The adsorption performance of Cr(VI)-IIP prepared in this experiment was compared with that of other Cr(VI) adsorbents, such as equilibrium time, adsorption capacity and selectivity. As shown in Table 5, first, the Cr(VI)-IIP had a great advantage in selectivity compared with other common Cr(VI) adsorbents (Faleschini et al. 2023; Li et al. 2023c, 2023d; Mao et al. 2023), this was attributed to the strong specific recognition ability of Cr(VI) by the imprinted cavity left after the functional monomers chelated with the target ion during the preparation of Cr(VI)-IIP, illustrated that the effectiveness of ion imprinting technique. Afterwards, compared with Cr(VI)-imprinted polymers prepared from single functional monomer such as 4-VP (Nchoe et al. 2020), 3-aminopropyltriethoxysilane (APTES) (Zhang et al. 2022) and 1-vinylimidazole(1-VI) (Hassanzadeh et al. 2018), Cr(VI)-IIP showed a large improvement in adsorption capacity and selectivity. Finally, compared to Cr(VI)-imprinted polymers prepared with bifunctional monomers such as 4-VP/methyl methacrylate (MMA) (Neolaka et al. 2018) and 4-VP/2-hydroxyethyl methacrylate (HEMA) (Taghizadeh & Hassanpour 2017), the advantages of Cr(VI)-IIP were mainly reflected in the higher adsorption amount and superior selectivity, though its adsorption equilibrium time was not the shortest. Clearly, the advantage here was the establishment of the synergy between the pre-assembly system of bifunctional monomers and surface imprinting technology based on mesoporous silicon material SBA-15.
Comparison with other similar type of adsorbents for Cr(VI)
| Adsorbents . | Equilibrium time (min) . | Qe (mg/g) . | Selectivity interferent . | kanalyte/Interferent . | Reference . |
|---|---|---|---|---|---|
| Woolen sludge | 240 | 1.1 | – | – | Faleschini et al. (2023) |
| Biochar-supported nanoscale zero-valent iron | 30 | 48.45 | – | – | Mao et al. (2023) |
| Chitosan-coated magnetic carbon | 40 | 83.4 | – | – | Li et al. (2023d) |
| Mg/Al-layered double hydroxides | 180 | 177.88 | – | – | Li et al. (2023c) |
| β-cyclodextrin IIP(4-VP) | 720 | 16.9 | Cr(III) | 1.17 | Nchoe et al. (2020) |
| Diatom IIP(APTES) | 120 | 2.5 | Al(III) | 1.72 | Zhang et al. (2022) |
| Fe(III) | 1.42 | ||||
| Polyacrylonitrile IIP(1-VI) | 12 | 183.62 | Cr(III) | 3.448 | Hassanzadeh et al. (2018) |
| Cd(II) | 8.409 | ||||
| Cu(II) | 10.093 | ||||
| ANZ IIP(4-VP/MMA) | 30 | 4.365 | Pb(II) | 7.181 | Neolaka et al. (2018) |
| Ni(II) | 0.439 | ||||
| Magnetic multiwall carbon nanotubes (MMWCNTs) IIP(4-VP/HEMA) | 30 | 56.1 | Cu(II) | 12.32 | Taghizadeh & Hassanpour (2017) |
| Ni(II) | 16.39 | ||||
| MPS-modified SBA-15 IIP(4-VP/MAA) | 70 | 96.32 | Cr(III) | 15.00 | This study |
| Cu(II) | 9.63 | ||||
| Cd(II) | 16.67 | ||||
| Ni(II) | 12.50 |
| Adsorbents . | Equilibrium time (min) . | Qe (mg/g) . | Selectivity interferent . | kanalyte/Interferent . | Reference . |
|---|---|---|---|---|---|
| Woolen sludge | 240 | 1.1 | – | – | Faleschini et al. (2023) |
| Biochar-supported nanoscale zero-valent iron | 30 | 48.45 | – | – | Mao et al. (2023) |
| Chitosan-coated magnetic carbon | 40 | 83.4 | – | – | Li et al. (2023d) |
| Mg/Al-layered double hydroxides | 180 | 177.88 | – | – | Li et al. (2023c) |
| β-cyclodextrin IIP(4-VP) | 720 | 16.9 | Cr(III) | 1.17 | Nchoe et al. (2020) |
| Diatom IIP(APTES) | 120 | 2.5 | Al(III) | 1.72 | Zhang et al. (2022) |
| Fe(III) | 1.42 | ||||
| Polyacrylonitrile IIP(1-VI) | 12 | 183.62 | Cr(III) | 3.448 | Hassanzadeh et al. (2018) |
| Cd(II) | 8.409 | ||||
| Cu(II) | 10.093 | ||||
| ANZ IIP(4-VP/MMA) | 30 | 4.365 | Pb(II) | 7.181 | Neolaka et al. (2018) |
| Ni(II) | 0.439 | ||||
| Magnetic multiwall carbon nanotubes (MMWCNTs) IIP(4-VP/HEMA) | 30 | 56.1 | Cu(II) | 12.32 | Taghizadeh & Hassanpour (2017) |
| Ni(II) | 16.39 | ||||
| MPS-modified SBA-15 IIP(4-VP/MAA) | 70 | 96.32 | Cr(III) | 15.00 | This study |
| Cu(II) | 9.63 | ||||
| Cd(II) | 16.67 | ||||
| Ni(II) | 12.50 |