Graphene-Based Catalysts for Ozone Processes to Decontaminate Water

Beltrán, Fernando J.; Álvarez, Pedro M.; Gimeno, Olga

doi:10.3390/molecules24193438

Cited by 24 publications

(8 citation statements)

References 117 publications

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“…The traditional method to generate hydrogen usually results in high emissions of CO 2 ; thus, it is essential to develop a sustainable and scalable method. For example, in the conventional steam methane reforming process, approximately 12 kg of CO 2 is exhausted per 1 kg of H 2 . , In PR, to produce hydrogen, photogenerated electrons react with the adsorbed H + to produce H 2 . , It is worth mentioning that H 2 production originates from water instead of from the organic substrate, using the mass spectrometry analysis in deuterated and nondeuterated solvents ,, Uekert et al . have shown that the H 2 yield of 11.4 ± 1.2 μmol g –1 is achieved after 5 days of reaction from a grounded commercial PET bottle over a carbon nitride/nickel phosphide PC.…”

Section: Photoreforming Technologymentioning

confidence: 99%

“…73,74 In PR, to produce hydrogen, photogenerated electrons react with the adsorbed H + to produce H 2 . 75,76 It is worth mentioning that H 2 production originates from water instead of from the organic substrate, using the mass spectrometry analysis in deuterated and nondeuterated solvents 20,68,76 Uekert et al 20 have shown that the H 2 yield of 11.4 ± 1.2 μmol g −1 is achieved after 5 days of reaction from a grounded commercial PET bottle over a carbon nitride/nickel phosphide PC. The production activity increases up to 4.13 ± 0.40 mmol g −1 h −1 using CdS as PC.…”

Section: Photoreforming Technologymentioning

confidence: 99%

See 1 more Smart Citation

Recent Advances in the Photoreforming of Plastic Waste: Principles, Challenges, and Perspectives

Tang

Han

Sulaiman

et al. 2023

Ind. Eng. Chem. Res.

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Photoreforming (PR) technology is a green and sustainable approach to tackling the environmental pollution problems generated by plastic waste. In this review, recent advances in the PR of plastic waste are summarized that include the design of photocatalysts, regulations on the products, and innovations on the PR devices and compared to traditional methods. The scientific principles of PR reactions in thermodynamics and kinetics are discussed, and approaches to improve the efficiency of PR reactions are proposed, that involve enhancement in light absorption ability, charge carrier migration/separation efficiency, and surface reaction rate. Particularly, the enhancement for H2 production in the PR reaction is highlighted, and the applications using large-scale reactors are discussed, with advantages and disadvantages of recent reactor configurations. In conclusion, the perspectives on the applications of PR in plastic degradation and hydrogen evolution are given. This review thus comprehensively summarizes scientific principles, challenges, and perspectives of PR reactions on plastic waste to improve the overall efficiency and potential to be applied in the industry.

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Section: Photoreforming Technologymentioning

confidence: 99%

Section: Photoreforming Technologymentioning

confidence: 99%

Recent Advances in the Photoreforming of Plastic Waste: Principles, Challenges, and Perspectives

Tang

Han

Sulaiman

et al. 2023

Ind. Eng. Chem. Res.

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“…Therefore, industrial dye wastewater treatment has received much attention. Among numerous pollutant treatment approaches, photocatalysis is one of the most promising methods for wastewater treatment [2][3][4]. In recent years, Bi-based photocatalysts have attracted much attention [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Visible-light-driven photocatalytic degradation of rhodamine B using Bi2WO6/GO deposited on polyethylene terephthalate fabric

