Novel Hg (II) selective fluorescent green sensor based on carbon dots synthesized from starch and functionalized with methimazole
We describe a green new method for the synthesis of water-soluble photoluminescent carbon dots (CDs) that were functionalized with methimazole (MTZ) and applied to determine Hg2+ based on the fluorescence extinction. Starch obtained from rice was used as a natural source for the production of CDs by...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2021-04-01
|
| Series: | Ecotoxicology and Environmental Safety |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0147651321001548 |
| _version_ | 1831591984819601408 |
|---|---|
| author | Maria Carolina Robaina Vieira Felipe Andrade Carvalho Mathews Krambeck de Oliveira Franco Willian Toito Suarez Castelo Bandane Vilanculo Marcelo Henrique dos Santos Francisco Fernandes Gambarra-Neto |
| author_facet | Maria Carolina Robaina Vieira Felipe Andrade Carvalho Mathews Krambeck de Oliveira Franco Willian Toito Suarez Castelo Bandane Vilanculo Marcelo Henrique dos Santos Francisco Fernandes Gambarra-Neto |
| author_sort | Maria Carolina Robaina Vieira |
| collection | DOAJ |
| description | We describe a green new method for the synthesis of water-soluble photoluminescent carbon dots (CDs) that were functionalized with methimazole (MTZ) and applied to determine Hg2+ based on the fluorescence extinction. Starch obtained from rice was used as a natural source for the production of CDs by hydrothermal treatment. Also, it was proposed a factorial design to optimize the parameters for CD synthesis and the results showed that the luminescence intensity is a function of temperature and not of the heating time in the hydrothermal process. The synthesized CDs were characterized using fluorescence techniques, Fourier transform infrared spectroscopy (FTIR), and UV–Vis spectroscopy. Through transmission electron microscopy (TEM) and dynamic light scattering (DLS), it was found the formation of CDs on a nanometer scale with an average size of 11 nm. The functionalization with MTZ, eliminated all interferences from other metals, indicating a selective response to Hg2+ ions. The method was applied to Hg2+ determination in waters. Under optimal conditions, was obtained a limit of detection of 1.8 × 10−7 mol L−1 with a linear range from 3.3 × 10−7 to 50.0 × 10−6 mol L−1. Therefore, the proposed method can be considered a simple, selective, and precise alternative that minimizes the number of reagents used for Hg2+ determination in natural waters, and can be applied on a large scale in environmental analyzes. |
| first_indexed | 2024-12-18T01:35:19Z |
| format | Article |
| id | doaj.art-8c789506fc444e1ab85d77b985d2996a |
| institution | Directory Open Access Journal |
| issn | 0147-6513 |
| language | English |
| last_indexed | 2024-12-18T01:35:19Z |
| publishDate | 2021-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Ecotoxicology and Environmental Safety |
| spelling | doaj.art-8c789506fc444e1ab85d77b985d2996a2022-12-21T21:25:28ZengElsevierEcotoxicology and Environmental Safety0147-65132021-04-01213112043Novel Hg (II) selective fluorescent green sensor based on carbon dots synthesized from starch and functionalized with methimazoleMaria Carolina Robaina Vieira0Felipe Andrade Carvalho1Mathews Krambeck de Oliveira Franco2Willian Toito Suarez3Castelo Bandane Vilanculo4Marcelo Henrique dos Santos5Francisco Fernandes Gambarra-Neto6Department of Chemistry, Federal University of Viçosa, Viçosa, MG 36570-900, BrazilDepartment of Chemistry, Federal University of Viçosa, Viçosa, MG 36570-900, BrazilDepartment of Chemistry, Federal University of Viçosa, Viçosa, MG 36570-900, BrazilDepartment of Chemistry, Federal University of Viçosa, Viçosa, MG 36570-900, Brazil; Correspondence to: Centro de Ciências Exatas e Tecnológicas, Universidade Federal de Viçosa, Avenida Peter Henry Rolphs, s/n, Viçosa, MG 36570-900, Brazil.Department of Chemistry, Federal University of Viçosa, Viçosa, MG 36570-900, BrazilDepartment of Chemistry, Federal University of Viçosa, Viçosa, MG 