Abstract

Natural materials (NMs) are the preferred choice of scientists for metal protection due to their economic viability, zero harmful effects and easy protocols for use. NMs are electrochemically adhered to the metals surface and protect them in violent media. In this work, adsorption properties of Musa Paradisica peels on mild steel (MS) in sulfuric acid solutions are studied. To investigate the effect of maturity of peels on adsorption properties, three extracts have been prepared based on maturity of the peels. The examination of all the extracts have been carried out by UV-visible spectroscopy (UVVS), FTIR spectroscopy (FTIS), weight loss measurements (WLM), open circuit potential (OCP) curves, electrochemical impedance spectroscopy (EIS), Tafel polarization curves (TPC), and linear polarization resistance (LPR). The findings of the work announce that the extracts are rich in biological molecules and provide good protection (TPC: maximum 87%, minimum 72%) to MS against sulfuric acid attack. The adsorption effects on MS surface are also monitored through scanning electron microscopy (SEM) and atomic force microscopy (AFM), which claims that the extracts are adhered on MS and doing inhibition in the acid. Langmuir isotherms are employed to do the comparative investigation of the extracts adsorption on MS, which indicate that the difference in the effectiveness of the extracts are related with their adsorption on MS. Adsorption and adsorption characteristics of the extracts are also studied by Density functional theory (DFT) calculations, which confirm the conclusions of Langmuir isotherms.

摘要

天然材料 (NM) 因其经济可行性、零有害影响和易于使用的协议而成为科学家金属保护的首选。NMs 以电化学方式粘附在金属表面并在剧烈介质中保护它们。在这项工作中，Musa Paradisica的吸附特性对硫酸溶液中低碳钢 (MS) 的剥离进行了研究。为了研究果皮成熟度对吸附性能的影响，根据果皮的成熟度制备了三种提取物。所有提取物的检测均通过紫外-可见光谱 (UVVS)、FTIR 光谱 (FTIS)、失重测量 (WLM)、开路电位 (OCP) 曲线、电化学阻抗谱 (EIS)、Tafel 极化曲线进行(TPC) 和线性极化电阻 (LPR)。研究结果表明，提取物富含生物分子，可为 MS 提供良好的保护（TPC：最高 87%，最低 72%）免受硫酸攻击。还通过扫描电子显微镜 (SEM) 和原子力显微镜 (AFM) 监测 MS 表面的吸附效果，它声称提取物粘附在 MS 上并在酸中进行抑制。采用朗缪尔等温线对提取物在质谱上的吸附进行了比较研究，表明提取物有效性的差异与其在质谱上的吸附有关。还通过密度泛函理论（DFT）计算研究了提取物的吸附和吸附特性，证实了朗缪尔等温线的结论。