Laponite immobilized TiO2 catalysts for photocatalytic degradation of phenols

Gombos, Erzsébet; Krakkó, Dániel; Záray, Gyula; Illés, Ádám; Dóbé, Sándor; Szegedi, Ágnes

doi:10.1016/j.jphotochem.2019.112045

Cited by 15 publications

(6 citation statements)

References 27 publications

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“…Pure In 2 S 3 shows several diffraction peaks at 14.21, 23.35, 27.41, 28.64, 33.18, 36.28, 40.91, 43.61, 47.74, 50.11, 53.73, 55.90, 56.61, 59.47, 61.42, 64.72, and 66.62°, indexed to (111), (220), (311), (222), (400), (331), (422), (511), (440), (531), (620), (533), (622), (444), (711), (642), and (731) crystal planes of cubic β-In 2 S 3 (PDF 84-1385), respectively. , As shown in Figure a, pure Lap has a broad peak at ∼6.76°, which gives a basal spacing of 1.30 nm by Bragg’s Law. Further peaks were observed at 19.70, 28.04, 35.15, 53.52, and 60.85°, corresponding to the planes (02,11), (005), (20,13), (24,31), and (060) of Lap (PDF 009-0031), respectively. , …”

Section: Results and Discussionsupporting

confidence: 53%

“…Further peaks were observed at 19.70, 28.04, 35.15, 53.52, and 60.85°, corresponding to the planes (02,11), (005), (20,13), (24,31), and (060) of Lap (PDF 009-0031), respectively. 54,55 The peaks attributed to the (400) and (511) planes of In 2 S 3 in IS-LAP samples become markedly weaker and disappear with increasing CPC (Figure 4b). As noted above, the loss of the (400) peak in the XRD spectra with increasing CPC is also observed via HRTEM; while the (400) lattice fringe was observed for pure In 2 S 3 (Figure 2f), it was not observed for IS-LAP samples (Figure 2b,d).…”

Section: ■ Results and Discussionmentioning

confidence: 98%

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Few-Layer In₂S₃ in Laponite Interlayers: A Colloidal Route Toward Heterostructured Nanohybrids with Enhanced Photocatalysis

2020

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2D nanomaterials are emerging rapidly because of their exceptional chemical and physical properties. Reducing the thickness or number of crystalline layers improves the catalytic performance of many semiconductors, and thus, different exfoliation strategies have been proposed. However, many exfoliation methods can cause damage or chemical modifications, and control over size and aggregation can be problematic. Herein, In2S3 was grown in the surfactant-modified interlayer space of the layered silicate clay Laponite, leading to a hybrid nanostructure containing 1–1.5 nm thick lamellae of In2S3. The synthetic parameters varied the thickness and regularity of the In2S3 layers, and drastic changes in photophysical properties were observed, underlining the importance of colloidal interactions for templated growth. Photocurrent measurements and photocatalysis experiments showed that more than an order of magnitude increased apparent quantum efficiency and internal photon to current conversion efficiency over In2S3. This was attributed to fast interfacial charge transfer, enhanced redox capability, and improved charge transport properties of the In2S3 layers because of reduced layer thickness and isolation by magnesiosilicate nanoclay in between. Overall, this study provides a simple colloidal approach to grow defined layered heterostructures of In2S3 with limited thickness and enhanced photophysical properties, allowing improved catalysis. The photocatalytic enhancement, facile synthesis, and increased product yield compared with pure In2S3 make these promising materials for energy conversion and environmental remediation.

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Section: Results and Discussionsupporting

confidence: 53%

Section: ■ Results and Discussionmentioning

confidence: 98%

Few-Layer In₂S₃ in Laponite Interlayers: A Colloidal Route Toward Heterostructured Nanohybrids with Enhanced Photocatalysis

2020

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“…The position of the peak ascribed to the (110) plane of ZnIn 2 S 4 also shifts for ZIS-Lap toward an angle that fits tetragonal In 2 S 3 as well; however, the breadth of this peak and the overlap with ZnIn 2 S 4 and ZnS give less clarity than the prior case (Figure e). The addition of 0.2 mmol of Mg also results in peaks at 19.70, 35.15, and 60.85°, corresponding to the (02,11), (20,13), and (060) planes of Lap (PDF 009-0031), respectively. , Interestingly, the peaks corresponding to Lap appear clearly with 0.2 mmol of Mg 2+ but diminish with decreasing Mg 2+ concentration, suggesting that increased Mg 2+ improves Lap stability at low concentrations (Figure c).…”

Section: Results and Discussionmentioning

confidence: 91%

Few-Layer ZnIn₂S₄/Laponite Heterostructures: Role of Mg²⁺ Leaching in Zn Defect Formation

