Facile synthesis of Melamine-Modified porous organic polymer for mercury (II) removal

In this study, a novel porous organic polymer modified by melamine (MA-POP) was prepared via a postmodification procedure for the Hg2+ removal from aqueous solutions. The use of melamine as the rigid crosslinker endowed the polymer with high surface area (669 m2 g-1), total pore volume (0.668 mL g-1) and nitrogen content. The material exhibited rapid adsorption kinetic for Hg2+, and the adsorption equilibrium can be reached within 10 min. The adsorption progress was more satisfyingly described by the pseudo-second-order kinetic model and the Langmuir isotherm model with a maximum adsorption capacity of 351.6 mg g-1. XPS and FT-IR spectra suggested that the main adsorption mechanism was chelation between nitrogen groups and Hg2+. Besides, the adsorbent possessed high adsorption selectivity towards Hg2+ in the presence of other eight coexisting metal ions and maintained good adsorption capacity even after five cycles. Therefore, the obtained MA-POP is qualified as a reliable adsorbent for Hg2+ removal.

Automated summary

A novel porous organic polymer modified by melamine (MA-POP) was prepared for efficient removal of Hg2+ from aqueous solutions. The material exhibited rapid adsorption kinetics, high adsorption selectivity towards Hg2+, and good adsorption capacity even after multiple cycles, making it a reliable adsorbent for Hg2+ removal.