Interactions between lepidocrocite and heavy metals:Research progress from interfacial processes to environmental behaviors
The biogeochemical cycle of iron plays a key role in the migration and transformation processes of soil materials,especially in the environmental behavior of heavy metals.Lepidocrocite is a common metastable iron(hydroxyl)oxide that typically found in soils with seasonal redox alternations.It has a large specific surface area and high surface activity,and can drive soil material circulation.This article takes the stability of lepidocrocite as a link,to explain the evolutionary patterns of its three different roles of as an original mineral,precursor(intermediate product)and final product in different transformation pathways.The interaction mechanism between formation/transformation of lepidocrocite and fate of heavy metals was systematically discussed from the perspective of biogeochemical cycles.The impact of typical environmental factors(such as pH,oxyanions,dissolved organic matter and microorganisms)on the stability of lepidocrocite and the occurrence forms of heavy metals was focused on.Future research trends include the transformation mechanism of iron minerals in complex environments,the microscopic reaction mechanism of heavy metals at the mineral-water interface,and the regulation of environmental factors on the fate of heavy metals.These studies aim to provide solutions for pollution remediation by regulating the iron cycle and understanding the occurrence status of heavy metals.Additionally,they offer insights for predicting the environmental behavior of heavy metals under the influence of iron minerals.
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