草酸与铁氧化物相互作用及光化学活化分子氧过程的研究进展

Environmental photochemical behaviors of iron minerals and oxalate and reactive oxygen species generation:A review

草酸与铁氧化物共存于自然环境中,二者之间的相互作用及光化学行为强烈影响着分子氧的活化.而分子氧活化影响共存体系中污染物的迁移与转化,是发展绿色污染控制氧化技术的关键.因此,探讨草酸与铁氧化物之间的相互作用与光化学活化分子氧是目前的研究热点之一.本文系统总结了近年来围绕草酸与铁氧化物相互作用以及草酸诱导铁氧化物活化分子氧的研究成果,论述了草酸在铁氧化表面的吸附与转化特性、草酸铁络合物光化学过程以及活性氧产生与转移途径,同时探讨了上述过程对环境污染物降解的影响,借此加深理解草酸诱导铁氧化物环境光化学行为与活化分子氧原理,并对今后的研究发展方向提出了展望,以期为利用天然铁氧化物和有机质发展原位环境修复技术提供依据.

Oxalic acid or oxalate(Ox)and iron minerals coexist in the natural environment.The interaction and photochemical behavior between Ox and iron minerals strongly affect the process of molecular oxygen activation.Molecular oxygen activation affects the migration and transformation of pollutants in the coexisting system,which is the key to the development of green pollution control oxidation technology.Therefore,exploring the interaction between Ox and iron minerals and subsequent photochemical activation of molecular oxygen is one of the current research hotspots.This review systematically summarizes the recent research on the interaction between Ox and iron minerals,the adsorption behaviors of Ox on the surface of iron minerals and its conversion features,Fe(Ⅲ)-oxalate complex photolysis,and reactive oxygen species(ROS)generation.Moreover,the influence of the above process on the degradation of pollutants is also discussed.This review can deepen the understanding of the photochemical transformation of organic contaminants with the activation of molecular oxygen by iron minerals,and put forward the prospect of future research development direction.Furthermore,this review may provide a basis for the development of in situ environmental remediation technologies using natural iron minerals and organic matter.