在这里,开发了一种包含离子印迹电纺纳米纤维的高效比色化学传感器,用于去除和检测Cu2离子。在这方面,以PVA/壳聚糖复合材料为聚合物基体,1-(2-吡啶基偶氮)-2-萘酚用于络合物形成。利用傅里叶变换红外光谱对制备的裸眼传感器进行了表征,能量色散X射线光谱,扫描电子显微镜,原子力显微镜,差示扫描量热法,热重分析,和X射线衍射分析,揭示了形态学,结构,和传感器的分子特性。结果表明,与干扰离子相比,基于铜印迹纳米纤维(Cu-INF)的比色化学传感器对Cu2具有更高的选择性。选择性系数(k)和相对选择性系数(K')表明Cu-INF在Cu2+/Co2+二元体系中吸附Cu2+的选择性行为,Cu2+/Ni2+,和Cu2+/Zn2+。此外,离子印迹纳米纤维用于铜离子的预浓缩,对Cu2+的吸附容量为128.205mgg-1。Cu2+在Cu-INF上的平衡吸附等温线和吸附动力学遵循Freundlich吸附等温线和拟二级模型,分别。开发的传感器对铜离子的线性检测范围为5×10-8-2×10-7M,检测限(LOD)为1.07×10-8M。结果表明,在痕量浓度下,Cu2的吸附效果良好,检测成功。
Herein, a highly efficient colorimetric chemosensor incorporating ion-imprinted electrospun
nanofiber was developed for the removal and detection of Cu2+ ions. In this regard, PVA/chitosan composites were used as the polymeric matrix, and 1-(2-pyridylazo)-2-naphthol was employed for complex formation. The prepared naked-eye sensor was characterized using Fourier transform infrared spectroscopy, energy-dispersive X-ray spectroscopy, scanning electron microscopy, atomic force microscopy, differential scanning calorimetry, thermogravimetric analysis, and X-ray diffraction analysis, revealing the morphological, structural, and molecular properties of the sensor. The results showed that the colorimetric chemosensor based on copper-imprinted
nanofiber (Cu-INF) possesses higher selectivity for Cu2+ compared to interference ions. The selectivity coefficient (k) and relative selectivity coefficient (K\') indicated the selective behavior of Cu-INF in the adsorption of Cu2+ in binary systems including Cu2+/Co2+, Cu2+/Ni2+, and Cu2+/Zn2+. Furthermore, the ion-imprinted
nanofiber was used for the preconcentration of copper ions, demonstrating a high adsorption capacity of 128.205 mg g-1 for Cu2+. The equilibrium adsorption isotherm and adsorption kinetics of Cu2+ on Cu-INF followed the Freundlich adsorption isotherm and a pseudo-second-order model, respectively. The developed sensor exhibited a linear detection range of 5 × 10-8 - 2 × 10-7 M with a limit of detection (LOD) of 1.07 × 10-8 M for copper ions. The results indicated satisfactory adsorption and successful detection of Cu2+ at trace concentrations.