Products Cited in Publications Worldwide Triazine- and Heptazine-Based Porous Organic Polymer Networks for the Efficient Removal of Perfluorooctanoic Acid

Triazine- and Heptazine-Based Porous Organic Polymer Networks for the Efficient Removal of Perfluorooctanoic Acid

Abdullatif, Dana; Khosropour, Ahmadreza; Khojastegi, Anahita; Mosleh, Imann; Khazdooz, Leila; Zarei, Amin; Abbaspourrad, Alireza

DOI:

Abstract

The presence of perfluorooctanoic acid, a perfluoralkyl substance, in water sources has raised health concerns due to its toxicity. Finding effective adsorbents is essential to ensure healthy sources of water for consumption. In this study, a heptazine-based polymer network (Py-HPOP) was synthesized using a one-pot nucleophilic substitution of 2,5,8-trichloro-s-heptazine (TCH) with 4,4′,4′′,4′′′-(pyrene-1,3,6,8-tetrayl) tetraaniline (Py-TA). For comparison, a triazine-based polymeric network (Py-TPOP) was also prepared using 2,4,6-trichloro-1,3,5-triazine under similar conditions. Both polymers were used to treat aqueous solutions containing 1 mg/L PFOA. Py-TPOP exhibited superior adsorption capacity (98.4% PFOA removal) relative to Py-HPOP (80.8% PFOA removal) despite Py-HPOP′s higher Brunauer-Emmett-Teller (BET) surface area SBET at 205 m2 g-1. The effect of electrostatic interactions was also observed as a critical factor for PFOA adsorption as demonstrated by the change in PFOA adsorption by both polymers under basic, neutral, and acidic conditions. This investigation illustrates a facile synthesis of amorphous covalent frameworks as strong, competitive adsorbents for PFOA removal from water.

Keywords

perfluoroalkyl substance ; perfluorooctanoic acid ; triazine ; heptazine ; porous organic polymer

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4-Aminophenylboronic acid pinacol ester

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4-Aminophenylboronic acid pinacol ester

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