Glucosamine-induced growth of highly distributed TiO<sub>2</sub> nanoparticles on graphene nanosheets as high-performance photocatalysts

Gu, Lanbing; Zhang, Haijiao; Jiao, Zheng; Li, Minjie; Wu, Minghong; Lei, Yong

doi:10.1039/c6ra15028d

Cited by 6 publications

(3 citation statements)

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“…Plus, the O 1s spectrum in Fig. 5(C) confirms the presence of oxygen in metal oxide at the peaks of 530.2 and 533.11 eV corresponding to the Ti-O-Ti and Ti-O-C bonds, respectively in a hybrid graphene-Pt/TiO 2 nanostructure 31 , 32 . Deconvolution of Ti 2p in hybrid nanostructure (Fig.…”

Section: Resultsmentioning

confidence: 65%

Surfactant/organic solvent free single-step engineering of hybrid graphene-Pt/TiO2 nanostructure: Efficient photocatalytic system for the treatment of wastewater coming from textile industries

Ghouri

Elsaid

Abdala

et al. 2018

Sci Rep

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In this study, hybrid graphene-Pt/TiO2 nanostructure were synthesized by single-step, inexpensive and surfactant/organic solvent free route; hydrothermal technique. The physicochemical properties of hybrid graphene-Pt/TiO2 nanostructure were carefully analyzed by multiple techniques, including X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscope (FESEM) and transmission electron microscope (TEM). The synthesized hybrid nanostructures were utilized as photocatalyst for the degradation of methylene blue (MB) dye under natural environment at average ambient temperature and mean daily global solar radiation, of about 22–25 °C and 374.9 mWh/cm2, respectively. The activity performance indicated considerable degradation of methylene blue (MB) dye and was in the following order Gr (13%), TiO2 (60%) and hybrid graphene-Pt/TiO2 nanostructure (90%) over 21 min under the natural light illumination. The physiochemical characterization suggests that, the tightly attached metalized TiO2 nanoparticles (Pt-TiO2) on the high surface area graphene sheets improved utilization of visible light and increased separation and transfer of photo-excited electron (ē) hole (h+) pairs. Notably, the hybrid graphene-Pt/TiO2 nanostructure exhibited an excellent cyclic stability for methylene blue (MB) dye removal. Finally, the kinetic behavior indicated that the photocatalytic degradation reaction of the dye obeyed the pseudo-first order (Langmuir-Hinshelwood) kinetics model.

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Section: Resultsmentioning

confidence: 65%

Surfactant/organic solvent free single-step engineering of hybrid graphene-Pt/TiO2 nanostructure: Efficient photocatalytic system for the treatment of wastewater coming from textile industries

Ghouri

Elsaid

Abdala

et al. 2018

Sci Rep

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“…A new nanomaterial composed of ultra-small TiO 2 nanoparticles and reduced graphene oxide (rGO) nanosheets was reported by Gu and coworkers [21] who used glucosamine as the carbon source in alkaline media through a hydrothermal treatment; the 13-nm TiO 2 nanoparticles were strongly anchored on the graphene structure. The TiO 2 /rGO obtained through a thermal treatment at 700 • C exhibited better photoactivity in the photodegradation of methyl orange than those produced at other calcination temperatures; it also displayed good photoactivity toward the degradation of rhodamine-B (RhB) and methylene blue (MB).…”

