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959 results on '"Trindade, Tito"'

27. Ionic‐Liquid‐Supported Magnetic Nanoparticles: Synthesis, Characterization, and Their Use for the Separation of Co and Ni from Li in Aqueous Solutions.

Author

Almeida, Joana C., Cardoso, Celso E. D., Neves, Márcia, Trindade, Tito, Freire, Mara G., and Pereira, Eduarda

Subjects
MAGNETIC fluids, ELECTRIC vehicle industry, MAGNETIC separation, NANOSTRUCTURED materials, AQUEOUS solutions
Abstract

The evolution of the electric vehicle market and the ongoing demand for lithium (Li), cobalt (Co) and nickel (Ni) for batteries production requires secondary sources for obtaining these elements. The recycling of Li‐ion batteries involves hydrometallurgical processes with potential environmental implications, hence there is an urgent need for sustainable and more efficient recycling methods. Functionalized colloidal magnetic nanomaterials have gained interest as sorbents as they can selectively bind and remove metal species from waters, allowing their easy recovery through magnetic separation. This work addresses the preparation and evaluation of silica‐coated magnetite nanoparticles (NPs), as alternative materials to recover Co and Ni from aqueous media, after their surface modification with 1‐methyl‐3‐propylimidazolium chloride. The magnetic nanosorbents were fully characterized and the influence of solution pH and amount of ILs on the NPs surface was evaluated. Our research allows us to conclude that IL functionalized magnetic nanoparticles can be explored as an alternative to hydrometallurgical processes for the separation of Co and Ni from alkaline lixiviates of spent lithium‐ion battery (LIB) powders. [ABSTRACT FROM AUTHOR]

Published
2024
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31. Sonochemical-assisted synthesis of CsPbBr3 perovskite quantum dots using vegetable oils.

Author

Conceição, Pedro, Perdomo, Andrés, Carvalho, Diogo F., Teixeira, Jennifer P., Salomé, Pedro M. P., and Trindade, Tito

Subjects
QUANTUM dots, PEROVSKITE, SONOCHEMICAL degradation, THIN films, MINERAL oils, VEGETABLE oils, CRYSTAL structure
Abstract

Cesium lead halide (CsPbX3) perovskite quantum dots (PQDs) have attracted attention for use as absorber materials in photovoltaics as they show tuneable bandgap energy and high photoluminescence quantum yields together with the potential to demonstrate long-term stability and simple solution processability. Currently, the colloidal synthesis of PQDs relies to a large extent on the use of toxic and fossil derived solvents as the reaction medium. Alternative methods that partially or completely replace such solvents are anticipated as a step forward in meeting the sustainability criteria for the large-scale synthesis of PQDs. Herein, we report an eco-friendly sonochemical-assisted synthesis of CsPbBr3 PQDs using commercial vegetable oil solvents as the reaction medium. The effect of different vegetable oils on the synthesis and properties of PQDs was investigated in detail. The as-prepared CsPbBr3 colloids show similar photoluminescence (PL) spectra and crystalline structure to colloids obtained in mineral oil, which was used here for comparative purposes. Furthermore, a smaller amount of the optically inactive Cs4PbBr6 hexagonal crystalline phase was detected in the green synthesis compared to mineral oil-based synthesis. Finally, spin-coated thin films were produced, demonstrating the processability of the colloidal PQDs obtained via the green synthesis described here. [ABSTRACT FROM AUTHOR]

Published
2024
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32. Surface‐Enhanced Raman Scattering Using 2D Materials.

Author

Pinto de Sousa, Beatriz, Fateixa, Sara, and Trindade, Tito

Subjects
SERS spectroscopy, METALLIC composites, SURFACE chemistry, RAMAN spectroscopy, SUBSTRATES (Materials science), SURFACES (Technology)
Abstract

The use of surface‐enhanced Raman scattering (SERS) as a technique for detecting small amounts of (bio)chemical analytes has become increasingly popular in various fields. While gold and silver nanostructures have been extensively studied as SERS substrates, the availability of other types of substrates is currently expanding the applications of this spectroscopic method. Recently, researchers have begun exploring two‐dimensional (2D) materials (e. g., graphene‐like nanostructures) as substrates for SERS analysis. These materials offer unique optical properties, a well‐defined structure, and the ability to modify their surface chemistry. As a contribution to advance this field, this concept article highlights the significance of understanding the chemical mechanism that underlies the experimental Raman spectra of chemisorbed molecules onto 2D materials' surfaces. Therefore, the article discusses recent advancements in fabricating substrates using 2D layered materials and the synergic effects of using their metallic composites for SERS applications. Additionally, it provides a new perspective on using Raman imaging in developing 2D materials as analytical platforms for Raman spectroscopy, an exciting emerging research area with significant potential. [ABSTRACT FROM AUTHOR]

Published
2024
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