Fabrication of g-C3N4/TiO2 heterojunction composite for enhanced photocatalytic hydrogen production

Alcudia-Ramos, M.A.; Fuentez-Torres, Manuel Octavio; Ortíz‐Chi, Filiberto; Espinosa‐González, Claudia G.; Hernández‐Como, N.; García-Zaleta, D.S.; Kesarla, Mohan Kumar; Torres‐Torres, Gilberto; Collins-Martı́nez, V.; Godavarthi, Srinivas

doi:10.1016/j.ceramint.2019.08.228

Cited by 162 publications

(58 citation statements)

References 44 publications

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“…The X-Ray diffraction (XRD) patterns of the nZVI, TiO2, g-C3N4, g-C3N4/TiO2 and nZVI-g-C3N4/TiO2 composite were shown in Figure . 1. Typical characteristic diffraction patterns of pure g-C3N4 appeared at 27.2° (2θ) and corresponded to (0 0 2) hexagonal crystal planes, which was consistent with the results in the literature [39]. The diffraction peaks of pure TiO2 appeared at Fig.…”

Section: Characterizationsupporting

confidence: 90%

A Study on the Mechanism and Kinetic of Nitrate Reduction by the nZVI-g-C3N4/TiO2  Composite Under the Simulated Sunlight

Wei

Tian

Wang

et al. 2021

Preprint

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g-C3N4/TiO2 composite has excellent photoelectric properties and is considered as a good carrier of nanoparticles. A novel composite of nZVI-g-C3N4/TiO2 was successfully synthesized through in-situ growth nZVI on the surface of g-C3N4/TiO2 with liquid phase reduction method. The composite was characterized by TEM, XRD, EDS and evaluated its nitrate removal efficiency. The effects of composite dosage, solution initial pH and HCOOH concentration on nitrate reduction were investigated. The results showed that nitrate was rapidly reduced by nZVI-g-C3N4/TiO2 composite. The dosage of 4 g/L nZVI-g-C3N4/TiO2 composite and 3.0 mM of HCOOH concentration was more suitable for nitrate reduction. Solution initial pH had little impact on the nitrate reduction efficiency, but affected the proportion of the nitrate reduction products. The mechanism of nitrate reduction in the nZVI-gC3N4/TiO2/HCOOH-Xe-lamp system was proposed. The nZVI-gC3N4/TiO2 composite could be considered as a viable and promising technology for water pollution remediation.

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Section: Characterizationsupporting

confidence: 90%

A Study on the Mechanism and Kinetic of Nitrate Reduction by the nZVI-g-C3N4/TiO2  Composite Under the Simulated Sunlight

Wei

Tian

Wang

et al. 2021

Preprint

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“…Although special efforts are being made to synthesize noble-metal free nanocomposites, there is still widespread use of Pt as a co-catalyst in H 2 evolution reactions. Except for the already mentioned TiO 2−x /CNNS photocatalyst [84], TiO 2 /g-C 3 N 4 composites with the use of photodeposited Pt as co-catalyst reached HER of 4128 µmol/h/g [87] and 1041 µmol/h/g [83] under solar and visible light irradiation, respectively. Pan et al [88] also exhibited a high HER of 13800 µmol/h/m 2 by the use of Pt as a co-catalyst with g-C 3 N 4 /TiO 2 nanofilm.…”

Section: Tio 2 /G-c 3 Nmentioning

confidence: 93%

“…Graphitic carbon nitride (g-C 3 N 4 ), a two-dimensional, metal-free polymeric π-conjugated semiconductor material, which has attracted a lot of attention [83][84][85][86][87][88][89][90][91] since the pioneering work of Wang et al [92] in 2009, due to its high stability, visible light response with the bandgap of 2.7 eV and non-toxicity [93], thus representing a viable candidate to be applied in photocatalytic water treatment [80], has certainly been one of the most investigated photocatalysts inside carbon-based nanomaterials. It can be easily synthesized through the direct pyrolysis of nitrogen-rich precursors, such as melamine, cyanamide, dicyandiamide, and urea, but its practical application and principle drawback is low specific surface area and high rate of electron-hole recombination [83,94,95]. Therefore, g-C 3 N 4 modification to address shortcomings are needed, e.g., as an excellent candidate to form heterojunction with TiO 2 (Type II Heterojunction), due to their matched band positions (VB and CB).…”

