Hydrothermally activated TiO2 nanoparticles with a C-dot/g-C3N4 heterostructure for photocatalytic enhancement

Chen, Zhongyi; Ji, Tianhao; Xu, Zhemi; Guan, Peiyuan; Jv, Dajian

doi:10.1039/d1na00213a

Cited by 18 publications

(8 citation statements)

References 37 publications

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“…However, because of its large band gap (∼3.2 eV), TiO 2 only absorbs the sunlight in the UV region (<400 nm, 5% of the solar energy), which largely limits its potential commercial use for waste dye degradation. 2,9 To boost the photocatalytic activity of the TiO 2 , researchers have modified TiO 2 with other types of semiconductors or use of other types of semiconductors with narrow band gaps, which can either improve the absorption of the composite or enhance the charge separation. 10−12 For example, Bayat et al reported graphene quantum dot-decorated rutile TiO 2 nanoflowers for water splitting with enhanced photocatalytic properties.…”

Section: Introductionmentioning

confidence: 99%

Room-Temperature Synthesis of Carbon Dot/TiO₂ Composites with High Photocatalytic Activity

et al. 2023

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Benefiting from the wide-range absorption and adjustable energy gap, carbon dots (C-dots) have attracted a great deal of attention and they have been used to sensitize semiconductor nanocomposites to boost the efficiency of energy conversion devices, while there is still a lack of fundamental understanding of the interaction between such materials and their influence on the catalytic activity on the reaction process. In this study, C-dots were used to modify TiO 2 to form a direct Z-scheme (DZS) junction for enhancement of the photocatalytic activity. The C-dot/TiO 2 composite was prepared by ultrasonication at room temperature through coupling between the Ti−O−C bond and electrostatic interaction. The C-dots can dramatically enhance the absorption of the composite by forming the DZS, and the composite is enabled to generate more free radicals, which facilitate ∼10 times higher photocatalytic activity compared to that of TiO 2 . As a proof of concept, the as-prepared C-dot/TiO 2 was used for textile wastewater dye degradation. This study provides an efficient approach for room-temperature preparation of C-dot/TiO 2 composites with high photocatalytic activity.

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Section: Introductionmentioning

confidence: 99%

Room-Temperature Synthesis of Carbon Dot/TiO₂ Composites with High Photocatalytic Activity

et al. 2023

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“…They demonstrated that the composite significantly enhanced photodegradation activity toward organic dyes RhB and MB. 17 Fang et al proposed the composite formed by graphitic carbon nitride/carbon nanodots doped with ferrous ions. They reported that the composite could significantly improve the organic dye removal efficiency under the Haber−Weiss reaction conditions to promote the generation of • OH and HO 2 • (eqs 2 and3).…”

Section: Introductionmentioning

confidence: 99%

“…prepared the composite formed by g-C 3 N 4 /CDs doped with metal oxides. They demonstrated that the composite significantly enhanced photodegradation activity toward organic dyes RhB and MB . Fang et al proposed the composite formed by graphitic carbon nitride/carbon nanodots doped with ferrous ions.…”

Section: Introductionmentioning

confidence: 99%

Degradation of Organic Dyes Using the Ionizing Irradiation Process in the Presence of the CN/CD₃/Fe₆ Composite: Mechanistic Studies

Tao

et al. 2022

ACS Omega

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Organic dyes are ubiquitous pollutants in various aquatic environments as they are produced in abundance and used widely. In the present work, the degradation and mineralization of various organic dyes such as methylene blue (MB), methyl orange (MO), and rhodamine B (RhB), following the electron beam irradiation method in the presence of a graphitic carbon nitride/carbon nanodots/Fe(II) (CN/CD 3 /Fe 6 ) composite, were studied. The removal efficiency of MB reached 81.7% under conditions of electron beam irradiation (EBI) when the total irradiation dose was 5 kGy. This increased to 91.2% in the presence of the CN/CD 3 /Fe 6 composite. The mineralization efficiency increased from 30.1 to 47.3% when the composite was added, and the total irradiation dose was 20 kGy. The removal efficiency of organic dyes was not significantly affected in the pH range of 3–11. Results from cyclic experiments conducted using MB degradation indicated that the CN/CD 3 /Fe 6 composite exhibited good stability and reusability even after five irradiation cycles. Results from scavenging experiments revealed that • OH was the predominant reactive species during the MB degradation process. Intermediates produced in the synergistic system (EBI&CN/CD 3 /Fe 6 system) consisting of the CN/CD 3 /Fe 6 composite and EBI were detected using the liquid chromatography-mass spectrometry (LC-MS) technique. Based on the results, the possible degradation mechanism and pathways for MB were proposed.

