Experimental investigation of a natural favonoid adsorption on macroporous polymers with intrinsic cis-diol moieties recognition function: Static and dynamic methods

- MPs-BA-1 possessed macroporous polymer network and accessible binding sites for cis-diols.
- MPs-BA-1 has excellent adsorption capacity, binding kinetics, specific affinity, and reusability.
- Dynamic adsorption incorporated with analysis of RSM determined the optimal conditions.
- The results could be facilely adopted to predict and design optimal conditions in the scale-up.

Macroporous polymers with boronate affinity ability (MPs-BA-1) were prepared via high internal phase emulsions (HIPEs) template and then applied to selective adsorption a natural favonoid luteolin (LTL). As-prepared MPs-BA-1 possessed macroporous polymer network and accessible binding sites for cis-diols, and its adsorption behaviors were studied using static and dynamic methods. In static conditions, adsorption amount of LTL increased rapidly in the first 30 min and reached to equilibrium in approximately 2.0 h. Superior conformity of the second-order model confirmed the chemical nature of the interaction between the LTL and binding sites. The fitting adsorption isotherm was a Langmuir type, and the maximum monolayer adsorption amounts at 298 K, 308 K and 318 K were 60.97 μmol g−1, 70.10 μmol g−1, and 55.03 μmol g−1, respectively. Dynamic adsorption incorporated with the analysis of response surface methodology (RSM) suggested that the optimal adsorption amount (73.47 μmol g−1) achieved when the flow rate of LTL solution was 3.0 mL min−1, temperature was 28.28 °C and concentration of LTL solution was 30 mg L−1. MPs-BA-1 served the specific adsorption towards LTL, and the recognition mechanism based on borate affinity was also described. MPs-BA-1 retained the adsorption amounts for successive cycles, but the loss using dynamic method was larger than in the batch method.

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