Optical and highly enhanced solar light-driven photocatalytic activity of reduced graphene oxide wrapped α-MoO3 nanoplates

Ramar, Venkadeshkumar; Karthikeyan, B.

doi:10.1016/j.solener.2019.10.037

Cited by 32 publications

(12 citation statements)

References 61 publications

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“…On the other hand, the band located at 586 cm −1 corresponded to the stretching vibration of the Fe-O links in tetrahedral locations of the cobalt spinel structure-CoFe 2 O 4as reported previously [23][24][25][26]. Likewise, there were characteristic bands of MoO 3 at 993 cm −1 due to vibrations in the Mo=O bonds within the molecule, and at 859 cm −1 due to Mo-O-Mo bonds that connect the different molecules [27,28].…”

Section: Oxide Characterizationsupporting

confidence: 67%

Characterization Study of an Oxide Film Layer Produced under CO2/Steam Atmospheres on Two Different Maraging Steel Grades

Florez

Fargas

Rovira

et al. 2021

Metals

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Currently, surface treatments lead to inducing a superficial layer of several nanometers up to micrometer, which in some cases can be protective. In this experimental work, an oxide layer was generated under different atmospheres (CO2 and steam atmospheres) during the thermal aging treatment of two different maraging grades, 300 and 350. Afterwards, this layer was microstructural and mechanically characterized by advanced characterization techniques at the micro- and submicron length scale to highlight some information related to the generated oxide layer. The results showed that the oxide layer (in both grades) was made up of several compounds like: TiO2, MoO3, hematite (α-Fe2O3), and CoFe2O4, this being the majority compound distributed homogeneously throughout the layer. Furthermore, a nickel-rich austenitic phase at the interphase was mainly made up cobalt ions (Co2+), instead of iron ions (Fe2+), within the spinel lattice.

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Section: Oxide Characterizationsupporting

confidence: 67%

Characterization Study of an Oxide Film Layer Produced under CO2/Steam Atmospheres on Two Different Maraging Steel Grades

Florez

Fargas

Rovira

et al. 2021

Metals

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“…However, the photogenerated holes can produce hydroxyl radicals (•OH) by oxidizing the water. 51 This thermodynamically favorable indirect transition may delay the rate of electron−hole recombination. Photoluminescence spectra of rGO/WO 3 show the decrement in the emission intensity which also supports the delay in the electron−hole recombination rate.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The degradation rate constant ( k ) of the prepared catalyst was studied using the pseudo-first-order kinetic plots. The following expression was applied to estimate the rate constant values of the samples, , where k represents the rate constant. K represents the adsorption constant.…”

Section: Photocatalysismentioning

confidence: 99%

“…The excited state electrons can be trapped by the oxygen molecule which can produce the reactive oxygen species (ROS) hydrogen peroxide or superoxide anion radicals (•O 2 – ). However, the photogenerated holes can produce hydroxyl radicals (•OH) by oxidizing the water . This thermodynamically favorable indirect transition may delay the rate of electron–hole recombination.…”

Section: Photocatalysismentioning

confidence: 99%

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Reduced Graphene Oxide/WO₃ Nanorod Composites for Photocatalytic Degradation of Methylene Blue under Sunlight Irradiation

Ramar

Karthikeyan

2021

ACS Appl. Nano Mater.

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The addition of reduced graphene oxide (rGO) into semiconducting metal oxide nanomaterials is a trending material that has been used in a wide range of applications to improve the efficiency of metal oxides. In this present work, we synthesize rGO/WO3 nanohybrids via a simple one-step hydrothermal route. During the hydrothermal treatment, the subsequent in situ reduction of GO into rGO occurred in Millipore water without using any surfactant or reducing agents. A high-resolution transmission electron microscope investigated the morphology of the prepared samples. The phase formation was confirmed by X-ray diffraction pattern and Raman spectroscopy. To assess the photocatalytic activity, prepared samples were used to suppress methylene blue (MB) dye under sunlight irradiation. From the results, the WR3 (i.e., WO3 + 30 mg GO) shows a higher catalytic activity for MB degradation. The constant rate values of WR3 (i.e., WO3 + 30 mg GO) also increased to ∼6.5 times compared to WO3. The enhanced catalytic activity of the prepared samples is due to the synergistic effect induced electron–hole recombination delay in the nanocomposites, which is confirmed from the photoluminescence spectroscopy. To probe the active species involved in photocatalysis, in situ scavenger studies were done. A two-route photocatalytic mechanism was proposed to explain the photocatalytic reaction.

