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<p>Developing efficient green corrosion inhibitors from sustainable, renewable, and cost-effective materials is a pressing challenge. Solvents impact carbon dot structures, leading to property disparities, yet the mechanism of solvent-induced structure–property modulation in carbon dots remains not deeply understood. Herein, dried dandelion leaves served as carbon, nitrogen, and sulfur sources. Using 1-butyl-3-methylimidazolium bromide (an ionic liquid, IL) and water as solvents, nitrogen- and sulfur-functionalized biomass-derived CDs, namely IL-CDs and CDs, were synthesized. The inhibition performance of IL-CDs and CDs for carbon steel in H<sub>2</sub>SO<sub>4</sub> solution was evaluated by electrochemical measurements and surface characterizations. Both IL-CDs and CDs contained abundant N- and S-functional groups, endowing them with photoluminescence and distinct UV–Vis spectral features. The IL increased the content of pyrrole-like nitrogen and C-SOx group, facilitating the formation of a denser protective film. IL-CDs (~ 38.3&#xa0;nm) showed better inhibition efficiency (75.9%) than CDs (73.1%). Adsorption isotherms and corrosion morphology analyses indicated that the inhibition mechanism of IL-CDs and CDs mainly involved physical and chemical adsorption to form a protective film. Notably, pyrrole-like nitrogen species, through π-complex formation, enabled parallel adsorption onto the steel surface, playing a key role in inhibition. This study presents a green strategy for synthesizing efficient biomass-derived carbon dots with IL assistance, advancing the development of sustainable and effective inhibitors.</p>

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Ionic liquid-assisted biomass-derived N, S-doped carbon dots with enhanced corrosion inhibition

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月2日

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  • Shuyun Cao,
  • Yang Zhao,
  • Yubao Cao,
  • Yongwei Li,
  • Haodong Tan,
  • Hong Wang

摘要

Developing efficient green corrosion inhibitors from sustainable, renewable, and cost-effective materials is a pressing challenge. Solvents impact carbon dot structures, leading to property disparities, yet the mechanism of solvent-induced structure–property modulation in carbon dots remains not deeply understood. Herein, dried dandelion leaves served as carbon, nitrogen, and sulfur sources. Using 1-butyl-3-methylimidazolium bromide (an ionic liquid, IL) and water as solvents, nitrogen- and sulfur-functionalized biomass-derived CDs, namely IL-CDs and CDs, were synthesized. The inhibition performance of IL-CDs and CDs for carbon steel in H2SO4 solution was evaluated by electrochemical measurements and surface characterizations. Both IL-CDs and CDs contained abundant N- and S-functional groups, endowing them with photoluminescence and distinct UV–Vis spectral features. The IL increased the content of pyrrole-like nitrogen and C-SOx group, facilitating the formation of a denser protective film. IL-CDs (~ 38.3 nm) showed better inhibition efficiency (75.9%) than CDs (73.1%). Adsorption isotherms and corrosion morphology analyses indicated that the inhibition mechanism of IL-CDs and CDs mainly involved physical and chemical adsorption to form a protective film. Notably, pyrrole-like nitrogen species, through π-complex formation, enabled parallel adsorption onto the steel surface, playing a key role in inhibition. This study presents a green strategy for synthesizing efficient biomass-derived carbon dots with IL assistance, advancing the development of sustainable and effective inhibitors.