Ultrasonic assisted synthesis of TiO2–reduced graphene oxide nanocomposites with superior photovoltaic and photocatalytic activities

He, Rong; He, Wei

doi:10.1016/j.ceramint.2015.12.114

Cited by 30 publications

(12 citation statements)

References 29 publications

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“…27,35 Some additional contributions of graphene derivatives in their composite-based photocatalyst systems can also be identified as (i) increasing the charge separation and decreasing the recombination rate of e − /h + pairs due to their electron acceptor behavior, and (ii) increasing the visible region light absorption. 6,27,28,33 Dye sensitization is one of the other well-known cost-efficient alternative method for enhancing the photocatalytic activity of TiO 2 . 12,36 Usually, perylene derivatives are the most preferred dyes due to their characteristic properties such as strong light absorption ability in visible region, high light absorption coefficients, high chemical, thermal and photo-stabilities, and insolubility in aqueous media.…”

Section: Introductionmentioning

confidence: 99%

“…12,[19][20][21][22][23] Recently, graphene-based TiO 2 composites attract great attention for the photocatalytic applications because of the remarkable properties of the graphene. 6,[24][25][26][27][28][29][30][31][32][33] Intimate interaction between the TiO 2 nanoparticles and the surface functional groups on the graphene derivatives (GO, rGO, etc.) minimizes the aggregation problem of TiO 2 nanoparticles, increases their surface area and thereby improves their adsorption capacity.…”

Section: Introductionmentioning

confidence: 99%

“…Benefiting from the similar size of nitrogen and oxygen, its metal stable AX center, and small ionization energy, generation of nitrogen‐induced mid‐gap energy level between the conduction and the valance band of TiO 2 occurs and results in improved photocatalytic activity 12,19–23 . Recently, graphene‐based TiO 2 composites attract great attention for the photocatalytic applications because of the remarkable properties of the graphene 6,24–33 . Intimate interaction between the TiO 2 nanoparticles and the surface functional groups on the graphene derivatives (GO, rGO, etc.)…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic activity of dye‐sensitized and non‐sensitized GO‐TiO₂ nanocomposites under simulated and direct sunlight

Ilhan

Cayci

Aksoy

et al. 2021

Int J Applied Ceramic Tech

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Graphene oxide (GO), amine‐modified graphene oxide (mGO), and N‐TiO2 composites were synthesized by low‐temperature hydrothermal method and characterized by using X‐ray diffraction, X‐ray photoelectron spectroscopy, FTIR, and BET analysis techniques. The films of synthesized TiO2, mGO:TiO2, N‐TiO2, GO:TiO2, GO:N‐TiO2, and commercially available P25 were prepared by doctor blade method. These films and their perylene‐3,4,9,10‐tetracarboxy tetrabutylester (PTE)‐sensitized forms were employed as photocatalysts for the photodegradation of rhodamine‐B (RhB) under Xe lamp and direct sunlight irradiations. Independent from the irradiation source, the photocatalytic order of the non‐sensitized films were GO:N‐TiO2 > GO:TiO2 > N‐TiO2 > mGO:TiO2 > TiO2 > P25, but seven and 15 folds of increments were detected under direct sunlight irradiation. PTE‐sensitized catalyst films exhibited more than two folds of increase in the photocatalytic rate constants compared to their non‐sensitized counterparts under Xe lamp irradiation. Under direct sunlight irradiation no matter which photocatalyst was used, the photocatalytic activity of these films was enhanced seven folds. Reusability tests revealed no significant changes in the photocatalytic rate constants obtained with both the non‐sensitized and sensitized films.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photocatalytic activity of dye‐sensitized and non‐sensitized GO‐TiO₂ nanocomposites under simulated and direct sunlight

Ilhan

Cayci

Aksoy

et al. 2021

Int J Applied Ceramic Tech

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“…An ultrasonication-assisted reduction process was used from He et al [245] to produce rGO-TiO 2 nanocomposites. In this process, simultaneous GO reduction and TiO 2 crystals formation were obtained; photocatalytic studies demonstrated that the quantities rGO in these nanocomposites influenced the RhB degradation efficiency under visible light irradiation.…”

