@article{Xu2025, 
author = {Junchao Xu and Qingdong Yao and Wuwang Han and Yiming Xie and Li Lv and Huaqiang Chu and Fuping Qian},
title = {Ultralow pressure drop and high efficiency filtration by electrostatically assisted filtration with micro-biochar@PU coarse fibers},
year = {2025},
journal = {Building Simulation},
volume = {18},
number = {9},
pages = {2405-2416},
keywords = {air filtration, particulate matter, electrostatic assistance, biochar, high efficiency, low resistance},
url = {https://www.sciopen.com/article/10.1007/s12273-025-1330-y},
doi = {10.1007/s12273-025-1330-y},
abstract = {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 0.3–0.5 μm 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.}
}