Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 51, Issue 17, Pages 10041-10049Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.7b01494
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Funding
- Singapore National Research Foundation under Energy Innovation Research Programme for Building Energy Efficiency (EIRP-BEE) [R-279-000-453-279, R-302-000-142-279]
- Singapore National Research Foundation under Building & Construction Authority [R-279-000-453-279, R-302-000-142-279]
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Severe air pollution has become a global concern, and there is a pressing need to develop effective and efficient air filters for removing airborne particulate matters (PMs). In this work, a highly permeable poly(ether sulfone) (PES) based hollow fiber membrane was developed via a one-step dry-jet wet spinning. For the first time, a hollow fiber membrane was used in removing the ultrafine particles (PMs with aerodynamic equivalent diameters of less than 100 nm) in PM2.5. The novel air filter was designed to possess the synergistic advantages of porous filters and fibrous filters with a sievelike outer surface and a fibrouslike porous substrate. A filtration efficiency of higher than 99.995% could be easily achieved when the self-support hollow fiber was challenged with less than 300 nm particulates. Without losses of the structural advantages, we have demonstrated that the permeation properties of the hollow fiber membrane can be facilely tailored via manipulation of the dope and bore fluid formulations. Various cleaning strategies were explored to regenerate the membrane performance after fouling. Both water rinse and backwash showed effectiveness to restore the membrane permeance for repetitive usage.
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