富电子材料促进芬顿反应中 Fe³⁺ 还原的研究进展

Fenton reaction, as an efficient advanced oxidation technology, can degrade organic niacrornolecular substances into small molecular substances without selectivity by hydroxyl radicals (• O H) and other active species produced in the reaction process, and even completely mineralize and remove the organic matter from water. However, the traditional Fenton reaction process produces a large amount of solid waste precipitation such as iron sludge, which limits its large-scale application. For this problem, this paper discusses the generation principle of iron sludge in Fenton reaction, mainly because Fe²⁺ are oxidized to Fe³⁺ after catalyzing H₂O₂ to produce hydroxyl radicals, while Fe³⁺ lose the catalytic activity and precipitate from the reaction system as sludge. In order to maintain the continuous and efficient catalytic performance of Fenton system and reduce the production of iron sludge, a large number of studies have introduced electron-rich materials into Fenton reaction system to promote the conversion of Fe³+ to Fe²⁺ including zero-valent iron, carbon materials, metal-organic framework polymers (MOF), hydroxylamine, quinone hydroquinone, organic acids and boron. These electron-rich materials can provide electrons for Fe³⁺ reduction in Fenton reaction process, promote the cycle of Fe ³⁺/Fe²⁺ improve Fenton reaction efficiency and reduce solid waste generation. The mechanism, influencing factors and existing problems of electron-rich materials promoting Fenton reaction are also analyzed in this paper to provide a theoretical basis for improving the efficiency of Fenton reaction and broadening its application scenarios.