Dayra Hager A, Abdelaal Magdy Y, Khalifa Magdi E, Abdallah A B
Chemistry Department, Faculty of Science, Mansoura University, Mansoura, 35516, Egypt.
Chemistry Department, Faculty of Science, New Mansoura University, New Mansoura City, Egypt.
Sci Rep. 2024 Nov 2;14(1):26400. doi: 10.1038/s41598-024-76571-y.
Owing to the high cost and unavailability of different analytical techniques, there is an urgent need to develop new techniques not only for detecting but also removing mercury ions in real samples. Thus, an optical chemical sensor based on the anchoring of phenanthraquinone monophenylthiosemicarbazone in a plasticized cellulose triacetate membrane was fabricated and applied to the recognition and removal of mercury ions from aqueous solutions. The synthesized optode was characterized by FT-IR, SEM, AFM, and thermal analysis. Several parameters, including the pH, temperature, contact time, washing solvent, and washing time, were optimized. Under optimal conditions, a promising optode film platform was utilized for sensing mercury ions, and the concentrations were calculated based on colorimetric analysis (Histogram, RGB) of digital images, visualization, and spectrophotometry. Also, an optical optode was used for complete adsorption of mercury ions from aqueous solutions. In addition, the regeneration of the synthesized optode was evaluated using 0.1 mol L nitric acid, which effectively removed all adsorbed mercury ions. The obtained data indicated good linearity in the sensing and adsorption of Hg over a concentration range of 0.005-5000 µgL with a low limit of detection (LOD = 0.066 µgL) and limit of quantification (LOQ, 0.22 µgL). Furthermore, it showed good distinctions in the presence of coexisting ions, high stability (five months), good applicability, and reproducibility (RSD = 1.31%), making it a promising sensor for Hg detection. On the other hand, the kinetic studies revealed that the pseudo-second-order was the best model for describing the adsorption behavior of mercury ions on the optode surface. Also, the thermodynamic parameters indicate spontaneous (ΔG < 0) and endothermic (ΔH < 0) reactions. Also, the maximum adsorption capacity was found to be 73.2 mg g. Thus, the optodes were successfully applied for the detection and/or removal of Hg in different real samples, including cucumber, fish, soil, and water samples, with excellent recoveries of 98.1-99.5%.
由于不同分析技术成本高昂且难以获得，迫切需要开发新技术，不仅用于检测，还用于去除实际样品中的汞离子。因此，制备了一种基于将菲醌单苯基硫代半卡巴腙锚定在增塑三醋酸纤维素膜中的光学化学传感器，并将其应用于识别和去除水溶液中的汞离子。通过傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）、原子力显微镜（AFM）和热分析对合成的光极进行了表征。对包括pH值、温度、接触时间、洗涤溶剂和洗涤时间在内的几个参数进行了优化。在最佳条件下，利用一个有前景的光极膜平台传感汞离子，并基于数字图像的比色分析（直方图、RGB）、可视化和分光光度法计算浓度。此外，使用光学光极从水溶液中完全吸附汞离子。另外，使用0.1 mol/L硝酸评估了合成光极的再生情况，其有效地去除了所有吸附的汞离子。获得的数据表明，在0.005 - 5000 μg/L的浓度范围内，汞的传感和吸附具有良好的线性，检测限低（LOD = 0.066 μg/L）和定量限（LOQ，0.22 μg/L）。此外，在共存离子存在的情况下它表现出良好的区分能力、高稳定性（五个月）、良好的适用性和重现性（相对标准偏差RSD = 1.31%），使其成为一种有前景的汞检测传感器。另一方面，动力学研究表明，准二级动力学是描述汞离子在光极表面吸附行为的最佳模型。此外，热力学参数表明反应是自发的（ΔG < 0）且吸热的（ΔH < 0）。而且，最大吸附容量为73.2 mg/g。因此，该光极成功应用于检测和/或去除不同实际样品中的汞，包括黄瓜、鱼、土壤和水样，回收率高达98.1 - 99.5%。
