Reduced graphene oxide-supported Ag-loaded Fe-doped TiO<sub>2</sub> for the degradation mechanism of methylene blue and its electrochemical properties

Jaihindh, Dhayanantha Prabu; Chen, Ching-Cheng; Fu, Yen−Pei

doi:10.1039/c7ra13418e

Cited by 53 publications

(16 citation statements)

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“…Also, Jaihindh et al . [99] reported a k app value of 8.7 × 10 −3 min −1 for visible light photocatalytic degradation of MB after 150 min using GO-supported Ag-loaded Fe-doped TiO 2 as photocatalysts. Sohail et al [100] also reported a k app value of 12.2 × 10 −3 min −1 for photocatalytic degradation of MB after 120 min under UV light irradiation using TiO 2 -reduced GO nanoparticles as photocatalyst.…”

Section: Resultsmentioning

confidence: 99%

“…In another study, Yang et al[98] reported a k app value of 3.3 Â 10 23 min 21 for photocatalytic degradation of MB after 180 min using poly-o-phenylenediamine-modified TiO 2 nanocomposites as photocatalysts. Also, Jaihindh et al[99] reported a k app value of 8.7 Â 10 23 min 21 for visible light photocatalytic degradation of MB after 150 min using GO-supported Ag-loaded Fe-doped TiO 2 as photocatalysts. Sohail et al[100] also reported a k app value of 12.2 Â 10 23 min 21 for photocatalytic degradation of MB after 120 min under UV light irradiation using TiO 2 -reduced GO nanoparticles as photocatalyst.…”

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confidence: 99%

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Photocatalytic activity of graphene oxide–TiO ₂ thin films sensitized by natural dyes extracted from Bactris guineensis

et al. 2019

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This study synthesized and characterized composites of graphene oxide and TiO 2 (GO–TiO 2 ). GO–TiO 2 thin films were deposited using the doctor blade technique. Subsequently, the thin films were sensitized with a natural dye extracted from a Colombian source ( Bactris guineensis ). Thermogravimetric analysis, X-ray diffraction, Raman spectroscopy, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and diffuse reflectance measurements were used for physico-chemical characterization. All the samples were polycrystalline in nature, and the diffraction signals corresponded to the TiO 2 anatase crystalline phase. Raman spectroscopy and Fourier transform infrared spectroscopy (FTIR) verified the synthesis of composite thin films, and the SEM analysis confirmed the TiO 2 films morphological modification after the process of GO incorporation and sensitization. XPS results suggested a possibility of appearance of titanium (III) through the formation of oxygen vacancies (O v ). Furthermore, the optical results indicated that the presence of the natural sensitizer and GO improved the optical properties of TiO 2 in the visible range. Finally, the photocatalytic degradation of methylene blue was studied under visible irradiation in aqueous solution, and pseudo-first-order model was used to obtain kinetic information about photocatalytic degradation. These results indicated that the presence of GO has an important synergistic effect in conjunction with the natural sensitizer, reaching a photocatalytic yield of 33%.

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Section: Resultsmentioning

confidence: 99%

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Photocatalytic activity of graphene oxide–TiO ₂ thin films sensitized by natural dyes extracted from Bactris guineensis

et al. 2019

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“…The PL peak located at the 526 nm is related with the shallow trap on surface oxygen vacancies of TiO 2 [59]. It has been clearly found that the PL intensity decreases from sample ST1 to ST3 with increasing Sn content in TiO 2 because of generated electron-hole pair can affect the charge transfer between the interface of Sn and TiO 2 resulting recombination rate is reduced.…”

Section: Resultsmentioning

confidence: 93%

Investigation of metal doped mesoporous TiO2 nanostructures for environmental remediation

Santhi¹,

Harish²,

Navaneethan³

et al. 2021

Preprint

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In the recent past, metal oxides have attracted the researchers because of their applications in energy and environmental application domains. In the present work, hydrothermal technique used to prepared the Sn doped TiO2 nanoparticles and the effect of Sn concentration has been investigated. The structural, morphological, surface composition, optical and photocatalytic behavior were studied. XRD pattern revealed that doping of Sn makes easy transformation of rutile from anatase phase at lower temperature, providing tetragonal structure of rutile of TiO2. TEM analysis showed the formation of nanoparticles with spherical like morphology with good crystallinity. UV-Vis spectra, it is observed that optical absorption edge gets red shifted upon Sn doping and the band gap is found to be 2.6 eV. The photocatalytic activity of the synthesized nanoparticles has been investigated under visible light irradiation. Experimental results suggested that 0.5 wt % of Sn doped nanoparticles have shown to exhibit improved photocatalytic properties.

