In the present work, we have prepared an ecofriendly reduced graphene oxide decorated copper(II) ethylenediamine complex ([Cu(en)₂]²⁺) (en = ethylenediamine) modified glassy carbon electrode (GCE) for the electrochemical detection of hydroquinone (HQ). The as-prepared composite was characterized by SEM, EDX, XRD, UV and FT-IR. Moreover, the electrochemical behaviour of the modified electrode was investigated by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and differential pulse voltammetry (DPV). In addition, the GCE/RGO/[Cu(en)₂]²⁺ modified electrode has excellent electrocatalytic activity towards the detection of HQ. Under the optimized conditions, the proposed sensor exhibited a wide linear detection response range of 0.1 μM–104 μM with a limit of detection of 0.025 μM and a sensitivity of 5.0763 μA μM⁻¹ cm⁻². Furthermore, the fabricated electrode exhibited acceptable reproducibility, repeatability and stability. On the other hand, the GCE/RGO/[Cu(en)₂]²⁺ modified electrodes have been applied for the real sample analysis in environmental water samples, which exhibit acceptable recovery. Hence, it is suggested that the GCE/RGO/[Cu(en)₂]²⁺ modified electrode is a potential electrode material that can be used for the detection of HQ in different real samples.

中文翻译：

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用乙二胺铜（ii）复合复合修饰电极修饰的石墨烯片的环保制备，用于选择性检测水中的对苯二酚†

在目前的工作中，我们制备了一种环保型的还原氧化石墨烯修饰的铜（II）乙二胺络合物（[Cu（en）₂ ] ₂ ⁺）（en =乙二胺）修饰的玻碳电极（GCE），用于电化学检测对苯二酚（总部）。制备的复合材料通过SEM，EDX，XRD，UV和FT-IR表征。此外，通过循环伏安法（CV），电化学阻抗谱（EIS）和差动脉冲伏安法（DPV）研究了修饰电极的电化学行为。此外，GCE / RGO / [Cu（en）₂ ] ²⁺修饰电极对HQ的检测具有出色的电催化活性。在优化的条件下，拟议的传感器表现出0.1 μM–104μM的宽线性检测响应范围，检测极限为0.025μM，灵敏度为5.0763μAμM ^-1 cm ^-2。此外，所制造的电极表现出可接受的再现性，可重复性和稳定性。另一方面，GCE / RGO / [Cu（en）₂ ] ²⁺修饰电极已用于环境水样品中的实际样品分析，其回收率令人满意。因此，建议GCE / RGO / [Cu（en）₂ ] ²⁺ 修饰电极是一种潜在的电极材料，可用于检测不同真实样品中的HQ。