We have fabricated a pillar[5]arene-based conjugated polymer, pillar[4]arene[1]terephthalic acid-derivatized poly- p -phenylene pillar[4]arene[1]terephthamide (P[5]-PPTA), which demonstrated exceptional adsorption capability toward low-molecular-weight alkylamines, alcohols, and carboxylic acids in water. In addition, P[5]-PPTA could be thermally reactivated and reused at least five times without obvious decrease of adsorption capability. A mechanistic study indicated that the absorption results from the host–guest interaction between the pillar[5]arene rings in P[5]-PPTA and the low-molecular-weight short-chain alkyl derivatives.
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Wang et al. (2020) studied this question.
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