In the present study, the silver/halloysite nanotube/molybdenum disulfide (Ag/HNT/MoS₂) nanocomposite was successfully synthesized. For this purpose, the lumen of HNTs was firstly modified by silver to generate Ag nanorods via chemical process and then the MoS₂ layers deposited on the Ag/HNT nanocomposite by hydrothermal method. The characterization of Ag/HNT/MoS₂ nanocomposite were investigated by field emission scanning electron microscopy (FE-SEM), Fourier transform infrared (FT-IR) spectroscopy, transmission electron microscopy (TEM), X-ray photoelectron spectra (XPS), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) analyses. The nanocomposite modified carbon paste electrode (CPE) was applied for the electrocatalytic detection of nitrite in aqueous solutions. It was demonstrated that the treatment of HNTs with Ag and MoS₂ materials enhanced the catalytic performance of modified CPE. At optimal experimental conditions, the designed sensor displayed remarkable sensing ability toward nitrite oxidation, offering a good linearity from 2 to 425 µM. The limit of detection (LOD) of the proposed strategy was estimated to be 0.7 µM based S/N = 3. The good reproducibility, acceptable stability, fast response time and anti-interference performance of the proposed assay suggests that the modified CPE has great potential working as a nitrite electrochemical sensor for environmental applications.

在本研究中，成功地合成了银/卤化物纳米管/二硫化钼（Ag / HNT / MoS ₂）纳米复合材料。为此，首先对HNTs的管腔进行银修饰，以化学方法生成Ag纳米棒，然后通过水热法将MoS ₂层沉积在Ag / HNT纳米复合材料上。Ag / HNT / MoS ₂的表征纳米复合材料通过场发射扫描电子显微镜（FE-SEM），傅立叶变换红外（FT-IR）光谱，透射电子显微镜（TEM），X射线光电子能谱（XPS），能量色散X射线能谱（EDS）进行了研究和X射线衍射（XRD）分析。纳米复合修饰碳糊电极（CPE）用于水溶液中亚硝酸盐的电催化检测。结果表明，用Ag和MoS ₂处理HNTs材料增强了改性CPE的催化性能。在最佳实验条件下，设计的传感器对亚硝酸盐的氧化显示出非凡的感测能力，具有2至425 µM的良好线性。拟议策略的检测限（LOD）估计为0.7 µM（基于S / N = 3）。良好的重现性，可接受的稳定性，快速的响应时间和抗干扰性能表明拟议的CPE具有很好的检测性能。电位可作为亚硝酸盐电化学传感器用于环境应用。