Synthesis and performance of guanidinium-based cationic organic polymer for the efficient removal of TcO4-/ReO4

Huiping Tang; Yujia Kang; Shiquan Cao; Zhi Chen

doi:10.1016/j.jhazmat.2024.133602

Synthesis and performance of guanidinium-based cationic organic polymer for the efficient removal of TcO₄^-/ReO₄

J Hazard Mater. 2024 Mar 15:466:133602. doi: 10.1016/j.jhazmat.2024.133602. Epub 2024 Jan 24.

Authors

Huiping Tang¹, Yujia Kang¹, Shiquan Cao¹, Zhi Chen²

Affiliations

¹ School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026, China.
² School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026, China; State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China. Electronic address: zchen@ustc.edu.cn.

PMID: 38286051
DOI: 10.1016/j.jhazmat.2024.133602

Abstract

Cationic organic polymers have found relatively extensive utility for TcO₄^-/ReO₄^- removal, but the harsh preparation conditions constrain their practical application. The bifunctional guanidinium-based cationic organic polymer (GBCOP) was successfully and facilely synthesized in benign conditions within 1 h. Batch experiments showed that GBCOP exhibited rapid removal kinetics (1 min, >98.0%) and a substantial removal capacity of 536.8 mg/g for ReO₄^-. Even in 1000-fold co-existing NO₃^- anions, the removal efficiency of GBCOP for ReO₄^- was 74.0%^, indicating its good selectivity. Moreover, GBCOP had high removal efficiencies for ReO₄^- across a wide pH (3.0-10.0) range and presented remarkable stability under the conditions of strong acid and base. GBCOP could be reused four times while removing 80.8% ReO₄^- from simulated Hanford wastewater. SEM and XPS results revealed that the mechanism of ReO₄^- removal involved Cl^- ion exchange within the channels of GBCOP. Theoretical calculation results supported that existing the strong electrostatic interaction between guanidinium and ReO₄^-. This dual^-function GBCOP material is cost-effective and holds significant potential for large-scale preparation, making it a promising solution for TcO₄^- removal from nuclear wastewater.

Keywords: Cationic organic polymer; Guanidinium; Removal; TcO(4)(-)/ReO(4)(-).