Liu¹,

Jatav²,

Herber³

et al. 2021

Langmuir

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Designing nanostructures with extended light absorption via defect engineering is a useful approach for the synthesis of efficient photocatalysts. Herein, ZnIn 2 S 4 was grown hydrothermally in the modified interlayer space of Laponite, resulting in lamellae consisting of Zn-defective ZnIn 2 S 4 several unit cells thick. In the process it was found that Mg 2+ leached from Laponite during synthesis led to the formation of Zn defects in ZnIn 2 S 4 . This resulted in nanohybrids with light absorption extended across the visible spectrum and in improved charge transfer due to the layered structure formed via confined growth. Compared with pure ZnIn 2 S 4 , Zn-defective ZnIn 2 S 4 -Laponite hybrids have increased photocurrent generation and photocatalytic performance. The leaching of Mg 2+ and the resulting formation of Zn defects was attenuated by addition of 4 mM Mg 2+ to the reaction, due to a combination of shifting of the equilibrium of Mg 2+ leaching toward stability, and increased ionic strength. In summary, this work demonstrates the growth of ∼1 nm thick lamellae of ZnIn 2 S 4 , presents a unique strategy to generate cation defects in nanomaterials and the mechanism behind it, and also provides an approach to mitigate Mg 2+ leaching in such syntheses.

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“…87-1526) [31]. Hectorite has diffraction peaks of 2θ approximately at 19.6, 28.0, 35.1, 53.3, 61.0 and 72.3 • according to references [32,33]. The widened reflections indicate low crystallinity and small particle size.…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

Facile Synthesis of g-C3N4/TiO2/Hectorite Z-Scheme Composite and Its Visible Photocatalytic Degradation of Rhodamine B

et al. 2020

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A novel g-C3N4/TiO2/hectorite Z-scheme composites with oxygen vacancy (Vo) defects and Ti3+ were synthesized by so-gel method and high temperature solid phase reaction. This composite exhibited high visible photo-catalytic degradation of rhodamine B (RhB). The apparent rate constant of g-C3N4/TiO2/hectorite was 0.01705 min−1, which is approximately 5.38 and 4.88 times that of P25 and g-C3N4, respectively. The enhancement of photo-catalytic efficiency of the composites can be attributed to the great light harvesting ability, high specific surface area and effective separation of electrons(e−) and holes(h+). The F element from Hectorite causes the formation of Vo and Ti3+ in TiO2, making it responsive to visible light. The effective separation of e− and h+ mainly results from Z-scheme transfer of photo-produced electrons in g-C3N4/TiO2 interface. The composites can be easily recycled and the degradation rate of the RhB still reached 84% after five cycles, indicating its good reusability.

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Laponite immobilized TiO2 catalysts for photocatalytic degradation of phenols

Cited by 15 publications

References 27 publications

Few-Layer In₂S₃ in Laponite Interlayers: A Colloidal Route Toward Heterostructured Nanohybrids with Enhanced Photocatalysis

Few-Layer In₂S₃ in Laponite Interlayers: A Colloidal Route Toward Heterostructured Nanohybrids with Enhanced Photocatalysis

Few-Layer ZnIn₂S₄/Laponite Heterostructures: Role of Mg²⁺ Leaching in Zn Defect Formation

Facile Synthesis of g-C3N4/TiO2/Hectorite Z-Scheme Composite and Its Visible Photocatalytic Degradation of Rhodamine B

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Laponite immobilized TiO2 catalysts for photocatalytic degradation of phenols

Cited by 15 publications

References 27 publications

Few-Layer In2S3 in Laponite Interlayers: A Colloidal Route Toward Heterostructured Nanohybrids with Enhanced Photocatalysis

Few-Layer In2S3 in Laponite Interlayers: A Colloidal Route Toward Heterostructured Nanohybrids with Enhanced Photocatalysis

Few-Layer ZnIn2S4/Laponite Heterostructures: Role of Mg2+ Leaching in Zn Defect Formation

Facile Synthesis of g-C3N4/TiO2/Hectorite Z-Scheme Composite and Its Visible Photocatalytic Degradation of Rhodamine B

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Few-Layer In₂S₃ in Laponite Interlayers: A Colloidal Route Toward Heterostructured Nanohybrids with Enhanced Photocatalysis

Few-Layer In₂S₃ in Laponite Interlayers: A Colloidal Route Toward Heterostructured Nanohybrids with Enhanced Photocatalysis

Few-Layer ZnIn₂S₄/Laponite Heterostructures: Role of Mg²⁺ Leaching in Zn Defect Formation