Solid phase synthesis of nitrogen and phosphor co-doped carbon quantum dots for sensing Fe3+ and the enhanced photocatalytic degradation of dyes

Guo, Yongming; Cao, Fengpu; Li, Yabo

doi:10.1016/j.snb.2017.08.104

Cited by 101 publications

(30 citation statements)

References 38 publications

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“…Furthermore, the fluorescence of quinine sulfate was greatly quenched (Figure ) . The changed UV‐visible absorption spectra revealed that the fluorescence quenching mechanism of quinine sulfate caused by halide ions is a static quenching process . Therefore, the halide ions‐caused fluorescence quenching mechanism of quinine sulfate varied with halide ions.…”

Section: Resultsmentioning

confidence: 98%

“…Quinine is a type of medicine, which has been used for malaria therapy . To date, quinine sulfate is widely used as a reference to calculate the quantum yield of various fluorescent materials . In analytical chemistry experiments, quinine sulfate is also applied to model fluorescent molecules to study the molecular fluorescence owing to the high quantum yield and good solubility in water .…”

Section: Introductionmentioning

confidence: 99%

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Studies of the effect of halide ions on the fluorescence of quinine sulfate

et al. 2019

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The effect of halide ions (Cl − , Br − and I − ) on the fluorescence of quinine sulfate in dilute sulfuric acid solution was studied by fluorescence spectra, ultraviolet-visible (UV-visible) absorption spectra and fluorescence decay technique. The results exhibited that halide ions with heavier atomic mass could significantly reduce the fluorescence intensity of quinine sulfate, as a result, the order of fluorescence quenching caused by halide ions is Cl − < Br − < I − . Therefore, halide ions with high concentration could seriously quench the fluorescence of quinine sulfate. The UVvisible absorption spectra and fluorescence decay technique revealed that the fluorescence quenching of quinine sulfate caused by halide ions was attributed to dynamic quenching, static quenching process, self-quenching fluorescence effect and electronic transfer.

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Studies of the effect of halide ions on the fluorescence of quinine sulfate

et al. 2019

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“…Recently, extensive studies have been focused on CDs as potential nanosensors for the detection of free Fe 3+ ions in water systems because Fe 3+ ions easily form insoluble Fe(OH) 3 in the neutral physiological environment and are extremely difficult to be assimilated by the human body. Therefore, understanding CDs‘ luminescence behavior and their use in the analysis of Fe 3+ ions is of great value in environmental monitoring and clinical research [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Luminescence Mechanism of Carbon Dots by Tailoring Functional Groups for Sensing Fe3+ Ions

Liu

Yuan

et al. 2018

Nanomaterials

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In this paper, spherical carbon dots (CDs) with distinct compositions and surface states have been successfully synthesized by a facile microwave method. From the fluorescence spectra, several characteristic luminescence features have been observed: surface amino groups are dominant in the whole emission spectra centering at 445 nm, and the fingerprint emissions relevant to the impurity levels formed by some groups related to C and N elements, including C-C/C=C (intrinsic C), C-N (graphitic N), N-containing heterocycles (pyridine N) and C=O groups, are located around 305 nm, 355 nm, 410 nm, and 500 nm, respectively. Those fine luminescence features could be ascribed to the electron transition among various trapping states within the band structure caused by different chemical bonds in carbon cores, or functional groups attached to the CDs’ surfaces. According to the theoretical calculations and experimental results, a scheme of the band structure has been proposed to describe the positions of those trapping states within the band gap. Additionally, it has also been observed that the emission of CDs is sensitive to the concentration of Fe3+ ions with a linear relation in the range of Fe3+ concentration from 12.5 to 250 μM.

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“…S3 †), which is higher than that of many reported studies. 8,10,24,33 The high quantum yield may be benecial to enhance the sensitivity of the detection of metal ions.…”

Section: Spectral Properties Of the Pure Cqdsmentioning

confidence: 99%

“…9 Guo et al (2018) successfully applied nitrogen and phosphor co-doped CQDs as chemosensor for detection of Fe(III) ions. 10 The CQDs or QDs have also recently been used for uorescent-sensing of Mn(VII) and Cr(VI). Deng et al (2017) established a method using phosphorescent Lcysteine modied manganese-doped zinc sulde QDs to detect Mn(VII) anions, 7 with a detection limit of 0.24 mmol L À1 .…”

Section: Introductionmentioning

confidence: 99%