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Non-thermal plasma mitigation of low concentration of air pollutants: removal of isopropyl alcohol using transition metal-oxide integration

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Abstract

The present work studied the decomposition of isopropyl alcohol (IPA), widely used in chemical industries and households, in a packed-bed dielectric barrier discharge (DBD) plasma reactor. Metal oxide (MOx) coated on γ-Al2O3 (M = Cu, Mn, Co) was utilized for packing. The plasma-packed mode was a likely alternative to the conventional removal techniques, as it aids the conversion of dilute concentrations of IPA to CO and CO2 at ambient conditions (room temperature and atmospheric pressure). The mean electron energy calculations suggest that electrons with higher energy are generated when the discharge zone is packed with catalysts. When comparing IPA conversion (input concentration of 25 ppm) for no packing mode and MOx/γ-Al2O3 coupled plasma mode, the latter method enhances conversion to greater than 90% at an applied voltage of 18 kV. Also, MOx/γ-Al2O3 showed the highest selectivity to CO2 (70%) compared to plasma-only mode (45%). The metal-oxide layer provides the necessary catalytic surface facilitating the oxidation of IPA to COx through active oxygen species or the interaction of surface hydroxyl groups. The use of MOx/γ-Al2O3 resulted in about 90% carbon balance and reduced ozone generation, demonstrating the significance of integrating metal oxide to achieve efficient conversion and maximal selectivity towards the desired products.

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Acknowledgements

The authors are grateful to DST-SERB, India, for providing the research fellowship.

Funding

This work was supported by DST-SERB, India (EMR/2016/005636), and UAY (IITH_007).

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Bhargavi Kandukuri: conceptualization, investigation and formal analysis, and writing original draft. Supriya Das: investigation and formal analysis. Umamaheswara Rao Mudadla: investigation and formal analysis. Giridhar Madras: conceptualization and investigation. Shashidhar Thatikonda: funding acquisition and project administration. Subrahmanyam Challapalli: funding acquisition and project administration, writing, review, editing, and supervision.

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Correspondence to Subrahmanyam Challapalli.

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Kandukuri, B., Das, S., Mudadla, U.R. et al. Non-thermal plasma mitigation of low concentration of air pollutants: removal of isopropyl alcohol using transition metal-oxide integration. Environ Sci Pollut Res (2024). https://doi.org/10.1007/s11356-024-32569-7

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  • DOI: https://doi.org/10.1007/s11356-024-32569-7

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