Papers by Eliana Da Silva
International Journal of Molecular Sciences
Bacterial resistance to antibiotics is a critical global health issue and the development of alte... more Bacterial resistance to antibiotics is a critical global health issue and the development of alternatives to conventional antibiotics is of the upmost relevance. Antimicrobial photodynamic therapy (aPDT) is considered a promising and innovative approach for the photoinactivation of microorganisms, particularly in cases where traditional antibiotics may be less effective due to resistance or other limitations. In this study, two β-modified monocharged porphyrin-imidazolium derivatives were efficiently incorporated into polyvinylpyrrolidone (PVP) formulations and supported into graphitic carbon nitride materials. Both porphyrin-imidazolium derivatives displayed remarkable photostability and the ability to generate cytotoxic singlet oxygen. These properties, which have an important impact on achieving an efficient photodynamic effect, were not compromised after incorporation/immobilization. The prepared PVP-porphyrin formulations and the graphitic carbon nitride-based materials display...
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Journal of Photochemistry and Photobiology A-chemistry, Aug 1, 2013
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Tese de doutoramento em Quimica apresentada a Faculdade de Ciencias e Tecnologia da Universidade ... more Tese de doutoramento em Quimica apresentada a Faculdade de Ciencias e Tecnologia da Universidade de Coimbra.
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Acta Oceanologica Sinica, 2010
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Sustainable energy & fuels, 2024
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International Journal of Hydrogen Energy
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Journal of Energy Chemistry, 2022
Abstract The high energy demand we currently face in society and the subsequent large consumption... more Abstract The high energy demand we currently face in society and the subsequent large consumption of fossil fuels cause its depletion and increase the pollution levels. The quest for the production of clean energy from renewable and sustainable sources remains open. The conversion of solar energy into hydrogen via the water-splitting process, assisted by photoresponsive semiconductor catalysts, is one of the most promising technologies. Significant progress has been made on water splitting in the past few years and a variety of photocatalysts active not only under ultra-violet (UV) light but especially with the visible part of the electromagnetic spectrum have been developed. Layered double hydroxides (LDH)-based materials have emerged as a promising class of nanomaterials for solar energy applications owing to their unique layered structure, compositional flexibility, tunable bandgaps, ease of synthesis and low manufacturing costs. This review covers the most recent research dedicated to LDH materials for photocatalytic water-splitting applications and encompasses a range of synthetic strategies and post-modifications used to enhance their performance. Moreover, we provide a thorough discussion of the experimental conditions crucial to obtaining improved photoactivity and highlight the impact of some specific parameters, namely, catalysts loading, cocatalysts, sacrificial agents, and irradiation sources. This review provides the necessary tools to select the election technique for adequately enhancing the photoactivity of LDH and modified LDH-based materials and concludes with a critical summary that outlines further research directions.
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Materials Science in Semiconductor Processing, 2020
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Environmental Pollution, 2020
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Catalysis Today, 2019
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ChemSusChem, Jan 5, 2018
A green, template-free easy-to-implement strategy giving access to holey g-C₃N₄ nanosheets doped ... more A green, template-free easy-to-implement strategy giving access to holey g-C₃N₄ nanosheets doped with carbon is described. The protocol involves heating dicyandiamide with β-cyclodextrin (βCD) prior to polymerization. By this approach, the local symmetry of g-C3N4 skeleton is broken, thus yielding CxGCN (x corresponds to the initial amount of βCD used) with porous and a distorted structure. The electronic, emission, optical and textural properties of the best-performing material, C2GCN, are thus greatly modified as compared to bulk g-C₃N₄ (GCN). The spectroscopic and luminescent features of C2GCN show the characteristic π-π* electronic transition of GCN, accompanied by much stronger n-π* electronic transitions due to the porous and defect network. These new electronic transitions, along with the presence of additional carbon synergistically contribute to enhance visible light absorption and to restrain the recombination of electron-hole pairs. Steady-state and time-resolved photolum...
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Applied Catalysis B: Environmental, 2018
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Journal of Colloid and Interface Science, 2020
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ChemSusChem, 2018
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Journal of Photochemistry and Photobiology A: Chemistry, 2017
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Photochemical & Photobiological Sciences, 2004
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Environmental science and pollution research international, May 17, 2014
Decatungstate W10O32(4-) was efficiently intercalated between the layers of three-dimensionally o... more Decatungstate W10O32(4-) was efficiently intercalated between the layers of three-dimensionally ordered macroporous Mg2Al-layered double hydroxide. The structural and textural properties of as-prepared intercalated compound were characterized using different solid-state characterization techniques such as X-ray powder diffraction, FTIR and Raman spectroscopies and electronic microscopy. The photocatalytic properties of immobilized W10O32 (4-) within Mg2Al structure were investigated using 2-(1-naphthyl) acetamide (NAD) as a model of pesticide. The influence of different parameters such as amount of catalyst, pH and oxygen concentration were investigated. An optimal NAD degradation was obtained for a photocatalyst concentration of 60 mg l(-1). Under our experimental conditions, this heterogeneous photocatalyst induces photodegradation of 60 % of NAD after 17 h of irradiation at 365 nm and at pH 6.6. Interestingly, pesticide photodegradation leads to the mineralization of substrates to H2O and CO2 and the photocatalyst can be recycled and reused without any loss of activity over four cycles.
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Photochemistry and Photobiology, 2013
The photochemical degradation of 2-(1-naphthyl) acetamide (NAD) in aqueous solution using simulat... more The photochemical degradation of 2-(1-naphthyl) acetamide (NAD) in aqueous solution using simulated sunlight excitation as well as UV light within the 254-300 nm range was investigated to obtain an insight into the transformation mechanism that could occur under environmental conditions. Several photoproducts were identified using HPLC/MS/MS techniques. The degradation quantum yield was found to be independent of the excitation wavelength, but showed a dependence of oxygen concentration. This increased by a factor of approximately 3 from aerated to oxygen-free solutions. There is a clear involvement of both triplet and singlet excited states in NAD photoreactivity. The participation of singlet oxygen as a significant route in NAD degradation was ruled out by comparison with the behavior using Rose Bengal as a photosensitizer. A mechanistic pathway implying hydroxylation process through NAD radical cation species as well as an oxidation reaction by molecular oxygen is proposed. The photochemical behavior of NAD appears to mainly involve the aromatic moieties without any participation of the amide side chain. Toxicity tests clearly show that the generated primary photoproducts are responsible for a significant increase in the toxicity. However, upon prolonged irradiation this toxicity tends to decrease.
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Journal of Photochemistry and Photobiology A: Chemistry, 2013
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Papers by Eliana Da Silva