{"title":"硫氮共掺杂碳量子点/聚氨酯纳米复合材料作为高灵敏度和选择性检测有毒汞 (II) 离子的新型荧光传感器","authors":"Farinaz Kamali, Khalil Faghihi, Alireza Abdoli, Seyed Yousef Mosavian","doi":"10.1007/s13726-024-01285-x","DOIUrl":null,"url":null,"abstract":"<p>Here in, new nitrogen and sulfur co-doped carbon quantum dots (N,S-CQDs)/polyurethane (PU) nanocomposites have been prepared as efficiently sensitive and selective fluorescent sensors to detect mercury ions. At first, N,S-CQDs as fluorescent nanoparticles, 1, 2-bis (4-isocyanatophenoxy) ethane and bis (2-hydroxy ethyl) terephthalate (BHET) containing two hydroxyl groups were synthesized. The N,S-CQD<sub>S</sub> nanoparticles were synthesized through microwave-assisted carbonization of PU wastes at the presence of sulfuric acid and thiourea. Then, new fluorescent polyurethane nanocomposites were synthesized through an in situ polymerization reaction between new fabricated diisocyanate, BHET and 5 and 10% (w/w) of the N,S-CQDs nanoparticles. The N,S-CQDs/PU-a (<b>6a</b>) and N,S-CQDs/PU-b (<b>6b</b>) nanocomposites containing 5 and 10% (w/w) of fluorescent nanoparticles showed a broad concentration range of 0–250 and 0–200 µM of mercury ions with quenching efficiencies (<i>η</i>) of 95% and 97%, respectively. The limit of detection (LOD), limit of quenching (LOQ), and quenching constant (<i>K</i><sub>sv</sub>) of two nanocomposites were calculated. According to the obtained results, the N,S-CQDs/PU-b nanocomposite (<b>6b</b>) exhibited better performance in Hg<sup>+2</sup> sensing because of lower LOD and LOQ and higher <i>K</i><sub>sv</sub> at lower concentrations of mercury ions. Therefore, an increase in the fluorescent nanoparticles loaded in the nanocomposite, led to an enhancement of the selectivity of mercury (II) ions and sensitivity to its detection. The N,S-CQDs/PU-b nanocomposite (<b>6b</b>) exhibited the LOD, LOQ, and <i>K</i><sub>sv</sub> values at 2.03 µM, 6.77 µM, and 6694.6 M<sup>−1</sup>, respectively. So, the synthesized N,S-CQDs/PU-b nanocomposite (<b>6b</b>) is an excellent sensor for mercury ions.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\n","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":null,"pages":null},"PeriodicalIF":2.4000,"publicationDate":"2024-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Sulfur and nitrogen co-doped carbon quantum dots/polyurethane nanocomposite as a new fluorescent sensor for highly sensitive and selective detection of toxic mercury (II) ions\",\"authors\":\"Farinaz Kamali, Khalil Faghihi, Alireza Abdoli, Seyed Yousef Mosavian\",\"doi\":\"10.1007/s13726-024-01285-x\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>Here in, new nitrogen and sulfur co-doped carbon quantum dots (N,S-CQDs)/polyurethane (PU) nanocomposites have been prepared as efficiently sensitive and selective fluorescent sensors to detect mercury ions. At first, N,S-CQDs as fluorescent nanoparticles, 1, 2-bis (4-isocyanatophenoxy) ethane and bis (2-hydroxy ethyl) terephthalate (BHET) containing two hydroxyl groups were synthesized. The N,S-CQD<sub>S</sub> nanoparticles were synthesized through microwave-assisted carbonization of PU wastes at the presence of sulfuric acid and thiourea. Then, new fluorescent polyurethane nanocomposites were synthesized through an in situ polymerization reaction between new fabricated diisocyanate, BHET and 5 and 10% (w/w) of the N,S-CQDs nanoparticles. The N,S-CQDs/PU-a (<b>6a</b>) and N,S-CQDs/PU-b (<b>6b</b>) nanocomposites containing 5 and 10% (w/w) of fluorescent nanoparticles showed a broad concentration range of 0–250 and 0–200 µM of mercury ions with quenching efficiencies (<i>η</i>) of 95% and 97%, respectively. The limit of detection (LOD), limit of quenching (LOQ), and quenching constant (<i>K</i><sub>sv</sub>) of two nanocomposites were calculated. According to the obtained results, the