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Constructing the frustrated Lewis pairs within N,S-codoped carbon to reveal the role of adjacent heteroatom sites for highly effective removal of heavy metal ions

Authors
  • Chen, Junwu
  • Yuan, Menglei
  • Cai, Weiquan
  • Wei, Jiahao
  • Zhou, Jinpeng
  • Liu, Pei
  • Yang, Zhichao
  • Luo, Jinlu
  • Xia, Qing
  • Cai, Zhijun
Publication Date
Oct 15, 2021
Source
Institutional Repository of Institute of Process Engineering, CAS (IPE-IR)
Keywords
License
Unknown
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Abstract

Heteroatom doping is a promising strategy for improving adsorption performance of cost-effective carbon materials for heavy-metal ions from wastewater. However, the lack of theoretical research restricts its development. Herein, theoretical simulations successfully predict that the short distance between the N and S sites is a key factor for the N,S-codoped carbon with a higher adsorption capacity than that of the single doping carbon. Inspired by this interesting finding, a low-energy and ultrafast approach is proposed to prepare N,S-codoped carbon within only 10 s from ternary deep eutectic solvents. Benefiting from the unique dual-doped architecture, the adsorption capacity of the N,S-codoped carbon for Cr(VI) is significantly enhanced to 564.7 mg/g in comparison with single doped carbon (396.2 mg/g) and pristine carbon (186.4 mg/g). The further calculations of energy and electronic structure reveal that adjacent -NH3+ and -SO2- groups can generate frustrated Lewis pairs (FLPs). Such FLP-type sites can promote the adsorption and reduction of Cr(VI) ions due to enhanced electron transfer between functional groups and Cr(VI) ions. This work provides an in-depth comprehension and guidance for synthesis of heteroatom-codoped carbon-based materials with excellent separation performance for heavy metal ions.

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