期刊
SENSORS
卷 22, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/s22031151
关键词
pencil graphite electrode; pre-anodization; poly(thionine); 3-nitrophenol; 4-nitrophenol; water samples
资金
- National Research Foundation (NRF) of Korea [2021R1A2B5B01001796, 2019R1I1A1A01048852, 2021R1F1A1062528, 2021R1A4A5031805]
- Technology Innovation Program [20013597]
- Ministry of Trade, Industry Energy
- National Research Foundation of Korea [2021R1F1A1062528, 2019R1I1A1A01048852] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A simple and sensitive sensing protocol was developed using a pre-anodized graphite pencil electrode surface coated with poly(thionine) for simultaneous sensing of 3-nitrophenol and 4-nitrophenol. The poly(thionine) coated electrode exhibited enhanced electrocatalytic activity towards the reduction of both nitrophenols, allowing for their simultaneous analysis. The optimized experimental conditions resulted in a wide linear concentration range and low detection limits, with good recovery rates for real sample analysis. The sensor demonstrated promising selectivity, stability, and reproducibility for sensing 3-nitrophenol and 4-nitrophenol.
A very simple, as well as sensitive and selective, sensing protocol was developed on a pre-anodized graphite pencil electrode surface coated using poly(thionine) (APGE/PTH). The poly(thionine) coated graphite pencil was then used for simultaneous sensing of 3-nitrophenol (3-NP) and 4-nitrophenol (4-NP). The poly(thionine) coated electrode exhibited an enhanced electrocatalytic property towards nitrophenol (3-NP and 4-NP) reduction. Redox peak potential and current of both nitrophenols were found well resolved and their simultaneous analysis was studied. Under optimized experimental conditions, APGE/PTH showed a long linear concentration range from 20 to 230 nM and 15 nM to 280 nM with a calculated limit of detection (LOD) of 4.5 and 4 nM and a sensitivity of 22.45 mu A/nM and 27.12 mu A/nM for 3-NP and 4-NP, respectively. Real sample analysis using the prepared sensor was tested with different environmental water samples and the sensors exhibited excellent recovery results in the range from 98.16 to 103.43%. Finally, the sensor exposed an promising selectivity, stability, and reproducibility towards sensing of 3-NP and 4-NP.
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