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 1Parameters in fixed-bed column for Cr(VI) adsorption by Cr(VI)-IIP and NIP
Sorbents
. | tb (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 |
Sorbents
. | tb (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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