Probing the inhomogeneity and intermediates in the photosensitized degradation of rhodamine B by Ag<sub>3</sub>PO<sub>4</sub> nanoparticles from an ensemble to a single molecule approach

Xu, Bo; Wang, Xiaojuan; Zhu, Chaofeng; Ran, Xia; Li, Tianfeng; Guo, Lijun

doi:10.1039/c7ra07163a

Cited by 23 publications

(7 citation statements)

References 41 publications

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“…3, we demonstrate wide-field lifetime microscopy of Alexa Fluor 532 molecules on glass in a 10 × 10 μm region. The measured lifetimes are consistent with both the ensemble lifetime of 2.5 ns and the large molecular variation seen in similar studies on glass 24,25 . The PC is used in the infinity space of the microscope objective to apply the same Gaussian gating function at t d = 1.6 ns and 15 kHz repetition rate.…”

Section: Resultssupporting

confidence: 89%

Electro-optic imaging enables efficient wide-field fluorescence lifetime microscopy

et al. 2019

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Nanosecond temporal resolution enables new methods for wide-field imaging like time-of-flight, gated detection, and fluorescence lifetime. The optical efficiency of existing approaches, however, presents challenges for low-light applications common to fluorescence microscopy and single-molecule imaging. We demonstrate the use of Pockels cells for wide-field image gating with nanosecond temporal resolution and high photon collection efficiency. Two temporal frames are obtained by combining a Pockels cell with a pair of polarizing beam-splitters. We show multi-label fluorescence lifetime imaging microscopy (FLIM), single-molecule lifetime spectroscopy, and fast single-frame FLIM at the camera frame rate with 103–105 times higher throughput than single photon counting. Finally, we demonstrate a space-to-time image multiplexer using a re-imaging optical cavity with a tilted mirror to extend the Pockels cell technique to multiple temporal frames. These methods enable nanosecond imaging with standard optical systems and sensors, opening a new temporal dimension for wide-field low-light microscopy.

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Section: Resultssupporting

confidence: 89%

Electro-optic imaging enables efficient wide-field fluorescence lifetime microscopy

et al. 2019

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“…Apart from the gradual decrease in absorbance intensity with time, the peaks shifted gradually towards the blue region (left) of the visible spectrum as the illumination time lengthened. This was in congruent with the reported studies on the photodegradation of RhB catalyzed by g-C 3 N 4 /g-C 3 N 4 homojunction systems, Ag 3 PO 4 nanoparticles and Ag 3 VO 4 /β-Ag 3 VO 4 nanocomposites(Gao et al, 2017;Xu et al, 2017;Phang et al, 2020a). Besides, the left-shifted peaks signi ed the generation of deethylated intermediates as the chromophores and aromatic rings of the RhB dye undergone deconstruction(Li et al, 2008;Chiu et al, 2019) 3.3 Photoelectrochemical and PL analysisTo further study the charge migration behavior and separation of photo-generated electron-hole pairs across the interface of BCQD/CN photocatalyst, transient photocurrent response and Mott-Schottky plots were also constructed.…”

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confidence: 92%

Synergistic effects of the hybridization between boron-doped carbon quantum dots and n/n-type g-C3N4 homojunction for boosted visible-light photocatalytic activity

Phang

Lee

Wong

et al. 2022

Environ Sci Pollut Res

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Carbon quantum dots (CQDs) are particularly sought after for their highly tailorable photoelectrochemical and optical properties. Simultaneously, graphitic carbon nitride (g-C 3 N 4 ) has also gained widespread attention due to its suitable band gap energy as well as excellent chemical and thermal stabilities. Herein, a novel boron-doped CQD (BCQD) hybridized g-C 3 N 4 homojunction (CN) nanocomposite was rationally engineered and fabricated via a facile hydrothermal route. The optimal photocatalyst sample, 1-BCQD/CN (with a 1:3 mass ratio of boron to CQD) accomplished a Rhodamine B (RhB) degradation e ciency of 97.0 % within 4 hours under low-powered LED light irradiation. The kinetic rate constant of 1.39 x 10 -2 min -1 achieved by the optimum sample was found to be 3.6-and 2.8-folds higher than that of pristine CN and un-doped CQD/CN, respectively. Furthermore, 1-BCQD/CN demonstrated remarkable stability, where it retained close to 99.0% of its initial photocatalytic e ciency after three consecutive cycles. The marked improvement in photocatalytic performance of 1-BCQD/CN was attributed to several concomitant factors such as enhanced electron migration from CN to BCQD, suppressed electron-hole recombination and signi cantly higher charge density in facilitating charge migration. Based on the scavenging tests, it was revealed that the photogenerated holes (h + ), superoxide anions (•O 2 -) and hydroxyl radicals (•OH) were the primary reactive species responsible for the photodegradation process.Overall, the highly e cient 1-BCQD/CN composite with excellent photocatalytic activity could provide a cost-effective and robust means for addressing the increasing concerns over global environmental pollution.

