Poly(N-isopropylmethacrylamide-co-4-acrylamidobenzo-18-crown-6) microgels with expanded networks for excellent adsorption of lead(II) ions (Open Access)--颗粒学报PARTICUOLOGY

Wang, F., Liu, Z., Xie, R., Ju, X.-J., Wang, W., Pan, D.-W., & Chu, L.-Y. (2023). Poly(N-isopropylmethacrylamide-co-4-acrylamidobenzo-18-crown-6) microgels with expanded networks for excellent adsorption of lead(II) ions. Particuology, 77, 105-115. https://doi.org/10.1016/j.partic.2022.09.002

Poly(N-isopropylmethacrylamide-co-4-acrylamidobenzo-18-crown-6) microgels with expanded networks for excellent adsorption of lead(II) ions (Open Access)

Fang Wang ^a, Zhuang Liu ^{a b *}, Rui Xie ^{a b}, Xiao-Jie Ju ^{a b}, Wei Wang ^{a b}, Da-Wei Pan^a, Liang-Yin Chu ^{a b *}

a School of Chemical Engineering, Sichuan University, Chengdu, Sichuan, 610065, China
b State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, Sichuan, 610065, China

10.1016/j.partic.2022.09.002

Volume 77, June 2023, Pages 105-115

Received 1 August 2022, Revised 27 August 2022, Accepted 9 September 2022, Available online 17 September 2022, Version of Record 2 December 2022.

E-mail: liuz@scu.edu.cn; chuly@scu.edu.cn

Highlights

• Poly(N-isopropylmethacrylamide-co-4-acrylamidobenzo-18-crown-6) (PNMB) microgels are developed.

• PNMB microgels exhibit expanded structures with low steric hindrance for adsorbing Pb²⁺.

• Maximum Pb²⁺ adsorption capacities of PNMB₄ microgels are as high as 431.5 mg/g.

• Adsorption mechanism of PNMB microgels is Langmuir isotherm model.

Abstract

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 PbPb²⁺-recognizable microgels with excellent adsorption capacity to Pb²⁺, which are fabricated 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 at α-carbon could descend the polarity of Cdouble bondO 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.

Graphical abstract

Keywords

Microgels; Expanded polymeric networks; Crown ethers; Host-guest complexation; Pb²⁺ adsorption

文章导读