Polybenzoxazine: A Powerful Tool for Removal of Mercury Salts from Water

Chemistry - A European Journal


Omer S. Taskin, Baris Kiskan, Abdullah Aksu, Nuray Balkis, Jens Weber, Yusuf Yagci


Abstract: A reusable macroporous polybenzoxazine resin with high specific surface area was prepared as sorbent material for the removal of mercury salts. For this purpose, ally functional bisbenzoxazine was cured in dimethyl sulfoxide by thermally activated ring opening polymerization at 180°C for 3 days followed by freeze-drying processes. The porous structure of the resin was confirmed by SEM analysis and N2 adsorption/desorption studies at 77.3 K. Among various metal salts, namely Pb(II), Fe(II), Mn(II), Cu(II), Zn(II), and Cd(II), the porous polybenzoxazine resin exhibited a specific sorption behaviour against Hg(II) salt.

Mainly chemisorption and to some extend adsorption mechanisms were proposed for the observed high loading capacity of the resin.  As evidenced by FT-IR spectral analysis, the chemisorption is attributed to the coordination system formed between free OH and tertiary amine groups present in the polybenzoxazine structure with Hg(II) ions. It was also demonstrated that the porous polybenzoxazine can be regenerated simply by treatment with acids. The recycling ability of the resin is up to 7th cycle without any significant loss of activity and proved by the sorption and desorption experiments.

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