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“…Special care is, therefore, necessary in order to represent accurate photodegradation efficiency. As shown in Figure 1a, a typical example can be found for RhB photodegradation on Ag 3 PO 4 nanoparticles [31]. The blueshift of the absorption band from 554 to 530 nm was caused by the de-ethylation of RhB molecules.…”

Section: Absorption Peak Shift Of Dye Moleculesmentioning

confidence: 87%

Mechanistic Insights into Photodegradation of Organic Dyes Using Heterostructure Photocatalysts

et al. 2019

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Due to its low cost, environmentally friendly process, and lack of secondary contamination, the photodegradation of dyes is regarded as a promising technology for industrial wastewater treatment. This technology demonstrates the light-enhanced generation of charge carriers and reactive radicals that non-selectively degrade various organic dyes into water, CO2, and other organic compounds via direct photodegradation or a sensitization-mediated degradation process. The overall efficiency of the photocatalysis system is closely dependent upon operational parameters that govern the adsorption and photodegradation of dye molecules, including the initial dye concentration, pH of the solution, temperature of the reaction medium, and light intensity. Additionally, the charge-carrier properties of the photocatalyst strongly affect the generation of reactive species in the heterogeneous photodegradation and thereby dictate the photodegradation efficiency. Herein, this comprehensive review discusses the pseudo kinetics and mechanisms of the photodegradation reactions. The operational factors affecting the photodegradation of either cationic or anionic dye molecules, as well as the charge-carrier properties of the photocatalyst, are also fully explored. By further analyzing past works to clarify key active species for photodegradation reactions and optimal conditions, this review provides helpful guidelines that can be applied to foster the development of efficient photodegradation systems.

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Probing the inhomogeneity and intermediates in the photosensitized degradation of rhodamine B by Ag₃PO₄ nanoparticles from an ensemble to a single molecule approach

Abstract: This work reports the single-molecule observations of the photosensitized process and intermediates generation in the photodegradation of RhB by Ag3PO4 nanoparticles.

Cited by 23 publications

References 41 publications

Electro-optic imaging enables efficient wide-field fluorescence lifetime microscopy

Electro-optic imaging enables efficient wide-field fluorescence lifetime microscopy

Synergistic effects of the hybridization between boron-doped carbon quantum dots and n/n-type g-C3N4 homojunction for boosted visible-light photocatalytic activity

Mechanistic Insights into Photodegradation of Organic Dyes Using Heterostructure Photocatalysts

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Probing the inhomogeneity and intermediates in the photosensitized degradation of rhodamine B by Ag3PO4 nanoparticles from an ensemble to a single molecule approach

Abstract: This work reports the single-molecule observations of the photosensitized process and intermediates generation in the photodegradation of RhB by Ag3PO4 nanoparticles.

Cited by 23 publications

References 41 publications

Electro-optic imaging enables efficient wide-field fluorescence lifetime microscopy

Electro-optic imaging enables efficient wide-field fluorescence lifetime microscopy

Synergistic effects of the hybridization between boron-doped carbon quantum dots and n/n-type g-C3N4 homojunction for boosted visible-light photocatalytic activity

Mechanistic Insights into Photodegradation of Organic Dyes Using Heterostructure Photocatalysts

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Probing the inhomogeneity and intermediates in the photosensitized degradation of rhodamine B by Ag₃PO₄ nanoparticles from an ensemble to a single molecule approach