TiO2 wrapped graphene as a high performance photocatalyst for acid orange 7 dye degradation under solar/UV light irradiations

Muthirulan, P.; Devi, C. Nirmala; Sundaram, M. Meenakshi

doi:10.1016/j.ceramint.2013.11.042

Cited by 83 publications

(36 citation statements)

References 55 publications

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“…The peak at 2927 cm -1 was assigned to stretching vibrations of C-H bonds, and the peaks at 1000-1300 cm -1 were attributed to the C-OH stretching and O-H bending vibrations [26]. The intensity of the absorption band in the region of 800-400 cm -1 can be assigned to Ti-O stretching and Ti-O-Ti bridging stretching modes [27,28]. Compared with the spectrum of Fig.…”

Section: Resultsmentioning

confidence: 96%

Controlled preparation of TiO2 hollow microspheres constructed by crosslinked nanochains with high photocatalytic activity

Song

You

Chen

et al. 2015

J Mater Sci: Mater Electron

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TiO 2 hollow microspheres were successfully synthesized via a controlled hydrolysis reaction, which involved the deposition of an inorganic coating of TiO 2 on the surface of carbon spheres and subsequent removal of carbon spheres by calcination in air. The as-prepared TiO 2 hollow microspheres with an average diameter of 200 nm presented a novel morphology, which was constructed by closely crosslinked TiO 2 nanochains. The morphology of the hollow sphere can be controlled by varying the concentration of TiCl 3 solution. A possible formation mechanism was also proposed. The photo-degradation of rhodamine B (RhB) aqueous solution showed that TiO 2 hollow microspheres exhibited higher photocatalytic activity than that of TiO 2 nanoparticles. The enhanced photocatalytic activity of the as-prepared TiO 2 microspheres here could result from their hollow structures assembled by TiO 2 nanochains and large light-harvesting efficiency.

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Section: Resultsmentioning

confidence: 96%

Controlled preparation of TiO2 hollow microspheres constructed by crosslinked nanochains with high photocatalytic activity

Song

You

Chen

et al. 2015

J Mater Sci: Mater Electron

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“…From recent investigations, graphene-TiO 2 composites were successfully fabricated and applied for photocatalysis. Muthirulan et al [17,18] demonstrated the fabrication of titanium dioxide (TiO 2 )-graphene (GR) (TiO 2 -GR) nanocomposites for acid orange 7 (AO7) degradation under UV irradiation. Liang et al [19] communicated that a hybrid material of graphene-TiO 2 for Rh-B degradation.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of graphene–TiO2 nanocomposite with improved photocatalytic degradation for acid orange 7 dye under solar light irradiation

2016

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In this study, photodegradation of the non-biodegradable azo dye acid orange 7 (AO7) was selected as modal target in aqueous solution using graphene-TiO 2 (GR-TiO 2 ) hybrid nanocomposite, was well investigated and elucidated. The crystal phase, special surface area, microscopic analysis of the GR-TiO 2 and also, chemical state of the photocatalysts were studied by powdered X-ray diffraction (PXRD), Raman spectrum, field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high resolution scanning electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), Brunauere Emmette Teller (BET) method and photoluminescence spectroscopy (PL). During photocatalysis, the GR-TiO 2 nanocomposite improved photocatalytic performance compared with that of pure TiO 2 towards AO7 organic azo-dye degradation. The reusability test of photocatalytic activity was also examined. A conceivable reaction mechanism was suggested and nattered on the basis of tentative effects. Therefore, the GR-TiO 2 nanomaterial can be widely used as a photocatalyst for treating the organic dye contaminant in the field of environmental protection.

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“…The results were attributed to the highest light harvesting capacity under solar light derived from the multiple reflections of light, and from the hierarchical mesoporous structure. The last example regards the study of Muthirulan et al [255], who fabricated GTiO 2 Ns by using a simple one-step chemical process, mixing TiO 2 nanoparticles suspended in ethanol with G followed by ultrasonication and successive treatment in a rotary evaporator under vacuum. The dried GTiO 2 Ns showed improvement in the photocatalytic ability in the degradation of AO7 under both UV and solar light irradiations.…”

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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TiO2 wrapped graphene as a high performance photocatalyst for acid orange 7 dye degradation under solar/UV light irradiations

Cited by 83 publications

References 55 publications

Controlled preparation of TiO2 hollow microspheres constructed by crosslinked nanochains with high photocatalytic activity

Controlled preparation of TiO2 hollow microspheres constructed by crosslinked nanochains with high photocatalytic activity

Fabrication of graphene–TiO2 nanocomposite with improved photocatalytic degradation for acid orange 7 dye under solar light irradiation

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

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