Effects of various TiO2 nanostructures and graphene oxide on photocatalytic activity of TiO2

Gao, Peng; Li, Anran; Sun, Darren Delai; Ng, Wun Jern

doi:10.1016/j.jhazmat.2014.06.061

Cited by 102 publications

(41 citation statements)

References 43 publications

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“…However, the fabrication procedure and apply this TiO 2 nanoparticle in pollutant elimination suffer from several difficulties, such as agglomeration, separation and recovery of fine catalyst particles, which limit to exploit its best photo-efficiency [11]. In recent years, combining TiO 2 nanoparticles with carbon materials (such as carbon nanotube, graphene and graphene oxide) or magnetic materials is an effective method to overcome these disadvantages [12][13][14][15]. Graphene oxide is a chemically modified graphene with oxygen functional groups [16].…”

Section: Introductionmentioning

confidence: 99%

Characterization and improved solar light activity of vanadium doped TiO2/diatomite hybrid catalysts

Wang

Zhang

Leng

et al. 2015

Journal of Hazardous Materials

161

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V-doped TiO2/diatomite composite photocatalysts with different vanadium concentrations were synthesized by a modified sol-gel method. The diatomite was responsible for the well dispersion of TiO2 nanoparticles on the matrix and consequently inhibited the agglomeration. V-TiO2/diatomite hybrids showed red shift in TiO2 absorption edge with enhanced absorption intensity. Most importantly, the dopant energy levels were formed in the TiO2 bandgap due to V(4+) ions substituted to Ti(4+) sites. The 0.5% V-TiO2/diatomite photocatalyst displayed narrower bandgap (2.95 eV) compared to undoped sample (3.13 eV) and other doped samples (3.05 eV) with higher doping concentration. The photocatalytic activities of V doped TiO2/diatomite samples for the degradation of Rhodamine B under stimulated solar light illumination were significantly improved compared with the undoped sample. In our case, V(4+) ions incorporated in TiO2 lattice were responsible for increased visible-light absorption and electron transfer to oxygen molecules adsorbed on the surface of TiO2 to produce superoxide radicals ˙O2(-), while V(5+) species presented on the surface of TiO2 particles in the form of V2O5 contributed to e(-)-h(+) separation. In addition, due to the combination of diatomite as support, this hybrid photocatalyst could be separated from solution quickly by natural settlement and exhibited good reusability.

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Section: Introductionmentioning

confidence: 99%

Characterization and improved solar light activity of vanadium doped TiO2/diatomite hybrid catalysts

Wang

Zhang

Leng

et al. 2015

Journal of Hazardous Materials

161

View full text Add to dashboard Cite

show abstract

“…The specific surface area of the TiO 2 nanotube, TiO 2 nanowire and nanosheet-decorated TiO 2 nanowire will be investigated by BET, which will be discussed in the following section. In addition, these sharp peaks also represent good crystallinity formed by the different TiO 2 nanostructures [39]. As compared to rutile phase, anatase phase has been reported to possess better efficiency for photocatalytic activity [40], this is due to the presence of lower surface area resulted from the close packing structure of the rutile polymorph [41].…”

Section: Resultsmentioning

confidence: 93%

A study on the performance of self-cleaning oil–water separation membrane formed by various TiO2 nanostructures

Tan

Tai

Juay

et al. 2015

Separation and Purification Technology

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“…They suggested a reaction mechanism on the basis of the obtained results. Furthermore, Gao et al [254] synthesized different TiO 2 nanostructures: one-dimensional TiO 2 nanotubes and nanowires, three-dimensional spheres assembled by nanoparticles and by nanosheets. The results of photodegradation activity in the AO7 degradation indicated that the photodegradation efficiency of TiO 2 spheres assembled by nanosheets was the highest with respect to the other TiO 2 nanostructures, while its specific surface area was lower than that of TiO 2 nanotubes.…”

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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Effects of various TiO2 nanostructures and graphene oxide on photocatalytic activity of TiO2

Cited by 102 publications

References 43 publications

Characterization and improved solar light activity of vanadium doped TiO2/diatomite hybrid catalysts

Characterization and improved solar light activity of vanadium doped TiO2/diatomite hybrid catalysts

A study on the performance of self-cleaning oil–water separation membrane formed by various TiO2 nanostructures

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

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