3A-Amino-3A-Deoxy-(2AS,3AS)-β-Cyclodextrin Hydrate/Tin Disulfide Modified Screen-Printed Carbon Electrode for the Electrochemical Detection of Polychlorinated Biphenyl

Autor: CHENG, CHIA-YIN, 鄭嘉茵
Rok vydání: 2019
Druh dokumentu: 學位論文 ; thesis
Popis: 107
Polychlorinated biphenyls (PCBs) are persistent organic pollutants which are widely distributed in the environment. It is noteworthy that PCBs are endocrine disrupting substances, and their toxicity would lead to cancer and damage mammalian reproductive system, immune system, stomach, skin, liver, etc. This study aimed to synthesize 3A-Amino-3A-Deoxy-(2AS,3AS)-β-Cyclodextrin Hydrate/tin disulfide composite material, and to study its material properties, electrochemical properties and the application on polychlorinated biphenyls (PCBs) detection. In the past, PCBs have been released into the environment due to accidents, leakage of industrial facilities and incorrect treatment methods. Therefore, the detection of PCBs is extremely important in industrial products and environmental monitoring. Electrochemical detection methods have played crucial roles in the detection of environmental pollutants in recent years, while unmodified electrodes exhibit lower conductivity and electrocatalytic activity. Therefore, those electrodes with high conductivity and electrocatalytic activity draw a lot of attentions. In the decades, metal sulfides have been widely studied due to their abundant oxidation-reduction property, higher viability, conductivity and better stability. In this study, for the detection of polychlorinated biphenyls, the nanostructured tin disulfide (SnS2) synthesized by hydrothermal technique and 3A-Amino-3A-Deoxy-(2AS,3AS)-β-Cyclodextrin Hydrate were sequentially modified onto disposable screen-printed carbon electrode (SPCE) by titration method using a micropipette. 3A-Amino-3A-Deoxy-(2AS,3AS)-β-Cyclodextrin Hydrate (β-CD) improved the selectivity of the modified electrode. X-ray diffraction analysis (XRD) and field emission scanning electron microscopy (FE-SEM) were used to analyze the structure and morphology of the materials. Cyclic voltammetry and electrochemical impedance spectroscopy were used to analyze the electrochemical performance of the β-CD /SnS2/SPCE. Further, the cyclic voltammetry and differential pulse voltammetry were carried out for the detection of PCBs changes. The detection range were 0.625~80 μM, limitation 5μM. The electrodes were stable as 88% after 7 days storage. The results showed that the β-CD successfully encapsulated PCBs to achieve an electrochemical sensor that reduced the time and increased the convenience of PCBs detection.
Databáze: Networked Digital Library of Theses & Dissertations
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