Water pollution is a major problem that requires proper treatment. 4-nitrophenol (4 NP) is an organic water pollutant which is very dangerous for living things because it has mutagenic, phytotoxic and cytotoxic effects. Pollutants 4-NP in water can be degraded into harmless compounds by the photocatalyst method. The semiconductor-based photocatalytic process has a mechanism for destroying vario…