Aloe-vera flower shaped rutile TiO2 for selective hydrogenation of nitroaromatics under direct sunlight irradiation

Singh, Satnam; Prajapat, Roopchand; Rather, Rayees Ahmad; Pal, Bonamali

doi:10.1016/j.arabjc.2018.04.002

Cited by 10 publications

(4 citation statements)

References 54 publications

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“…[ 32 ] Based on the spectra in Figure 3b, P 25 exhibits peaks at 25.14°, 36.76°, 37.73°, 38.39°, 47.77°, 53.76°, 54.98°, 68.72°, 70.05°, 74.66°, and 75.51°, which correspond to the (101), (103), (004), (112), (200), (105), (211), (116), (220), (215), and (301) plans of anatase TiO 2 according to (JCPDS file 01‐071‐1167) and other previous reports. [ 45,46 ] Further, the peaks appeared at 27.28, 36.01, 41.05, 43.82, and 62.63°are ascribed to (110), (101), (111), (210), and (002) confirmed the presence of rutile TiO 2 (JCPDS file 01‐076‐0649). [ 45,46 ] Although HP 25 shows a similar XRD pattern to P 25, it is noticed that H 2 annealing enhances the phase crystallinity, as revealed from the higher intensity of both anatase and rutile assigned peaks.…”

Section: Resultsmentioning

confidence: 96%

“…[ 45,46 ] Further, the peaks appeared at 27.28, 36.01, 41.05, 43.82, and 62.63°are ascribed to (110), (101), (111), (210), and (002) confirmed the presence of rutile TiO 2 (JCPDS file 01‐076‐0649). [ 45,46 ] Although HP 25 shows a similar XRD pattern to P 25, it is noticed that H 2 annealing enhances the phase crystallinity, as revealed from the higher intensity of both anatase and rutile assigned peaks. According to recent reports, the XRD pattern of VO x confirms its perfect synthesis in the nanotubular carbon framework.…”

Section: Resultsmentioning

confidence: 99%

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Optimized V‐Doped Defective TiO₂/α‐(Fe₂O₃)_1‐x(Cr₂O₃)_x Heterojunctions for Photo‐Assisted Supercapacitor Devices: Insights on the Materials Integrity and Dual Conversion‐Storage Mechanism

Sayed,

Bahnasawy,

Allam

2023

Adv Materials Inter

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Energy conversion and storage integrated power units suffer from multiple engineering issues. Replacing two devices (solar cell and supercapacitor assembly) with one device (photo‐enhanced supercapacitor‐ PSC) requires materials with emerged dual solar‐electrochemical storage attributes. Herein, a propitious approach is developed to fabricate all visible light‐enhanced semisolid flexible PCS. Nanoflakes‐based p‐n junction α‐(Fe2O3)1‐x(Cr2O3)x photocathode is synthesized directly on industrial waste stainless steel mesh (316L‐SS). Alongside, three TiO2‐based electrodes are utilized as positive photoactive electrodes. Tuning the optical properties of TiO2 is displayed via doping with mixed valence vanadium (V4+/V5+) together with thermal hydrogen annealing. This is revealed via the reduction of the bandgap energy from 2.89 to 2.15 eV, which can be ascribed to the induced oxygen vacancies. The device can sustain up to 1.6 V potential window with 91% stability after 350 successive charge/discharge cycles with the possibility of performance regeneration to its 100% retention. An illustration of the photo‐storage mechanism is proposed based on the X–ray photoelectron spectroscopy, X–ray crystallography, and band position/alignment results. Quasi‐reversible water splitting/formation is concluded as the main storage mechanism in the semisolid state electrolyte under illumination conditions.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Optimized V‐Doped Defective TiO₂/α‐(Fe₂O₃)_1‐x(Cr₂O₃)_x Heterojunctions for Photo‐Assisted Supercapacitor Devices: Insights on the Materials Integrity and Dual Conversion‐Storage Mechanism

Sayed,

Bahnasawy,

Allam

2023

Adv Materials Inter

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“…Other than invoking polymorphism and doping to alter the band positions, surface modification, spatial charge separation, and rate of electron–hole recombination also play important roles in determining the efficacy of the nitroarenes reduction. Makarova et al studied the effect of surface modification of TiO 2 by special chelating agents (like arginine, lauryl sulfate, and salicylic acid) for photocatalytic reduction of nitrobenzene. , Arginine-modified TiO 2 showed higher nitrobenzene adsorption and photodecomposition compared to pristine and other surface-modified TiO 2 .…”

Section: Photocatalytic Reduction Of Nitroarenesmentioning

confidence: 99%

“…The plasmonic metal on TiO 2 behaves as an electron trap center, whereas the Ru dyes on TiO 2 , upon light absorption, push the photoexcited electrons to CB of TiO 2 , and further mediate the reduction of nitroarene substrates to anilines (Figure 4b). 61 Other than invoking polymorphism and doping to alter the band positions, surface modification, 62 spatial charge separation, and rate of electron−hole recombination also play important roles in determining the efficacy of the nitroarenes reduction. Makarova et al studied the effect of surface modification of TiO 2 by special chelating agents (like arginine, lauryl sulfate, and salicylic acid) for photocatalytic reduction of nitrobenzene.…”

