Confined self-assembly of S, O co-doped GCN short nanotubes/EG composite towards HMIs electrochemical detection and removal

Jue Wang; Kan Kan; Ping Yu; Yihe Fan; Jiahui Fan; Lin Jiang; Fangjie Qin; Keying Shi

doi:10.1016/j.jhazmat.2023.131345

Confined self-assembly of S, O co-doped GCN short nanotubes/EG composite towards HMIs electrochemical detection and removal

J Hazard Mater. 2023 Jun 15:452:131345. doi: 10.1016/j.jhazmat.2023.131345. Epub 2023 Apr 3.

Authors

Jue Wang¹, Kan Kan², Ping Yu³, Yihe Fan⁴, Jiahui Fan⁴, Lin Jiang⁴, Fangjie Qin⁴, Keying Shi⁵

Affiliations

¹ Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Material Science, Heilongjiang University, Harbin 150080, PR China; Heilongjiang Academy of Sciences, Institute of Advanced Technology, Harbin 150020, PR China.
² Heilongjiang Academy of Sciences, Institute of Advanced Technology, Harbin 150020, PR China. Electronic address: kankan.has@foxmail.com.
³ Heilongjiang Academy of Sciences, Institute of Advanced Technology, Harbin 150020, PR China.
⁴ Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Material Science, Heilongjiang University, Harbin 150080, PR China.
⁵ Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Material Science, Heilongjiang University, Harbin 150080, PR China. Electronic address: shikeying2008@163.com.

PMID: 37027923
DOI: 10.1016/j.jhazmat.2023.131345

Abstract

In this paper, we prepared composites by confining S, O co-doped C₃N₄ short nanotubes (SOT) into the slit holes of expanded graphite (EG). The prepared SOT/EG composites had hierarchical pores. Macroporous and mesoporous were conducive to the permeation of heavy metal ions (HMIs) solution, while microporous were favorable for HMIs capture. In addition, EG had excellent adsorption and conductive properties. By leveraging their synergistic effect, SOT/EG composites could be used for electrochemical detection and removal of HMIs simultaneously. The excellent HMIs electrochemical detection and removal performances were due to the unique 3D microstructure and the increase of active sites such as S and O. When SOT/EG composites were prepared into modified electrodes, the limit of detections (LODs) of Pb²⁺ and Hg²⁺ were 0.038 and 0.051 μg L^-1 for simultaneous detection and 0.045 and 0.057 μg L^-1 for individual detection. When SOT/EG composites were used as adsorbents, the equilibrium adsorption capacity of Pb²⁺ and Hg²⁺ solution of 10 mg L^-1 could reach 228.0 and 313.1 mg g^-1, and the adsorption efficiency was above 90%. Due to the low raw materials cost and simple preparation method, SOT/EG composite is a very promising bifunctional material for HMIs electrochemical detection and removal.

Keywords: Adsorbent; Confined preparation; Electrochemical sensor; Hierarchical pores; S, O co-doped.