Figure 2

FTIR spectrum analysis of nWTRs before and after Cr(VI) adsorption (A), and Fractionation of adsorbed Cr (VI) on different particle sizes of WTRs Notice that Cr (VI) adsorbed on nWTRs was mostly associated with the less mobile fraction (residual fraction, RS), which indicates the high capability of nWTRs to immobilize Cr (VI) (B).