Facile Fluorescence “Turn on” Sensing of Lead Ions in Water via Carbon Nanodots Immobilized in Spherical Polyelectrolyte Brushes

Tian, Yanhua; Kelarakis, Antonios; Li, Li; Zhao, Fang; Wang, Yunwei; Yang, Qingsong; Ye, Zhishuang; Guo, Xuhong

doi:10.3389/fchem.2018.00470

Cited by 24 publications

(13 citation statements)

References 53 publications

(108 reference statements)

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“…is robust environmental tool (Figure 7) might be helpful in effective monitoring procedures of point source activities and wastewater decontamination before discharge Journal of Analytical Methods in Chemistry into aquatic ecosystems. e results for Pb 2+ ions detected compares well with those obtained from facile fluorescence "turn on" sensing of lead ions in water via carbon nanodots immobilized in spherical polyelectrolyte brushes of 22.8 μM [24]. e difference being that in our case, absorption of the metal ions results in phosphorescence turnoff.…”

Section: Leaching Capacity Of the Intercalated Stilbenesupporting

confidence: 84%

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Trace Metal Detection in Aqueous Reservoirs Using Stilbene Intercalated Layered Rare-Earth Hydroxide Tablets

Omwoma

2020

Journal of Analytical Methods in Chemistry

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Contamination of aquatic reservoirs with metal ions is a slow gradual process that is not easy to detect. Consequences of the metal ions, especially the ones with high atomic numbers (heavy metals) at high concentrations, are severe and irreversible in aquatic reservoirs. As such, early detection mechanisms, especially at trace concentration, are essential for mitigation measures. In this work, a new, robust, and effective tool for trace metal detection and monitoring in aqueous solutions has been developed. Tablets (1 mm thick and similar to medicinal tablets) were manufactured from a powder comprising stilbene intercalated into gallery spaces of lanthanide-containing layered double hydroxides. The tablets were placed in a water column having different concentrations of Pb2+ and Cu2+ ions, and the water was allowed to flow for 45 minutes at a flow rate of 100 ml/s. Thereafter, the tablets were dried and made to powder, and their phosphorescence was measured. The gradual stilbene phosphorescence turnoff in the tablets from various concentrations of metal ions was correlated with sorption amounts. The tablets were able to detect effectively metal ions (up to Pb2+ 1.0 mmol/L and Cu2+ 5.0 mmol/L) in the aqueous media. As such, the concentrations of Pb2+ and Cu2+ ions at trace levels were determined in the test solutions. This method provides a real-time metal ion analysis and does not involve sampling of water samples for analysis in the laboratory.

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Section: Leaching Capacity Of the Intercalated Stilbenesupporting

confidence: 84%

“…Other biosensors exhibit interference from contaminants leading to low response, hence inefficiency. Recently, Tian et al [24] developed a fluorescence "turn on" sensor for Pb 2+ using carbon nanodots immobilized in spherical polyelectrolyte brushes.…”

Section: Introductionmentioning

confidence: 99%

Trace Metal Detection in Aqueous Reservoirs Using Stilbene Intercalated Layered Rare-Earth Hydroxide Tablets

Omwoma

2020

Journal of Analytical Methods in Chemistry

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“…As Cr (VI) has a broad absorption band which can effectively overlap with the emission or excitation spectra of CDs with blue light, the IFE strategy has often been applied to detect Cr(VI) [47,48]. AIEE and CIA are related to the aggregation of CDs caused by temperature, solvent, additives like HMs [49][50][51]. When aggregation happens, the intramolecular motion is restricted, which blocks the nonradiative path and activated radiative decay.…”

Section: Sensing Mechanismmentioning

confidence: 99%

“…Guo et al [51] designed a fluorescence "turn-on" sensing for Pb(II) detection via CDs immobilized in spherical polyelectrolyte brushes (SPBs) with "OFF-ON" response. The fluorescence of CDs was firstly "turned off" via electrostatic interaction induced quenching by SPB, then specifically turned on by the addition of Pb(II) via the aggregation of the SPB particles.…”

Section: Turn-onmentioning

confidence: 99%

Recent advances in fluorescence probes based on carbon dots for sensing and speciation of heavy metals

2020

Nanophotonics

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Heavy metal (HM) pollution is a major global concern. Carbon dots (CDs) have demonstrated unique properties as sensing platforms for HMs detection. This review summarizes the progress made in recent years in fluorescence methods to determine HMs and their species using CDs. First, the strategies to synthesize and purify CDs are reviewed. The photoluminescence principles of CDs and their sensing mechanisms as HMs sensors are then summarized. The binding strategies between CDs and HMs are proposed to provide salient principles to design desirable CD-based HMs sensors. The preparation and merits of “turn-on” and ratiometric CDs for HMs detection with higher accuracy are discussed compared with commonly used “turn-off” sensors. Subsequently, the progress on detecting single HM ions, multi-HMs, and different metal species in solution, and the development of gel/solid-state sensor platforms such as paper-based devices, sensor arrays, hydrogels, polymer films, and ion-imprinted polymers are critically accessed. Furthermore, the advances in the cell, bacterial, plant, and animal bioimaging of HMs with CDs as promising bioimaging reagents are presented. Finally, the challenges and prospects of CDs as HMs sensors in future investigations are discussed.

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“…The system was found to be highly selective and was successfully used to quantify Cu 2+ in spiked tap water and in biological samples. In other work on metal ion detection, C-dots immobilised in spherical polyelectrolyte brushes were found to sensitively and selectively detect the presence of lead ions [88], while a polyaniline/C-dot nanocomposite has been developed as a fluorescent probe to detect mercury [89].…”

Section: Detection Of Heavy Metals and Pesticidesmentioning

confidence: 99%

Carbon Dots for Forensic Applications: A Critical Review

Verhagen

Kelarakis

2020

Nanomaterials

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Owing to their superior fluorescence performance, inexpensive synthesis and nontoxic nature, carbon dots (C-dots) are systematically explored in a variety of applications; in this review, we outline and critically discuss recent trends with respect to their potential exploitation in criminal investigation, forensic toxicology and anti-counterfeit interventions. Capitalising on their colour-tuneable behaviour (in the sense that they adopt different colours with respect to the incident radiation), C-dot-based compositions are ideal for the visual enhancement of latent fingerprints, affording improved contrast against multicoloured and patterned backgrounds. As highly sensitive and highly selective optical nanoprobes, C-dots show excellent analytical performance in detecting biological compounds, drugs, explosives, heavy metals and poisonous reactants. In addition, benefiting from their versatile structural and chemical composition, C-dots can be incorporated into ink and polymeric formulations capable of functioning as a new generation of cost-effective barcodes and security nanotags for object authentication and anti-counterfeit applications. Translating these encouraging research outcomes into real-life innovations with significant social and economic impact requires an open, multidisciplinary approach and a close synergy between materials scientists, biologists, forensic investigators and digital engineers.

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Facile Fluorescence “Turn on” Sensing of Lead Ions in Water via Carbon Nanodots Immobilized in Spherical Polyelectrolyte Brushes

Cited by 24 publications

References 53 publications

Trace Metal Detection in Aqueous Reservoirs Using Stilbene Intercalated Layered Rare-Earth Hydroxide Tablets

Trace Metal Detection in Aqueous Reservoirs Using Stilbene Intercalated Layered Rare-Earth Hydroxide Tablets

Recent advances in fluorescence probes based on carbon dots for sensing and speciation of heavy metals

Carbon Dots for Forensic Applications: A Critical Review

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