電化學酚類感測器及廢水電解處理系統的研發

Abstract

本研究開發了電化學酚類感測器以及酚類電解處理系統，並可整合成一具有酚類檢測及處理效能之複合式模組。 電化學酚類感測器利用流動注射分析系統為主體，搭配電化學介質（10 mM 黃血鹽溶液 in 10 mM, pH7.0 磷酸鹽緩衝溶液）所組成，其可避免檢測電極受到直接氧化酚類所受到的污染，並且在檢測電位為0.4 V、系統流速為0.4 ml/min之下，架構出一檢測極限至25 μM鄰苯二酚且可在3 min內檢測完成之分析系統。 酚類電解處理系統為利用活性碳粉末（Activated carbon powder，99~250 μm）自製一酚類反應器(2 mm i.d × 6 cm)，配合定電壓源施予偏壓架構出一電解處理系統，每公克活性碳粉末約可處理約 0.7g，並與第一部分電化學酚類檢測系統整合為一即時檢測處理系統。

An amperometric flow-injection analytical (FIA) system was developed for detecting phenols in waste water. To avoid electrode fouling during direct oxidation of phenols, mediator such as ferricyanide was introduced in the carrier (10 mM phosphate buffer, pH 7.0) to couple the oxidation reaction (0.4 V vs. Ag/AgCl; flow rate: 0.4 ml/min). Approximately 3 min after injecting 100 μl of sample solution, 25 μM catechol can be detected with S/N ratio higher than 3. There is practically no decrease in signal after 100 injections. A phenol-removing model system was then constructed for reducing phenols such as endocrine disrupting chemicals. It was based on the adsorption of the hazardous chemicals on a packed-bed reactor (2 mm i.d × 6 cm) containing activated carbon powder (99~250 μm). The system can tolerate water containing 100 mM phenols.