Choi Yong Ho, Kim Moon-Ju, Lee Jia, Pyun Jae-Chul, Khang Dahl-Young
Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea.
Nanomaterials (Basel). 2021 Dec 13;11(12):3381. doi: 10.3390/nano11123381.
Reusable, antibacterial, and photocatalytic isoporous through-hole air filtration membranes have been demonstrated based on hydrothermally grown ZnO nanorods (NRs). High-temperature (300375 °C) stability of thermoset-based isoporous through-hole membranes has enabled concurrent control of porosity and seed formation via high-temperature annealing of the membranes. The following hydrothermal growth has led to densely populated ZnO NRs on both the membrane surface and pore sidewall. Thanks to the nanofibrous shape of the grown ZnO NRs on the pore sidewall, the membrane filters have shown a high (>97%) filtration efficiency for PM with a rather low-pressure (80 Pa) drop. The membrane filters could easily be cleaned and reused many times by simple spray cleaning with a water/ethanol mixture solution. Further, the grown ZnO NRs have also endowed excellent bactericidal performance for both Gram-positive and Gram-negative bacteria. Owing to the wide bandgap semiconductor nature of ZnO NRs, organic decomposition by photocatalytic activity under UV illumination has been successfully demonstrated. The reusable, multifunctional membrane filters can find wide applications in air filtration and purification.
基于水热生长的氧化锌纳米棒（NRs），已制备出可重复使用、具有抗菌和光催化性能的等孔通孔空气过滤膜。基于热固性材料的等孔通孔膜在高温（300~375°C）下具有稳定性，通过对膜进行高温退火，能够同时控制孔隙率和晶种形成。随后的水热生长过程使得膜表面和孔侧壁上都生长出密集的氧化锌纳米棒。由于孔侧壁上生长的氧化锌纳米棒呈纳米纤维状，该膜过滤器对颗粒物的过滤效率很高（>97%），且压降相当低（约80 Pa）。通过用水/乙醇混合溶液进行简单喷雾清洗，膜过滤器能够轻松地被清洗并多次重复使用。此外，生长的氧化锌纳米棒对革兰氏阳性菌和革兰氏阴性菌均具有优异的杀菌性能。由于氧化锌纳米棒具有宽带隙半导体性质，已成功证明其在紫外光照射下具有光催化活性，能够分解有机物。这种可重复使用的多功能膜过滤器在空气过滤和净化领域具有广泛的应用前景。
