High quantum yield graphene quantum dots decorated TiO2 nanotubes for enhancing photocatalytic activity

Qu, Ailan; Xie, Haolong; Xu, Xinmei; Zhang, Yangyu; Wen, Shengwu; Cui, Yifan

doi:10.1016/j.apsusc.2016.03.077

Cited by 138 publications

(43 citation statements)

References 92 publications

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“…The FTIR spectrum is shown in Figure b. The common characteristic absorption peaks of the three samples at 3427,1631, and 1384 cm −1 can be assigned, respectively, to the O−H groups, −OH characteristic peak, and C−H bending modes of the methyl groups . Thus, it is believed that the surfaces of the original TiO 2 nanosheets prepared by the hydrothermal method possess some residual groups after washing as well as the TiO 2 /GQDs and Ti 3+ ‐TiO 2 /GQDs products.…”

Section: Resultsmentioning

confidence: 99%

“…[19,28] The FTIR spectrum is shown in Figure 3b.The common characteristic absorption peaks of the three samples at 3427,1631, and 1384 cm À1 can be assigned,r espectively,t ot he OÀH groups, ÀOH characteristic peak, and CÀHb ending modes of the methyl groups. [29,30] Thus, it is believed that the surfaces of the original TiO 2 nanosheets prepared by the hydrothermal methodp ossess some residual groups after washing as well as the TiO 2 /GQDs and Ti 3 + -TiO 2 /GQDs products. With the distinctive FTIR spectrum of TiO 2 /GQDs, the typical bands at 1770, 1716, and 1384 cm À1 associated with the skeletal vibrations of C=Cb onds, CÀOH, and CÀO, respectively,i ndicatet he presence of GQDsi nt he composites with some carbonaceous groups attached on the surface.…”

Section: Resultsmentioning

confidence: 99%

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Carbothermal Reduction Induced Ti³⁺ Self‐Doped TiO₂/GQD Nanohybrids for High‐Performance Visible Light Photocatalysis

Tang

Liu

et al. 2018

Chemistry A European J

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A facile calcination method is developed for the in situ synthesis of nanohybrids of Ti self-doped TiO /graphene quantum dot nanosheets (Ti -TiO /GQD NSs). Ti sites are formed on the surface of the TiO nanosheets through carbothermal reduction by GQDs, using citric acid as a carbon source. Such heterojunctions exhibit enhanced visible-light absorption properties, large photocurrent current densities, and low recombination of photoinduced carriers. The methylene blue (MB) and rhodamine B (RhB) photodegradation result demonstrates a higher visible-light photocatalysis performance than that of the original TiO . On one hand, inducing Ti sites is efficient for the separation of photogenerated charge carriers and for reducing electron-hole pair recombination. On the other hand, GQDs are beneficial for generating more photocurrent carriers and facilitating the charge transfer across the TiO surface. It is proposed that Ti sites and GQDs induced in TiO nanosheets have a synergistic effect, leading to excellent photocatalysis properties. Finally, a theoretical calculation is provided of the carbothermal reduction for the formation mechanism of the Ti defect sites.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Carbothermal Reduction Induced Ti³⁺ Self‐Doped TiO₂/GQD Nanohybrids for High‐Performance Visible Light Photocatalysis

Tang

Liu

et al. 2018

Chemistry A European J

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“…prepared GQDs with up‐conversion properties and the heterojunction of GQDs/TiO 2 nanotubes by the hydrothermal method. The composite could degrade methyl orange under UV‐vis light irradiation …”

Section: Introductionmentioning

confidence: 99%

“…The composite could degrade methyl orange under UV-vis light irradiation. [49] Herein, we reported the fabrication of an effective GQDs/ TNSs composite photocatalystt hrough af acile electrostatic flocculation route. The decoration of GQDs on TNSs harvested much more visible light and the interface promoted the separation ratio of photoexcited carriers.…”

Section: Introductionmentioning

confidence: 99%

Graphene Quantum Dots Decorated Titania Nanosheets Heterojunction: Efficient Charge Separation and Enhanced Visible‐Light Photocatalytic Performance

Bian

Zhou

et al. 2017

ChemCatChem

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Titania nanosheets (TNSs) are of importance for photocatalytic application owing to the unique two‐dimensional (2D) morphology, high crystallinity and plentiful surface charge. However, the large band gap prohibited the efficient utilization of sun light. Herein, we employed graphene quantum dots (GQDs) as green photocatalytic promoter to decorate TNSs during the electrostatic flocculation. The obtained GQDs/TNSs heterojunction was systematically characterized, and the results demonstrated that the composite exhibited an intimate coupling of GQDs and TNSs, a markedly visible light absorption and therefore the enhanced separation efficiency of photogenerated charges. This composite photocatalyst shows enhanced photocatalytic performance for the photodegradation of Rhodamine B (RhB) under visible light irradiation in comparison with pure restacked TNSs (rs‐TNSs) and GQDs. Furthermore, this composite exhibited a superior reusability, and a high degradation ratio about 90 % was still achieved in the 5th cycle. Moreover, a possible mechanism was proposed and superoxide radicals, holes and hydroxyl radicals were determined as the active species.