Section: Tio 2 /G-c 3 Nmentioning

confidence: 99%

Recent Achievements in Development of TiO2-Based Composite Photocatalytic Materials for Solar Driven Water Purification and Water Splitting

et al. 2020

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Clean water and the increased use of renewable energy are considered to be two of the main goals in the effort to achieve a sustainable living environment. The fulfillment of these goals may include the use of solar-driven photocatalytic processes that are found to be quite effective in water purification, as well as hydrogen generation. H2 production by water splitting and photocatalytic degradation of organic pollutants in water both rely on the formation of electron/hole (e−/h+) pairs at a semiconducting material upon its excitation by light with sufficient photon energy. Most of the photocatalytic studies involve the use of TiO2 and well-suited model compounds, either as sacrificial agents or pollutants. However, the wider application of this technology requires the harvesting of a broader spectrum of solar irradiation and the suppression of the recombination of photogenerated charge carriers. These limitations can be overcome by the use of different strategies, among which the focus is put on the creation of heterojunctions with another narrow bandgap semiconductor, which can provide high response in the visible light region. In this review paper, we report the most recent advances in the application of TiO2 based heterojunction (semiconductor-semiconductor) composites for photocatalytic water treatment and water splitting. This review article is subdivided into two major parts, namely Photocatalytic water treatment and Photocatalytic water splitting, to give a thorough examination of all achieved progress. The first part provides an overview on photocatalytic degradation mechanism principles, followed by the most recent applications for photocatalytic degradation and mineralization of contaminants of emerging concern (CEC), such as pharmaceuticals and pesticides with a critical insight into removal mechanism, while the second part focuses on fabrication of TiO2-based heterojunctions with carbon-based materials, transition metal oxides, transition metal chalcogenides, and multiple composites that were made of three or more semiconductor materials for photocatalytic water splitting.

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“…In addition, work performed with TEOA over TiO 2 and C 3 N 4 revealed that this substrate was more photoactive on TiO 2 , suggesting that the photomechanism proceeds via the electron density located on the N atom of the amine group [100], although more details of the mechanistic pathways have not been investigated. When TEOA is used as a sacrificial hole scavenger over an N-acetylethanol-amine modified carbon nitride photocatalyst, a remarkable hydrogen evolution rate of 22,043 μmol h −1 g cat −1 is achieved [77], which far exceeds a similar unmodified g-C 3 N 4 /TiO 2 photocatalyst which achieved 1041 μmol h −1 g cat −1 by comparison [79].…”

Section: Aminesmentioning

confidence: 94%

Photocatalytic hydrogen evolution from biomass conversion

et al. 2021

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Biomass has incredible potential as an alternative to fossil fuels for energy production that is sustainable for the future of humanity. Hydrogen evolution from photocatalytic biomass conversion not only produces valuable carbon-free energy in the form of molecular hydrogen but also provides an avenue of production for industrially relevant biomass products. This photocatalytic conversion can be realized with efficient, sustainable reaction materials (biomass) and inexhaustible sunlight as the only energy inputs. Reported herein is a general strategy and mechanism for photocatalytic hydrogen evolution from biomass and biomass-derived substrates (including ethanol, glycerol, formic acid, glucose, and polysaccharides). Recent advancements in the synthesis and fundamental physical/mechanistic studies of novel photocatalysts for hydrogen evolution from biomass conversion are summarized. Also summarized are recent advancements in hydrogen evolution efficiency regarding biomass and biomass-derived substrates. Special emphasis is given to methods that utilize unprocessed biomass as a substrate or synthetic photocatalyst material, as the development of such will incur greater benefits towards a sustainable route for the evolution of hydrogen and production of chemical feedstocks.

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Fabrication of g-C3N4/TiO2 heterojunction composite for enhanced photocatalytic hydrogen production

Cited by 162 publications

References 44 publications

A Study on the Mechanism and Kinetic of Nitrate Reduction by the nZVI-g-C3N4/TiO2  Composite Under the Simulated Sunlight

A Study on the Mechanism and Kinetic of Nitrate Reduction by the nZVI-g-C3N4/TiO2  Composite Under the Simulated Sunlight

Recent Achievements in Development of TiO2-Based Composite Photocatalytic Materials for Solar Driven Water Purification and Water Splitting

Photocatalytic hydrogen evolution from biomass conversion

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Fabrication of g-C3N4/TiO2 heterojunction composite for enhanced photocatalytic hydrogen production

Cited by 162 publications

References 44 publications

A Study on the Mechanism and Kinetic of Nitrate Reduction by the nZVI-g-C3N4/TiO2&nbsp; Composite Under the Simulated Sunlight

A Study on the Mechanism and Kinetic of Nitrate Reduction by the nZVI-g-C3N4/TiO2&nbsp; Composite Under the Simulated Sunlight

Recent Achievements in Development of TiO2-Based Composite Photocatalytic Materials for Solar Driven Water Purification and Water Splitting

Photocatalytic hydrogen evolution from biomass conversion

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Product

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About

A Study on the Mechanism and Kinetic of Nitrate Reduction by the nZVI-g-C3N4/TiO2 Composite Under the Simulated Sunlight

A Study on the Mechanism and Kinetic of Nitrate Reduction by the nZVI-g-C3N4/TiO2 Composite Under the Simulated Sunlight