Quantum dots TiO2 loaded amorphous SiO2 composite photocatalysts: Significant performance enhancement and the effect of SiO2 surface hydroxyl groups

Zhang, Han; Sun, Sijia; Chen, Ying

doi:10.1016/j.jallcom.2023.170700

Cited by 8 publications

(2 citation statements)

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“…Besides, the HR-TEM image in Figure 2c shows that a fringe interval of 3.20 Å corresponds to C-dots (002) and a fringe interval of 3.50 Å corresponds to TiO 2 QDs (101) and TiO 2 OVs (101). 35,36 As a result, the formation of hetero/homojunctions within the TQDs/TOVs/C-dots-1 nanocomposite is affirmed. The concentric rings in the selected area electron diffraction (SAED) image confirm the results of XRD analysis and show the crystalline nature of the TQDs/TOVs/C-dots-1 nanocomposite (Figure 2d).…”

Section: ■ Results and Discussionmentioning

confidence: 80%

Decoration of Carbon Dots on Oxygen-Vacancy-Enriched S-Scheme TiO₂ Quantum Dots/TiO₂ Oxygen Vacancies Photocatalysts: Impressive Quantum-Dot-Sized Photocatalysts for Remediation of Antibiotics, Bacteria, and Dyes

Habibi-Yangjeh,

Pournemati,

Ahmadi

et al. 2024

Langmuir

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Today, cleaning the environment using photocatalytic technology is one of the main research activities. In this study, carbon dots (C-dots) were anchored on oxygen-vacancy-enriched TiO 2 quantum dots (QDs)/TiO 2 oxygen vacancies (OVs) using a facile procedure. The resultant ternary TiO 2 QDs/TiO 2 OVs/C-dots photocatalysts with a quantum dot size of almost 4.55 nm were used for detoxification of aqueous solutions containing four antibiotics and three organic dyes as well as inactivation of two pathogenic bacteria, including Escherichia coli and Staphylococcus aureus, upon visible light. The degradation constant of tetracycline over the optimized TiO 2 QDs/TiO 2 OVs/C-dots nanocomposite reached 714 × 10 −4 min −1 , which was 17.3, 12.1, and 2.92 times higher than TiO 2 QDs, TiO 2 OVs, and TQDs/TOVs (1:1) materials, respectively. Effective separation of electron−hole pairs between TiO 2 QDs and TiO 2 OVs counterparts through decorated C-dots by an established S-scheme system was the main reason for boosted photocatalytic activity. With regard to the facile growth of wheat and lentil seeds in the treated solutions, it is hoped that the TiO 2 QDs/TiO 2 OVs/C-dots nanocomposite with significant stability could be used to clean up wastewaters.

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Section: ■ Results and Discussionmentioning

confidence: 80%

Decoration of Carbon Dots on Oxygen-Vacancy-Enriched S-Scheme TiO₂ Quantum Dots/TiO₂ Oxygen Vacancies Photocatalysts: Impressive Quantum-Dot-Sized Photocatalysts for Remediation of Antibiotics, Bacteria, and Dyes

Habibi-Yangjeh,

Pournemati,

Ahmadi

et al. 2024

Langmuir

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“…The distance between plates of TiO 2 QDs and Fe 3 S 4 semiconductors was investigated using an HRTEM image, and the results are shown in Figure 2c. The fringe spacing of 3.50 Å corresponds to the (101) plates of TiO 2 QDs, 33 and the fringe spacing of 2.95 Å indexes to the (311) plate of Fe 3 S 4 . 34 The results from the HRTEM analysis match well with the X-ray diffraction (XRD) pattern in the formation of heterojunction in the TiO 2 QDs/Fe 3 S 4 20% nanocomposite.…”

Section: Resultsmentioning

confidence: 99%

TiO₂ Quantum Dots/Fe₃S₄ Heterojunction Nanocomposites for Efficient Ammonia Production through Nitrogen Fixation upon Simulated Sunlight

Pournemati,

Habibi-Yangjeh,

Khataee

2024

ACS Appl. Nano Mater.

