Imidazolium-based cationic polymeric nanotraps for efficient removal of Cr2O72-

Two imidazolium-based cationic polymeric nanotraps based on tetraphenylmethane building blocks (CPN-tpm) with different counterions were rationally designed and constructed for the efficient removal of Cr2O72- from wastewater. The influence adsorption performance was studied. With better wettability (contact angle as 28.61°), CPN-tpm-Cl exhibited a higher uptake capacity 366 mg g−1 capture faster ion exchange kinetic process in 20 min. While CPN-tpm-Br contact 83.16° showed lower maximum 324 g−1. In addition, can work wide pH range 2 to 10 possess excellent selectivity (such Cl-, NO3- SO42-) well good reusability 5 times. Such performances indicated that is promising candidate application. Our not only contributes removal, but also suggests new approach develop type adsorbents wastewater treatment.