<i>Pithecellobium dulce</i> Leaf-Derived Carbon Dots for 4-Nitrophenol and Cr(VI) Detection
Luminescent carbon dots (CDs) synthesized from <i>Pithecellobium dulce</i> (P. Dulce) leaves, in a simple, single-step carbonization procedure, were used as optical nanosensors. TEM revealed the crystalline nature of the CDs with the average dimension of 20 nm with a quantum yield of 24%...
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MDPI AG
2022-12-01
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| Series: | Chemosensors |
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| Online Access: | https://www.mdpi.com/2227-9040/10/12/532 |
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| author | Simei Darinel Torres Landa Inderbir Kaur Vivechana Agarwal |
| author_facet | Simei Darinel Torres Landa Inderbir Kaur Vivechana Agarwal |
| author_sort | Simei Darinel Torres Landa |
| collection | DOAJ |
| description | Luminescent carbon dots (CDs) synthesized from <i>Pithecellobium dulce</i> (P. Dulce) leaves, in a simple, single-step carbonization procedure, were used as optical nanosensors. TEM revealed the crystalline nature of the CDs with the average dimension of 20 nm with a quantum yield of 24%. In addition to carbon, the X-ray photoelectron spectroscopy shows the presence of oxygen and nitrogen. The FTIR spectra and Zeta potential were used for additional characterization of the nanoprobes. Among the contaminants and heavy metals, the proposed nanoprobes were found to be selective towards 4-nitrophenol (4-NP) and Cr(VI), respectively. The emission response of CDs towards 4-NP solution not only reveals the high sensitivity of the CDs (Limit of detection (LOD) of 14 nM) but also demonstrates a color change (light to dark yellow) that is attributed to spontaneous deprotonation detectable with the naked eye. The selectivity of CDs towards Cr(VI) (LOD 0.9 nM) was also tested in the presence of other metals. The quenching mechanism has been attributed to the inner filter effect for both analytes. The observed low detection limits in river and tap water opens up the possible applicability of the proposed nanoprobes as optical sensors in environmental pollution monitoring. |
| first_indexed | 2024-03-09T17:12:30Z |
| format | Article |
| id | doaj.art-8b312ff6537a408ca79635d52578192d |
| institution | Directory Open Access Journal |
| issn | 2227-9040 |
| language | English |
| last_indexed | 2024-03-09T17:12:30Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Chemosensors |
| spelling | doaj.art-8b312ff6537a408ca79635d52578192d2023-11-24T13:59:34ZengMDPI AGChemosensors2227-90402022-12-01101253210.3390/chemosensors10120532<i>Pithecellobium dulce</i> Leaf-Derived Carbon Dots for 4-Nitrophenol and Cr(VI) DetectionSimei Darinel Torres Landa0Inderbir Kaur1Vivechana Agarwal2Center for Research Engineering and Applied Sciences, Autonomous State University of Morelos (CIICAp-UAEM), Av. Univ. 1001, Col. Chamilpa, Cuernavaca 62209, Morelos, MexicoDepartment of Electronics, Bhaskaracharya College of Applied Sciences, University of Delhi, Delhi 110075, IndiaCenter for Research Engineering and Applied Sciences, Autonomous State University of Morelos (CIICAp-UAEM), Av. Univ. 1001, Col. Chamilpa, Cuernavaca 62209, Morelos, MexicoLuminescent carbon dots (CDs) synthesized from <i>Pithecellobium dulce</i> (P. Dulce) leaves, in a simple, single-step carbonization procedure, were used as optical nanosensors. TEM revealed the crystalline nature of the CDs with the average dimension of 20 nm with a quantum yield of 24%. In addition to carbon, the X-ray photoelectron spectroscopy shows the presence of oxygen and nitrogen. The FTIR spectra and Zeta potential were used for additional characterization of the nanoprobes. Among the contaminants and heavy metals, the proposed nanoprobes were found to be selective towards 4-nitrophenol (4-NP) and Cr(VI), respectively. The emission response of CDs towards 4-NP solution not only reveals the high sensitivity of the CDs (Limit of detection (LOD) of 14 nM) but also demonstrates a color change (light to dark yellow) that is attributed to spontaneous deprotonation detectable with the naked eye. The selectivity of CDs towards Cr(VI) (LOD 0.9 nM) was also tested in the presence of other metals. The quenching mechanism has been attributed to the inner filter effect for both analytes. The observed low detection limits in river and tap water opens up the possible applicability of the proposed nanoprobes as optical sensors in environmental pollution monitoring.https://www.mdpi.com/2227-9040/10/12/532green synthesisoptical sensorcarbon dotsCr(VI)4-Nitrophenolphotoluminescence |
| spellingShingle | Simei Darinel Torres Landa Inderbir Kaur Vivechana Agarwal <i>Pithecellobium dulce</i> Leaf-Derived Carbon Dots for 4-Nitrophenol and Cr(VI) Detection Chemosensors green synthesis optical sensor carbon dots Cr(VI) 4-Nitrophenol photoluminescence |
| title | <i>Pithecellobium dulce</i> Leaf-Derived Carbon Dots for 4-Nitrophenol and Cr(VI) Detection |
| title_full | <i>Pithecellobium dulce</i> Leaf-Derived Carbon Dots for 4-Nitrophenol and Cr(VI) Detection |
| title_fullStr | <i>Pithecellobium dulce</i> Leaf-Derived Carbon Dots for 4-Nitrophenol and Cr(VI) Detection |
| title_full_unstemmed | <i>Pithecellobium dulce</i> Leaf-Derived Carbon Dots for 4-Nitrophenol and Cr(VI) Detection |
| title_short | <i>Pithecellobium dulce</i> Leaf-Derived Carbon Dots for 4-Nitrophenol and Cr(VI) Detection |
| title_sort | i pithecellobium dulce i leaf derived carbon dots for 4 nitrophenol and cr vi detection |
| topic | green synthesis optical sensor carbon dots Cr(VI) 4-Nitrophenol photoluminescence |
| url | https://www.mdpi.com/2227-9040/10/12/532 |
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