Hydrothermal synthesis of 3D urchin-like Ag/TiO2/reduced graphene oxide composites and its enhanced photocatalytic performance

Liu, Yuhuan; Zhou, Yongkang; Yang, Luyue; Wang, Yutang; Wu, Yiwei; Li, Chaocheng; Lü, Jun

doi:10.1007/s11051-016-3596-6

Cited by 11 publications

(9 citation statements)

References 36 publications

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“…As displayed in Fig. 1 54 In the case of RGO-Ag-TiO 2 , the characteristic diffraction peak of GO disappears, indicating that the exfoliated GO sheet was reduced during the hydrothermal reaction and the intercalated Ag-TiO 2 particles were stacked into GO layers. Furthermore, partial rather than all characteristic diffraction peaks of Ag (200) (311) and TiO 2 (105) (211) (204) are observed for RGO-Ag-TiO 2 .…”

Section: Resultsmentioning

confidence: 94%

“…In addition, the intensity of these characteristic stretching vibrations peak weakens noticeably and even disappears entirely in RGO‐Ag‐TiO 2 , which indicates that GO was effectively reduced to RGO after the hydrothermal reaction. Meanwhile part of the oxygen‐containing groups were combined with TiO 2 and became Ti–O–C band . Compared with GO, some new characteristic absorption bands below 1000 cm ‐1 are found in the other three curves; this could be ascribed to the Ti–O–Ti stretching vibrations of TiO 2 , Ag‐TiO 2 and RGO‐Ag‐TiO 2 samples …”

Section: Resultsmentioning

confidence: 97%

“…In the case of TiO 2 , the peaks at 2θ = 22.3°, 34.0°, 44.7°, 50.5°, 59.7° and 67.3° are assigned as the typical diffraction peaks from (101), (004), (105), (211), (204) and (220) of anatase TiO 2 (JCPDS‐1272), respectively. And all Ag‐TiO 2 hybrids exhibit reflections at 2θ angles of 34.7°, 40.1°, 62.3°, 67.2° and 71.6° characteristic of the (111), (200), (220), (311), and (222) crystalline planes of the face‐centered cubic structure of Ag (JCPDS‐65‐2871) . In the case of RGO‐Ag‐TiO 2 , the characteristic diffraction peak of GO disappears, indicating that the exfoliated GO sheet was reduced during the hydrothermal reaction and the intercalated Ag‐TiO 2 particles were stacked into GO layers.…”

Section: Resultsmentioning

confidence: 99%

“…Meanwhile part of the oxygen-containing groups were combined with TiO 2 and became Ti-O-C band. 54 together on TiO 2 surface. The result of ICP-OES indicates that the real loading of Ag in Ag-TiO 2 is about 9.79 wt%.…”

Section: Ftir Spectroscopymentioning

confidence: 99%

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A novel photocatalytic membrane decorated with RGO‐Ag‐TiO₂ for dye degradation and oil–water emulsion separation

Chen

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND Membrane separation is a promising process for treatment of dye and oily wastewater if the antifouling capacity and recyclability can be improved. In recent years, the development of photocatalytic materials has provided new methods for research into membrane technology. RESULTS In this study, a novel photocatalytic membrane decorated with RGO‐Ag‐TiO2 nanomaterial was fabricated by simple vacuum filtration for degradation of dye and separation of oil–water. First, TiO2 nanowires were prepared for more effective photocatalysis, reduced graphene oxide (RGO)‐Ag‐TiO2 was fabricated by a facile hydrothermal reaction, then it was directly decorated on cellulose acetate (CA) membrane using polyethylene glycol and glutaraldehyde. CONCLUSION The as‐prepared photocatalytic membrane can simultaneously degrade dye and separate oil–water emulsions under visible‐light irradiation in a short time. The membrane has extremely high water flux (191 L m‐2 h‐1) and rejection rates (almost 100%) of dye–oil–water emulsion. More importantly, the photocatalytic membrane shows excellent antifouling capacity and recyclability, and retains relatively stable dye–oil–water permeation flux (about 27.5 L m‐2 h‐1) and high rejection rates (up to 99%) after six cycles of experiments under visible‐light irradiation. Overall, the photocatalytic membrane opens up new avenues for the treatment of wastewater. © 2017 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Ftir Spectroscopymentioning

confidence: 99%

See 2 more Smart Citations

A novel photocatalytic membrane decorated with RGO‐Ag‐TiO₂ for dye degradation and oil–water emulsion separation

Chen

et al. 2017

J of Chemical Tech & Biotech

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“…The intensity ratio of D to G band (I D /I G ) can be used to evaluate rGO graphitization degree because it can be increased by the chemical reduction of GO [36]. The result shows that the I D /I G ratio increases from 0.94 of GO to 1.18 of rGO, indicating the successful reduction of GO under UV irradiation [25,37]. The as-prepared GO dispersion was dividedly put into the electrolyte of the first and second step anodic oxidation to prepare TiO 2 R-rGO/T and TiO 2 R/T-rGO, causing a few differences in I-t and U-t of the preparation process.…”

