School of Public Health, Hengyang Medical School, University of South China, Hengyang, Hunan 421001, PR China; Engineering Research Center of Loss Efficacy and Anticorrosion of Materials of Guizhou, School of Chemistry and Chemical Engineering, Qiannan Normal University for Nationalities, Duyun, Guizhou 558000, PR China; State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan 410082, PR China.
School of Public Health, Hengyang Medical School, University of South China, Hengyang, Hunan 421001, PR China; State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan 410082, PR China.
Int J Biol Macromol. 2023 Dec 31;253(Pt 2):126449. doi: 10.1016/j.ijbiomac.2023.126449. Epub 2023 Aug 24.
Polysaccharide chitosan and L-histidine were applied to synthesize chitosan-based carbon dots (CA-CDs) by a simple laser ablation method. After characterization of the CA-CDs by FT-IR, UV-vis, Raman, XRD, TEM, and XPS, the CA-CDs were introduced as an eco-friendly and high-performance corrosion inhibitor for mild steel (MS) in 1.0 M HCl solution. The inhibition action and mechanism of CA-CDs were determined by weight loss and electrochemical measurements, in combination with SEM, AFM, and XPS. The results show that CA-CDs as mixed-type inhibitors could effectively weaken the corrosion of MS in 1.0 M HCl solution, and their maximum inhibition efficiency reaches 97.4 % at 40 mg L. The adsorption behavior of CA-CDs well obeys the Langmuir adsorption isotherm containing both chemisorption and physisorption. The chemisorption mainly results from the multiple adsorption sites in the CA-CDs, and the physical adsorption is due to the blocking and barrier effect of CA-CD nanoparticles. Both adsorption behaviors were proposed to elucidate the corrosion inhibition mechanism of CA-CDs.
壳聚糖和 L-组氨酸被应用于通过简单的激光烧蚀法合成壳聚糖基碳点（CA-CDs）。通过傅里叶变换红外光谱（FT-IR）、紫外可见光谱（UV-vis）、拉曼光谱（Raman）、X 射线衍射（XRD）、透射电子显微镜（TEM）和 X 射线光电子能谱（XPS）对 CA-CDs 进行了表征后，将 CA-CDs 作为一种环保且高性能的缓蚀剂，用于在 1.0 M HCl 溶液中保护低碳钢（MS）。通过失重和电化学测量，并结合 SEM、AFM 和 XPS，确定了 CA-CDs 的缓蚀作用和机制。结果表明，CA-CDs 作为混合型抑制剂可以有效减弱 MS 在 1.0 M HCl 溶液中的腐蚀，其最大抑制效率在 40 mg·L 时达到 97.4%。CA-CDs 的吸附行为很好地符合 Langmuir 吸附等温线，其中包含化学吸附和物理吸附。化学吸附主要归因于 CA-CDs 中的多个吸附位点，而物理吸附则是由于 CA-CD 纳米颗粒的阻塞和阻挡效应。这两种吸附行为都被用来阐明 CA-CDs 的缓蚀机制。
