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A cationic porous organic polymer for high-capacity, fast, and selective capture of anionic pollutants
- Zhi-Wei Liu, Cong-Xiao Cao, Bao-Hang Han
- Journal of hazardous materials 2019 v.367 pp. 348-355
- dyes, heavy metals, ion exchange, metal ions, pollutants, polymers, remediation, schiff bases, sulfates
- The emerging ionic porous organic materials have achieved various applications in different fields, however, there is limited study on using them to capture ionic pollutants from water. Here we demonstrate a facile method to prepare a cationic porous organic polymer via catalyst-free Schiff base reaction. The imidazolium-based polymer (ImPOP-1) was constructed through copolymerizing cationic molecules with low-cost benzidine. The as-prepared ImPOP-1 exhibits high capacity (e.g., 476.2 mg g–1 for Pd (II) and 578.5 mg g–1 for AO7−), excellent selectivity (e.g., more than 99% removal efficiency for Pd (II) in the presence of 100 times excess of SO42–), and fast kinetics (e.g., 98.6% removal efficiency within 5 min for Pd (II) ions) to the anionic pollutants including organic dyes and heavy metal ions. The excellent performance on scavenging anionic pollutants from water suggests that ImPOP-1 holds promising potential as an ion exchange material for water remediation.