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 S
BET 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.
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