Ag-loaded TiO2/reduced graphene oxide nanocomposites for enhanced visible-light photocatalytic activity

Vasilaki, Evangelia; Georgaki, I.; Vernardou, Dimitra; Vamvakaki, Maria; Katsarakis, N.

doi:10.1016/j.apsusc.2015.07.056

Cited by 118 publications

(54 citation statements)

References 42 publications

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“…3 shows the Raman spectra of GO, PRGO and RGO exhibiting various reduction level. 39 These results are in agreement with previously reported studies of the chemical reduction. The D band is assigned to the vibrations of carbon atoms with sp 3 hybridization, whereas the G band is related to the vibration of sp 2 -bonded carbon atoms.…”

Section: Resultssupporting

confidence: 93%

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Elucidation of the function of oxygen moieties on graphene oxide and reduced graphene oxide in the nucleation and growth of silver nanoparticles

et al. 2016

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The goal of the presented investigation was to study the differences in the decoration of graphene sheets, having various amounts of oxygen containing functional groups, with silver nanoparticles (AgNPs). The reduction of graphehe oxide (GO) was performed with the use of ascorbic acid (AA), leading to partiallyreduced graphene oxide (PRGO) and reduced graphene oxide (RGO). The reduction process was monitored and confirmed by Raman Spectroscopy and Fourier Transform -Infrared Spectroscopy (FT-IR). The level of oxygen functional groups in the respective types of graphene was controlled by the duration of the reduction reactions. One-step synthesis of silver nanoparticles (AgNPs) was performed with no additional reducing agents in dark conditions in situ, i.e. directly on the graphene sheets deposited on a silicon wafer. It was proved that the presence of oxygen moieties on the graphene surface provides reactive sites for the spontaneous chemical reduction of Ag + ions. It was also demonstrated that the amount of oxygen moieties on the surface of graphene plays an important role in the nucleation and growth of AgNPs. Moreover, it was found that the number of AgNPs investigated by Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM) increases with the amount of oxygen moieties, while their size decreases. Finally, it was found that the intensity of Raman bands characteristic of graphene are strongly increased for samples with AgNPs, due to surface enhancement Raman scattering (SERS).

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Section: Resultssupporting

confidence: 93%

“…Fig. 39 In comparison with GO, the intensities of the D band of PRGO and RGO increase, resulting in a higher I D /I G ratio than that of GO. Raman spectra of all investigated graphene structures exhibit two typical peaks, at around 1320 cm À1 and 1600 cm À1 , which correspond to the D and G bands, respectively.…”

Section: Resultsmentioning

confidence: 97%

Elucidation of the function of oxygen moieties on graphene oxide and reduced graphene oxide in the nucleation and growth of silver nanoparticles

et al. 2016

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“…In terms of morphologies, Zhang et al fabricated surface-coarsened TiO 2 nanobelts enwrapped with monodispersed Ag nanoparticles and GR nanosheets, but the improved photocatalytic performances still remained in UV light [37]; Gou et al prepared TiO 2 nanofibers/reduced graphene oxide/Ag nanoparticle nanocomposite photocatalysts with UV/Vis response properties, and the electron transfer path was Ag→RGO→TiO 2 under visible light [38]. In another aspect, Vasilaki et al carried out a comprehensive comparison between TiO 2 /Ag/RGO and other photocatalysts including bare TiO 2 , TiO 2 /RGO and even TiO 2 /Ag [39]; Zhang et al utilized the one-pot solvothermal method to synthesize Ag-TiO 2 /reduced graphene oxide (r-GO) nanocomposite with excellent adsorbent capacity, and the Ag-TiO 2 /r-GO nanocomposite displayed enhanced performance toward removal of rhodamine B (Rh B) dyes and reduction of CO 2 [40]. However, few reports formally proposed "the electron-transfer mechanism"; we put forward that a feasible electron transfer route is that Ag nanoparticles deliver the electrons to the conduction band (CB) of mesoporous TiO 2 (MT), following RGO nanosheets that can receive electrons to effectively separate electrons and holes.…”

Section: Introductionmentioning

confidence: 99%

Effective Electron Transfer Pathway of the Ternary TiO2/RGO/Ag Nanocomposite with Enhanced Photocatalytic Activity under Visible Light

et al. 2017

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Abstract:Mesoporous TiO 2 /reduced graphene oxide/Ag (TiO 2 /RGO/Ag) ternary nanocomposite with an effective electron transfer pathway is obtained by an electrostatic self-assembly method and photo-assisted treatment. Compared with bare mesoporous TiO 2 (MT) and mesoporous TiO 2 /RGO (MTG), the ternary mesoporous TiO 2 /RGO/Ag (MTGA) nanocomposite exhibited superior photocatalytic performance for the degradation of methylene blue (MB) under visible light, and the degradation rate reached 0.017 min −1 , which was 3.4-times higher than that of MTG. What is more, the degradation rate of MTGA nanocomposite after three cycle times is 91.2%, and the composition is unchanged. In addition, we found that the OH•, h + and especially O 2•− contribute to the high photocatalytic activity of MTGA for MB degradation. It is proposed that Ag nanoparticles can form the local surface plasmon resonance (LSPR) to absorb the visible light and distract the electrons into MT, and RGO can accept the electrons from MT to accelerate the separation efficiency of photogenerated carriers. The establishment of MTGA ternary nanocomposite makes the three components act synergistically to enhance the photocatalytic performance.

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“…2 shows the FTIR spectra of rGO, Bi 20 TiO 32 and 2% rGO/Bi 20 TiO 32 . Three characteristic absorption peaks of rGO are observed at 1730 cm À1 , 1578 cm À1 , 1061 cm À1 , corresponding to the stretching vibration of carboxyl groups (C¼O), the skeletal vibration of rGO evolves and the stretching vibration of epoxy groups (CÀ ÀO), respectively [33,34]. As for Bi 20 TiO 32 , there are four strong peaks at 489 cm À1 , 564 cm À1 , 799 cm À1 and 1468 cm À1 .…”

Section: Photocatalytic Activity Experimentsmentioning

confidence: 98%

Fabrication of novel rGO/Bi20TiO32 heterojunction for enhanced visible-light photocatalytic activity

Zhang

Xie

et al. 2016

Journal of Photochemistry and Photobiology A: Chemistry

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Ag-loaded TiO2/reduced graphene oxide nanocomposites for enhanced visible-light photocatalytic activity

Cited by 118 publications

References 42 publications

Elucidation of the function of oxygen moieties on graphene oxide and reduced graphene oxide in the nucleation and growth of silver nanoparticles

Elucidation of the function of oxygen moieties on graphene oxide and reduced graphene oxide in the nucleation and growth of silver nanoparticles

Effective Electron Transfer Pathway of the Ternary TiO2/RGO/Ag Nanocomposite with Enhanced Photocatalytic Activity under Visible Light

Fabrication of novel rGO/Bi20TiO32 heterojunction for enhanced visible-light photocatalytic activity

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