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“…A small decrease in the peak intensity of nanocomposite can be seen, indicating larger separation of electron and holes. When CeO 2 (electron donor) interacts with rGO, it transfers the excited electrons to the rGO (electron acceptor), which lead to a reduction in the recombination rate of electron‐hole pairs, and therefore a greater number of charge carriers can participate in the photocatalytic degradation of MB and CR dyes …”

Section: Resultsmentioning

confidence: 99%

Tragacanth Hydrogel Integrated CeO₂@rGO Nanocomposite as Reusable Photocatalysts for Organic Dye Degradation

et al. 2020

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Sunlight‐driven photocatalytic degradation has attracted great attention to tackle the issue of water contaminating organic dyes. As a proof of concept, we propose that nanoceria (CeO2) decorated on the surface of reduced graphene oxide (rGO), could effectively degrade pollutant organic dyes namely methylene blue (MB) and congo red (CR), when exposed to sunlight. The formation of as‐synthesized nanocomposite (CeO2@rGO) was monitored using UV‐visible, Fourier transfer infrared (FTIR) and RAMAN spectroscopy, X‐ray diffraction (XRD), Photoluminescence (PL), and Field emission scanning electronic microscopy (FESEM). Time‐dependent dye degradation was observed for up to 5 h and followed Langmuir‐Hinshelwood first‐order kinetics. Notably, at equivalent concentrations (2 mg), CeO2@rGO exhibited enhanced degradation of MB (∼92 %) and CR (∼83 %) dyes when compared to bare CeO2. The photocatalytic efficiency of CeO2@rGO was further enhanced by integrating in a polymer hydrogel fabricated using tragacanth (TG), a natural gum. The hydrogel photocatalyst (CeO2@rGO‐TG) exhibited ∼91 % MB degradation, at half the amount of CeO2@rGO in free form. More importantly, CeO2@rGO‐TG could be easily separated from the dye solution and re‐employed for multiple cycles of degradation.

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Reduced graphene oxide-supported Ag-loaded Fe-doped TiO₂ for the degradation mechanism of methylene blue and its electrochemical properties

Abstract: Graphene oxide-based composites have been developed as cheap and effective photocatalysts for dye degradation and water splitting applications.

Cited by 53 publications

References 67 publications

Photocatalytic activity of graphene oxide–TiO ₂ thin films sensitized by natural dyes extracted from Bactris guineensis

Photocatalytic activity of graphene oxide–TiO ₂ thin films sensitized by natural dyes extracted from Bactris guineensis

Investigation of metal doped mesoporous TiO2 nanostructures for environmental remediation

Tragacanth Hydrogel Integrated CeO₂@rGO Nanocomposite as Reusable Photocatalysts for Organic Dye Degradation

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Reduced graphene oxide-supported Ag-loaded Fe-doped TiO2 for the degradation mechanism of methylene blue and its electrochemical properties

Abstract: Graphene oxide-based composites have been developed as cheap and effective photocatalysts for dye degradation and water splitting applications.

Cited by 53 publications

References 67 publications

Photocatalytic activity of graphene oxide–TiO 2 thin films sensitized by natural dyes extracted from Bactris guineensis

Photocatalytic activity of graphene oxide–TiO 2 thin films sensitized by natural dyes extracted from Bactris guineensis

Investigation of metal doped mesoporous TiO2 nanostructures for environmental remediation

Tragacanth Hydrogel Integrated CeO2@rGO Nanocomposite as Reusable Photocatalysts for Organic Dye Degradation

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Reduced graphene oxide-supported Ag-loaded Fe-doped TiO₂ for the degradation mechanism of methylene blue and its electrochemical properties

Photocatalytic activity of graphene oxide–TiO ₂ thin films sensitized by natural dyes extracted from Bactris guineensis

Photocatalytic activity of graphene oxide–TiO ₂ thin films sensitized by natural dyes extracted from Bactris guineensis

Tragacanth Hydrogel Integrated CeO₂@rGO Nanocomposite as Reusable Photocatalysts for Organic Dye Degradation