The point of zero charge (pZC) indicates the pH at which a photocatalyst's surface has no net charge, influencing its interaction with pollutants. Operating at a solution pH above the pZC typically enhances photocatalytic degradation efficiency by promoting electrostatic attraction between the negatively charged catalyst and cationic pollutants.
Preethi Shetty
It is known that ultraviolet radiation irradiation by absorption of UV photons leads to generation of electron-hole pairs in titanium dioxide particles. Migration of these charge carriers to the surface allows them to participate in oxidation-reduction reactions with dissolved oxygen and water molecules, resulting in the formation of active forms of oxygen, such as superoxide anion and short-lived hydroxyl radical. Increasing the pH of the solution will reduce the migration of -OH groups to the surface, and the zero point of charge will promote their migration.
Article CHARACTERIZATION AND PHOTOCATALYTIC PROPERTIES OF TITANIUM D...
How Negative charged catalyst react to ciprofloxacin solution pH which is higher than pzc and result in higher degradation efficiency
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