Abstract

An electrochemical sensor for hydrogen peroxide (H₂O₂) present in face bleach cream is fabricated using a composite based on bentonite (Bt) clay and copper oxide (CuO) nanoparticles (CuO-Bt). The CuO nanoparticles’ immobilization into Bt was carried out by a two-step process in which Cu²⁺ is ion-exchanged into Bt layers (Cu²⁺-Bt) in the first step followed by the chemical reaction of NaOH with Cu²⁺-Bt in the second step to get the target material, CuO nanoparticles immobilized Bt (CuO-Bt). The successful immobilization of CuO nanoparticles into Bt is investigated by a variety of techniques like scanning electron microscopy, transmission electron microscopy, FT-IR spectroscopy, UV-Vis spectroscopy, and electrochemical methods. The CuO-Bt composite is coated on a glassy carbon electrode and used as a selective electrochemical sensing platform for the determination of H₂O₂ based on the significant electrocatalytic property of CuO-Bt towards the H₂O₂ oxidation. This amperometric electrochemical sensor shows two linear detection ranges (5–50 μM and 50–10000 μM) with a limit of detection of 4.9 μM. The sensitivity is calculated to be 0.06 µA µM⁻¹ cm⁻². This electrochemical sensor exhibits high selectivity, stability, and practical applicability for the H₂O₂ determination in real samples.

Graphic Abstract

Schematic presentation of copper oxide immobilized clay nano architectures as an efficient electrochemical sensing platform for practical applicability of the H²O² determination in face bleach cream.

中文翻译：

---

氧化铜固定化粘土纳米结构作为过氧化氢的有效电化学传感平台

摘要

使用基于膨润土（Bt）粘土和氧化铜（CuO）纳米粒子（CuO-Bt）的复合材料制造面霜中存在的过氧化氢（H ₂ O ₂）电化学传感器。通过两步过程将CuO纳米颗粒固定在Bt中，第一步是将Cu ²⁺离子交换成Bt层（Cu ²⁺ -Bt），然后进行NaOH与Cu ²⁺的化学反应。-Bt在第二步中获得目标材料，将CuO纳米粒子固定化Bt（CuO-Bt）。通过多种技术，例如扫描电子显微镜，透射电子显微镜，FT-IR光谱，UV-Vis光谱和电化学方法，研究了将CuO纳米颗粒成功固定在Bt中的方法。CuO的转Bt基因复合物涂布在玻碳电极，并用作选择性电化学感测平台H的判定₂ Ò ₂基于朝向为H的CuO-Bt基因的显著电属性₂ ö ₂氧化。该电流型电化学传感器显示两个线性检测范围（5-50μM和50-10000μM），检测极限为4.9μM。计算出的灵敏度为0.06 µA µM ^-1  cm ^-2。该电化学传感器对实际样品中的H ₂ O ₂测定具有很高的选择性，稳定性和实用性。

图形摘要

氧化铜固定粘土纳米结构的示意图，作为一种有效的电化学传感平台，可用于在面霜中测定H ² O ^2的实际适用性。