Hummers’ and Brodie’s graphene oxides as photocatalysts for phenol degradation

Pedrosa, Marta; Silva, Eliana S. Da; Pastrana‐Martínez, Luisa M.; Dražić, Goran; Falaras, Polycarpos; Faria, Joaquim L.; Figueiredo, José L.; Silva, Adrián M.T.

doi:10.1016/j.jcis.2020.01.093

Cited by 60 publications

(29 citation statements)

References 76 publications

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“…[16] The results in figure 2a showed that the bandgap energy values of TiO2/rGO materials were all less than P25 (3.23 eV), suggesting that the doping of TiO2 onto rGO sheets could narrow the bandgap of TiO2. [17] The interaction between TiO2 and carbonaceous material greatly facilitated the overwhelming recombination of electron-hole pairs due to the convenient charge transportation in the π delocalized region and multiple oxygen-containing functional groups in the carbon-carbon site. [18] Besides, as the volume of TIP used increases, the bandgap energy increases due to the increase in the amount of TiO2 forming on the rGO (table 1).…”

Section: Characterization Of Nanocompositesmentioning

confidence: 99%

Binary TiO₂/reduced graphene oxide nanocomposite for improving methylene blue photodegradation

Trinh

Viet

Nhu

et al. 2021

Vietnam Journal of Chemistry

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Herein, TiO2/reduced graphene oxide (TiO2/rGO) nanocomposites were fabricated using the hydrothermal method and investigated with the amount of titanium precursors. The binary nanocomposites were characterized by modern analysis method. The adsorption capacity and photocatalyst degradation were performed based on methylene blue. The appropriate as‐prepared material with 1.5 mL TIP contained a large specific surface area (110.549 m2/g) with TiO2 ranging 4‐25 nm homogenously grafting on the rGO surface. The adsorption results were shown in good accordance with the pseudo‐second‐order while the photoreaction kinetics pursued the pseudo‐first‐order with a high‐rate constant. After the adsorption state, the yield reaches 62.1 % and under UV light for 90 min, 96.8 % of MB was efficiently degraded from water media, which showed a more impressive effect as compared with P25 and rGO. Therefore, the use of TiO2/rGO could be applied in the mass‐scale treatment of organic pollutants in wastewater.

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Section: Characterization Of Nanocompositesmentioning

confidence: 99%

Binary TiO₂/reduced graphene oxide nanocomposite for improving methylene blue photodegradation

Trinh

Viet

Nhu

et al. 2021

Vietnam Journal of Chemistry

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“…In order to clarify the enhanced degradation mechanism of the Acid Black by the newly developed Fe‐based MOFs/polymer composites, photocatalysis under different atmospheres (Air and N 2 ) and radical‐trapping experiments were carried out. In this study, EDTA, [57,58] isopropanol, [59] MEHQ [60] and TEMPO [61] were used as scavengers of h + , Hydroxyl radicals ( • OH), oxygen active species (RO • and ROO • ) and carbon centered radicals, respectively. The trappers’ concentrations were equal to 1 mM and their impacts on the Acid Black photodegradation were identified by monitoring this dye concentration under UV‐Visible lamp…”

Section: Resultsmentioning

confidence: 99%

“…In order to clarify the enhanced degradation mechanism of the Acid Black by the newly developed Fe-based MOFs/polymer composites, photocatalysis under different atmospheres (Air and N 2 ) and radical-trapping experiments were carried out. In this study, EDTA, [57,58] isopropanol, [59] MEHQ [60] and TEMPO [61] were used as scavengers of h + , Hydroxyl radicals ( À , formed by the reaction between the excited e À and the O 2 dissolved in the solution, during the photocatalytic process. This was in agreement with the high Acid Black removal rates obtained after adding the EDTA into the aqueous solution.…”

