Mechanism insights into enhanced Cr(VI) removal using nanoscale zerovalent iron supported on the pillared bentonite by macroscopic and spectroscopic studies

► Al-bent enriched Cr(VI) on NZVI surface, leading to the enhanced removal. ► The NZVI/Al-bent composite exhibited good stability and reusability. ► XAFS results showed transfer of precipitates from iron surface to Al-bent.