Preparation of fiber-based plasmonic photocatalyst and its photocatalytic performance under the visible light

Lin, Cheng Huang; Yang, Sudong; Hao, Bin; Ruan, Jiongming; Ma, Peng‐Cheng

doi:10.1016/j.apcatb.2014.11.044

Cited by 34 publications

(9 citation statements)

References 46 publications

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“…It reveals that the TG precursors are amorphous with no characteristic diffraction peaks (figure 2A). After reflux heating, the main peaks at 2θ values of 25.3, 37.9, 48.1, 54.0, 55.2 and 62.8 • in curve B can be indexed to the (101), (004), (200), (105), (211) and (204) crystal planes of anatase, which match well with JCPDS 21-1272 [17]. Moreover, figure 2C shows that TiO 2 particles exist in the PANI shell and also indicates that the crystal structure of TiO 2 can be well maintained during the PANI polymerization process under acidic conditions.…”

Section: Resultssupporting

confidence: 72%

Interface engineering of $$\hbox {TiO}_{2}$$ TiO 2 @PANI nanostructures for efficient visible-light activation

Chen

Yang

2018

Bull Mater Sci

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Core-shell-structured TiO 2 @PANI composites were fabricated using negatively charged titanium glycolate (TG) precursor spheres, which were decorated using hydrochloric acid; subsequently, the uniform polyaniline (PANI) layer could be attached onto the surface of the polystyrene spheres by in situ chemical oxidative polymerization and finally, the resulting PANI-grafted TG were allowed to hydrolyse by treating the material with hot water. The TGs were transformed to porous TiO 2 , leading to the formation of core-shell TiO 2 @PANI composites. The resulting TiO 2 @PANI composite photocatalysts were characterized by X-ray diffraction, scanning electron microscopy, ultraviolet-visible diffuse reflection spectroscopy and photoluminescence spectroscopy. Significantly, the TiO 2 @PANI composite photocatalysts exhibited dramatically enhanced photo-induced electron-hole separation efficiency, which was confirmed by the results of photocurrent measurements. PANI was dispersed uniformly over the porous TiO 2 surface with an intimate electronic contact on the interface to act cooperatively to achieve enhanced photocatalytic properties, indicating that core-shell TiO 2 @PANI composite photocatalysts could be promising candidate catalysts under visible-light irradiation. The mechanism of enhancing photocatalytic activity was proposed on the basis of the experimental results and estimated energy band positions.

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Section: Resultssupporting

confidence: 72%

Interface engineering of $$\hbox {TiO}_{2}$$ TiO 2 @PANI nanostructures for efficient visible-light activation

Chen

Yang

2018

Bull Mater Sci

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“…Cheng et al 31 studied the degradation of RhB with Ag@TiO 2 core−shell nanostructure and obtained almost full decomposition but with the UV light irradiation. Additionally, Chen et al, 32 Wang et al, 33 and Cui et al 34 have studied the photocatalytic dye degradation by Ag, Ag 2 O, and AgBr incorporated TiO 2 nanostructures assuming pseudo first order rate kinetics with single rate constant. However, the presented data does not fit well with the first order rate kinetics.…”

Section: Introductionmentioning

confidence: 99%

Role of Surface Plasmons and Hot Electrons on the Multi-Step Photocatalytic Decay by Defect Enriched Ag@TiO₂ Nanorods under Visible Light