Section: Proposed Photocatalytic Degradation Routementioning

confidence: 99%

New Hybrid Fe‐based MOFs/Polymer Composites for the Photodegradation of Organic Dyes

et al. 2021

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Metals Organic Frameworks (MOFs) are promising crystalline, embrittled materials generally produced in powdering form with varied remarkably functionalities. In contrary, polymers are flexible and processable materials. Therefore, obtaining shaped solids gathering polymer malleability and MOFs properties such as their photocatalytic activities, have attracted many researchers' attention. This work, reports the successful fruitful incorporation of two different Fe-based MOFs into a polymer matrix via a facile and cheap photopolymerization process upon mild visible light irradiation at 405 nm. The as-prepared photocomposites display excellent stability and photocatalytic performance for several Acid Black degradation cycles. Hence, approximatively, 95 % of this model dye is decomposed by the two MIL-100(Fe)/polymer and MIL-88 A(Fe)/polymer composites under just 30 min of UV-Visible lamp irradiation. Incorporation of the MOFs into the polymer is confirmed by several techniques including Scanning Electron Microscopy (SEM), Energy-Dispersive X-ray analysis (EDX), Transmission Electron Microscopy (TEM), X-Ray Diffraction analysis (DRX), Fourier-Transform Infrared Spectroscopy (FTIR). Furthermore, these photocatalysts exhibit a high thermal stability, excellent rigidity and low band gap energy characterized by Thermogravimetric Analysis (TGA), Atomic Force Microscopy (AFM), Dynamic Mechanical Analysis (DMA) and UV-Visible diffuse reflectance spectroscopy, respectively.

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“…Nevertheless, the optimization of the electronic properties of graphene is a critical topic today and growing interest has been devoted to the use of heteroatom-doped graphene (rather than the addition of noble metals) to produce high-performance photocatalytic composites under visible light. Chemical doping with heteroatoms such as oxygen (O) [ 26 ], nitrogen (N) [ 27 , 28 , 29 ], boron (B) [ 30 ], phosphorus (P) [ 31 ], or sulfur (S) [ 32 , 33 ], etc., can improve the photocatalytic performance of graphene materials by tailoring its electronic properties [ 34 ] and increasing their reactive catalytic sites to be used such as catalysts supports or even as a photocatalyst on their own [ 35 ].…”

Section: Introductionmentioning

confidence: 99%

Functionalized Graphene Derivatives and TiO2 for High Visible Light Photodegradation of Azo Dyes

et al. 2020

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Functionalized graphene derivatives including graphene oxide (GO), reduced graphene oxide (rGO), and heteroatom (nitrogen/sulphur (N/S) or boron (B))-doped graphene were used to synthesize composites with TiO2 (T). The photocatalytic performance of composites was assessed for the degradation of Orange G dye (OG) under simulated solar light. All the prepared graphene derivatives—TiO2 composites showed better photocatalytic performance than bare TiO2. A higher photocatalytic activity was found for the composites containing GO and N/S co-doped rGO (kapp = 109.2 × 10−3 and 48.4 × 10−3 min−1, for GO-T and rGONS-T, respectively). The influence of both initial solution pH and the reactive species involved in the OG degradation pathway were studied. The photocatalytic activity of the samples decreased with the increase of the initial pH (from 3.0 to 10.0) due to the occurrence of electrostatic repulsive forces between the photocatalysts surface and the molecules of OG, both negatively charged. The use of selective scavengers showed that although the photogenerated holes dominate the degradation mechanism, radicals and singlet oxygen also participate in the OG degradation pathway. In addition, reutilization experiments indicated that the samples were stable under the reaction conditions used.

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Hummers’ and Brodie’s graphene oxides as photocatalysts for phenol degradation

Cited by 60 publications

References 76 publications

Binary TiO₂/reduced graphene oxide nanocomposite for improving methylene blue photodegradation

Binary TiO₂/reduced graphene oxide nanocomposite for improving methylene blue photodegradation

New Hybrid Fe‐based MOFs/Polymer Composites for the Photodegradation of Organic Dyes

Functionalized Graphene Derivatives and TiO2 for High Visible Light Photodegradation of Azo Dyes

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Hummers’ and Brodie’s graphene oxides as photocatalysts for phenol degradation

Cited by 60 publications

References 76 publications

Binary TiO2/reduced graphene oxide nanocomposite for improving methylene blue photodegradation

Binary TiO2/reduced graphene oxide nanocomposite for improving methylene blue photodegradation

New Hybrid Fe‐based MOFs/Polymer Composites for the Photodegradation of Organic Dyes

Functionalized Graphene Derivatives and TiO2 for High Visible Light Photodegradation of Azo Dyes

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Binary TiO₂/reduced graphene oxide nanocomposite for improving methylene blue photodegradation

Binary TiO₂/reduced graphene oxide nanocomposite for improving methylene blue photodegradation