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“…This graphene has several unique properties, such as high optical transmittance (∼97.7%), outstanding thermal conductivity (∼5 × 10 3 W m –1 K –1 ), strong Young’s modulus (∼1.0 TPa), high intrinsic mobility of charge (2 × 10 5 ), and high theoretical surface area (2630 m 2 g –1 ). Such a graphene has been widely used in many applications, like degradation of organic pollutants, optical power limiting, heavy metal removal, sensors, fuel cells, batteries, supercapacitors, solar cells, etc. − This graphene material can synthesized through various methods, such as oxidation techniques, microwave-assisted exfoliation, liquid-phase exfoliation, solvothermal production, epitaxial method, etc.…”

Section: Carbon Nanomaterialsmentioning

confidence: 99%

Critical Review on Carbon-Based Nanomaterial for Carbon Capture: Technical Challenges, Opportunities, and Future Perspectives

Ramar¹,

Ambedkar²

2022

Energy Fuels

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In the 21st century, climate change and global warming are considered to be one of the world’s most severe and biggest environmental threats to humans. Consequently, the CO2 capture and storage technique has been a concern as a superior technique by both industrial and academic research communities, which prohibits the mixing of CO2 from point sources, such as cement plants and fossil fuel power plants, into the atmosphere. Particularly, after the United Nations Climate Change Conference in 2015, which was held in Paris, France, researchers have been vigorously focusing on the reduction of greenhouse gases. Presently, liquid amine scrubbing has been used for CO2 capture technology, while solid sorbents are used for CO2 capture technology to overcome the drawbacks associated with amine scrubbing technology. In this review, different carbon nanomaterials, such as fullerene, carbon nanotubes, graphene oxide, biochar, and activated carbon, and their derivatives for CO2 capture applications are summarized. In addition, the review covers the fundamental requirements of solid sorbents, advantages and disadvantages of other solid sorbents, and policies proposed for reducing greenhouse gas emissions by developing and developed countries, which will be highly beneficial for making future policies and fabricating low-cost CO2 sorbents. Finally, the current technical challenges and opportunities for the development of efficient and practically possible carbon-based CO2 sorbents were discussed. Furthermore, future perspectives were proposed for the development of carbonaceous porous materials in place of existing liquid amine scrubbing technology in the future.

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Optical and highly enhanced solar light-driven photocatalytic activity of reduced graphene oxide wrapped α-MoO3 nanoplates

Cited by 32 publications

References 61 publications

Characterization Study of an Oxide Film Layer Produced under CO2/Steam Atmospheres on Two Different Maraging Steel Grades

Characterization Study of an Oxide Film Layer Produced under CO2/Steam Atmospheres on Two Different Maraging Steel Grades

Reduced Graphene Oxide/WO₃ Nanorod Composites for Photocatalytic Degradation of Methylene Blue under Sunlight Irradiation

Critical Review on Carbon-Based Nanomaterial for Carbon Capture: Technical Challenges, Opportunities, and Future Perspectives

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Optical and highly enhanced solar light-driven photocatalytic activity of reduced graphene oxide wrapped α-MoO3 nanoplates

Cited by 32 publications

References 61 publications

Characterization Study of an Oxide Film Layer Produced under CO2/Steam Atmospheres on Two Different Maraging Steel Grades

Characterization Study of an Oxide Film Layer Produced under CO2/Steam Atmospheres on Two Different Maraging Steel Grades

Reduced Graphene Oxide/WO3 Nanorod Composites for Photocatalytic Degradation of Methylene Blue under Sunlight Irradiation

Critical Review on Carbon-Based Nanomaterial for Carbon Capture: Technical Challenges, Opportunities, and Future Perspectives

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Product

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Reduced Graphene Oxide/WO₃ Nanorod Composites for Photocatalytic Degradation of Methylene Blue under Sunlight Irradiation