Photocatalysis-fenton Reaction Synergistically Degrade Organic Pollutants

With economic and social development,environmental pollution and energy shortage have become important issues in the world.Semiconductor photocatalysis and heterogeneous Fenton reaction are used in environmental remediation because of their environmental protection,low consumption and mild reaction.The system can realize the valence state recycling of Fe³⁺/Fe²⁺in the Fenton reaction,and the charge transfer improves the photo-generated charge separation efficiency.The Fe-doped g-C₃N₄ photocatalyst was synthesized by thermal polycondensation method,and H₂O₂ was added under visible light irradiation to form photocatalytic-Fenton synergy system,which showed excellent removal ability for phenol and complex wastewater and realized recycling of catalyst.The recycling of Fe can be achieved in the heterogeneous system,which avoids the problems for the recycling and secondary pollution of Fe ions in homogeneous Fenton reaction.After optimizing the reaction parameters,the complex wastewater system was further processed.The system can reduce the COD and TOC values of 300 ml coking wastewater from 64.6 and 25.3 mg/L to 22.8 and 12.3 mg/L in 60 min.The removal rate increased by 57.1%and 76.1%,respectively,reaching the national emission standards.In order to achieve rapid and efficient recovery of the catalyst,reduced graphene oxide?rGO?was added to the catalyst,and a three-dimensional graphene Fe-g-C₃N₄hydrogel was formed by VC reduction.It also exhibits excellent degradation ability for organic pollutants.After 7 cycles,the degradation efficiency was 86.9%.The hybridization of graphene promotes the rapid migration and separation of photogenerated charges.At the same time,the graphene gel has a micron-dimensional three-dimensional network structure.The recovery and regeneration of the catalyst can be realized by using the filter screen,and the complex catalyst filtration recovery system is avoided.Figure 28;Table 4;Reference 126...