Copper Nanoparticles Confined in a Silica Nanochannel Film for the Electrochemical Detection of Nitrate Ions in Water Samples
The nitrate ion (NO<sub>3</sub><sup>−</sup>) is a typical pollutant in environmental samples, posing a threat to the aquatic ecosystem and human health. Therefore, rapid and accurate detection of NO<sub>3</sub><sup>−</sup> is crucial for both the aquat...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-11-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/28/22/7515 |
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| author | Dewang Li Shuai Xu Haiyan Jin Jinqing Wang Fei Yan |
| author_facet | Dewang Li Shuai Xu Haiyan Jin Jinqing Wang Fei Yan |
| author_sort | Dewang Li |
| collection | DOAJ |
| description | The nitrate ion (NO<sub>3</sub><sup>−</sup>) is a typical pollutant in environmental samples, posing a threat to the aquatic ecosystem and human health. Therefore, rapid and accurate detection of NO<sub>3</sub><sup>−</sup> is crucial for both the aquatic sciences and government regulations. Here we report the fabrication of an amino-functionalized, vertically ordered mesoporous silica film (NH<sub>2</sub>-VMSF) confining localized copper nanoparticles (CuNPs) for the electrochemical detection of NO<sub>3</sub><sup>−</sup>. NH<sub>2</sub>-VMSF-carrying amino groups possess an ordered perpendicular nanochannel structure and ultrasmall nanopores, enabling the confined growth of CuNPs through the electrodeposition method. The resulting CuNPs/NH<sub>2</sub>-VMSF-modified indium tin oxide (ITO) electrode (CuNPs/NH<sub>2</sub>-VMSF/ITO) combines the electrocatalytic reduction ability of CuNPs and the electrostatic attraction capacity of NH<sub>2</sub>-VMSF towards NO<sub>3</sub><sup>−</sup>. Thus, it is a rapid and sensitive electrochemical method for the determination of NO<sub>3</sub><sup>−</sup> with a wide linear detection range of 5.0–1000 μM and a low detection limit of 2.3 μM. Direct electrochemical detection of NO<sub>3</sub><sup>−</sup> in water samples (tap water, lake water, seawater, and rainwater) with acceptable recoveries ranging from 97.8% to 109% was performed, demonstrating that the proposed CuNPs/NH<sub>2</sub>-VMSF/ITO sensor has excellent reproducibility, regeneration, and anti-interference abilities. |
| first_indexed | 2024-03-09T16:34:41Z |
| format | Article |
| id | doaj.art-d2624906f80644d8a7ca9e303c273e6f |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-09T16:34:41Z |
| publishDate | 2023-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-d2624906f80644d8a7ca9e303c273e6f2023-11-24T14:58:04ZengMDPI AGMolecules1420-30492023-11-012822751510.3390/molecules28227515Copper Nanoparticles Confined in a Silica Nanochannel Film for the Electrochemical Detection of Nitrate Ions in Water SamplesDewang Li0Shuai Xu1Haiyan Jin2Jinqing Wang3Fei Yan4Donghai Laboratory, Zhoushan 316021, ChinaSchool of Chemistry and Chemical Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, ChinaDonghai Laboratory, Zhoushan 316021, ChinaCollege of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, ChinaSchool of Chemistry and Chemical Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, ChinaThe nitrate ion (NO<sub>3</sub><sup>−</sup>) is a typical pollutant in environmental samples, posing a threat to the aquatic ecosystem and human health. Therefore, rapid and accurate detection of NO<sub>3</sub><sup>−</sup> is crucial for both the aquatic sciences and government regulations. Here we report the fabrication of an amino-functionalized, vertically ordered mesoporous silica film (NH<sub>2</sub>-VMSF) confining localized copper nanoparticles (CuNPs) for the electrochemical detection of NO<sub>3</sub><sup>−</sup>. NH<sub>2</sub>-VMSF-carrying amino groups possess an ordered perpendicular nanochannel structure and ultrasmall nanopores, enabling the confined growth of CuNPs through the electrodeposition method. The resulting CuNPs/NH<sub>2</sub>-VMSF-modified indium tin oxide (ITO) electrode (CuNPs/NH<sub>2</sub>-VMSF/ITO) combines the electrocatalytic reduction ability of CuNPs and the electrostatic attraction capacity of NH<sub>2</sub>-VMSF towards NO<sub>3</sub><sup>−</sup>. Thus, it is a rapid and sensitive electrochemical method for the determination of NO<sub>3</sub><sup>−</sup> with a wide linear detection range of 5.0–1000 μM and a low detection limit of 2.3 μM. Direct electrochemical detection of NO<sub>3</sub><sup>−</sup> in water samples (tap water, lake water, seawater, and rainwater) with acceptable recoveries ranging from 97.8% to 109% was performed, demonstrating that the proposed CuNPs/NH<sub>2</sub>-VMSF/ITO sensor has excellent reproducibility, regeneration, and anti-interference abilities.https://www.mdpi.com/1420-3049/28/22/7515copper nanoparticlessilica nanochannel filmnitrate ionselectrochemical sensorwater samples |
| spellingShingle | Dewang Li Shuai Xu Haiyan Jin Jinqing Wang Fei Yan Copper Nanoparticles Confined in a Silica Nanochannel Film for the Electrochemical Detection of Nitrate Ions in Water Samples Molecules copper nanoparticles silica nanochannel film nitrate ions electrochemical sensor water samples |
| title | Copper Nanoparticles Confined in a Silica Nanochannel Film for the Electrochemical Detection of Nitrate Ions in Water Samples |
| title_full | Copper Nanoparticles Confined in a Silica Nanochannel Film for the Electrochemical Detection of Nitrate Ions in Water Samples |
| title_fullStr | Copper Nanoparticles Confined in a Silica Nanochannel Film for the Electrochemical Detection of Nitrate Ions in Water Samples |
| title_full_unstemmed | Copper Nanoparticles Confined in a Silica Nanochannel Film for the Electrochemical Detection of Nitrate Ions in Water Samples |
| title_short | Copper Nanoparticles Confined in a Silica Nanochannel Film for the Electrochemical Detection of Nitrate Ions in Water Samples |
| title_sort | copper nanoparticles confined in a silica nanochannel film for the electrochemical detection of nitrate ions in water samples |
| topic | copper nanoparticles silica nanochannel film nitrate ions electrochemical sensor water samples |
| url | https://www.mdpi.com/1420-3049/28/22/7515 |
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