ABSTRACT
Scientists are striving to develop eco-friendly methods of wastewater treatment that avoid generating additional pollution. The heterogeneous Fenton process is a serious candidate, as it utilizes magnetic iron oxides as catalysts, which can be easily recovered and reused. It is also relatively safe for natural ecosystems and organisms in the food chain. For example, researchers have investigated the possibility of recycling catalysts modified with graphene, porous FeVO4 nanorods decorated on CeO2 nanocubes, and ferric sludge in Fenton-based wastewater treatment. Studies show that these catalysts retain their effectiveness even after multiple cycles. Another eco-friendly aspect of HFP is the use of agricultural by-products and waste materials as catalysts, such as carbon material prepared from agricultural nutshells and iron, and K2S2O8 with the addition of persulfate. This method is thus an effective way to reduce waste and save raw materials. The use of scrap iron or steel as a catalyst is also an advantage of the process.