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“…Though the diffraction peak of NGQDs was not observed in the composites, which might be due to the relatively low diffraction intensity of NGQDs, the peak attributed to the {101} facet of anatase decreased obviously. The possible reason is that the {002} crystal orientation in NGQDs influenced the {101} surface of TiO2, thus leading to decrease of the peak [31]. Figure S2.…”

Section: Structural Characterizationmentioning

confidence: 99%

Facet-Dependent Interfacial Charge Transfer in TiO2/Nitrogen-Doped Graphene Quantum Dots Heterojunctions for Visible-Light Driven Photocatalysis

Lyu

et al. 2019

Catalysts

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Interfacial charge transfer is crucial in the efficient conversion of solar energy into fuels and electricity. In this paper, heterojunction composites were fabricated, comprised of anatase TiO2 with different percentages of exposed {101} and {001} facets and nitrogen-doped quantum dots (NGQDs) to enhance the transfer efficiency of photo-excited charge carriers. The photocatalytic performances of all samples were evaluated for RhB degradation under visible light irradiation, and the hybrid containing TiO2 with 56% {001} facets demonstrated the best photocatalytic activity. The excellent photoactivity of TiO2/NGQDs was owed to the synergistic effects of the following factors: (i) The unique chemical features of NGQDs endowed NGQDs with high electronic conductivities and provided its direct contact with the TiO2 surface via forming Ti–O–C chemical bonds. (ii) The co-exposed {101} and {001} facets were beneficial for the separation and transfer of charge carriers in anatase TiO2. (iii) The donor-acceptor interaction between NGQDs and electron-rich {101} facets of TiO2 could remarkably enhance the photocurrent, thus hindering the charge carriers recombination rate. Extensive characterization of their physiochemical properties further showed the synergistic effect of facet-manipulated electron-hole separation in TiO2 and donor-acceptor interaction in graphene quantum dots (GQDs)/TiO2 on photocatalytic activity.

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High quantum yield graphene quantum dots decorated TiO2 nanotubes for enhancing photocatalytic activity

Cited by 138 publications

References 92 publications

Carbothermal Reduction Induced Ti³⁺ Self‐Doped TiO₂/GQD Nanohybrids for High‐Performance Visible Light Photocatalysis

Carbothermal Reduction Induced Ti³⁺ Self‐Doped TiO₂/GQD Nanohybrids for High‐Performance Visible Light Photocatalysis

Graphene Quantum Dots Decorated Titania Nanosheets Heterojunction: Efficient Charge Separation and Enhanced Visible‐Light Photocatalytic Performance

Facet-Dependent Interfacial Charge Transfer in TiO2/Nitrogen-Doped Graphene Quantum Dots Heterojunctions for Visible-Light Driven Photocatalysis

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High quantum yield graphene quantum dots decorated TiO2 nanotubes for enhancing photocatalytic activity

Cited by 138 publications

References 92 publications

Carbothermal Reduction Induced Ti3+ Self‐Doped TiO2/GQD Nanohybrids for High‐Performance Visible Light Photocatalysis

Carbothermal Reduction Induced Ti3+ Self‐Doped TiO2/GQD Nanohybrids for High‐Performance Visible Light Photocatalysis

Graphene Quantum Dots Decorated Titania Nanosheets Heterojunction: Efficient Charge Separation and Enhanced Visible‐Light Photocatalytic Performance

Facet-Dependent Interfacial Charge Transfer in TiO2/Nitrogen-Doped Graphene Quantum Dots Heterojunctions for Visible-Light Driven Photocatalysis

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Carbothermal Reduction Induced Ti³⁺ Self‐Doped TiO₂/GQD Nanohybrids for High‐Performance Visible Light Photocatalysis

Carbothermal Reduction Induced Ti³⁺ Self‐Doped TiO₂/GQD Nanohybrids for High‐Performance Visible Light Photocatalysis