π-Complexation is a common mechanism in several adsorption processes such as ADS or ADN over MOFs [127] and [128]. However, for aqueous-phase adsorption, π–π interactions/stacking are observed rather than π-complexation. Qin et al. reported adsorptive removal of bisphenol-A (BPA) from aqueous solution over two highly porous MOFs, MIL-101-Cr and MIL-100-Fe, and the results were compared with those obtained using AC [129]. The order of kinetics is AC < MIL-100-Fe < MIL-101-Cr, and the primary reason for this trend is the average pore diameter (the order of the pore diameters is AC < MIL-100-Fe < MIL-101-Cr). In contrast, the maximum adsorption capacities follow the order MIL-100(Fe) < AC < MIL-101-Cr, and the maximum adsorption of BPA over MIL-101-Cr is 252.5 mg/g, which is 4.54 and 1.84 times higher than those of MIL-100-Fe and AC, respectively. Although the mechanism has not been clearly explained, the main reason for the high adsorption of BPA over MIL-101-Cr is suggested to be the π–π interactions between the benzene rings of BPA and MIL-101, along with partial hydrogen bonding. Similar π–π interactions were also suggested for the adsorption of BPA over MIL-53 [130] and adsorption of malachite green over MIL-100-Fe [131].
π-Complexation is a common mechanism in several adsorption processes such as ADS or ADN over MOFs [127] and [128]. However, for aqueous-phase adsorption, π–π interactions/stacking are observed rather than π-complexation. Qin et al. reported adsorptive removal of bisphenol-A (BPA) from aqueous solution over two highly porous MOFs, MIL-101-Cr and MIL-100-Fe, and the results were compared with those obtained using AC [129]. The order of kinetics is AC < MIL-100-Fe < MIL-101-Cr, and the primary reason for this trend is the average pore diameter (the order of the pore diameters is AC < MIL-100-Fe < MIL-101-Cr). In contrast, the maximum adsorption capacities follow the order MIL-100(Fe) < AC < MIL-101-Cr, and the maximum adsorption of BPA over MIL-101-Cr is 252.5 mg/g, which is 4.54 and 1.84 times higher than those of MIL-100-Fe and AC, respectively. Although the mechanism has not been clearly explained, the main reason for the high adsorption of BPA over MIL-101-Cr is suggested to be the π–π interactions between the benzene rings of BPA and MIL-101, along with partial hydrogen bonding. Similar π–π interactions were also suggested for the adsorption of BPA over MIL-53 [130] and adsorption of malachite green over MIL-100-Fe [131].
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