A5034332602- Carbon and Quantum Dots Applications
- Analytical chemistry methods development
- Nanocluster Synthesis and Applications
- Advanced biosensing and bioanalysis techniques
- Pesticide Residue Analysis and Safety
- Catalysis and Hydrodesulfurization Studies
- Molecular Sensors and Ion Detection
- Electrochemical Analysis and Applications
- Analytical Methods in Pharmaceuticals
- Catalytic Processes in Materials Science
- Electrochemical sensors and biosensors
- Biosensors and Analytical Detection
- Mercury impact and mitigation studies
- Bioactive Compounds and Antitumor Agents
- Antibiotics Pharmacokinetics and Efficacy
- Graphene and Nanomaterials Applications
- Luminescence and Fluorescent Materials
- Fiber-reinforced polymer composites
- Analytical Chemistry and Sensors
- Effects and risks of endocrine disrupting chemicals
- Hydrogels: synthesis, properties, applications
- Mass Spectrometry Techniques and Applications
- Advanced Nanomaterials in Catalysis
- Phytochemical compounds biological activities
- Supramolecular Self-Assembly in Materials
University of the Coast
2019-2025
Pontifical Catholic University of Rio de Janeiro
2016-2023
University of Atlántico
2018-2020
For the synthesis of polymeric resins, it is great importance to review raw materials and equipment be used avoid presence compounds that may affect effectiveness polymerization characteristics plastic obtained. Iron oxide a compound can present in reactors after maintenance due techniques cleaning this equipment, reducing their quality. In study, FeO different concentrations was evaluated determine its effects on properties pyrolysis polypropylene resins by using X-ray refraction elements...
During the production of polymer-grade propylene, different processes are used to purify this compound and ensure that it is highest quality. However, some impurities such as acetylene methyl difficult remove, these may be present in propylene obtain polypropylene, which have repercussions on process. This study evaluates impact productivity polypropylene synthesis process mechanical thermal properties material obtained through eight samples with concentrations acetylene. We discovered for...
Trace elements play an important role in humans as some are essential for the proper functioning of body while others may have negative impact health. Inductively coupled plasma mass spectrometry (ICP-MS) has been used determination nine (Cd, Cr, Cu, Fe, Mn, Ni, Ti, V e Zn) olive oil, soy oil and margarine. Samples were treated with nitric acid solution (10 % v/v) heated at 50 °C 30 min. This mixture was placed ultrasonic bath 20 min, order to obtain quantitative extraction trace-elements...
Background: Mercury (Hg) is a highly neurotoxic pollutant present in different environmental matrices. Herein, simple and sensitive assay proposed for Hg detection water samples employing polyethylene glycol monododecyl ether (PGME) stabilized silver nanoparticles (PGME-AgNPs). Methods: The prepared PGME-AgNPs were characterized by absorption, scanning electron microscopy (SEM), atomic force (AFM), dynamic light scattering (DLS), Zeta potential measurements. addition of Hg(II) to an aqueous...
The method developed for the determination of lapachone isomers ( α ‐ and β ‐lapachones) involves use square wave voltammetry (SWV) with an electrode based on epoxy–graphite composite. electrolytic aqueous solution contained a cationic surfactant (CTAB), phosphate buffer (pH 6.0), KNO 3 . addition CTAB enhanced analyte diffusion into electrode–solution interface, improving detection through SWV. Under chosen conditions, ‐lapachone respectively present reversible quasireversible processes....
Heavy metal contamination of water is a critical environmental problem due to its toxicity and persistence in ecosystems. In this study, magnetic hydrogel spheres composed carboxymethylated starch modified with poly(1-vinylimidazole) (CMS-g-PVI) polyvinyl alcohol (PVA), combined Fe3O4 nanoparticles, were synthesized characterized evaluate their efficiency adsorbing ions such as Cu2+, Pb2+, Cd2+. Structural characterization by FT-IR spectroscopy confirmed the successful integration all...
Sensors for the detection of heavy metal ions in water are high demand due to danger they pose both environment and human health. Among their possible approaches, modulation photoluminescence gold nanoclusters (AuNCs) is gaining wide interest as an alternative classical analytical methods based on complex high-cost instrumentation. In present work, luminescent oxidized AuNCs emitting ultraviolet (UV) visible (blue) regions were synthesized by pulsed laser ablation a target NaOH aqueous...
The effects of the synthesis method, dopant nature, and porosity on dibenzothiophene hydrodesulfurization performance hierarchically porous NiMoS(Si,Zr)/Al2O3 catalysts were studied. Si Zr incorporation was carried out using grafting (G) sol–gel (SG) methods. characterized scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), N2 physisorption, Hg intrusion porosimetry (MIP), diffraction, hydrogen temperature-programmed reduction (H2-TPR), pyridine-adsorbed Fourier...
Thiomersal is an organomercurial compound but, despite that, it widely used in vaccines formulations to inactivate organisms and toxins prevent microbial growth during storage use. In this work, thiomersal (along with traces of mercurial residues) was determined after photo-degradation (using UV H2O2) produce Hg2+ that by flow injection analysis using luminescence probing carbon quantum dots (prepared from citric acid thiourea). Linear analytical response observed the concentration range 25...
Mercury speciation analysis in produced water (PW) was achieved by optical multipath cold vapor atomic absorption spectrometry. One sample aliquot treated with SnCl2, producing Hg0 that carried out to the detection cell be determined. Another exposed UV, promoting oxidation of CH3Hg+ Hg2+, and then determined after chemical reduction SnCl2. The content difference results for both aliquots. Matrix effects imposed oil salt were studied although intensity mercury time profile affected,...
Graphene quantum dots (GQDs) have been of high interest due to their size and optical characteristics, which improves when functional groups are added borders defects. In this work, the in vitro toxicity aqueous dispersion GQDs (w/wo amino-functionalization) was investigated two different cellular models (S. cerevisiae H9c2 cell line). Results yeast suggest that at up 25 % volume concentration, effect all tested only inhibitory, and, both models, toxic is rigorously dose-dependent. The...