36570-900, BrazilBrazilian Enterprise for Agricultural Research, Campina Grande, PB 58428-095, BrazilWe describe a green new method for the synthesis of water-soluble photoluminescent carbon dots (CDs) that were functionalized with methimazole (MTZ) and applied to determine Hg2+ based on the fluorescence extinction. Starch obtained from rice was used as a natural source for the production of CDs by hydrothermal treatment. Also, it was proposed a factorial design to optimize the parameters for CD synthesis and the results showed that the luminescence intensity is a function of temperature and not of the heating time in the hydrothermal process. The synthesized CDs were characterized using fluorescence techniques, Fourier transform infrared spectroscopy (FTIR), and UV–Vis spectroscopy. Through transmission electron microscopy (TEM) and dynamic light scattering (DLS), it was found the formation of CDs on a nanometer scale with an average size of 11 nm. The functionalization with MTZ, eliminated all interferences from other metals, indicating a selective response to Hg2+ ions. The method was applied to Hg2+ determination in waters. Under optimal conditions, was obtained a limit of detection of 1.8 × 10−7 mol L−1 with a linear range from 3.3 × 10−7 to 50.0 × 10−6 mol L−1. Therefore, the proposed method can be considered a simple, selective, and precise alternative that minimizes the number of reagents used for Hg2+ determination in natural waters, and can be applied on a large scale in environmental analyzes.http://www.sciencedirect.com/science/article/pii/S0147651321001548Carbon dotsMercury(II)MethimazoleStarchWater |
| spellingShingle | Maria Carolina Robaina Vieira Felipe Andrade Carvalho Mathews Krambeck de Oliveira Franco Willian Toito Suarez Castelo Bandane Vilanculo Marcelo Henrique dos Santos Francisco Fernandes Gambarra-Neto Novel Hg (II) selective fluorescent green sensor based on carbon dots synthesized from starch and functionalized with methimazole Ecotoxicology and Environmental Safety Carbon dots Mercury(II) Methimazole Starch Water |
| title | Novel Hg (II) selective fluorescent green sensor based on carbon dots synthesized from starch and functionalized with methimazole |
| title_full | Novel Hg (II) selective fluorescent green sensor based on carbon dots synthesized from starch and functionalized with methimazole |
| title_fullStr | Novel Hg (II) selective fluorescent green sensor based on carbon dots synthesized from starch and functionalized with methimazole |
| title_full_unstemmed | Novel Hg (II) selective fluorescent green sensor based on carbon dots synthesized from starch and functionalized with methimazole |
| title_short | Novel Hg (II) selective fluorescent green sensor based on carbon dots synthesized from starch and functionalized with methimazole |
| title_sort | novel hg ii selective fluorescent green sensor based on carbon dots synthesized from starch and functionalized with methimazole |
| topic | Carbon dots Mercury(II) Methimazole Starch Water |
| url | http://www.sciencedirect.com/science/article/pii/S0147651321001548 |
| work_keys_str_mv | AT mariacarolinarobainavieira novelhgiiselectivefluorescentgreensensorbasedoncarbondotssynthesizedfromstarchandfunctionalizedwithmethimazole AT felipeandradecarvalho novelhgiiselectivefluorescentgreensensorbasedoncarbondotssynthesizedfromstarchandfunctionalizedwithmethimazole AT mathewskrambeckdeoliveirafranco novelhgiiselectivefluorescentgreensensorbasedoncarbondotssynthesizedfromstarchandfunctionalizedwithmethimazole AT williantoitosuarez novelhgiiselectivefluorescentgreensensorbasedoncarbondotssynthesizedfromstarchandfunctionalizedwithmethimazole AT castelobandanevilanculo novelhgiiselectivefluorescentgreensensorbasedoncarbondotssynthesizedfromstarchandfunctionalizedwithmethimazole AT marcelohenriquedossantos novelhgiiselectivefluorescentgreensensorbasedoncarbondotssynthesizedfromstarchandfunctionalizedwithmethimazole AT franciscofernandesgambarraneto novelhgiiselectivefluorescentgreensensorbasedoncarbondotssynthesizedfromstarchandfunctionalizedwithmethimazole |