Graphitic carbon nitride is used as a visible-light photocatalyst to boost ozonation in water treatment

Author(s): Ezeh E M

By either directly photolyzing ozone with UV light or employing a photocatalyst that can be excited by UV-Vis or solar light, advanced oxidation processes (AOPs) can boost ozone’s efficiency.The literature on the use of ozone and the g-C3N4 photocatalyst to break down probe molecules in water, including oxalic, p-hydroxybenzoic, and oxamic acids, ciprofloxacin, and parabens, is compiled in this review.g-C3N4 is an abundant element-based metal-free visible-light photocatalyst that creates a synergistic effect with ozone.The combination of photocatalysis and ozonation is more effective than either of the two methods on their own.This synergy is thought to originate in the effective electron quenching of photogenerated conduction band electrons by O3 in the g-C3N4 photocatalyst, as demonstrated by the available data.Due to the widespread use of ozonizers in water treatment, it is suggested that using ozonizers in conjunction with g-C3N4 photocatalysis could also increase the effectiveness of ozone in the AOPs of actual waste waters.