Add time:08/27/2019         Source:sciencedirect.com

Outdoor or indoor ozone pollution recently regains the attentions due to new findings on its risk even at very low level. The room-temperature catalytic material is key to abate indoor ozone pollution. Here we prepared a series of vanadium-doped MnO2 (V-MnO2) via a one-step hydrothermal redox reaction between MnO4− and Mn2+ with addition of vanadate. The vanadium-doped MnO2 exhibited weaker crystallinity with exposure of high-index facets such as (301), much larger specific surface area, enhanced surface acidity and had lower oxidation state of Mn. Accordingly, the amount of oxygen vacancies was greatly increased, which is not only revealed by H2-TPR and O2-TPD but also confirmed by stronger peroxide signals in electron paramagnetic resonance. V-MnO2(0.15) with the largest specific surface area of 309.8 m2/g not only exhibited stable activity for high concentration of ozone under humid condition, it also showed high ozone removal efficiency when it was coated on the low pressure-drop nonwoven fabric under the real filtration velocity. Thus, vanadium-doping is a facile method to improve the room-temperature activity of MnO2 for indoor ozone decomposition under the humid condition.

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