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Using semiconductor photocatalysts instead of the traditional Haber−Bosch procedure to produce ammonia is a promising strategy to save energy and prevent environmental pollution. Therefore, finding a suitable photocatalyst with high efficiency and stability has become one of the big challenges of research communities in the field of heterogeneous photocatalysis. Herein, S-scheme TiO 2 quantum dots (QDs)/Fe 3 S 4 heterojunction photocatalysts were synthesized through a hydrothermal route. The nitrogen photofixation measurements exhibited that the TiO 2 QDs/Fe 3 S 4 photocatalysts have excellent activities, where the generation of NH 3 by the optimized nanocomposite reached 16,624 μmol L −1 g −1 upon simulated sunlight. This amount was almost 19.9, 6.30, and 2.85 times as high as those of TiO 2 , TiO 2 QDs, and Fe 3 S 4 photocatalysts, respectively. The promoted photocatalytic ability was devoted to outstanding visiblelight absorption, accelerated segregation of photoinduced electron−hole pairs, and enhanced surface area. The key purpose of this research was the rational design of a photocatalyst based on TiO 2 QDs through a one-pot and facile fabrication procedure, which exhibits admirable performance in the field of photocatalytic nitrogen fixation. Considering the advantages of binary TiO 2 QDs/ Fe 3 S 4 photocatalysts, it is anticipated that this photocatalyst could be utilized in solar energy conversion processes.

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Well-designed submicron rutile pigment heterophase junction photocatalyst via sol-gel method for organic pollutants removal

Ma,

Zhang,

Ding

et al. 2024

J Sol-Gel Sci Technol

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Quantum dots TiO2 loaded amorphous SiO2 composite photocatalysts: Significant performance enhancement and the effect of SiO2 surface hydroxyl groups

Cited by 8 publications

References 50 publications

Decoration of Carbon Dots on Oxygen-Vacancy-Enriched S-Scheme TiO₂ Quantum Dots/TiO₂ Oxygen Vacancies Photocatalysts: Impressive Quantum-Dot-Sized Photocatalysts for Remediation of Antibiotics, Bacteria, and Dyes

Decoration of Carbon Dots on Oxygen-Vacancy-Enriched S-Scheme TiO₂ Quantum Dots/TiO₂ Oxygen Vacancies Photocatalysts: Impressive Quantum-Dot-Sized Photocatalysts for Remediation of Antibiotics, Bacteria, and Dyes

TiO₂ Quantum Dots/Fe₃S₄ Heterojunction Nanocomposites for Efficient Ammonia Production through Nitrogen Fixation upon Simulated Sunlight

Well-designed submicron rutile pigment heterophase junction photocatalyst via sol-gel method for organic pollutants removal

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Quantum dots TiO2 loaded amorphous SiO2 composite photocatalysts: Significant performance enhancement and the effect of SiO2 surface hydroxyl groups

Cited by 8 publications

References 50 publications

Decoration of Carbon Dots on Oxygen-Vacancy-Enriched S-Scheme TiO2 Quantum Dots/TiO2 Oxygen Vacancies Photocatalysts: Impressive Quantum-Dot-Sized Photocatalysts for Remediation of Antibiotics, Bacteria, and Dyes

Decoration of Carbon Dots on Oxygen-Vacancy-Enriched S-Scheme TiO2 Quantum Dots/TiO2 Oxygen Vacancies Photocatalysts: Impressive Quantum-Dot-Sized Photocatalysts for Remediation of Antibiotics, Bacteria, and Dyes

TiO2 Quantum Dots/Fe3S4 Heterojunction Nanocomposites for Efficient Ammonia Production through Nitrogen Fixation upon Simulated Sunlight

Well-designed submicron rutile pigment heterophase junction photocatalyst via sol-gel method for organic pollutants removal

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Product

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Decoration of Carbon Dots on Oxygen-Vacancy-Enriched S-Scheme TiO₂ Quantum Dots/TiO₂ Oxygen Vacancies Photocatalysts: Impressive Quantum-Dot-Sized Photocatalysts for Remediation of Antibiotics, Bacteria, and Dyes

Decoration of Carbon Dots on Oxygen-Vacancy-Enriched S-Scheme TiO₂ Quantum Dots/TiO₂ Oxygen Vacancies Photocatalysts: Impressive Quantum-Dot-Sized Photocatalysts for Remediation of Antibiotics, Bacteria, and Dyes

TiO₂ Quantum Dots/Fe₃S₄ Heterojunction Nanocomposites for Efficient Ammonia Production through Nitrogen Fixation upon Simulated Sunlight