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“…Now, it is important to compare the achieved photocurrent with those present in the literature. Chen et al reported a nanocomposite consisting of TiO 2 and C-dot/g-C 3 N 4 shows a maximum photocurrent density of 1.2 μA cm –2 . A ZnO/ZnSnO 3 /C-dot heterojunction has been developed with a maximum photocurrent density of 2.2 μA cm –2 by Nguyen et al…”

Section: Resultsmentioning

confidence: 99%

Tunning of Optoelectronic Properties in Nanohybrids of Peptide-Appended Perylenebisimides and Carbon Nanodots

Hazra

Banerjee

2022

J. Phys. Chem. C

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Two hybrid materials based on carbon dots (C-dots) and two perylenebisimide (PBI)-linked peptides with different functionality have been fabricated. These hybrids are designed to facilitate the electronic interaction between the electron donor C-dots and acceptor PBI-appended peptides, and the optoelectronic properties of these nanohybrids are compared. Amazingly, it is observed that the C-dots have exhibited favorable interactions with the PBI molecule (P1) bearing a similar charge (both negative) and have not shown any electronic interaction with the PBI molecule having opposite charges at their termini (P2). The pH of the medium has been found to be the limiting factor that has inhibited the electronic interaction between C-dots and P2. The interaction between C-dots and P1 has been attributed to the noncovalent complex formation. UV–visible and fluorescence spectroscopic study, field emission gun transmission electron microscopy, and time-correlated single-photon counting studies are made for this purpose. This nanohybrid material shows the emergence of good photoswitching behavior with the highest photocurrent gain of 5.14 (I on/I off) compared to that of only P1 or C-dots. The increase in the photoswitching property is attributed to efficient charge (electron–hole) separation and holds a future promise for fabricating a new nanohybrid material with a high photocurrent conversion efficiency.

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Hydrothermally activated TiO₂ nanoparticles with a C-dot/g-C₃N₄ heterostructure for photocatalytic enhancement

Abstract: Dye degradation via photocatalysis technology has been investigated intensively to tackle environmental issues and energy crisis concerns. In this work, a newly designed ternary photocatalyst was facile prepared by a...

Cited by 18 publications

References 37 publications

Room-Temperature Synthesis of Carbon Dot/TiO₂ Composites with High Photocatalytic Activity

Room-Temperature Synthesis of Carbon Dot/TiO₂ Composites with High Photocatalytic Activity

Degradation of Organic Dyes Using the Ionizing Irradiation Process in the Presence of the CN/CD₃/Fe₆ Composite: Mechanistic Studies

Tunning of Optoelectronic Properties in Nanohybrids of Peptide-Appended Perylenebisimides and Carbon Nanodots

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Hydrothermally activated TiO2 nanoparticles with a C-dot/g-C3N4 heterostructure for photocatalytic enhancement

Abstract: Dye degradation via photocatalysis technology has been investigated intensively to tackle environmental issues and energy crisis concerns. In this work, a newly designed ternary photocatalyst was facile prepared by a...

Cited by 18 publications

References 37 publications

Room-Temperature Synthesis of Carbon Dot/TiO2 Composites with High Photocatalytic Activity

Room-Temperature Synthesis of Carbon Dot/TiO2 Composites with High Photocatalytic Activity

Degradation of Organic Dyes Using the Ionizing Irradiation Process in the Presence of the CN/CD3/Fe6 Composite: Mechanistic Studies

Tunning of Optoelectronic Properties in Nanohybrids of Peptide-Appended Perylenebisimides and Carbon Nanodots

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Hydrothermally activated TiO₂ nanoparticles with a C-dot/g-C₃N₄ heterostructure for photocatalytic enhancement

Room-Temperature Synthesis of Carbon Dot/TiO₂ Composites with High Photocatalytic Activity

Room-Temperature Synthesis of Carbon Dot/TiO₂ Composites with High Photocatalytic Activity

Degradation of Organic Dyes Using the Ionizing Irradiation Process in the Presence of the CN/CD₃/Fe₆ Composite: Mechanistic Studies