One of the main limitations for large scale mass production of reduced graphene oxide is the application of some toxic and hazardous reducing agents such as hydrazine and borohydride. In this study, the effectiveness of the l-Cys (HSCH2CH(NH2)CO2H) molecules, as a green amino acid in the GO reduction, as well as its active corrosion inhibition capacity were explored. The l-Cys/GO nanosheets were then modified by trivalent-cerium ions to obtain a nanocarrier with excellent controlled release activity. The electrochemical impedance spectroscopy (EIS) and polarization tests were used to measure the smart corrosion inhibition activity of the cerium modified l-Cys/GO nanocarrier in the saline solution and epoxy coating. The results showed that the cerium ions adsorption on the l-Cys/GO nanosheets obeyed a Langmuir isotherm model. The l-Cys/GO sample showed cerium ions adsorption capacity about 66% higher than the unmodified GO nanosheets. Furthermore, the EIS tests results revealed that in the presence of cerium modified l-Cys/GO nanocarriers the improvement in the corrosion resistance of bare steel in the solution phase and coated sample was about 7.5 times (after 24 h) and 950 times (after 40 days) higher than the blank saline solution and the pure epoxy sample, respectively.

中文翻译：

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L-半胱氨酸还原/官能化的氧化石墨烯作为可持续铈离子的智能/控释纳米载体的应用，可改善环氧涂料的防腐性能。

大规模大量生产还原的氧化石墨烯的主要限制之一是某些有毒有害的还原剂的应用，例如肼和硼氢化物。在这项研究中，L-Cys（HSCH2CH（NH2）CO2H）分子作为GO还原中的绿色氨基酸的有效性及其有效的腐蚀抑制能力得到了研究。然后，通过三价铈离子修饰l-Cys / GO纳米片，以获得具有优异控释活性的纳米载体。电化学阻抗谱（EIS）和极化测试用于测量盐溶液和环氧涂层中铈改性的L-Cys / GO纳米载体的智能缓蚀活性。结果表明，铈离子在l-Cys / GO纳米片上的吸附遵循Langmuir等温模型。l-Cys / GO样品显示铈离子的吸附能力比未修饰的GO纳米片高约66％。此外，EIS测试结果表明，在铈改性的l-Cys / GO纳米载体存在下，溶液相和涂层样品中裸钢的耐蚀性提高了约7.5倍（24小时后）和950倍（后40天）分别高于空白盐溶液和纯环氧样品。