A lottery draw machine-inspired movable air filter with high removal efficiency and low pressure drop at a high flow rate?

Journal of Materials Chemistry A Pub Date: 2019-02-11 DOI: 10.1039/C9TA00100J

Abstract

A lottery draw machine-inspired novel movable air filter (MAF) system is presented in which MAFs are vigorously moved or rotated to generate a high electric field and capture particulate matter (PM) particles. The MAF system purified 500?mL of a hazardous level of PM particles (2016 μg m?3 PM10 and 1040 μg m?3 PM2.5) at a high flow rate of 2.5 m s?1 with high removal efficiencies (99.7% and 98.8% for PM10 and PM2.5, respectively) in 1 min. The MAF system also had a small pressure drop of 3–6 Pa, which was approximately an order or orders of magnitude lower than previously reported values, even at a high flow rate of an order of magnitude higher than previously reported values. The MAF system exhibited excellent recyclability of up to 300 cycles with high removal efficiencies (99.7–98% and 98.8–96.2% for PM10 and PM2.5, respectively). Furthermore, the MAF system could effectively remove 500 mL of PM particles at extremely high concentrations (over 10?000 μg m?3 PM10 and over 3000 μg m?3 PM2.5) with very high efficiencies (over 99.8% and 99.6%, respectively) and a very low pressure drop (6 Pa), and these properties led to the conversion to clean ambient air (24 μg m?3 PM10 and 12 μg m?3 PM2.5) in 15 min.

Graphical abstract: A lottery draw machine-inspired movable air filter with high removal efficiency and low pressure drop at a high flow rate
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