Yang Mengyao, Wu Zhigang, Wang Xixin, Yin Zekun, Tan Xu, Zhao Jianling
School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300130, China.
School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300130, China.
Talanta. 2022 Jul 1;244:123407. doi: 10.1016/j.talanta.2022.123407. Epub 2022 Mar 26.
The MnO-TNTA composite electrodes were obtained through depositing MnO into TiO nanotube arrays (TNTA) by successive ionic layer adsorption reaction (SILAR) and subsequent hydrothermal method. The MnO-TNTA nanocomposites were used as electrochemical sensors for the detection of hydrogen peroxide (HO). The preparation conditions of MnO-TNTA electrodes and test conditions affect the electrochemical detection performance significantly. The optimal conditions are listed as follows: the number of SILAR cycles, 6 times; KMnO solution temperature, 50 °C; supporting electrolyte, 0.5 M NaOH. Under these conditions, the MnO-TNTA electrode exhibits the best performance for detecting HO. The optimized MnO-TNTA electrode has a minimum detection limit of 0.6 μM (S/N = 3) and a linear range of 5 μM ∼ 13 mM, which is much superior to the previously-reported electrodes. Moreover, the optimized MnO-TNTA electrode possesses high selectivity, excellent stability and good reproducibility in the detection of HO. When used in the determination of HO content in actual samples including disinfectant and milk, it also shows good accuracy, ideal recovery (96.00% ∼ 102.67%) and high precision (RSD < 4.0%).
通过连续离子层吸附反应（SILAR）并随后采用水热法将MnO沉积到TiO纳米管阵列（TNTA）中，制备得到MnO-TNTA复合电极。MnO-TNTA纳米复合材料用作检测过氧化氢（H₂O₂）的电化学传感器。MnO-TNTA电极的制备条件和测试条件对电化学检测性能有显著影响。最佳条件如下：SILAR循环次数为6次；KMnO₄溶液温度为50℃；支持电解质为0.5 M NaOH。在这些条件下，MnO-TNTA电极在检测H₂O₂时表现出最佳性能。优化后的MnO-TNTA电极的最低检测限为0.6 μM（S/N = 3），线性范围为5 μM ∼ 13 mM，远优于先前报道的电极。此外，优化后的MnO-TNTA电极在检测H₂O₂时具有高选择性、优异的稳定性和良好的重现性。当用于测定包括消毒剂和牛奶在内的实际样品中的H₂O₂含量时，它还显示出良好的准确性、理想的回收率（96.00% ∼ 102.67%）和高精度（RSD < 4.0%）。