Section: The Effect Of Rgo On the Compositions And Morphologies Of Agmentioning

confidence: 99%

Electrochemical Fabrication of rGO-embedded Ag-TiO2 Nanoring/Nanotube Arrays for Plasmonic Solar Water Splitting

2019

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HIGHLIGHTS• Reduced graphene oxide (rGO) in electrode can weaken the light scattering of plasmonic Ag nanoparticles and promote the hot electrons transfer from Ag nanoparticles to Ti substrate.• A route synergizing rGO with plasmonic Ag on TiO 2 for plasmonic solar water splitting was provided.ABSTRACT Effective utilization of hot electrons generated from the decay of surface plasmon resonance in metal nanoparticles is conductive to improve solar water splitting efficiency. Herein, Ag nanoparticles and reduced graphene oxide (rGO) co-decorated hierarchical TiO 2 nanoring/nanotube arrays (TiO 2 R/T) were facilely fabricated by using two-step electrochemical anodization, electrodeposition, and photoreduction methods. Comparative studies were conducted to elucidate the effects of rGO and Ag on the morphology, photoresponse, charge transfer, and photoelectric properties of TiO 2 . Firstly, scanning electron microscope images confirm that the Ag nanoparticles adhered on TiO 2 R/T and TiO 2 R/T-rGO have similar diameter of 20 nm except for TiO 2 R-rGO/T. Then, the UV-Vis DRS and scatter spectra reveal that the optical property of the Ag-TiO 2 R/T-rGO ternary composite is enhanced, ascribing to the visible light absorption of plasmonic Ag nanoparticles and the weakening effect of rGO on light scattering. Meanwhile, intensity-modulated photocurrent spectroscopy and photoluminescence spectra demonstrate that rGO can promote the hot electrons transfer from Ag nanoparticles to Ti substrate, reducing the photogenerated electronhole recombination. Finally, Ag-TiO 2 R/T-rGO photoanode exhibits high photocurrent density (0.98 mA cm −2 ) and photovoltage (0.90 V), and the stable H 2 evolution rate of 413 μL h −1 cm −2 within 1.5 h under AM 1.5 which exceeds by 1.30 times than that of pristine TiO 2 R/T. In line with the above results, this work provides a reliable route synergizing rGO with plasmonic metal nanoparticles for photocatalysis, in which, rGO presents a broad absorption spectrum and effective photogenerated electrons transfer. TiO 2 nanoring/nanotube arrays rGO flakes Ti substrate e − e − e − h + e − Ag/AgCl electrode Pt electrode H 2 production TiO 2 /Ag/Ag 2 O Electrochemical workstation −7.4 eV −4.2 eV −4.26 eV −4.47 eV −4 −5 −6 −7 −8 −5.98 eV Vacuum E (eV)

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Sol-gel synthesized hexagonal boron nitride/titania nanocomposites with enhanced photocatalytic activity

Sheng

Yang

Wang

et al. 2019

Applied Surface Science

178

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Hydrothermal synthesis of 3D urchin-like Ag/TiO2/reduced graphene oxide composites and its enhanced photocatalytic performance

Cited by 11 publications

References 36 publications

A novel photocatalytic membrane decorated with RGO‐Ag‐TiO₂ for dye degradation and oil–water emulsion separation

A novel photocatalytic membrane decorated with RGO‐Ag‐TiO₂ for dye degradation and oil–water emulsion separation

Electrochemical Fabrication of rGO-embedded Ag-TiO2 Nanoring/Nanotube Arrays for Plasmonic Solar Water Splitting

Sol-gel synthesized hexagonal boron nitride/titania nanocomposites with enhanced photocatalytic activity

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Hydrothermal synthesis of 3D urchin-like Ag/TiO2/reduced graphene oxide composites and its enhanced photocatalytic performance

Cited by 11 publications

References 36 publications

A novel photocatalytic membrane decorated with RGO‐Ag‐TiO2 for dye degradation and oil–water emulsion separation

A novel photocatalytic membrane decorated with RGO‐Ag‐TiO2 for dye degradation and oil–water emulsion separation

Electrochemical Fabrication of rGO-embedded Ag-TiO2 Nanoring/Nanotube Arrays for Plasmonic Solar Water Splitting

Sol-gel synthesized hexagonal boron nitride/titania nanocomposites with enhanced photocatalytic activity

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A novel photocatalytic membrane decorated with RGO‐Ag‐TiO₂ for dye degradation and oil–water emulsion separation

A novel photocatalytic membrane decorated with RGO‐Ag‐TiO₂ for dye degradation and oil–water emulsion separation