Mesoporous TiO2 modified with carbon quantum dots as a high-performance visible light photocatalyst

Miao, Ran; Luo, Zhu; Zhong, Wei; Chen, Shengyu; Jiang, Ting; Dutta, Biswanath; Nasr, Youmna; Zhang, Yashan; Suib, Steven L.

doi:10.1016/j.apcatb.2016.01.070

Cited by 219 publications

(80 citation statements)

References 72 publications

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“…[26] Results and Discussion Structure and morphology characterization of products [26] Results and Discussion Structure and morphology characterization of products…”

Section: Introductionmentioning

confidence: 99%

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Graphene Quantum‐Dot‐Modified Hexagonal Tubular Carbon Nitride for Visible‐Light Photocatalytic Hydrogen Evolution

et al. 2018

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Graphene quantum dots were modified on hexagonal tubular carbon nitride to form a composite photocatalyst by freeze‐drying technology. With an optimum loading amount of 0.15 wt % GQDs, the composite photocatalyst exhibits an improved visible‐light photocatalytic performance for hydrogen evolution (112.1 μmol h−1) that is about 9 times higher than that of bulk carbon nitride. During the photocatalytic reaction, graphene quantum dots play a photosensitizer role and an electron reservoir, which can extend the visible‐light response of the photocatalyst, decrease its band gap, and improve the separation efficiency of photoinduced electron–hole pairs. The graphene quantum dots can also absorb the long‐wavelength light and then emit the shorter wavelength light based on its upper transfer luminescence properties, which also contribute to the utilization of visible light. This finding demonstrates that the graphene quantum‐dot modification is a promising method to improve visible‐light photocatalytic activities for traditional photocatalysts.

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“…[26] Results and Discussion Structure and morphology characterization of products [26] Results and Discussion Structure and morphology characterization of products…”

Section: Introductionmentioning

confidence: 99%

“…the visible-light responser ange, leading to enhanced photogenerated electron-hole pairs eparation, and ap ossible mechanism of the improved photocatalytic activity was proposed based on serials of advanced measurements. [26]…”

Section: Introductionmentioning

confidence: 99%

Graphene Quantum‐Dot‐Modified Hexagonal Tubular Carbon Nitride for Visible‐Light Photocatalytic Hydrogen Evolution

et al. 2018

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“…The X-ray diffractograms of the prepared nano-powders are shown in Figure 1. All registered peaks for both synthesized samples calcined at 450 °C (2θ ~ 25.5°, 37.1°; 38.0°; 38.7°; 48.2°; 54.1°; 55.3°; 62.9°; 69.0°; 70.5° for TA10; 2θ ~ 24.7° and 47.9° for TA13) correspond to well-known diffraction peaks of the anatase crystal phase [17,18,19]. In both catalytic samples, a rutile crystal phase was not observed.…”

Section: Structural Propertiesmentioning

confidence: 72%

Decolorisation of methylene blue over titania-based catalysts: The influence of different pH values used in the catalyst preparation procedure

Vasic¹,

Zarubica²

2016

Adv techn

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In this study, nano-sized TiO 2-based powders were synthesized by a modified solgel method. The influence of pH values of the precursor solution during the synthesis process on textural, structural and morphological properties of the titania-based catalysts was investigated. Photocatalytic activity of the prepared titania samples was tested by decolorisation/degradation of Methylene blue (MB) as a model pollutant under UV-A illumination. Finally, in order to optimize the photocatalytic process, the influence of the initial MB dye concentrations was also observed with the use of the catalyst sample synthesized at pH 10. The obtained results indicated a greater effect of the dye decolorisation when the catalyst prepared at pH 10 was used, compared with the catalyst prepared at pH 13. The photocatalytic activity was correlated with physico-chemical properties of the synthesized materials. .

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“…50–52 The photocurrent measured in this system, without a redox couple in solution, corresponds to a net electron transfer from the CNDs to the gold slide electrode; thus the photocurrent is anodic. Figure 4D and Fig.…”

Section: Resultsmentioning

confidence: 96%

A fluorescence-electrochemical study of carbon nanodots (CNDs) in bio- and photoelectronic applications and energy gap investigation

Zeng

Zhang

Arvapalli

et al. 2017

Phys. Chem. Chem. Phys.

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Carbon nanodots (CNDs) have attracted great attention due to their superior solubility, biocompatibility, tunable photoluminescence, and opto-electronic properties. This work describes a new fluorescence-based spectroelectrochemistry approach to simultaneously study the photoluminescence and wavelength dependent photocurrent of microwave synthesized CNDs. The fluorescence of CNDs has a selective quench upon a reversible redox couple, ferricyanide/ferrocyanide,− reaction during the cyclic voltammetry. The CNDs modified gold slide electrode demonstrates wavelength dependent photocurrent generation during the fluorescence-electrochemical study, suggesting potential application in photoelectronics. UV-Vis absorption and electrochemistry are used to quantify the energy gap of the CNDs, and then to calibrate a Hückel model for the CNDs electronic energy levels. The Hückel (or tight binding) model treatment of an individual CND as a molecule combines the conjugated π states (C=C) with the functional groups (C=O, C-O, and COOH) associated with the surface electronic states. This experimental and theoretical investigation of the CNDs provides a new perspective on the optoelectronic properties of CNDs and should aid in their development for practical use in biomedicine, chemical sensing, and photoelectric devices.

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Mesoporous TiO2 modified with carbon quantum dots as a high-performance visible light photocatalyst

Cited by 219 publications

References 72 publications

Graphene Quantum‐Dot‐Modified Hexagonal Tubular Carbon Nitride for Visible‐Light Photocatalytic Hydrogen Evolution

Graphene Quantum‐Dot‐Modified Hexagonal Tubular Carbon Nitride for Visible‐Light Photocatalytic Hydrogen Evolution

Decolorisation of methylene blue over titania-based catalysts: The influence of different pH values used in the catalyst preparation procedure

A fluorescence-electrochemical study of carbon nanodots (CNDs) in bio- and photoelectronic applications and energy gap investigation

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