Beijing Key Laboratory of Lignocellulosic Chemistry, and MOE Engineering Research Center of Forestry Biomass Materials and Bioenergy , Beijing Forestry University , Beijing 100083 , P. R. China.
Lab General Biochemistry & Physical Pharmacy, Department of Pharmaceutics , Ghent University , Ghent 9000 , Belgium.
ACS Appl Mater Interfaces. 2019 Apr 3;11(13):12880-12889. doi: 10.1021/acsami.9b01508. Epub 2019 Mar 22.
Ambient particulate matter pollution has posed serious threats to global environment and public health. However, highly efficient filtration of submicron particles, the so-named "secondary pollution" caused by, e.g., bacterial growth in filters and the use of nondegradable filter materials, remains a serious challenge. In this study, poly(vinyl alcohol) (PVA) and konjac glucomannan (KGM)-based nanofiber membranes, loaded with ZnO nanoparticles, were prepared through green electrospinning and ecofriendly thermal cross-linking. Thus obtained fibrous membranes not only show highly efficient air-filtration performance but also show superior photocatalytic activity and antibacterial activity. The filtration efficiency of the ZnO@PVA/KGM membranes for ultrafine particles (300 nm) was higher than 99.99%, being superior to that of commercial HEPA filters. By virtue of the high photocatalytic activity, methyl orange was efficiently decolorized with a removal efficiency of more than 98% at an initial concentration of 20 mg L under 120 min of solar irradiation. A multifunctional membrane with high removal efficiency, low flow resistance, superior photocatalytic activity, and superior antibacterial activity was successfully achieved. It is conceivable that the combination of a biodegradable polymer and an active metal particle would form an unprecedented photocatalytic system, which will be quite promising for environmental remediation such as air filtration and water treatment.
环境颗粒物污染对全球环境和公众健康构成了严重威胁。然而，高效过滤亚微米颗粒，例如细菌在过滤器中生长和不可降解的过滤材料的使用引起的所谓的“二次污染”，仍然是一个严重的挑战。在这项研究中，通过绿色静电纺丝和环保热交联制备了负载 ZnO 纳米粒子的基于聚乙烯醇（PVA）和魔芋葡甘聚糖（KGM）的纳米纤维膜。所得到的纤维膜不仅表现出高效的空气过滤性能，而且表现出优异的光催化活性和抗菌活性。ZnO@PVA/KGM 膜对超细颗粒（300nm）的过滤效率高于 99.99%，优于商业 HEPA 过滤器。由于高的光催化活性，在 120min 的太阳照射下，初始浓度为 20mg/L 的甲基橙的去除效率超过 98%。成功实现了具有高去除效率、低流动阻力、优异的光催化活性和优异的抗菌活性的多功能膜。可以想象，可生物降解聚合物和活性金属颗粒的结合将形成一个前所未有的光催化系统，这对于空气过滤和水处理等环境修复将是非常有前景的。
