Polyacrylic Acid Grafted Carbon Nanotubes for Immobilization of Lead(II) in Perovskite Solar Cell

Jinpei Wang, Renyan Zhang^a, Hui Xu,* Yonghua Chen, Hui Zhang,* and Nam-Gyu Park*

Hui Xu − Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China.

Hui Zhang − Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University, Nanjing 211816 Jiangsu, China; School of Chemical Engineering, Sungkyunkwan University, Suwon 16419, Korea.

Nam-Gyu Park − School of Chemical Engineering and SKKU Institute of Energy Science and Technology (SIEST), Sungkyunkwan University, Suwon 16419, Korea.

Abstract: A graphene-enhanced supramolecular hydrogel containing poly(acrylic acid) (PAA) and poly(4-vinylpyridine) (P4VP) was fabricated for the wastewater remediation. In this work, P4VP brushes were grown from functionalized graphene oxide (GO) through surface-initiated atom transfer radical polymerization. Then, the P4VPgrafted GO (i.e., GO-g-P4VP) was integrated into PAA matrix to form GO-g-P4VP@PAA hydrogel as a highly efficient adsorbent for extraction of toxic metal ions from wastewater. Due to the introduction of GO-g-P4VP, the GO-g-P4VP@PAA composite hydrogel exhibited good compressive strength, and a special interconnected 3D porous network was formed in the hydrogel. The effect of pH, initial heavy metal ion concentration, contact time, and adsorbent dosage regarding the adsorption capacity and removal efficiency of Pb²⁺ and Cd²⁺ on the hydrogel was examined. Under appropriate conditions, the GO-g-P4VP@PAA hydrogel can achieve maximum adsorption capacities of 257.28 mg/g for Pb²⁺, 175.79 mg/g for Cd²⁺. The adsorption kinetics of Pb²⁺ and Cd²⁺ on the GO-g-P4VP@PAA hydrogel followed a pseudo-second order model and the adsorption isotherms were more consistent with the Langmuir isotherm model. In addition, the GO-g-P4VP@PAA hydrogel exhibited good reusability. After five cycles, the removal efficiency of both Pb²⁺ and Cd²⁺ still remained above 80%. These results demonstrate the GO-g-P4VP@PAA hydrogel serves as a desirable adsorbent in removal of heavy metal cations from wastewater.

ACS Energy Lett. 2022, 7, 1577−1585 (2022年影响因子: 23.991)

论文链接：https://pubs.acs.org/doi/10.1021/acsenergylett.2c00644