Electrochemical Sensing of H2S Gas in Air by Carboxylated Multi-walled Carbon Nanotubes
The electrochemical sensor for detecting hydrogen sulfide was fabricated. H2S gas molecules pass through polytetrafluoroethylene membrane with 0.22 mm pore size. Carboxylated multi-walled carbon nanotubes (MWCNTs-COOH) were used to fabricate working and counter electrodes. It can be seen from Field...
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| Format: | Article |
| Language: | English |
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Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECR
2019-12-01
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| Series: | Iranian Journal of Chemistry & Chemical Engineering |
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| Online Access: | http://www.ijcce.ac.ir/article_32649_ee66689ea48b758ecc6a031462a9301d.pdf |
| _version_ | 1824026175783043072 |
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| author | Nahid Parsafar Vahid Ghafouri Aghdas Banaei |
| author_facet | Nahid Parsafar Vahid Ghafouri Aghdas Banaei |
| author_sort | Nahid Parsafar |
| collection | DOAJ |
| description | The electrochemical sensor for detecting hydrogen sulfide was fabricated. H2S gas molecules pass through polytetrafluoroethylene membrane with 0.22 mm pore size. Carboxylated multi-walled carbon nanotubes (MWCNTs-COOH) were used to fabricate working and counter electrodes. It can be seen from Field Emission Scanning Electron Microscopy (FESEM) images of the working electrode that MWCNTs-COOH is distributed fairly uniform on the hydrophobic membrane. Quantitative results of Energy Dispersive X-ray (EDX) analysis show the presence of carbon (85.95 wt %) and oxygen (12.95 wt %) on the working electrode. The cyclic voltammetry results show the MWCNTs-COOH responds to H2S. The sensor response up to 56 ppm of H2S gas was measured by chronoamperometry. The sensor showed linear behavior up to 16 ppm. The detection limit of the sensor is 310 ppb and its sensitivity 48 hours after assembling is 0.1436 µA/ ppm. The averages of response and recovery times for 10 ppm of H2S were obtained 6.06 and 4.13 minutes respectively. The sensor with functionalized carbon nanotubes has many advantages than the sensor with raw carbon nanotubes; include more uniformity of fabricated electrodes, greater response, and less noise. Using functionalized carbon nanotubes concerning raw nanotubes increases the response of the sensor by 14.8 times at 10 ppm of H2S. Also, the response of the sensor to 250 ppm concentration of carbon monoxide gas was 4.35 nA which is very low concerning sensor response for hydrogen sulfide (1.64 µA for 10 ppm of H2S). |
| first_indexed | 2024-12-19T11:11:21Z |
| format | Article |
| id | doaj.art-99ab15e4d3a14893ae9ff59b44b960a0 |
| institution | Directory Open Access Journal |
| issn | 1021-9986 1021-9986 |
| language | English |
| last_indexed | 2024-12-19T11:11:21Z |
| publishDate | 2019-12-01 |
| publisher | Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECR |
| record_format | Article |
| series | Iranian Journal of Chemistry & Chemical Engineering |
| spelling | doaj.art-99ab15e4d3a14893ae9ff59b44b960a02022-12-21T20:24:13ZengIranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry & Chemical Engineering1021-99861021-99862019-12-01386536232649Electrochemical Sensing of H2S Gas in Air by Carboxylated Multi-walled Carbon NanotubesNahid Parsafar0Vahid Ghafouri1Aghdas Banaei2Department of Physics, Research Institute of Applied Sciences, Academic Center of Education, Culture and Research (ACECR), Tehran, I.R. IRANDepartment of Physics, Research Institute of Applied Sciences, Academic Center of Education, Culture and Research (ACECR), Tehran, I.R. IRANDepartment of Physics, Research Institute of Applied Sciences, Academic Center of Education, Culture and Research (ACECR), Tehran, I.R. IRANThe electrochemical sensor for detecting hydrogen sulfide was fabricated. H2S gas molecules pass through polytetrafluoroethylene membrane with 0.22 mm pore size. Carboxylated multi-walled carbon nanotubes (MWCNTs-COOH) were used to fabricate working and counter electrodes. It can be seen from Field Emission Scanning Electron Microscopy (FESEM) images of the working electrode that MWCNTs-COOH is distributed fairly uniform on the hydrophobic membrane. Quantitative results of Energy Dispersive X-ray (EDX) analysis show the presence of carbon (85.95 wt %) and oxygen (12.95 wt %) on the working electrode. The cyclic voltammetry results show the MWCNTs-COOH responds to H2S. The sensor response up to 56 ppm of H2S gas was measured by chronoamperometry. The sensor showed linear behavior up to 16 ppm. The detection limit of the sensor is 310 ppb and its sensitivity 48 hours after assembling is 0.1436 µA/ ppm. The averages of response and recovery times for 10 ppm of H2S were obtained 6.06 and 4.13 minutes respectively. The sensor with functionalized carbon nanotubes has many advantages than the sensor with raw carbon nanotubes; include more uniformity of fabricated electrodes, greater response, and less noise. Using functionalized carbon nanotubes concerning raw nanotubes increases the response of the sensor by 14.8 times at 10 ppm of H2S. Also, the response of the sensor to 250 ppm concentration of carbon monoxide gas was 4.35 nA which is very low concerning sensor response for hydrogen sulfide (1.64 µA for 10 ppm of H2S).http://www.ijcce.ac.ir/article_32649_ee66689ea48b758ecc6a031462a9301d.pdfhydrogen sulfideelectrochemical sensormwcnts- coohhydrophobic polytetrafluoroethylene membranesulfuric acid |
| spellingShingle | Nahid Parsafar Vahid Ghafouri Aghdas Banaei Electrochemical Sensing of H2S Gas in Air by Carboxylated Multi-walled Carbon Nanotubes Iranian Journal of Chemistry & Chemical Engineering hydrogen sulfide electrochemical sensor mwcnts- cooh hydrophobic polytetrafluoroethylene membrane sulfuric acid |
| title | Electrochemical Sensing of H2S Gas in Air by Carboxylated Multi-walled Carbon Nanotubes |
| title_full | Electrochemical Sensing of H2S Gas in Air by Carboxylated Multi-walled Carbon Nanotubes |
| title_fullStr | Electrochemical Sensing of H2S Gas in Air by Carboxylated Multi-walled Carbon Nanotubes |
| title_full_unstemmed | Electrochemical Sensing of H2S Gas in Air by Carboxylated Multi-walled Carbon Nanotubes |
| title_short | Electrochemical Sensing of H2S Gas in Air by Carboxylated Multi-walled Carbon Nanotubes |
| title_sort | electrochemical sensing of h2s gas in air by carboxylated multi walled carbon nanotubes |
| topic | hydrogen sulfide electrochemical sensor mwcnts- cooh hydrophobic polytetrafluoroethylene membrane sulfuric acid |
| url | http://www.ijcce.ac.ir/article_32649_ee66689ea48b758ecc6a031462a9301d.pdf |
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