Advanced Oxidation Process as a Green Technology for Dyes Removal from Wastewater: A Review

The combination of green chemistry and green engineering is needed for the production of minimum waste, renewable sources, increasing utilization of raw materials, the use of simpler and safer products, and novel technologies. The use of novel cleaner technologies leads to effective production in chemical industries. The dyes involve a complex structure, recalcitrant nature, and more intermediates. The generation of oxidative species with higher yields is obtained by advanced oxidation processes as a green and powerful treatment technology. These processes are effective, inexpensive, and eco-friendly methods for decaying toxic pollutants. The AOPs are classified as non-photochemical and photochemical processes. There are included various technologies such as ozonation, Fenton oxidation, wet air oxidation, electrochemical oxidation, and photocatalytic oxidation. The production of highly reactive free radicals is the main purpose of the AOPs process. The generation of free radical increases by the combination of two or more AOPs processes that leads to higher oxidation rates. This study was aimed to present the various attempts for degradation dyes in textile wastewater using the diverse advanced oxidation processes.