Selective Separation Of Polyphenols With a Novel Azo Porous Organic Polymer: Ultrahigh Adsorption Capacity And Superfast Adsorption Rate

Abstract

A novel diazo-coupling-based porous organic polymers (POPs) namely Cin-POP was constructed under normal temperature and pressure using less toxic basic fuchsin and natural cinnamic acid as the building block. Owing to the advantages of porous structures, abundant aromatic groups, good thermal stability and well dispersity, Cin-POP exhibit remarkable adsorption rates and capacities towards polyphenols including procyanidine and rutin. Especially for procyanidine, the adsorption efficiency can arrive nearly 99.1 % within 2.5 min and the pseudo-second-order rate constant (k2) of Cin-POP is 0.0257 g mg−1 min−1. The maximum adsorption capacities of Cin-POP towards procyanidine and rutin are 2500.00 mg g−1 and 1814.83 mg g−1, outpacing of all reported adsorbents. In addition, Cin-POP can selectively adsorb polyphenols among the mixtures of polyphenols and alkaloids. More importantly, Cin-POP can be used for polyphenols separation from complex cinnamon extract. All the above advantages make Cin-POP comparable porous adsorbent for polyphenols separation.

Keywords: Azo porous organic polymers, Selective separation, Superfast adsorption rate, Ultrahigh adsorption capacity, Polyphenols