AbstractThe authors describe a modified glassy carbon electrode (GCE) for the amperometric determination of cyanide ions. First, the surface of TiO2 nanoparticles was modified with aminopropyltriethoxysilane (AS). These were then deposited, along with graphene oxide (GO) nanosheets, on the surface of the GCE. The modification steps were followed by reductive deposition of reduced 4-nitrophenol (rNPh). The GO/TiO2-AS-rNPh electrode was used to design a photoelectrochemical amperometric cyanide assay which works in pH 7 solution, best at 0.35 V (vs. Ag/AgCl). Characteristics of merit include a 0.1 μM detection limit, a 165.5 nA·nM−1·cm−2 sensitivity, and a dynamic linear range extending from 0.1 μM to 60 μM. The selectivity of the assay was tested by recording the response of the modified GCE to potentially interfering anions and was found to be very good. The inherent photocatalytic activity, good stability, wide linear analytical range, short response time, low detection limit and good selectivity make this assay highly advantageous Graphical abstractSchematic presentation of prepared nanocomposite made from graphene oxide and modified titanium oxide nanoparticles. The titanium oxide nanoparticles were modified by using aminopropyltriethoxysilane (AS) and nitrophenol (NPh). The GO/TiO2-AS-rNPh was applied to sensing the cyanide ion. The mechanisms of charge transfer and photocatalysis are also illustrated.

中文翻译：

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使用氧化石墨烯和二氧化钛纳米粒子修饰的玻璃碳电极对氰化物进行光电化学电流检测

摘要作者描述了一种用于安培法测定氰化物离子的改良玻璃碳电极 (GCE)。首先，用氨基丙基三乙氧基硅烷 (AS) 改性 TiO2 纳米颗粒的表面。然后将它们与氧化石墨烯 (GO) 纳米片一起沉积在 GCE 的表面上。改性步骤之后是还原的 4-硝基苯酚 (rNPh) 的还原沉积。GO/TiO2-AS-rNPh 电极用于设计一种光电化学安培氰化物测定，该测定在 pH 7 溶液中工作，最佳电压为 0.35 V（相对于 Ag/AgCl）。优点包括 0.1 μM 检测限、165.5 nA·nM-1·cm-2 灵敏度和从 0.1 μM 扩展到 60 μM 的动态线性范围。通过记录修饰的 GCE 对潜在干扰阴离子的响应来测试该测定的选择性，发现非常好。固有的光催化活性、良好的稳定性、宽的线性分析范围、短的响应时间、低的检测限和良好的选择性使该测定非常有利。通过使用氨基丙基三乙氧基硅烷（AS）和硝基苯酚（NPh）对氧化钛纳米粒子进行改性。GO/TiO2-AS-rNPh 用于检测氰化物离子。还说明了电荷转移和光催化的机制。低检测限和良好的选择性使该测定非常有利图​​形摘要由氧化石墨烯和改性氧化钛纳米粒子制成的制备纳米复合材料的示意图。通过使用氨基丙基三乙氧基硅烷（AS）和硝基苯酚（NPh）对氧化钛纳米粒子进行改性。GO/TiO2-AS-rNPh 用于检测氰化物离子。还说明了电荷转移和光催化的机制。低检测限和良好的选择性使该测定非常有利图​​形摘要由氧化石墨烯和改性氧化钛纳米粒子制成的制备纳米复合材料的示意图。通过使用氨基丙基三乙氧基硅烷（AS）和硝基苯酚（NPh）对氧化钛纳米粒子进行改性。GO/TiO2-AS-rNPh 用于检测氰化物离子。还说明了电荷转移和光催化的机制。