A Comparative Electrochemical-Ozone Treatment for Removal of Phenolphthalein

Figure 2

(a) UV-Vis PHPH peaks at different pH values: () 9, (—) 7, and (--) 3. (b) Chemical species distribution diagram, protonated and deprotonated: () C₂₀H₁₄O₄ and () C₂₀H₁₂O₄.

(a)

(b)