Recovery of Cr as Cr(III) from Cr(VI)-contaminated kaolinite clay by electrokinetics coupled with a permeable reactive barrier

- EK/PRB was applied to remediate Cr(VI)-contaminated kaolinite.
- EK/Fe3O4 PRB provided higher Cr recovery as Cr(III) in PRB than EK/Fe0PRB.
- Cr(III) recovery in Fe3O4 PRB was improved with the assistance of a CEM.