Green synthesis of in-situ S-doped graphyne for Hg(II) adsorption and energy storage from efficient mechanochemical reaction of calcium carbide and tetrabromothiophene

• Published in: Separation and purification technology 2025-01, Vol.353, p.128596, Article 128596
• Main Authors: Li, Yingjie, Wang, Xiaoyu, Xu, Shenao, Qiang, Bo, Shi, Wenxu, Gu, Jing, Yu, Moxin, Li, Chunxi
• Format: Article
• Language: English
• Subjects: CaC2; Hg(II) adsorption; In-situ S-doped graphyne; Mechanochemistry; Supercapacitor
• ISSN: 1383-5866
• DOI: 10.1016/j.seppur.2024.128596

[Display omitted] •Functional in-situ S-doped graphyne was bottom-up synthesized through a solvent-free mechanochemical strategy.•The mechanochemical reactions between calcium carbide and tetrabromothiophene is efficient, green and controllable.•The resultant S-doped graphyne features unique composition and structure with alkynyl-linked thienyl carbon skeleton.•The resultant S-doped graphyne exhibits high application performance in Hg(II) adsorption and energy storage.•This work provides an innovative perspective for the structure expansion and application development of graphynes. Two-dimensional alkynyl carbon materials have great application prospects, and the in situ doping can further regulate their performance and structure–property relation. However, the “bottom-up” synthesis strategy of doped graphyne for energy and environmental fields is rarely studied. In this work, a S-doped graphyne (S-GY) was successfully synthesized through solvent-free mechanochemical reaction of calcium carbide and tetrabromothiophene. The synthesis process is efficient, green and controllable. The resultant S-GY possesses unique composition and alkynyl-linked thienyl carbon skeleton with hierarchical porosity, in-situ S doping, nanosheet morphology and well-ordered internal structure. Further, the S-GY exhibits excellent Hg(II) adsorptivity of 869.6 mg g−1, and supercapacity performance with good electrical conductivity, excellent long cycle stability and high specific capacitance (415.6 F cm−3). The proposed strategy is helpful to promote the structural expansion of graphynes, boost the application of two-dimensional alkynyl carbon materials, and thus may provides a new perspective for the development of novel carbon materials.