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Resin Adsorption Kinetics
The magnetic ion exchange resin (MIER) to remove drugs from water is used as an example to explain the resin adsorption kinetics. Two magnetic ion-exchange resins with different physical and chemical properties, MIER1 and MIER2, are used to remove the three non-steroidal anti-inflammatory drugs ibuprofen (IBU) and diclofenac (DC) and the widely used antibiotic sulfadiazine (SDZ). It is found that under different initial concentrations, the adsorption capacity of SDZ and DC on MIER2 is always higher than that of MIER1. It shows that the physical and chemical properties of the resin, such as surface exchange capacity, BET surface area and pore size, may play an important role in removing drugs.
Fig. 1 Comparison of MIER1 and MIER2 on adsorption capacity. (Jiang M, et al. 2015)
The adsorption kinetics quantitatively describes the drug removal efficiency of MIER. Figure 2 shows the adsorption kinetics of DC, SDZ and IBU on the two resins at different initial concentrations. These drugs show relatively fast adsorption kinetics on both resins. Rapid removal occurred within the first 100 minutes, and then the removal rate slowed down significantly and reached equilibrium in less than 10 hours. In addition, Figure 2 also shows that the initial concentration has no effect on the equilibration time.
Fig. 2 Adsorption kinetics of DC, SDZ, and IBU on MIER1 and MIER2 with different initial concentrations.
Fig. 3 Adsorption isotherms of DC, SDZ, and IBU on MIER1 and MIER2 at 298 K.
The adsorption isotherms of IBU, DC and SDZ to MIER1 and MIER2 are shown in Figure 3. DC, SDZ, and IBU exhibit different behaviors as a function of concentration. Because MIER1 has a higher BET surface area and larger pore size, the adsorption capacity of IBU on MIER1 is significantly greater than that on MIER2. These results further confirm that the BET surface area and pore size are the main factors affecting the adsorption affinity of IBU.
The above results indicate that the physical and chemical properties of the resin, functional groups, and the type of adsorbent will affect the adsorption effect.
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- Jiang M, et al. Adsorption of three pharmaceuticals on two magnetic ion-exchange resins[J]. Journal of Environmental Sciences, 2015.