Section: Introductionmentioning

confidence: 99%

Pyrolytic Formation of TiO2/Carbon Nanocomposite from Kraft Lignin: Characterization and Photoactivities

et al. 2020

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This article reports on the formation of pyrolytic carbon/TiO 2 nanocomposite (p-C/TiO 2 ) by pyrolysis of a mixture of the P25 TiO 2 and kraft lignin at 600 • C. The result was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, UV-visible spectroscopy, electron paramagnetic resonance spectrometry (EPR), thermogravimetry (TGA) and SEM microscopy. Its photocatalytic activity was ascertained using three classes of chemical probes, namely (i) degradation of methylene blue (MB) and rhodamine-B (RhB) dyes in UV light-irradiated aqueous suspensions, (ii) depletion of phenol and (iii) degradation of antibiotics. The p-C/TiO 2 nanocomposite is a strong phisisorbent of both MB and RhB nearly twofold with respect to neat TiO 2 . Although it is nearly twofold more photoactive toward the degradation of MB (0.091 min −1 versus 0.047 min −1 ), it is not with regard to RhB degradation (0.064 min −1 versus 0.060 min −1 ). For the degradation of phenol in aqueous media (pH 3), pristine TiO 2 was far more effective than p-C/TiO 2 for oxygenated suspensions (17.6 × 10 −3 mM min −1 versus 4.3 × 10 −3 mM min −1 ). Under an argon atmosphere, the kinetics were otherwise identical. The activity of the material was tested also for a real application in the degradation of a fluoroquinolone antibiotic such as enrofloxacin (ENR) in tap water. It is evident that the photoactivity of a semiconductor photocatalyst is not a constant, but it does depend on the nature of the substrate used and on the experimental conditions. It is also argued that the use of dyes to assess photocatalytic activities when suspensions are subjected to visible light irradiation is to be discouraged as the dyes act as electron transfer photosensitizers and or can undergo photodegradation from their excited states.

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“…A new nanomaterial composed of ultrasmall TiO 2 nanoparticles and rGO nanosheets was prepared by Gu et al [216], who used glucosamine in alkaline conditions under hydrothermal treatment. In this synthesis, glucosamine regulated the growth and homogeneity of TiO 2 nanoparticles dispersed on the G structure, permitting the formation of the expected GTiO 2 Ns products, demonstrating that TiO 2 nanoparticles about 13 nm in diameter were strongly anchored on G. Different GTiO 2 Ns samples were calcined at several temperatures; in particular, the GTiO 2 Ns sample treated at 700 • C showed good photocatalytic activity in MB photodegradation compared to those produced at other calcination temperatures.…”

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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Glucosamine-induced growth of highly distributed TiO₂ nanoparticles on graphene nanosheets as high-performance photocatalysts

Abstract: Ultrasmall TiO2 nanoparticles@graphene composites with superior photocatalytic activity have been designed by a facile glucosamine-assisted hydrothermal strategy.

Cited by 6 publications

References 50 publications

Surfactant/organic solvent free single-step engineering of hybrid graphene-Pt/TiO2 nanostructure: Efficient photocatalytic system for the treatment of wastewater coming from textile industries

Surfactant/organic solvent free single-step engineering of hybrid graphene-Pt/TiO2 nanostructure: Efficient photocatalytic system for the treatment of wastewater coming from textile industries

Pyrolytic Formation of TiO2/Carbon Nanocomposite from Kraft Lignin: Characterization and Photoactivities

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

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Glucosamine-induced growth of highly distributed TiO2 nanoparticles on graphene nanosheets as high-performance photocatalysts

Abstract: Ultrasmall TiO2 nanoparticles@graphene composites with superior photocatalytic activity have been designed by a facile glucosamine-assisted hydrothermal strategy.

Cited by 6 publications

References 50 publications

Surfactant/organic solvent free single-step engineering of hybrid graphene-Pt/TiO2 nanostructure: Efficient photocatalytic system for the treatment of wastewater coming from textile industries

Surfactant/organic solvent free single-step engineering of hybrid graphene-Pt/TiO2 nanostructure: Efficient photocatalytic system for the treatment of wastewater coming from textile industries

Pyrolytic Formation of TiO2/Carbon Nanocomposite from Kraft Lignin: Characterization and Photoactivities

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

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Glucosamine-induced growth of highly distributed TiO₂ nanoparticles on graphene nanosheets as high-performance photocatalysts