N,S-CQDs/PU-b nanocomposite (<b>6b</b>) exhibited better performance in Hg<sup>+2</sup> sensing because of lower LOD and LOQ and higher <i>K</i><sub>sv</sub> at lower concentrations of mercury ions. Therefore, an increase in the fluorescent nanoparticles loaded in the nanocomposite, led to an enhancement of the selectivity of mercury (II) ions and sensitivity to its detection. The N,S-CQDs/PU-b nanocomposite (<b>6b</b>) exhibited the LOD, LOQ, and <i>K</i><sub>sv</sub> values at 2.03 µM, 6.77 µM, and 6694.6 M<sup>−1</sup>, respectively. So, the synthesized N,S-CQDs/PU-b nanocomposite (<b>6b</b>) is an excellent sensor for mercury ions.</p><h3 data-test=\\\"abstract-sub-heading\\\">Graphical abstract</h3>\\n\",\"PeriodicalId\":601,\"journal\":{\"name\":\"Iranian Polymer Journal\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":2.4000,\"publicationDate\":\"2024-02-24\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Iranian Polymer Journal\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://doi.org/10.1007/s13726-024-01285-x\",\"RegionNum\":3,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"POLYMER SCIENCE\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Iranian Polymer Journal","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1007/s13726-024-01285-x","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"POLYMER SCIENCE","Score":null,"Total":0}
Sulfur and nitrogen co-doped carbon quantum dots/polyurethane nanocomposite as a new fluorescent sensor for highly sensitive and selective detection of toxic mercury (II) ions
Here in, new nitrogen and sulfur co-doped carbon quantum dots (N,S-CQDs)/polyurethane (PU) nanocomposites have been prepared as efficiently sensitive and selective fluorescent sensors to detect mercury ions. At first, N,S-CQDs as fluorescent nanoparticles, 1, 2-bis (4-isocyanatophenoxy) ethane and bis (2-hydroxy ethyl) terephthalate (BHET) containing two hydroxyl groups were synthesized. The N,S-CQDS nanoparticles were synthesized through microwave-assisted carbonization of PU wastes at the presence of sulfuric acid and thiourea. Then, new fluorescent polyurethane nanocomposites were synthesized through an in situ polymerization reaction between new fabricated diisocyanate, BHET and 5 and 10% (w/w) of the N,S-CQDs nanoparticles. The N,S-CQDs/PU-a (6a) and N,S-CQDs/PU-b (6b) nanocomposites containing 5 and 10% (w/w) of fluorescent nanoparticles showed a broad concentration range of 0–250 and 0–200 µM of mercury ions with quenching efficiencies (η) of 95% and 97%, respectively. The limit of detection (LOD), limit of quenching (LOQ), and quenching constant (Ksv) of two nanocomposites were calculated. According to the obtained results, the N,S-CQDs/PU-b nanocomposite (6b) exhibited better performance in Hg+2 sensing because of lower LOD and LOQ and higher Ksv at lower concentrations of mercury ions. Therefore, an increase in the fluorescent nanoparticles loaded in the nanocomposite, led to an enhancement of the selectivity of mercury (II) ions and sensitivity to its detection. The N,S-CQDs/PU-b nanocomposite (6b) exhibited the LOD, LOQ, and Ksv values at 2.03 µM, 6.77 µM, and 6694.6 M−1, respectively. So, the synthesized N,S-CQDs/PU-b nanocomposite (6b) is an excellent sensor for mercury ions.
期刊介绍:
Iranian Polymer Journal, a monthly peer-reviewed international journal, provides a continuous forum for the dissemination of the original research and latest advances made in science and technology of polymers, covering diverse areas of polymer synthesis, characterization, polymer physics, rubber, plastics and composites, processing and engineering, biopolymers, drug delivery systems and natural polymers to meet specific applications. Also contributions from nano-related fields are regarded especially important for its versatility in modern scientific development.