Synthesis and Characterization of Ru-MOFs on Microelectrode for Trace Mercury Detection
Mercury ions (Hg<inline-formula><math display="inline"><semantics><msup><mrow></mrow><mrow><mn>2</mn><mo>+</mo></mrow></msup></semantics></math></inline-formula>) pollution in the water environm...
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MDPI AG
2020-11-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/20/22/6686 |
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| author | Chenyu Xiong Yuhao Xu Chao Bian Ri Wang Yong Xie Mingjie Han Shanhong Xia |
| author_facet | Chenyu Xiong Yuhao Xu Chao Bian Ri Wang Yong Xie Mingjie Han Shanhong Xia |
| author_sort | Chenyu Xiong |
| collection | DOAJ |
| description | Mercury ions (Hg<inline-formula><math display="inline"><semantics><msup><mrow></mrow><mrow><mn>2</mn><mo>+</mo></mrow></msup></semantics></math></inline-formula>) pollution in the water environment can cause serious harm to human health. Trace Hg<inline-formula><math display="inline"><semantics><msup><mrow></mrow><mrow><mn>2</mn><mo>+</mo></mrow></msup></semantics></math></inline-formula> detection is of vital importance for environmental monitoring. Herein, we report a novel design of Ru-MOFs modified gold microelectrode for Hg<inline-formula><math display="inline"><semantics><msup><mrow></mrow><mrow><mn>2</mn><mo>+</mo></mrow></msup></semantics></math></inline-formula> determination. Ru-MOFs are synthesized directly by the cathodic method on gold microelectrode, with the covered area accurately controlled. Cathodic synthesized Ru-MOFs show good conductivity and are suitable to be used as the electrode surface material directly. The synergy of the pre-deposition process and the adsorption process of Ru-MOFs can effectively improves the performance of the sensor. The results show good linearity (R<inline-formula><math display="inline"><semantics><msup><mrow></mrow><mn>2</mn></msup></semantics></math></inline-formula> = 0.996) from 0.1 ppb to 5 ppb, with a high sensitivity of 0.583 <inline-formula><math display="inline"><semantics><mi mathvariant="sans-serif">μ</mi></semantics></math></inline-formula>A ppb<inline-formula><math display="inline"><semantics><msup><mrow></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></semantics></math></inline-formula> mm<inline-formula><math display="inline"><semantics><msup><mrow></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup></semantics></math></inline-formula>. The limit of detection is found to be 0.08 ppb and the test process is within 6 min. Most importantly, the senor has a good anti-interference ability and the recoveries are satisfactory. This miniature electrochemical sensor has the potential for on-site detection of trace mercury in the field. |
| first_indexed | 2024-03-10T14:38:39Z |
| format | Article |
| id | doaj.art-2b9463164e754af5b8950c48dd8b8850 |
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| issn | 1424-8220 |
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| last_indexed | 2024-03-10T14:38:39Z |
| publishDate | 2020-11-01 |
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| spelling | doaj.art-2b9463164e754af5b8950c48dd8b88502023-11-20T21:56:09ZengMDPI AGSensors1424-82202020-11-012022668610.3390/s20226686Synthesis and Characterization of Ru-MOFs on Microelectrode for Trace Mercury DetectionChenyu Xiong0Yuhao Xu1Chao Bian2Ri Wang3Yong Xie4Mingjie Han5Shanhong Xia6State Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, ChinaState Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, ChinaState Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, ChinaState Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, ChinaState Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, ChinaState Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, ChinaState Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, ChinaMercury ions (Hg<inline-formula><math display="inline"><semantics><msup><mrow></mrow><mrow><mn>2</mn><mo>+</mo></mrow></msup></semantics></math></inline-formula>) pollution in the water environment can cause serious harm to human health. Trace Hg<inline-formula><math display="inline"><semantics><msup><mrow></mrow><mrow><mn>2</mn><mo>+</mo></mrow></msup></semantics></math></inline-formula> detection is of vital importance for environmental monitoring. Herein, we report a novel design of Ru-MOFs modified gold microelectrode for Hg<inline-formula><math display="inline"><semantics><msup><mrow></mrow><mrow><mn>2</mn><mo>+</mo></mrow></msup></semantics></math></inline-formula> determination. Ru-MOFs are synthesized directly by the cathodic method on gold microelectrode, with the covered area accurately controlled. Cathodic synthesized Ru-MOFs show good conductivity and are suitable to be used as the electrode surface material directly. The synergy of the pre-deposition process and the adsorption process of Ru-MOFs can effectively improves the performance of the sensor. The results show good linearity (R<inline-formula><math display="inline"><semantics><msup><mrow></mrow><mn>2</mn></msup></semantics></math></inline-formula> = 0.996) from 0.1 ppb to 5 ppb, with a high sensitivity of 0.583 <inline-formula><math display="inline"><semantics><mi mathvariant="sans-serif">μ</mi></semantics></math></inline-formula>A ppb<inline-formula><math display="inline"><semantics><msup><mrow></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></semantics></math></inline-formula> mm<inline-formula><math display="inline"><semantics><msup><mrow></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup></semantics></math></inline-formula>. The limit of detection is found to be 0.08 ppb and the test process is within 6 min. Most importantly, the senor has a good anti-interference ability and the recoveries are satisfactory. This miniature electrochemical sensor has the potential for on-site detection of trace mercury in the field.https://www.mdpi.com/1424-8220/20/22/6686mercury ionsmetal-organic frameworkselectrochemical micro-sensorcathodic synthesis |
| spellingShingle | Chenyu Xiong Yuhao Xu Chao Bian Ri Wang Yong Xie Mingjie Han Shanhong Xia Synthesis and Characterization of Ru-MOFs on Microelectrode for Trace Mercury Detection Sensors mercury ions metal-organic frameworks electrochemical micro-sensor cathodic synthesis |
| title | Synthesis and Characterization of Ru-MOFs on Microelectrode for Trace Mercury Detection |
| title_full | Synthesis and Characterization of Ru-MOFs on Microelectrode for Trace Mercury Detection |
| title_fullStr | Synthesis and Characterization of Ru-MOFs on Microelectrode for Trace Mercury Detection |
| title_full_unstemmed | Synthesis and Characterization of Ru-MOFs on Microelectrode for Trace Mercury Detection |
| title_short | Synthesis and Characterization of Ru-MOFs on Microelectrode for Trace Mercury Detection |
| title_sort | synthesis and characterization of ru mofs on microelectrode for trace mercury detection |
| topic | mercury ions metal-organic frameworks electrochemical micro-sensor cathodic synthesis |
| url | https://www.mdpi.com/1424-8220/20/22/6686 |
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