Carbon dots with dual emission: A versatile sensing platform for rapid assay of Cr (VI)

Jia, Mingyan; Peng, Lulin; Yang, Maohua; Wei, Huangzhao; Mei, Zhang; Wang, Yu

doi:10.1016/j.carbon.2021.05.050

Cited by 64 publications

(26 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As depicted in Figure S4a, the characteristic absorption peaks at 3070 and 3440 cm −1 (O−H), 2985 cm −1 (C−H), 1670 and 1496 cm −1 (COO − ), 1315 cm −1 (CC), and 1198 cm −1 (C−O) reveal that the CD surface is functionalized with abundant carboxyl and hydroxyl groups. 24,27 The zeta potential of the CDs is measured to be −2.19 mV, which can be attributed to the carboxyl group on the surface of CDs. The XPS full-scan spectra (Figure S4b) show that the CDs are comprised of C (284 eV) and O (531 eV) elements.…”

Section: Resultsmentioning

confidence: 99%

Dual-Emission Carbon Dots for Ratiometric Fluorescent Water Sensing, Relative Humidity Sensing, and Anticounterfeiting Applications

Qin

Bai

Huang

et al. 2021

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

We synthesized blue fluorescent carbon quantum dots (CDs) by the solvothermal strategy using 2,5-dihydroxyterephthalic acid as the precursor. The as-prepared CD surfaces contain abundant carboxyl and hydroxyl groups and show excitation-independent emission and excellent chemical stability. Interestingly, with the increment of water contents in organic solvents, the CDs underwent a visual fluorescence color transition from blue to green, which could be attributed to the excited-state intramolecular proton transfer effect via the intermolecular hydrogen bonding between CDs and water. Based on this, we designed an effective ratiometric fluorescence water sensor in organic solvents, which featured self-calibration, visualization, rapid response (<20 s), and high sensitivity (limit of detection = 0.052%, v/v, in ethanol). The smartphone-based quantitative assay was also realized using CD-loaded paper strips through a color processing application and successfully applied to monitor the water content in spirit samples. Humidity sensing was further evaluated through the as-prepared CDs/polymer films. Remarkably, the CDbased sensors were well recyclable both with paper strips and polymer films. The as-prepared CDs also hold great potential for anticounterfeiting.

show abstract

Section: Resultsmentioning

confidence: 99%

Dual-Emission Carbon Dots for Ratiometric Fluorescent Water Sensing, Relative Humidity Sensing, and Anticounterfeiting Applications

Qin

Bai

Huang

et al. 2021

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…The peaks located at 2934, 1734, 1597 and 1215 cm −1 are assigned to the saturated C-H, C=O, C=C and C-O/C-N stretching vibrations, respectively [ 12 ]. The peaks observed at 1368, 1115 and 1033 cm −1 reveal the presence of B-O/B-N, B-OH and C-B functional groups [ 27 , 28 ]. These results suggest the successful co-doping of N and B in the lignin-derived CDs by 3-aminophenylboronic acid, which is also supported by XPS spectra.…”

Section: Resultsmentioning

confidence: 99%

Facile Synthesis of Multi-Emission Nitrogen/Boron Co-Doped Carbon Dots from Lignin for Anti-Counterfeiting Printing

Zhu

2022

Polymers

View full text Add to dashboard Cite

The transformation of lignin with natural aromatic structure into value-added carbon dots (CDs) achieves a win-win situation for low-cost production of novel nanomaterials and reasonable disposal of biomass waste. However, it remains challenging to produce multi-emission CDs from biomass for advanced applications. Herein, a green and facile approach to preparing multi-emission CDs from alkali lignin via N and B co-doping is developed. The obtained N and B co-doped CDs (NB-CDs) show multi-emission fluorescence centers at 346, 428 and 514 nm under different excitations. As the doping amount of N and B increases, the fluorescence emission band gradually shifts to 428 and 514 nm, while that at 346 nm decreases. The fluorescence mechanism is explored through the research of the structure, composition and optical performance of NB-CDs in combination with density functional theory (DFT) calculations. It demonstrates that the effect of doping with B-containing functional groups on the fluorescence emission behavior is multivariate, which may be the crucial contribution to the unique multi-emission fluorescence of CDs. The multi-emission NB-CDs with prominent stability are applied for multilevel anti-counterfeiting printing. It provides a promising direction for the sustainable and advanced application of biomass-derived CDs, and the theoretical results highlight a new insight into the deep understanding of the multi-emission fluorescence mechanism.

show abstract

“…The effects of adsorbent dosage (0.2-2.5 g), pH (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13), contact time (0-180 min), and solution temperature (283-323 K) on Cr (VI) removal were investigated. Kinetics studies were carried out by varying initial Cr (VI) concentrations (1, 5, 10 mg/L), and a water sample was drawn at regular time intervals for the concentration of Cr (VI) measurements.…”

Section: Adsorption Experimentsmentioning

confidence: 99%

“…Hexavalent chromium (Cr (VI)) has been widely applied in petroleum, oil refining, electroplating, tanning, metallurgy, fertilizer, and other industrial processes [1,2]. Over the past two decades in many developing countries, raw water sources have been frequently contaminated by wastewater and solid waste containing Cr (VI) due to abnormal discharge [3].…”

Section: Introductionmentioning

confidence: 99%

Preparation of a Novel Activated Carbon from Cassava Sludge for the High-Efficiency Adsorption of Hexavalent Chromium in Potable Water: Adsorption Performance and Mechanism Insight

Liu

et al. 2021

Water

View full text Add to dashboard Cite

Particularly, because of the leakage risk of metal elements from sludge carbon, little attention has been focused on using sludge activated carbon as an adsorbent for the removal of Cr (VI) from contaminated water sources. Herein, a novel sludge carbon derived from dewatered cassava sludge was synthesized by pyrolysis using ZnCl2 as an activator at the optimal conditions. The prepared sludge activated carbon possessed a large BET surface (509.03 m2/g), demonstrating an efficient removal for Cr (VI). Although the time to reach equilibrium was extended by increasing the initial Cr (VI) concentration, the adsorption process was completed within 3 h. The kinetics of adsorption agreed with the Elovich model. The whole adsorption rate was controlled by both film and intra-particle diffusion. The Cr (VI) removal efficiency increased with elevating temperature, and the adsorption equilibrium process followed the Freundlich isotherm model. The adsorption occurred spontaneously with endothermic nature. The removal mechanism of Cr (VI) on the prepared sludge activated carbon depended highly on solution pH, involving pore filling, electrostatic attraction, reduction, and ion exchange. The trace leakage of metal elements after use was confirmed. Therefore, the prepared sludge activated carbon was considered to be a highly potential adsorbent for Cr (VI) removal from contaminated raw water.

show abstract

Carbon dots with dual emission: A versatile sensing platform for rapid assay of Cr (VI)

Cited by 64 publications

References 35 publications

Dual-Emission Carbon Dots for Ratiometric Fluorescent Water Sensing, Relative Humidity Sensing, and Anticounterfeiting Applications

Dual-Emission Carbon Dots for Ratiometric Fluorescent Water Sensing, Relative Humidity Sensing, and Anticounterfeiting Applications

Facile Synthesis of Multi-Emission Nitrogen/Boron Co-Doped Carbon Dots from Lignin for Anti-Counterfeiting Printing

Preparation of a Novel Activated Carbon from Cassava Sludge for the High-Efficiency Adsorption of Hexavalent Chromium in Potable Water: Adsorption Performance and Mechanism Insight

Contact Info

Product

Resources

About