Ion Polarization Filtration Technology Based On PDA-modified Fibers

Particulate matter(PM)in the environment is extremely harmful to human health,and according to research,more than 6.44 million people will die from PM pollution in 2019 alone,so effective removal of indoor PM is essential to safeguard health.Fiber filtration is one of the most widely used PM filtration technologies today,however,conventional filters often have difficulty in achieving efficient filtration and generate high resistance in high air velocity environments.To solve this problem,this study successfully achieved high efficiency drag reduction filtration by loading polydopamine(PDA)modified coarse efficiency fiber combined with ionization polarization filtration technology.The main results are as follows:(1)Firstly,several parameters affecting the loading efficiency of PDA were analyzed and optimized,including the rotational angular momentum of magnetic stirrer,reaction temperature,dopamine concentration,solution p H and reaction time,which greatly improved the loading efficiency.(2)For nine common coarse efficiency filtration materials loaded with PDA and the performance was compared and analyzed,and the #6 coarse efficiency fiber,loaded with PDA and combined with ionization polarization filtration,was preferably selected to achieve high efficiency drag reduction filtration with the highest resistance factor.(3)The effects of experimental conditions such as voltage,wind speed,PM type,size and concentration and long-term operation on the filtration performance were investigated from the preferred #6 coarse efficiency fiber.It was found that the particle charge and filter polarization significantly contributed to the improvement of the filtration efficiency of the coarse efficiency fiber;the PDA@#6 coarse efficiency fiber could maintain high filtration efficiency under high wind speed conditions;the influence of PM type,size and concentration on the filtration efficiency was small;the long-term use stability was achieved,and the filtration efficiency was stable and the resistance changed little during the long-term operation of 100 h.This study successfully overcomes the problem of low efficiency or high resistance of traditional filtration technology in high air velocity systems by optimizing PDA loading parameters and coarse efficiency filtration fiber substrate,and combining ionization polarization filtration technology,which provides a useful reference for creating an efficient and energy-saving indoor environment.