Lead(Ⅱ)(Pb2+)ions are toxic heavy metal ions that can accumulate in the human body through water and cause severe health problems,including neurotoxicity,nephrotoxicity,hematological toxicity and even genotoxicity ef...Lead(Ⅱ)(Pb2+)ions are toxic heavy metal ions that can accumulate in the human body through water and cause severe health problems,including neurotoxicity,nephrotoxicity,hematological toxicity and even genotoxicity effects.To remove Pb2+selectively and effectively from aqueous solutions,we develop a novel type of Pb2+-recognizable microgels with excellent adsorption capacity to Pb2+,which are fabri-cated from 4-acrylamidobenzo-18-crown-6(B18C6Am)and N-isopropylmethacrylamide(NIPMAM)monomers by precipitation copolymerization method.The prepared poly(N-isopropylmethacrylamide-co-4-acrylamidobenzo-18-crown-6)(PNMB)microgels exhibit expanded structures,because the electron-donating methyl groups atα-carbon could descend the polarity of C=O in the NIPMAM monomers and thus weaken the polymer segment…segment interactions.The expanded structures of PNMB microgels are beneficial for adsorption of Pb2+due to the low steric hindrance in the polymeric networks.The Pb2+adsorption isotherms of PNMB microgels are consistent with the Langmuir model for monolayer adsorption.The results indicate that the prepared Pb2+-recognizable PNMB microgels are highly promising for the selective removal of lead(Ⅱ)ions from aqueous solutions.展开更多
基金support from the National Natural Science Foundation of China(grant Nos.21991101,22022810).
文摘Lead(Ⅱ)(Pb2+)ions are toxic heavy metal ions that can accumulate in the human body through water and cause severe health problems,including neurotoxicity,nephrotoxicity,hematological toxicity and even genotoxicity effects.To remove Pb2+selectively and effectively from aqueous solutions,we develop a novel type of Pb2+-recognizable microgels with excellent adsorption capacity to Pb2+,which are fabri-cated from 4-acrylamidobenzo-18-crown-6(B18C6Am)and N-isopropylmethacrylamide(NIPMAM)monomers by precipitation copolymerization method.The prepared poly(N-isopropylmethacrylamide-co-4-acrylamidobenzo-18-crown-6)(PNMB)microgels exhibit expanded structures,because the electron-donating methyl groups atα-carbon could descend the polarity of C=O in the NIPMAM monomers and thus weaken the polymer segment…segment interactions.The expanded structures of PNMB microgels are beneficial for adsorption of Pb2+due to the low steric hindrance in the polymeric networks.The Pb2+adsorption isotherms of PNMB microgels are consistent with the Langmuir model for monolayer adsorption.The results indicate that the prepared Pb2+-recognizable PNMB microgels are highly promising for the selective removal of lead(Ⅱ)ions from aqueous solutions.
