easily penetrate indoor spaces through natural or mechanical ventilation systems,posing a serious threat to human health.Fiber filtration is the predominant technique for indoor particulate matter purification.However,there is an inherent trade-off between achieving high filtration efficiency and maintaining low resistance.Therefore,this study employs a simple and fast adhesive method to fabricate a composite material composed of micro-biochar(BC)and polyurethane(PU)coarse fibers(BC@PU).We developed an electrostatic-assisted air filtration device system that leverages the electrostatic interaction between charged particles and polarized fibers to achieve high-efficiency,low-resistance air filtration.At a face air velocity of 0.4 m/s,the BC-1.5@PU material achieves a remarkable 98.83%removal efficiency for particles in the 0.3-0.5µm size range,while maintaining a minimal pressure drop of approximately 7 Pa,with the best CQF(comprehensive quality factor)value of 0.408 Pa^(-1),which was a remarkable 94.06%improvement over the bare PU material.In addition,the simulation results indicate that the micro-biochar significantly enhances the effective electric field range within the composite fibers.It indicates that this composite fiber holds great potential for air purification in ventilation systems.