Section: Photocatalytic Reduction Of Nitroarenesmentioning

confidence: 99%

Photocatalytic Materials for Reduction of Nitroarenes and Nitrates

Roy

2020

J. Phys. Chem. C

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This Mini-Review Article is a critical compendium of recent advances in the photocatalytic reduction of the priority pollutants nitroarenes and aqueous nitrate over various semiconducting materials. The photocatalytic reduction of nitroarenes produces useful industrial intermediate compounds, whereas the photocatalytic reduction of aqueous nitrates leads to the formation of harmless N 2 or NH 3 as a potential alternative to the Haber−Bosch process. This Mini-Review Article looks at the physical chemistry aspects of the photocatalytic materials as well as their respective optical band structure, surface morphology, size, crystalline structure, and polymorphic phases. The photocatalysts are categorized into five major segments: (a) band-engineered semiconducting photocatalysts, (b) quantum dots, (c) anionic and transition-metal-doped photocatalysts for optimum mid-gap states, (d) organic dyes or plasmonic metal-supported photocatalysts, and (e) photocatalysts with heterojunctions. Pristine and doped band-engineered TiO 2 stands out as the most explored class of materials for photoreduction of nitroarenes and nitrates. Other semiconductor oxides, like perovskites, layered graphitic-C 3 N 4 , graphene derivatives, and chalcogenides, are also discussed in this Mini-Review Article. The mechanistic details of the photocatalytic reduction of nitroaromatics and aqueous nitrates in correlation with the materials' physical properties are critically explored, with an overall conclusion at the end.

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Photocatalytic Transformation of Organics to Valuable Chemicals – Quo Vadis?

Adamowicz,

Yaemsunthorn,

Kobielusz

et al. 2024

ChemPlusChem

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Recent development in photocatalysis is increasingly focused on transforming organic compounds toward producing fine chemicals. Simple, non‐selective oxidation reactions (degradation of pollutants) and very demanding solar‐to‐chemical energy conversion processes (production of solar fuels) face severe economic limitations influenced by still low efficiency and insufficient stability of the systems. Synthesis of fine chemicals, including reductive and oxidative selective transformations, as well as C‐C and C‐N coupling reactions, can utilise the power of photocatalysis. Herein, we present the recent progress in photocatalytic systems designed to synthesise fine chemicals. In particular, we discuss the factors influencing the efficiency and selectivity of the organic transformations, dividing them into intrinsic (related to individual properties of photocatalysts) and extrinsic (originating from the reaction environment). A rational design of the photocatalytic systems, based on a deep understanding of these factors, opens new perspectives for applied photocatalysis.

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Aloe-vera flower shaped rutile TiO2 for selective hydrogenation of nitroaromatics under direct sunlight irradiation

Cited by 10 publications

References 54 publications

Optimized V‐Doped Defective TiO₂/α‐(Fe₂O₃)_1‐x(Cr₂O₃)_x Heterojunctions for Photo‐Assisted Supercapacitor Devices: Insights on the Materials Integrity and Dual Conversion‐Storage Mechanism

Optimized V‐Doped Defective TiO₂/α‐(Fe₂O₃)_1‐x(Cr₂O₃)_x Heterojunctions for Photo‐Assisted Supercapacitor Devices: Insights on the Materials Integrity and Dual Conversion‐Storage Mechanism

Photocatalytic Materials for Reduction of Nitroarenes and Nitrates

Photocatalytic Transformation of Organics to Valuable Chemicals – Quo Vadis?

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Aloe-vera flower shaped rutile TiO2 for selective hydrogenation of nitroaromatics under direct sunlight irradiation

Cited by 10 publications

References 54 publications

Optimized V‐Doped Defective TiO2/α‐(Fe2O3)1‐x(Cr2O3)x Heterojunctions for Photo‐Assisted Supercapacitor Devices: Insights on the Materials Integrity and Dual Conversion‐Storage Mechanism

Optimized V‐Doped Defective TiO2/α‐(Fe2O3)1‐x(Cr2O3)x Heterojunctions for Photo‐Assisted Supercapacitor Devices: Insights on the Materials Integrity and Dual Conversion‐Storage Mechanism

Photocatalytic Materials for Reduction of Nitroarenes and Nitrates

Photocatalytic Transformation of Organics to Valuable Chemicals – Quo Vadis?

Contact Info

Product

Resources

About

Optimized V‐Doped Defective TiO₂/α‐(Fe₂O₃)_1‐x(Cr₂O₃)_x Heterojunctions for Photo‐Assisted Supercapacitor Devices: Insights on the Materials Integrity and Dual Conversion‐Storage Mechanism

Optimized V‐Doped Defective TiO₂/α‐(Fe₂O₃)_1‐x(Cr₂O₃)_x Heterojunctions for Photo‐Assisted Supercapacitor Devices: Insights on the Materials Integrity and Dual Conversion‐Storage Mechanism