Adsorption characteristics of aromatic pollutants and their halogenated derivatives on bio-based poly (ether-pyridine)s

Abstract

In this work, innovative poly(ether pyridine) polymers obtained from bio-based monomers and pentafluoropyridine derivatives were elaborated in order to adsorb aromatic pollutants and their halogenated derivatives. These polymers were obtained with satisfactory yields by polycondensation of four pyridinium monomers (respectively based on morpholine, piperazine, dimethylamine and phenol) with isosorbide or bisphenol A. The adsorption efficiency data demonstrate that the poly(etherpyridine) based on isosorbide and morpholine-based monomer (P2) is the more efficient sorbent toward aromatic pollutants and their derivatives. Four aromatic pollutants, p-hydroxybenzoic acid, toluic acid, deisopropylatrazine, and 2,4,6-trichlorophenol, were chosen as the adsorbate to investigate the adsorption efficiency, kinetics and isotherms of the poly(ether pyridine) P2. The results demonstrate that the pseudo-second order was the best to describe the adsorption of the four target pollutants by the efficient sorbent P2 with good correlation. The experimental data of the four target pollutants adsorption were analyzed by Langmuir and Freundlich isotherms. Polymer P2 shows very high affinity (low 1/n value) for p-hydroxybenzoic acid and for 2,4,6-trichlorophenol, compared to other adsorbents. Three consecutive adsorption/desorption cycles toward eight aromatic pollutants were obtained for the efficient sorbent P2.