In the fixed-bed experiments, Cr(VI)-IIP and NIP were filled into the dynamic column, and the dynamic adsorption properties of Cr(VI) by the two adsorbents were investigated. The breakthrough curves of the two adsorbents were performed in Figure 10 and the corresponding parameters were given in Table 1. The curve penetration time tb and adsorption saturation time te of Cr(VI)-IIP lagged behind that of NIP obviously, which resulted in a higher saturation adsorption amount qequation of Cr(VI)-IIP than NIP under the same conditions. According to the calculation, the qequation of Cr(VI)-IIP and NIP were 10.02 and 3.47 mg/g, respectively, which showed that Cr(VI)-IIP still had specific adsorption performance for target ions in the dynamic adsorption experiment. In addition, the qequation of Cr(VI)-IIP and NIP were slightly lower than the equilibrium adsorption capacity Qe (14.08 and 8.62 mg/g) in the static adsorption experiment, which might be caused by the short contact time between Cr(VI) in solution and adsorbents when it flowed through the fixed bed in the dynamic adsorption experiment. On the whole, the dynamic adsorption behavior of Cr(VI)-IIP was relatively ideal, and the dynamic adsorption efficiency Y was as high as 71.57%, indicating that Cr(VI)-IIP prepared from bifunctional monomer was an ideal SPE adsorbent to treat Cr(VI) in aqueous solution.
Table 1

Parameters in fixed-bed column for Cr(VI) adsorption by Cr(VI)-IIP and NIP

Sorbentstb (min)te (min)qtotal (mg)qequation (mg/g)VE (L)Y (%)
Cr(VI)-IIP 80 140 1.00 10.02 140 71.57 
NIP 20 105 0.35 3.47 105 33.05 
Sorbentstb (min)te (min)qtotal (mg)qequation (mg/g)VE (L)Y (%)
Cr(VI)-IIP 80 140 1.00 10.02 140 71.57 
NIP 20 105 0.35 3.47 105 33.05 
Figure 10

Dynamic adsorption curves of Cr(VI)-IIP and NIP for Cr(VI).

Figure 10

Dynamic adsorption curves of Cr(VI)-IIP and NIP for Cr(VI).

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