Single evaluation and selection of functional groups containing N or O atoms to heavy metal adsorption: Law of electric neutrality.

Zhang, Ming; Hou, Siyu; Li, Yang; Hou, Yuqiu; Yang, Ping

doi:10.1016/j.chemosphere.2021.132207

Cited by 14 publications

(2 citation statements)

References 17 publications

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“…These groups could interact with the added HMIs in forming complexation that causes the quenching. 43 Most current studies reported that the synthesized GQDs, mainly by hydrothermal, microwave-assisted, thermal decomposition, and electrochemical methods, are responsive to only a specific metal ion, frequently Fe 3+ , 44−47 Hg 2+ , 48−50 Cu 2+ , 51−53 Pd 2+ , 54 and Pb 2+ . 55 Because each metal ion features a distinct electron configuration, any change in the type of functional groups on GQDs or their ratio alters the interaction strength between GQDs and metal ions.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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One-Step Synthesis of N-Doped Graphene Quantum Dots via Plasma Contacting Liquid for Multiple Heavy Metal Ion Detection

Thai,

Tran,

Kosugi

et al. 2024

ACS Appl. Nano Mater.

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N doping is crucial to improving the properties of graphene quantum dots (GQDs) and broadening their application. However, the current routes for doping N into GQDs require high pressure, high temperature, and a long time. Here, we reported a simple and fast approach for synthesizing N-doped GQDs from glucosamine via plasma contacting liquid. The synthesis process operated in one step within minutes at atmospheric pressure and temperature lower than 80 °C. The synthesized N-doped GQDs featuring pyrrole, graphitic-N, and pyridine structures were confirmed with XPS, HRTEM, Raman, and FTIR spectroscopy. Our results showed that the atomic ratio of N/C in N-doped GQDs was about 0.14, in which 54% of N atoms doped in GQDs under pyrrole and graphitic-N structures. These N-doped GQDs contained many O-rich functional groups and surface defects such as Stone−Wales disorder and trivacancy defects. We found that N-doped GQDs synthesized via plasma contacting liquid were more sensitive to multiple metal ions than those synthesized by conventional methods. In detail, through the fluorescence quenching observation, we found that N-doped GQDs in this study were responsive to Fe 3+ , Cu 2+ , Pd 2+ , Hg 2+ , Pb 2+ , and Co 2+ . Our results indicated that N-doped GQDs via plasma contacting liquid could be used as fluorescent sensors to detect the presence of heavy metal ions in wastewater or pollutant aqueous environments.

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Section: ■ Results and Discussionmentioning

confidence: 99%

“…N-GQDs in this study feature many functional groups (–COOH, –COH, and amine, as demonstrated in Figures , ). These groups could interact with the added HMIs in forming complexation that causes the quenching …”

Section: Resultsmentioning

confidence: 99%