| 摘要: | 環境保護和水質監測是當今社會面臨的重要課題之一，化學需氧量（COD）的檢測對於評估水體中有機污染物的含量至關重要。傳統COD分析方法仍存在許多缺點，例如：分析時間長、氧化能力受限、有毒性試劑的二次污染等。而電化學方法不僅具有快速分析、高靈敏度、環境友善等優點，還可應用於現場監測及分析，使其逐漸受到關注。
本研究透過溶膠-凝膠法製備二氧化鈦/單壁奈米碳管複合材料並用於修飾電極，以線性掃描伏安法在最佳掃描條件（電解質為0.1 M氯化鈉緩衝溶液、掃描速度為0.15 V s–1）下進行水樣之COD分析，包括模擬水樣及真實水樣。其中，模擬水樣分為單一水樣及複合水樣，選用的有機物包含：鄰苯二甲酸氫鉀、葡萄糖、乙醇胺、水楊酸、二甲基甲醯胺。理論需氧量（ThOD）線性範圍介於20–100 mg L–1。此外，選用了其中三種有機物倆倆混合成不同比例的複合水樣，以探討有機物間彼此的相互作用。結果顯示，分析所得的峰值電流與ThOD皆呈現正相關。對於修飾電極的再現性分析，相對標準偏差為4.93%。真實水樣的部分則是將製備的修飾電極用於測定平鎮工業區污水廠之放流水，結果表明良好的線性特性使其在真實水樣中的應用變得更為實際。因此，證實了二氧化鈦/單壁奈米碳管/網版印刷電極在COD量測方面具有良好的潛力，使其在環境監測、水質管理和相關領域中具有廣泛的應用前景。
;Environmental protection and water quality monitoring are one of the important issues facing today′s society. The detection of chemical oxygen demand (COD) is crucial for assessing the content of organic pollutants in water bodies. Traditional COD analysis methods still have many shortcomings, such as long analysis time, limited oxidation capacity, and secondary pollution from toxic reagents. The electrochemical method not only has the advantages of rapid analysis, high sensitivity, and environmental friendliness, but can also be applied to on-site monitoring and analysis, making it gradually attract attention.
In this study, titanium dioxide/single-walled carbon nanotube composites were prepared by the sol-gel method and used to modify screen-printed electrodes (SPE). Linear scan voltammetry (LSV) was used under optimal scanning conditions (the electrolyte was 0.1 M sodium chloride buffer solution, COD analysis of water samples, including simulated water samples and real water samples, is performed at a scanning speed of 0.15 V s–1). Among them, simulated water samples are divided into single water samples and composite water samples. The selected organic substances include: potassium hydrogen phthalate, glucose, ethanolamine, salicylic acid, and dimethylformamide. The theoretical oxygen demand (ThOD) linear range is between 20–100 mg L–1. In addition, three of the organic compounds were mixed into composite water samples in different proportions to explore the interaction between the organic compounds. The results showed that the peak current analyzed and ThOD showed a positive correlation. For the reproducibility analysis of the modified electrode, the relative standard deviation was 4.93%. For real water samples, the prepared modified electrode was used to measure the discharge water from the sewage treatment plant in Pingzhen Industrial Zone. The results showed that the good linear characteristics made its application in real water samples more practical. Therefore, it is confirmed that the TiO2/SWCNT/SPE has good potential in COD measurement, making it have broad application prospects in environmental monitoring, water quality management, and related fields. |
