Acoustic energy boosts air purification: A novel sound-wave drive TENG for filterless particulate capturing

IF 16.8 1区 材料科学 Q1 CHEMISTRY, PHYSICAL
Yiting Zhang , Siu-Kai Lai , Chen Wang , Kin-Fai Ho , Chun H. Wang
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Abstract

Maintaining good indoor air quality is crucial for human health, as poor air quality in enclosed spaces can elevate the risk of infection and cause premature deaths. This study introduces a novel low-cost, filter-less method for capturing ultrafine particulates to improve air purification efficiency in air ductworks. The new technology employs sound waves to cluster particulates and simultaneously activate triboelectric nanogenerators (TENGs) to operate as electrostatic precipitators, creating a synergistic approach where two techniques complement and enhance each other. The sound waves, created within a U-shaped acoustic resonating chamber using loudspeakers, cluster the particulates and excite the TENG to generate high electrical fields between its electrodes. This high electrical field captures the clustered particulates by electrostatic precipitation. Experimental tests are utilized in this work. The peak electrical output of the electrospun nanofiber-based TENG was recorded at approximately 60 V (peak-to-peak value) in the presence of sound fields. In addition, we fabricated a scaled-down ventilation model to examine the efficiency of particle filtration. Experimental results show that this technique significantly improves the removal efficiency, particularly for ultrafine particulates (0.3–1.0 µm). The maximum removal efficiency for PM2.5 can reach 97.5 %, comparable to that of HEPA filters. The findings of this work demonstrate the effectiveness and controllability of this novel filter-less air purification method.

Abstract Image

声能促进空气净化:用于无过滤器微粒捕获的新型声波驱动 TENG
保持良好的室内空气质量对人类健康至关重要,因为封闭空间的空气质量差会增加感染风险并导致过早死亡。本研究介绍了一种新型的低成本、无过滤器的超细颗粒物捕获方法,以提高空气管道的空气净化效率。这项新技术利用声波来聚集颗粒,同时激活摩擦电纳米发电机(TENGs)作为静电除尘器,创造了一种两种技术互补和相互增强的协同方法。声波在使用扬声器的u形声学谐振腔内产生,聚集颗粒并激发TENG在其电极之间产生高电场。这个高电场通过静电沉淀捕获聚集的微粒。在这项工作中使用了实验测试。在声场存在的情况下,电纺丝纳米纤维基TENG的峰值电输出约为60 V(峰对峰值)。此外,我们制作了一个按比例缩小的通风模型来检验颗粒过滤的效率。实验结果表明,该技术显著提高了对超细颗粒物(0.3 ~ 1.0µm)的去除效率。对PM2.5的最大去除效率可达97.5%,与HEPA过滤器相当。这项工作的结果证明了这种新型无过滤器空气净化方法的有效性和可控性。
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来源期刊
Nano Energy
Nano Energy CHEMISTRY, PHYSICAL-NANOSCIENCE & NANOTECHNOLOGY
CiteScore
30.30
自引率
7.40%
发文量
1207
审稿时长
23 days
期刊介绍: Nano Energy is a multidisciplinary, rapid-publication forum of original peer-reviewed contributions on the science and engineering of nanomaterials and nanodevices used in all forms of energy harvesting, conversion, storage, utilization and policy. Through its mixture of articles, reviews, communications, research news, and information on key developments, Nano Energy provides a comprehensive coverage of this exciting and dynamic field which joins nanoscience and nanotechnology with energy science. The journal is relevant to all those who are interested in nanomaterials solutions to the energy problem. Nano Energy publishes original experimental and theoretical research on all aspects of energy-related research which utilizes nanomaterials and nanotechnology. Manuscripts of four types are considered: review articles which inform readers of the latest research and advances in energy science; rapid communications which feature exciting research breakthroughs in the field; full-length articles which report comprehensive research developments; and news and opinions which comment on topical issues or express views on the developments in related fields.
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