Photocatalytic degradation of ethylene using titanium dioxide nanotube arrays with Ag and reduced graphene oxide irradiated by γ-ray radiolysis

Zhang, Quan; Ye, Shengying; Chen, Xuemei; Song, Xinshan; Li, Liqin; Huang, Xun

doi:10.1016/j.apcatb.2016.10.034

Cited by 37 publications

(12 citation statements)

References 43 publications

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“…The brighter particles correspond to FeO nanoparticles rather than TiO 2 due to the higher electronegativity nature of Fe ions. The TiO 2 structure presents less amount of oxygen, 37 and higher polarity, 38 leading to lower electronegativity. Additionally, the absence of fissures and the presence of a more compact surface can be attributed to the nanoparticles, which act as cross-linking agents, leading to the formation of a stable structure with an average diameter size of 1311 μm (see Figure S1 ).…”

Section: Resultsmentioning

confidence: 99%

Ionic Cross-Linking Fabrication of Chitosan-Based Beads Modified with FeO and TiO₂ Nanoparticles: Adsorption Mechanism toward Naphthalene Removal in Seawater from Cartagena Bay Area

et al. 2020

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Polycyclic aromatic hydrocarbons (PAHs) are complex molecules produced by the thermal decomposition of organic matter in anthropogenic activities. Novel composites with enhanced physicochemical properties aim to overcome limitations such as adsorption capacity, affinity, and stability for PAHs adsorption. Composites based on chitosan are promising due to the good biocompatibility and adsorption properties. This study focuses on the facile preparation of chitosan beads modified with iron oxide (FeO) and titanium dioxide (TiO 2 ) nanoparticles via ionic cross-linking (Ch-FeO/TiO 2 ). FeO and TiO 2 were synthesized performing co-precipitation and green chemistry methods, respectively. The characterization evidenced the formation of Ch-FeO/TiO 2 with good crystallinity, excellent thermal stability, and superparamagnetic response, attributed to the presence of FeO and TiO 2 nanoparticles. High thermal stability up to 270 °C was related to the cross-linked chitosan network. The enhanced adsorption mechanism of Ch-FeO/TiO 2 was determined by removing naphthalene from water and seawater samples. The Ch-FeO/TiO 2 showed a higher adsorption capacity of 33.1 mg/g compared to 29.8 mg/g of the unmodified chitosan (un-Ch) beads. This is due to the higher functional surface area of 27.13 m 2 /g, compared to that of 0.708 m 2 /g for un-Ch. We found a rapid adsorption rate of 240 min and the maximum adsorption capacity of 149.3 mg/g for Ch-FeO/TiO 2 . A large number of actives sites allows for increasing the naphthalene molecules interaction. Adsorption in seawater samples from Cartagena Bay (Colombia) exhibits an outstanding efficiency of up to 90%. These results suggest a promising, cheap, and environmentally friendly composite for remediation of water sources contaminated with complex compounds.

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Section: Resultsmentioning

confidence: 99%

Ionic Cross-Linking Fabrication of Chitosan-Based Beads Modified with FeO and TiO₂ Nanoparticles: Adsorption Mechanism toward Naphthalene Removal in Seawater from Cartagena Bay Area

et al. 2020

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“…31 Ag NPs on rGO and titania nanotube arrays were also prepared as photocatalysts. 32 These trials however fail to deliver surfactant-free NP surface, ultrafine NP size, narrow size distribution, and/or uniform NP dispersity, which unfortunately are paramount attributes for heterogeneous catalysts. Given the three components of the irradiated system (metal precursor, solvent and support), the improvement of radiolytic synthesis thus calls for appropriate selection of the solvent and support materials.…”

Section: Introductionmentioning

confidence: 99%

Photon-induced synthesis of ultrafine metal nanoparticles on graphene as electrocatalysts: impact of functionalization and doping

et al. 2020

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“…2 c, exhibiting the characteristic D and G bands of the carbon materials. 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 ].…”

Section: Resultsmentioning

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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Photocatalytic degradation of ethylene using titanium dioxide nanotube arrays with Ag and reduced graphene oxide irradiated by γ-ray radiolysis

Cited by 37 publications

References 43 publications

Ionic Cross-Linking Fabrication of Chitosan-Based Beads Modified with FeO and TiO₂ Nanoparticles: Adsorption Mechanism toward Naphthalene Removal in Seawater from Cartagena Bay Area

Ionic Cross-Linking Fabrication of Chitosan-Based Beads Modified with FeO and TiO₂ Nanoparticles: Adsorption Mechanism toward Naphthalene Removal in Seawater from Cartagena Bay Area

Photon-induced synthesis of ultrafine metal nanoparticles on graphene as electrocatalysts: impact of functionalization and doping

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

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Photocatalytic degradation of ethylene using titanium dioxide nanotube arrays with Ag and reduced graphene oxide irradiated by γ-ray radiolysis

Cited by 37 publications

References 43 publications

Ionic Cross-Linking Fabrication of Chitosan-Based Beads Modified with FeO and TiO2 Nanoparticles: Adsorption Mechanism toward Naphthalene Removal in Seawater from Cartagena Bay Area

Ionic Cross-Linking Fabrication of Chitosan-Based Beads Modified with FeO and TiO2 Nanoparticles: Adsorption Mechanism toward Naphthalene Removal in Seawater from Cartagena Bay Area

Photon-induced synthesis of ultrafine metal nanoparticles on graphene as electrocatalysts: impact of functionalization and doping

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

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Ionic Cross-Linking Fabrication of Chitosan-Based Beads Modified with FeO and TiO₂ Nanoparticles: Adsorption Mechanism toward Naphthalene Removal in Seawater from Cartagena Bay Area

Ionic Cross-Linking Fabrication of Chitosan-Based Beads Modified with FeO and TiO₂ Nanoparticles: Adsorption Mechanism toward Naphthalene Removal in Seawater from Cartagena Bay Area