Nunes Rayani da Silva, Magno Paiva Victor, de Oliveira Sanair Massafra, da Silva de Almeida Clara Muniz, de Oliveira Mariane Silva, de Araujo Joyce Rodrigues, Archanjo Bráulio Soares, Suguihiro Natasha Midori, D'Elia Eliane
Department of Inorganic Chemistry, Universidade Federal do Rio de Janeiro UFRJ, Avenida Athos da Silveira Ramos, 149, Cidade Universitária, 21941-909 Rio de Janeiro, Brazil.
Materials Metrology Division, Instituto Nacional de Metrologia, Qualidade e Tecnologia INMETRO, Avenida Nossa Sra. das Graças, 50, Xerém, 25250-020 Duque de Caxias, Brazil.
ACS Omega. 2024 Dec 12;9(51):50246-50259. doi: 10.1021/acsomega.4c05908. eCollection 2024 Dec 24.
This work reports the obtention of Si,N,S-CQDs from sugar cane bagasse and their inhibitory action on the mild steel corrosion in 1 mol L HCl solution. The CQDs were successfully obtained and characterized by X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy, Dynamic light scattering, Raman, and UV-vis techniques, also showing endogenous self-doping. The anti-corrosive activity of CQDs was investigated by gravimetric tests, potentiodynamic polarization curves, electrochemical impedance measurements, atomic force microscopy, and scanning electron microscopy. The electrochemical results show that the CQDs present a predominant inhibitory action on the cathodic process, presenting inhibition efficiency of 82, 89, 91, and 94% for 15, 25, 50, and 100 ppm, respectively. Gravimetric tests varying temperature demonstrate that the inhibitor functions through physical adsorption and remains effective for up to 72 h, exhibiting corrosion efficiency of 80.2, 93.2, 96.3, and 97.8% at 15, 25, 50, and 100 ppm concentrations, respectively, after 72 h of immersion. Dynamic light scattering and zeta potential measurements indicate that agglomerations of CQDs play a crucial role in inhibiting corrosion. These results show an excellent alternative for using sugar cane bagasse to produce CQDs and its application as a corrosion inhibitor, valuing agricultural waste and simultaneously solving industry problems.
本工作报道了从甘蔗渣中获得硅氮硫共掺杂碳量子点（Si,N,S-CQDs）及其对1 mol/L HCl溶液中低碳钢腐蚀的抑制作用。通过X射线光电子能谱、傅里叶变换红外光谱、动态光散射、拉曼光谱和紫外可见光谱技术成功获得并表征了碳量子点，其还表现出内源性自掺杂特性。通过重量法测试、动电位极化曲线、电化学阻抗测量、原子力显微镜和扫描电子显微镜研究了碳量子点的抗腐蚀活性。电化学结果表明，碳量子点对阴极过程具有主要抑制作用，对于15、25、50和100 ppm的碳量子点，其抑制效率分别为82%、89%、91%和94%。不同温度下的重量法测试表明，该缓蚀剂通过物理吸附起作用，并且在长达72小时内保持有效，浸泡72小时后，在15、25、50和100 ppm浓度下的腐蚀效率分别为80.2%、93.2%、96.3%和97.8%。动态光散射和zeta电位测量表明，碳量子点的团聚在抑制腐蚀中起关键作用。这些结果表明，利用甘蔗渣生产碳量子点并将其用作缓蚀剂是一种极佳的选择，既重视了农业废弃物，又同时解决了工业问题。
