Development of a Two-Tier Fibrous Membrane by Sequential Electrospinning for Effective Air Filtration

In the current work, a strategy to fabricate two-tier structured poly L-lactide/TiO2 nanoparticles (NPs) incorporated polyvinylpyrrolidone (PLLA/PVP-TiO2 NPs) fibrous membrane for air filtration via sequential electrospinning technique are reported. Anatase TiO2 NPs ranging from 90 to 105nm in size were synthesized by the sol-gel method. The diameter of PLLA and PVP-TiO2 NPs fibers was in the range of 1.15-1.45 and 1.8-2.2 mu m, respectively. This two-tier membrane possessed thermal stability with decomposition temperatures at 364.2 and 447.5 degrees C for PLLA and PVP-TiO2, respectively. Gas molecules such as CO, CO2, O-2, hydrocarbon (HC) and particulate matter (PM) were adsorbed on the surface of TiO2 nanoparticles as confirmed by IR spectroscopy. The gas adsorption results revealed that 89% of CO2, 80% of CO, 64% of O-2, 92% of HC, and 79% of PM were adsorbed after filtration. The pressure drop across the membrane increased from 265 to 341 Pa after filtration. The dust-loading capacity was quantified by weighing the membrane at regular intervals after exposing it to the exhaust. Adsorption of gases followed the pseudo-second order kinetic model and intraparticle diffusion mechanism. This two-tier membrane may be an efficient air filter for domestic and industrial purposes.

在当前的工作中，报告了一种策略，该方法用于制造结合聚乙烯吡咯烷酮（PLLA / PVP-TiO2 NPs）纤维膜的两层结构聚L-丙交酯/ TiO2纳米颗粒（NPs），用于通过顺序电纺丝技术进行空气过滤。通过溶胶-凝胶法合成了90-105nm的锐钛矿型TiO2 NP。 PLLA和PVP-TiO 2 NPs纤维的直径分别在1.15-1.45和1.8-2.2μm的范围内。这种两层膜具有热稳定性，PLLA和PVP-TiO2的分解温度分别为364.2和447.5摄氏度。红外光谱证实，CO，CO2，O-2，碳氢化合物（HC）和颗粒物（PM）等气体分子吸附在TiO2纳米颗粒的表面上。气体吸附结果表明，过滤后吸附了89％的CO 2，80％的CO，64％的O-2、92％的HC和79％的PM。过滤后，跨膜的压降从265 Pa增加到341 Pa。在将薄膜暴露于废气后，定期对薄膜进行称重，从而对粉尘的承载能力进行了量化。气体的吸附遵循伪二级动力学模型和粒子内扩散机制。这种两层膜可以是用于家庭和工业目的的高效空气过滤器。

Published: 2018

Journal ：CLEAN-Soil Air Water

Impact Factor：1.73

Paper link: https://onlinelibrary.wiley.com/doi/abs/10.1002/clen.201800099