Deciphering photocatalytic degradation of methylene blue by surface-tailored nitrogen-doped carbon quantum dots derived from Kraft lignin

Lu, Hao; Yu, Yuanyuan; Liang, Zhanming; Hou, Hewei; Liu, Xi; Chen, Changzhou; Min, Douyong

doi:10.1016/j.ijbiomac.2023.124958

Cited by 12 publications

(4 citation statements)

References 47 publications

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“…However, when the solution pH was reduced to 3, the fluorescence intensity decreased sharply. The amine and carboxyl groups of CDs have been reported to be easily protonated in acidic solutions, leading to nanoparticle aggregation [49,50]. The fluorescent quenched effect emerges when CDs are aggregated [51].…”

Section: Optical Properties Of Cdsmentioning

confidence: 99%

Portable ratiometric fluorescence detection of Cu²⁺ and thiram

Zhang,

Jia,

Tong

et al. 2024

Methods Appl. Fluoresc.

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Food contaminants pose a danger to human health, but rapid, sensitive and reliable food safety detection methods can offer a solution to this problem. In this study, an optical fiber ratiometric fluorescence sensing system based on carbon dots (CDs) and o-phenylenediamine (OPD) was constructed. The ratiometric fluorescence response of Cu2+ and thiram was carried out by the fluorescence resonance energy transfer (FRET) between CDs and 2,3−diaminophenazine (ox-OPD, oxidized state o-phenylenediamine). The oxidation of OPD by Cu2+ resulted in the formation of ox-OPD, which quenched the fluorescence of CDs and exhibited a new emission peak at 573 nm. The formation of a [dithiocarbamate-Cu2+] (DTC-Cu2+) complex by reacting thiram with Cu2+, inhibits the OPD oxidation reaction triggered by Cu2+, thus turning off the fluorescence signal of OPD-Cu2+. The as-established detection system presented excellent sensitivity and selectivity for the detection of Cu2+ and thiram in the ranges of 1 ∼ 100 μM and 5 ∼ 50 μM, respectively. The lowest detection limits were 0.392 μM for Cu2+ and 0.522 μM for thiram. Furthermore, actual sample analysis indicated that the sensor had the potential for Cu2+ and thiram assays in real sample analysis.

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Section: Optical Properties Of Cdsmentioning

confidence: 99%

Portable ratiometric fluorescence detection of Cu²⁺ and thiram

Zhang,

Jia,

Tong

et al. 2024

Methods Appl. Fluoresc.

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“…In recent years, a diverse range of lignin-derived CQD techniques has been explored to incorporate luminescence properties and charge carriers. NCQDs were hydrothermally prepared using kraft lignin and ethylenediamine, leading to a 96% photocatalytic methylene blue removal under simulated sunlight within 5 h. 15 Nevertheless, the incipient lignin-derived CQDs are still largely inhibited owing to the bottleneck in emitting onefold blue fluorescence. The mechanistic uncertainties in multicolor-emissive CQDs constrain their practical applications and steerable performances, which is an ongoing conundrum in lignin-based CQDs.…”

Section: Introductionmentioning

confidence: 99%

Driving multicolor lignin-based carbon quantum dots into selective metal-ion recognition and photocatalytic antibiotic decomposition

Zhou,

Xu,

Guo

et al. 2024

Green Chem.

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“…However, the process of preparing CQDs often involves aromatization, which makes the preparation process complicated and costly [25]. Lignin, an aromatic biomass material found in various trees, has the ability to emit fluorescence without requiring aromatization, which simplifies the preparation process and reduces energy consumption [26,27]. Furthermore, lignin as a carbon source for CQDs offers numerous advantages, including a rich source, low cost, good biocompatibility, and reduced environmental impact [28,29].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, lignin as a carbon source for CQDs offers numerous advantages, including a rich source, low cost, good biocompatibility, and reduced environmental impact [28,29]. Currently, lignin CQDs are widely used to detect and identify heavy metal ions, antibiotics, and residual pesticides in water [26,30,31]. Lignin CQDs are increasingly being utilized in environmental detection and have a promising future for applications [32,33].…”

Section: Introductionmentioning

confidence: 99%

Preparation of N, Cl Co-Doped Lignin Carbon Quantum Dots and Detection of Microplastics in Water

et al. 2023

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The research on rapid and efficient detection of microplastics in water is still in its early stages. Fluorescence feature recognition represents an important and innovative approach to microplastic detection. While carbon quantum dots have been widely used in various environmental detection methods, their use for detecting microplastics in water environments has been rarely reported. In this study, N and Cl co-doped carbon quantum dots were synthesized via a hydrothermal method. The heteroatom doping process endowed them with blue luminescence properties, and their adsorption for microplastics was improved through the introduction of positive and negative charges and intermolecular forces. By utilizing a combined mechanism of fluorescence and Rayleigh scattering, the detection of polystyrene microplastics with three different particle sizes was achieved. In the detection process, it exhibits excellent light stability. Notably, the nano-polystyrene exhibited a good nonlinear relationship within the range of 0.01 g/L to 0.001 g/L, with R2 values of 0.923 and 0.980 and a detection limit of 0.4 mg/L. These findings provide a novel approach for the detection of nano microplastics.

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Deciphering photocatalytic degradation of methylene blue by surface-tailored nitrogen-doped carbon quantum dots derived from Kraft lignin

Cited by 12 publications

References 47 publications

Portable ratiometric fluorescence detection of Cu²⁺ and thiram

Portable ratiometric fluorescence detection of Cu²⁺ and thiram

Driving multicolor lignin-based carbon quantum dots into selective metal-ion recognition and photocatalytic antibiotic decomposition

Preparation of N, Cl Co-Doped Lignin Carbon Quantum Dots and Detection of Microplastics in Water

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Deciphering photocatalytic degradation of methylene blue by surface-tailored nitrogen-doped carbon quantum dots derived from Kraft lignin

Cited by 12 publications

References 47 publications

Portable ratiometric fluorescence detection of Cu2+ and thiram

Portable ratiometric fluorescence detection of Cu2+ and thiram

Driving multicolor lignin-based carbon quantum dots into selective metal-ion recognition and photocatalytic antibiotic decomposition

Preparation of N, Cl Co-Doped Lignin Carbon Quantum Dots and Detection of Microplastics in Water

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Portable ratiometric fluorescence detection of Cu²⁺ and thiram

Portable ratiometric fluorescence detection of Cu²⁺ and thiram