Research progress of nano zero-valentiron coupling clay for remediation of polluted soil

Clay-supported nZVI possess excellent comprehensive performance, such as low cost, easy preparation and environmental compatibility. On the basis of summarizing the modification strategies of nZVI, the effects of clay types on the morphology and properties of nZVI are compared. This paper poses the optimal order of ideal clay carrier, analyses the relationship between the iron content, specific surface area, nZVI size and the removal performance. The application of nZVI coupling clay for soil remediation, such as heavy metals, halogenated organics, nitrates, new pollutants in soil are reviewed, and the negative effects of nZVI technology in soil remediation are also summarized. Finally, the paper prospects the future direction of nZVI coupled clay technology and its mineral materials for remediation of polluted soil. © 2022 Chinese Society for Environmental Sciences. All rights reserved.