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Removal of hexavalent chromium from wastewater by chelating resin supported Fe/Cu bimetallic nanoparticles: Characterization, performance and mechanisms

Fig 5

Cr 2p XPS analysis of M-Fe/Cu-2 after reaction for different time: (a) 5 min, (b) 15 min, (c) 60 min, (d) 90 min, (e) 180min, (f) 360 min.

Fig 5

doi: https://doi.org/10.1371/journal.pone.0318180.g005