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. 2021 Mar 18;16(3):e0248487. doi: 10.1371/journal.pone.0248487

Fig 2. Color change in chemical indicator based on pyrrole-Nafion films.

Fig 2

Nafion was deposited onto blotting paper strips and overlaid with pyrrole. The strips were then passed through the Gas Phase Advanced Oxidation Process reactor operating at 3% v/v hydrogen peroxide delivered at 40 ml/min, UV-C dose of 113 mJ/cm2 and ozone being delivered through the 30 s treatment. Additional strops were passed through the gAOP unit with hydrogen peroxide, UV-C or ozone alone. A non-treated control acted as a comparison.