Cui

Zhang

et al. 2020

J Leather Sci Eng

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The environmental repercussions of wastewater from the dye process mean that it is very important to obtain an eco-friendly photocatalyst that would degrade wastewater. Herein, bismuth tungstate/graphene oxide (Bi2WO6/GO) composites are fabricated through in-situ hydrothermal reaction and then the Bi2WO6/GO photocatalysts are deposited onto polyethylene terephthalate (PET) fabric. The obtained Bi2WO6/GO deposited PET fabrics are then characterized through XPS, Raman, SEM, TEM, XRD, UV-vis, BET method and photoluminescence spectroscopy (PL) to investigate their chemical and crystal structures, morphology, optical property, surface area and photochemical properties. Photocatalytic performance is studied through examining the rate of degrading rhodamine B (RhB) under visible light. Surface of PET fibers is densely covered with Bi2WO6/GO. Bi2WO6/GO deposited PET fabrics show a broad absorption band in the visible spectra. Removal rate of RhB on the Bi2WO6/GO deposited PET fabric is the highest with the GO content of 2 g/L (labeled as Bi2WO6/2 g/LGO). The result of active species experiment shows that superoxide radicals (·O2−) plays a major role in the degradation of RhB. Moreover, Bi2WO6/2 g/LGO deposited PET fabric shows excellent cycle stability of photocatalytic degradation for RhB. The findings in this work can be extended to preparation other types of composite on the textile for photocatalysis, which can be applied to remove dyes in the wastewater produced by the textile or leather industry. Graphical abstract

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“…Graphene discovered in 2004-a 2D material with significant optical, conductivity, and electronic properties, among others [22]-is also investigated. TiO 2 doping with graphene oxide, confers it the possibility of reducing the band gap and, hence, the increase of visible light absorption [23]. Additionally, some works have already been published on the use of UVA or visible light emitting diodes (visLED) to substitute artificial UV lamps [24,25].…”

Section: Introductionmentioning

confidence: 99%

“…However, few works deal with studies on the kinetics of the process. In many cases, the kinetics are oversimplified just determining pseudo first order rate constants [23,[31][32][33][34]. Other investigations are limited to find out through which mechanism the oxidation occurs, different scavengers that react with reactive oxygen species (ROS)-such as hydroxyl radicals, singlet oxygen, positive holes in the valence band, etc.-are therefore applied [27,35].…”

Section: Introductionmentioning

confidence: 99%

Modeling the Mineralization Kinetics of Visible Led Graphene Oxide/Titania Photocatalytic Ozonation of an Urban Wastewater Containing Pharmaceutical Compounds

Beltrán¹,

Checa²,

Rivas³

et al. 2020

Catalysts

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In a water ozonation process, dissolved organics undergo two reactions at least: direct ozone attack and oxidation with hydroxyl radicals generated from the ozone decomposition. In the particular case of urban wastewater contaminated with pharmaceuticals, competition between these two reactions can be studied through application of gas–liquid reaction kinetics. However, there is a lack in literature about kinetic modeling of ozone processes in water specially in photocatalytic ozonation. In this work, lumped reactions of ozone and hydroxyl radicals with total organic carbon have been proposed. Urban wastewater containing a mixture of eight pharmaceutical compounds has been used to establish the kinetic model that simulates the mineralization process. The kinetic model is based on a mechanism of free radical and molecular reactions and the knowledge of mass transfer, chemical reaction rate constants, and radiation transfer data. According to the model, both single ozonation and photocatalytic ozonation present two distinct reaction periods characterized by the absence and presence of dissolved ozone. In the first period (less than 10 min), pharmaceuticals mainly disappear by direct ozone reactions and TOC variation due to these compounds has been modeled according to gas–liquid reaction kinetics through a lumped ozone-pharmaceutical TOC fast second order reaction. The corresponding rate constant of this reaction was found to change with time from 3 × 105 to 200 M−1 s−1 with Hatta values higher than 0.3. In the second period (nearly 5 h), competition between direct and hydroxyl radical reactions takes place and a kinetic model based on a direct and free radical reaction mechanism is proposed. Main influencing parameters to be known were: Direct ozone reaction rate constant, catalyst quantum yield, and hydroxyl radical scavengers. The first two take values of 0.5 M−1 s−1 and 5 × 10−4 mol·photon−1, respectively, while a fraction of TOC between 10% and 90% that changes with time was found to possess hydroxyl radical scavenger nature.

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Graphene-Based Catalysts for Ozone Processes to Decontaminate Water

Cited by 24 publications

References 117 publications

Recent Advances in the Photoreforming of Plastic Waste: Principles, Challenges, and Perspectives

Recent Advances in the Photoreforming of Plastic Waste: Principles, Challenges, and Perspectives

Visible-light-driven photocatalytic degradation of rhodamine B using Bi2WO6/GO deposited on polyethylene terephthalate fabric

Modeling the Mineralization Kinetics of Visible Led Graphene Oxide/Titania Photocatalytic Ozonation of an Urban Wastewater Containing Pharmaceutical Compounds

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