Paul

Giri

2017

J. Phys. Chem. C

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Heterogeneous photocatalysis is of overriding significance for emerging energy and environment applications. Nanosized metal–semiconductor heterostructures (HSs) allow extraordinarily tuned and intense absorption of light, making it very promising for efficient solar energy harvesting in photovoltaic and photocatalytic applications. Here we report on the ultrahigh rate of photodegradation of organic dye, Rhodamine-B, with two distinct sequential degradation rate processes under visible light illumination on Ag nanoparticle (NP) decorated anatase TiO2 nanorods (NRs) grown by a solvothermal route. HRTEM analysis reveals the uniform decoration of Ag NPs (∼17 nm) over the TiO2 NRs surface for the optimized Ag@TiO2 HS. The defect rich Ag@TiO2 NR HSs grown with an optimal weight ratio Ag:TiO2 = 3:2 (TA32) exhibit very strong optical absorption due to the localized surface plasmon resonance (LSPR) effect over the entire visible region, having an absorption peak at ∼520 nm. The effective band gap of TA32 has been significantly reduced to 2.71 eV from the pure TiO2 band gap of 3.2 eV. Studies on photocatalysis of Rhodamine-B show a very high degradation rate for the HSs due to the LSPR effect in the noble Ag NPs and fast charge transfer at the Ag@TiO2 interface. The optimized heterostructure (TA32) exhibits nearly double plasmonic absorbance than the other HSs, and it shows the highest degradation rate under visible light irradiation. In contrast to the available models, in the present case the degradation kinetics follows a sequential rate process with two distinct exponential decay functions/rate constants. For the optimized HS (TA32), the degradation rate constants are found to be 0.083 (k 2) and 0.033 min–1 (k 1) in the second and first stages of degradation, respectively. The pseudo first order rate constant was >4 times higher in the first stage and ∼10 times stronger in the second stage of degradation for TA32 HS in comparison to the bare TiO2 NRs as well as commercial P25. Our results demonstrate the long-term stability and superiority of the Ag@TiO2 HS over the bare TiO2 NRs and other TiO2 based photocatalysts for detoxification of air/water. This study offers new insights in understanding the mechanism of advanced photocatalysis with multi rate constants by oxygen vacancy enriched Ag@TiO2 nanoheterostructures.

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“…Various hybrid nanocrystals such as TiO 2 -Ag [83] and TiO 2 -Au have been prepared by a photo-reduction method [84]. For instance, this approach has been applied to grow Ag or Au nanoparticles onto TiO 2 NRs [85,86] or on TiO 2 supported on glass fibres [87], thus generating heterostructures. Photodeposition of Au on sulphated TiO 2 (S-TiO 2 ) has been realised by illuminating gold salt under an inert atmosphere (N 2 ) with a lamp having a sun-like radiation spectrum and a main emission line in the UVA range at 365 nm, in a suspension of S-TiO 2 in distilled water containing isopropanol, which acts as a sacrificial donor [88].…”

Section: Photochemical Reduction Of Metals At the Tio 2 Surfacementioning

confidence: 99%

Visible-Light-Active TiO2-Based Hybrid Nanocatalysts for Environmental Applications

et al. 2017

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Photocatalytic nanomaterials such as TiO 2 are receiving a great deal of attention owing to their potential applications in environmental remediation. Nonetheless, the low efficiency of this class of materials in the visible range has, so far, hampered their large-scale application. The increasing demand for highly efficient, visible-light-active photocatalysts can be addressed by hybrid nanostructured materials in which two or more units, each characterised by peculiar physical properties, surface chemistry and morphology, are combined together into a single nano-object with unprecedented chemical-physical properties. The present review intends to focus on hybrid nanomaterials, based on TiO 2 nanoparticles able to perform visible-light-driven photocatalytic processes for environmental applications. We give a brief overview of the synthetic approaches recently proposed in the literature to synthesise hybrid nanocrystals and discuss the potential applications of such nanostructures in water remediation, abatement of atmospheric pollutants (including NO x and volatile organic compounds (VOCs)) and their use in self-cleaning surfaces.

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Preparation of fiber-based plasmonic photocatalyst and its photocatalytic performance under the visible light

Cited by 34 publications

References 46 publications

Interface engineering of $$\hbox {TiO}_{2}$$ TiO 2 @PANI nanostructures for efficient visible-light activation

Interface engineering of $$\hbox {TiO}_{2}$$ TiO 2 @PANI nanostructures for efficient visible-light activation

Role of Surface Plasmons and Hot Electrons on the Multi-Step Photocatalytic Decay by Defect Enriched Ag@TiO₂ Nanorods under Visible Light

Visible-Light-Active TiO2-Based Hybrid Nanocatalysts for Environmental Applications

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Preparation of fiber-based plasmonic photocatalyst and its photocatalytic performance under the visible light

Cited by 34 publications

References 46 publications

Interface engineering of $$\hbox {TiO}_{2}$$ TiO 2 @PANI nanostructures for efficient visible-light activation

Interface engineering of $$\hbox {TiO}_{2}$$ TiO 2 @PANI nanostructures for efficient visible-light activation

Role of Surface Plasmons and Hot Electrons on the Multi-Step Photocatalytic Decay by Defect Enriched Ag@TiO2 Nanorods under Visible Light

Visible-Light-Active TiO2-Based Hybrid Nanocatalysts for Environmental Applications

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Role of Surface Plasmons and Hot Electrons on the Multi-Step Photocatalytic Decay by Defect Enriched Ag@TiO₂ Nanorods under Visible Light