Section: Photocatalytic Degradation Of Dyes With Gtio 2 Nsmentioning

confidence: 99%

Recent Advances in Graphene Based TiO2 Nanocomposites (GTiO2Ns) for Photocatalytic Degradation of Synthetic Dyes

et al. 2017

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Synthetic dyes are widely used in textile, paper, food, cosmetic, and pharmaceutical industries. During industrial processes, some of these dyes are released into the wastewater and their successive release into rivers and lakes produces serious environmental problems. TiO 2 is one of the most widely studied and used photocatalysts for environmental remediation. However, it is mainly active under UV-light irradiation due to its band gap of 3.2 eV, while it shows low efficiency under the visible light spectrum. Regarding the exploration of TiO 2 activation in the visible light region of the total solar spectrum, the incorporation of carbon nanomaterials, such as graphene, in order to form carbon-TiO 2 composites is a promising area. Graphene, in fact, has a large surface area which makes it a good adsorbent for organic pollutants removal through the combination of electrostatic attraction and π-π interaction. Furthermore, it has a high electron mobility and therefore it reduces the electron-hole pair recombination, improving the photocatalytic activity of the semiconductor. In recent years, there was an increasing interest in the preparation of graphene-based TiO 2 photocatalysts. The present short review describes the recent advances in TiO 2 photocatalyst coupling with graphene materials with the aim of extending the light absorption of TiO 2 from UV wavelengths into the visible region, focusing on recent progress in the design and applications in the photocatalytic degradation of synthetic dyes.

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“…In addition, the catalytic efficiency of the TiO2 photo catalyst is still quite low, requiring further improvement. Results herein show that doping of TiO2 with non-metal N can narrow the band-gap of TiO2 and effectively expand the spectral response range of TiO2, which improves its absorption capacity of visible light [3][4][5][6]. Ultrasound reactions are generally carried out at ambient temperature and pressure, and are currently under focus for the preparation of optical, magnetic, and catalytic nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Preparation of Nitrogen-doped TiO₂ Nan crystalline Photo catalysts and Evaluation of Photo catalytic Activity

Zhang

Lu²,

Tang³

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Pure TiO 2 and N-doped nano-TiO 2 photo catalysts were individually prepared following the sol-gel method under ultrasonic conditions. The photo catalytic decomposition of methyl orange (MO) solution under ultraviolet and visible light irradiation was used as a probe reaction to estimate their photo catalytic activities. The particle size, crystal structure, and optical properties of the prepared TiO 2 were performed by X-ray diffraction, transmission electron microscopy and UV-vis diffuse reflectance spectroscopy. The results suggest that ultrasound significantly reduced the size of the TiO 2 particles, improved particle dispersion, which in turn improve the photo catalytic activity of TiO 2 under ultraviolet light. Ultrasound also promoted the doping of non-metal nitrogen and markedly enhanced the visible light absorption capacity of the N-doped nano-TiO 2 . Compared with pure TiO 2 , the degradation rate for MO under visible light of U-N-TiO 2 was increased by 70%.

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Ultrasonic assisted synthesis of TiO2–reduced graphene oxide nanocomposites with superior photovoltaic and photocatalytic activities

Cited by 30 publications

References 29 publications

Photocatalytic activity of dye‐sensitized and non‐sensitized GO‐TiO₂ nanocomposites under simulated and direct sunlight

Photocatalytic activity of dye‐sensitized and non‐sensitized GO‐TiO₂ nanocomposites under simulated and direct sunlight

Recent Advances in Graphene Based TiO2 Nanocomposites (GTiO2Ns) for Photocatalytic Degradation of Synthetic Dyes

Ultrasonic Preparation of Nitrogen-doped TiO₂ Nan crystalline Photo catalysts and Evaluation of Photo catalytic Activity

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Ultrasonic assisted synthesis of TiO2–reduced graphene oxide nanocomposites with superior photovoltaic and photocatalytic activities

Cited by 30 publications

References 29 publications

Photocatalytic activity of dye‐sensitized and non‐sensitized GO‐TiO2 nanocomposites under simulated and direct sunlight

Photocatalytic activity of dye‐sensitized and non‐sensitized GO‐TiO2 nanocomposites under simulated and direct sunlight

Recent Advances in Graphene Based TiO2 Nanocomposites (GTiO2Ns) for Photocatalytic Degradation of Synthetic Dyes

Ultrasonic Preparation of Nitrogen-doped TiO2 Nan crystalline Photo catalysts and Evaluation of Photo catalytic Activity

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Photocatalytic activity of dye‐sensitized and non‐sensitized GO‐TiO₂ nanocomposites under simulated and direct sunlight

Photocatalytic activity of dye‐sensitized and non‐sensitized GO‐TiO₂ nanocomposites under simulated and direct sunlight

Ultrasonic Preparation of Nitrogen-doped TiO₂ Nan crystalline Photo catalysts and Evaluation of Photo catalytic Activity