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<p>Developing efficient green inhibitors from sustainable and cost-effective materials remains a challenge. Nitrogen (N) and sulfur (S) co-doped carbon dots (CDs) were synthesized from dried lycium as carbon, nitrogen, and sulfur sources, using hydrothermal reaction. The corrosion inhibition performance of these CDs on carbon steel in 1&#xa0;M HCl solution was investigated using electrochemical measurements and surface characterizations techniques. The lycium-derived CDs, were rich in oxygen-, nitrogen-, and sulfur-containing functional groups, had an average size of ~ 20.3&#xa0;nm and a pyrrole-like N content of 65.3%. These characteristics contributed to their effective inhibition performance, achieving a maximum inhibition efficiency of 88.4% for carbon steel at a concentration of 100&#xa0;mg/L. Adsorption isotherm and corrosion morphology analyses indicated that the inhibition mechanism of CDs primarily involves the formation of a protective film through both physical and chemical adsorption. Pyrrole-like N species, via π-complex formation, play a significant role in achieving excellent inhibition by promoting parallel adsorption onto the steel surface. This study demonstrates a green approach for synthesizing efficient biomass-derived CDs, promoting the development of sustainable and effective corrosion protection strategies.</p>

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Biomass derived nitrogen and sulfur codoped carbon dots as efficient corrosion inhibitors for carbon steel in acidic environment

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月6日

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  • Shuyun Cao,
  • Yubao Cao,
  • Yongwei Li,
  • Hong Wang

摘要

Developing efficient green inhibitors from sustainable and cost-effective materials remains a challenge. Nitrogen (N) and sulfur (S) co-doped carbon dots (CDs) were synthesized from dried lycium as carbon, nitrogen, and sulfur sources, using hydrothermal reaction. The corrosion inhibition performance of these CDs on carbon steel in 1 M HCl solution was investigated using electrochemical measurements and surface characterizations techniques. The lycium-derived CDs, were rich in oxygen-, nitrogen-, and sulfur-containing functional groups, had an average size of ~ 20.3 nm and a pyrrole-like N content of 65.3%. These characteristics contributed to their effective inhibition performance, achieving a maximum inhibition efficiency of 88.4% for carbon steel at a concentration of 100 mg/L. Adsorption isotherm and corrosion morphology analyses indicated that the inhibition mechanism of CDs primarily involves the formation of a protective film through both physical and chemical adsorption. Pyrrole-like N species, via π-complex formation, play a significant role in achieving excellent inhibition by promoting parallel adsorption onto the steel surface. This study demonstrates a green approach for synthesizing efficient biomass-derived CDs, promoting the development of sustainable and effective corrosion protection strategies.