Effective photocatalytic degradation of anthropogenic dyes using graphene oxide grafting titanium dioxide nanoparticles under UV-light irradiation

Atchudan, Raji; Edison, Thomas Nesakumar Jebakumar Immanuel; Perumal, Suguna; Karthikeyan, D.; Lee, Yong Rok

doi:10.1016/j.jphotochem.2016.10.021

Cited by 136 publications

(52 citation statements)

References 51 publications

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“…The peaks at 1391 and 1090 cm −1 could be attributed to the asymmetric and symmetric stretching of C–O–C from ether or epoxy groups. The characteristic band at 1647 cm −1 originated at the C═O group of the N‐CDs . The UV‐vis spectrum of the N‐CDs in Figure B showed a typical absorbance spectrum in the range of 200 to 400 nm with an obvious peak at approximately 272 nm, which could be attributed to π‐π* of C═C bands in the N‐CDs .…”

Section: Resultsmentioning

confidence: 94%

“…The characteristic band at 1647 cm −1 originated at the C═O group of the N-CDs. 33,34 The UV-vis spectrum of the N-CDs in Figure 2B showed a typical absorbance spectrum in the range of 200 to 400 nm with an obvious peak at approximately 272 nm, which could be attributed to π-π* of C═C bands in the N-CDs. 35 The prepared N-CDs emitted bluish violet color under 365-nm UV lamps ( Figure 2B Figure 3C) originated at the N-C 3 and N-H groups, 37 respectively.…”

Section: Characterizationsmentioning

confidence: 97%

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Crown daisy leaf waste–derived carbon dots: A simple and green fluorescent probe for copper ion

Wang

et al. 2019

Surface & Interface Analysis

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In this paper, N‐doped carbon quantum dots (N‐CDs) were fabricated using crown daisy leaves, a kitchen waste, as carbon source. The synthesized N‐CDs possessed abundant surface functional groups, such as hydroxyl, carboxyl, and amino groups, and had good dispersibility in water. Because of the special fluorescence quenching property toward Cu2+, the synthesized N‐CDs can be exploited as an effective label‐free fluorescent probe for Cu2+ determination. The possible fluorescence sensing mechanism considered the selective coordination interaction between Cu2+ ion and the hydroxyl, carboxyl, and amino groups of the N‐CDs. The control experiments also showed that the N‐doped aromatic C–N heterocycle structure played a crucial role in selective sensing of Cu2+. The decrease in fluorescence efficiencies was linearly related with the Cu2+ concentrations in the range of 10.0nM to 120.0nM, with a response limit of 1.0nM. The prepared probe was also applied for Cu2+ determination in real river water.

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Section: Resultsmentioning

confidence: 94%

Section: Characterizationsmentioning

confidence: 97%

Crown daisy leaf waste–derived carbon dots: A simple and green fluorescent probe for copper ion

Wang

et al. 2019

Surface & Interface Analysis

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“…The study demonstrated that the cooperation between the optimal phase ratio of TiO 2 (anatase/rutile) and rGO produced a positive system in the photocatalytic degradation test with MB other than antibacterial activity. Atchudan et al [208] used a solvothermal method to prepare GO grafting TiO 2 nanocomposites and studied it as a photoactive material under UV-light irradiation in the degradation of MB and methyl orange. The obtained degradation efficiency, compared with only TiO 2 , demonstrated the important function that GO played in the increase of performance due to the increase of light absorption and reducing charge recombination.…”

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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“…Further, its intensity increased with the increase in the GO content and reveals the gradual increase in the wt% of GO in the nanocomposites. [28] The presence of chloride ions may hinder the photocatalytic activity, but the elemental analysis data reveal the absence of chlorine, which shows that the nanocomposites are efficient photocatalysts. [29] The high-resolution transmission electron microscopy (HRTEM) image of NT (Figure 5a) indicates the formation of perfect crystalline particles with a dominant anatase phase (101) along with a clean formation of the characteristic polymorphic circular rings in the SAED pattern (inset).…”

Section: Morphology Studiesmentioning

confidence: 99%

“…Hence, the presence of GO causes the excited electron to transfer toward the conducting carbon network of the GO surface (reaction 2). [28] The electron on the GO network and the positive hole in NT (h + VB ) reacts with oxygen and hydroxyl ion to form superoxide ion and hydroxyl radicals, respectively •or HO • species to generate intermediates, which finally leads to the degradation of indigo carmine (reactions 5-10). [44,45] In the photodegradation reactions, it is suggested that both photoxidation or photosensitized mechanism may occur during light irradiation.…”

Section: Plausible Photocatalytic Mechanismmentioning

confidence: 99%

Graphene oxide–nano‐titania composites for efficient photocatalytic degradation of indigo carmine

Somasekhar

Sanasi

2018

J Chinese Chemical Soc

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Nano‐titania composites assembled with variable weight percentages (wt%) of graphene oxide (GO) were synthesized, and their effectiveness as photocatalysts was investigated for the degradation of indigo carmine under visible light irradiation. Controlled hydrolysis of titanium tetrachloride (TiCl4) was performed in aqueous medium, and 1% aqueous solution of GO was added under ultrasonication. Depending on the wt% of GO, the materials were designated as 1, 2, 5, 10, 15 wt%GO–nano‐titania (GO–NT) composites. Their morphology and structural properties were characterized using X‐ray diffraction (XRD), UV–vis diffuse reflectance spectroscopy (UV–vis DRS), high‐resolution transmission electron microscopy (HRTEM), and field‐emission scanning electron microscopy (FE‐SEM). Excellent photocatalytic activity was demonstrated by the NT composite containing 10%GO in 60 min, and the required optimum conditions were established.

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Effective photocatalytic degradation of anthropogenic dyes using graphene oxide grafting titanium dioxide nanoparticles under UV-light irradiation

Cited by 136 publications

References 51 publications

Crown daisy leaf waste–derived carbon dots: A simple and green fluorescent probe for copper ion

Crown daisy leaf waste–derived carbon dots: A simple and green fluorescent probe for copper ion

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

Graphene oxide–nano‐titania composites for efficient photocatalytic degradation of indigo carmine

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