During environmental testing, it is an urgent problem for scientists to develop and design a new type of electrochemical sensor electrode with distinguished stability, high activity and cost-effectiveness. In our research, a novel and simple electroanalytical method for the simultaneous determination of acetaminophen (AC) and levofloxacin (LEV) in environmental water was proposed based on an ultrathin graphitic carbon nitride nanosheet-doped graphene oxide (CNNS/GO). The physicochemical properties of as-synthesized nanocomposite materials were characterized in detail by various spectroscopic and analytical techniques. Meanwhile, the electrochemical characterisation of the modified GCE was carried out by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and differential pulse voltammetry (DPV). The CNNS/GO electrochemical ultra-sensitive strategy was established for detecting AC and LEV in linear concentration ranges of 5 × 10⁻⁷–3.0 × 10⁻⁵ and 5 × 10⁻⁷–1.5 × 10⁻⁵ mol L⁻¹ with low detection limits of 1.7 × 10⁻⁸ and 7.9 × 10⁻⁸ mol L⁻¹ toward AC and LEV, respectively. The sensor was provided with lower cost, excellent accuracy, satisfactory sensitivity and simple fabrication. The fabricated electrochemical sensor was further successfully expanded to determine AC and LEV in river water samples with recoveries between 95.6% and 111.8% and good correspondence with the HPLC method.

中文翻译：

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基于g-C3N4纳米片掺杂氧化石墨烯的电化学同时检测水中对乙酰氨基酚和左氧氟沙星的策略

在环境测试过程中，科学家们迫切需要开发和设计一种新型的电化学传感器电极，该电极具有出色的稳定性，高活性和成本效益。在我们的研究中，基于超薄石墨氮化碳纳米片掺杂氧化石墨烯（CNNS / GO），提出了一种新颖，简单的电分析方法，用于同时测定环境水中的对乙酰氨基酚（AC）和左氧氟沙星（LEV）。合成的纳米复合材料的物理化学性质通过各种光谱和分析技术进行了详细描述。同时，通过循环伏安法（CV），电化学阻抗谱法（EIS）和微分脉冲伏安法（DPV）进行了修饰的GCE的电化学表征。⁻⁷ –3.0×10 ^-5和5×10 ^-7 –1.5×10 ^-5 mol L ^-1，对AC和LEV的低检测限分别为1.7×10 ^-8和7.9×10 ^-8 mol L ^-1。该传感器具有较低的成本，优异的精度，令人满意的灵敏度和简单的制造。所制造的电化学传感器进一步成功地扩展了测定河水中样品中AC和LEV的方法，回收率在95.6％和111.8％之间，与HPLC方法具有很好的对应性。