Abstract
Separation of the small amount of multi-component oxyterpenes over terpenes is imperative to improve the quality of essential oils, but challenging owing to their close molecular structure and similar properties. In this work, a new class of ionic polymers P(Aryl-Im-BCMBP) are constructed by employing well-designed monomer and crosslinker through a “one-pot two-step” strategy. The obtained polymers, combining multiple hydrogen-bonding sites and well-developed porosity, achieve excellent oxyterpene adsorption capacity (454.5 mg·g−1 citral or 352.1 mg·g−1 linalool), 2.1–5.0 times higher oxyterpene/terpene separation selectivity than commercial adsorbents and good liquids breakthrough performance. Quantum chemistry calculation results demonstrate that the multiple hydrogen-bonding interactions between ionic site and oxyterpene play an important role for selective oxyterpene adsorption. This study may shed light on the separation of high value-added structurally similar natural products.
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