The Photo-Fenton process is an enhancement of the Fenton process that uses UV or visible light to regenerate Fe2+ from Fe3+, thereby sustaining the production of hydroxyl radicals. The key reactions in the Photo-Fenton process are:
Fe3+ + H2O + hv → Fe2+ + •OH + H+
This additional photochemical step increases the efficiency and effectiveness of the process, especially under natural sunlight or artificial UV light sources.
