Facile synthesis of a mesoporous organic polymer grafted with 2-aminoethanethiol for Hg<SUP>2+</SUP> removal

초록

By varying the amount of AlCl3 catalyst, highly interconnected lamella-shaped (IPOP) and spherically structured porous organic polymers (SPOP) were synthesized from terephthaloyl chloride and p-quaterphenyl via the Friedel-Crafts benzoylation reaction. The newly prepared materials were characterized by scanning electron microscopy, N-2 adsorption-desorption isotherms, X-ray photoelectron spectroscopy, and tested for Hg2+ removal in water after functionalization with 2-aminoethanethiol (NS). The stability under different pH and temperature conditions was confirmed, and the equilibrium and kinetics of Hg2+ adsorption were examined by varying the contact time, adsorbate concentration, and pH. The maximum adsorption capacities for Hg2+ by IPOP-NS and SPOP-NS were 769 and 526 mg g(-1), respectively, at 25 degrees C and pH 5, and the adsorption isotherm data conformed well to the Langmuir model. Adsorption equilibrium for IPOP-NS was reached within 10 min and exhibited a remarkable distribution coefficient of 1.06 x 10(8) mL g(-1). The kinetics of Hg2+ adsorption followed the pseudo second-order model. The influence of co-existing ions such as Na+, K+, Ca2+, Pb2+, Mg2+, and Fe3+ was also examined. IPOP-NS was superior in overall performance when compared to SPOP-NS and most of the other reported materials. IPOP-NS could be reused for a minimum of 10 consecutive runs without any detectable loss in adsorption capacity.

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