A5065162748- Marine and coastal ecosystems
- Isotope Analysis in Ecology
- Marine Biology and Ecology Research
- Advanced Photocatalysis Techniques
- Water Quality Monitoring and Analysis
- TiO2 Photocatalysis and Solar Cells
- Marine and environmental studies
- Chemical and Physical Properties in Aqueous Solutions
- Chemical Reaction Mechanisms
- Crystallization and Solubility Studies
- Mercury impact and mitigation studies
- Adsorption and biosorption for pollutant removal
- Luminescence Properties of Advanced Materials
- Chemical Synthesis and Reactions
- X-ray Diffraction in Crystallography
- Atmospheric chemistry and aerosols
- Organometallic Compounds Synthesis and Characterization
- Enzyme-mediated dye degradation
- Coal and Its By-products
- Phosphorus and nutrient management
- Clay minerals and soil interactions
- Advanced oxidation water treatment
- Selenium in Biological Systems
- Aquatic Ecosystems and Phytoplankton Dynamics
- Catalytic Alkyne Reactions
Universidad de La Laguna
2016-2018
Agencia Estatal de Meteorología
2014
Universidade Federal de Santa Catarina
1998-2013
Universidad de Huelva
2012
Université de Bordeaux
1990-2000
Centre National de la Recherche Scientifique
1997-2000
Studies on elemental analysis, Fourier transform infrared spectroscopy (FT-IR) and thermal decomposition (thermogravimetry, TG; derivative thermogravimetry, DTG) of sedimentary fulvic (FA) humic acids (HA) from marine, estuarine, lacustrine terrestrial environments are presented. In general, H/C N/C atomic ratios, as well the spectra, reflected extent influence algal and/or organic matter sources samples, aquatic (both, marine freshwater) substances (HS) being richer in nitrogen more...
The acid decomposition of some substituted methyldithiocarbamates was studied in water at 25 °C the range Ho −5 and pH 5. pH−rate profiles showed a bell-shaped curve from which were calculated dissociation constants free conjugate species specific catalysis rate kH. Brønsted plot kH vs pKN, constant parent amine, suggests that cleavage occurs through two mechanisms depend on pKN. presents convex upward with maximum pKN 9.2, is consistent dithiocarbamate anion zwitterion intermediate...
Different g-C3N4 composite systems (coke carbon/g-C3N4, Bi/Bi2WO6/g-C3N4 and Bi/Bi2MoO6/g-C3N4) have been assessed as photocatalysts for wastewater pollutants removal. The coke carbon/g-C3N4 hybrid, produced by thermal treatment at 550 °C of a made from melamine cyanurate coke, only showed activity under UV-light irradiation. On the other hand, inorganic Bi spheres/Bi mixed oxides/g-C3N4 nanohybrids (Bi/Bi2WO6/g-C3N4 Bi/Bi2MoO6/g-C3N4 composites), reduction Bi2WO6 or Bi2MoO6 g-C3N4,...
The use of the bulky hydrotris(3-mesitylpyrazolyl)borate anionic ligand has allowed synthesis stable TpMsCu(alkyne) complexes (alkyne = 1-hexyne, 1, phenylacetylene, 2, and ethyl propiolate, 3). spectroscopic structural features these compounds their relative reactivity have been examined, indicating existence a low π back-bonding from copper(I) centre to alkyne. Ligand exchange experiments shown that terminal alkyne adducts are more than internal analogues. In good accordance with this,...
Six estuarine fulvic (FA) and humic acids (HA) were fractionated with reversed-phase high performance liquid chromatography in a water/acetonitrile gradient, fluorescence detection. Differences between FA HA chromatograms pointed to higher incidence of hydrophobic components the latter. Excitation-emission matrix diagrams most fractions similar those bulk samples indicating that, spite their distinct polarities, complexity main spectral characteristics materials persisted. A primary group...
The acid decomposition of ethylenebis(dithiocarbamate) (EbisDTC) and glycinedithiocarboxylate (glyDTC) was studied in water at 25 degrees C the range H(o) -5 to pH 5. dissociation constants all species involved were calculated from LFER pH-rate profiles. According pK(a) parent amine reactive species, both compounds decompose through dithiocarbamate anion a zwitterion intermediate. intermolecular N-protonation rate constant carboxylic conjugate glyDTC is 12.6 M(-)(1) s(-)(1), slower than C-N...
ABSTRACT Peat is a mixture of compounds formed by the decomposition plant residues and mineral materials that have accumulated at bottom ponds flooded depressions in riverine areas. Due to their extreme heterogeneity natural variety, physical chemical properties peat can vary widely within or between deposits, characterization isolated samples still challenging task requires combination several spectroscopic methodologies. In this study, structural characteristics two Brazilian were...
In this work, we propose an alternative and fully experimental procedure based only on external quantum efficiency (EQE) measurements for characterizing the transmittance of downshifters placed photovoltaic (PV) devices. The setup requires two PV devices as references, one them showing a zero EQE in downshifting spectral range. Therefore, results obtained are independent device, easing analysis comparison between results. Also, method avoids complex theoretical modeling proposed other works....
Abstract The purpose of this work was to evaluate the performance ozonation as a technique treat textile effluents. This evaluation made using physico-chemical parameters and phytotoxic endpoints (i.e. biomass growth enzyme activities – catalase peroxidase). After ozonation, color absorbance (523 nm) reduced by 80.9 % pH decreased from 10.9 approximately 7.5 while COD reduction reached nearly 87 %. Phytotoxicity tests carried out in solution with three plant species soybean, rice wheat)...
BY VOLTAMMETRY.This work describes the construction of a home-made low-cost reactor, using easily available materials, capable destroying efficiently dissolved organic matter.Just 30 minutes irradiation were sufficient to destroy more than 99% humic acids present in solution 4 mg C L -1 .Copper speciation was evaluated natural waters different salinities test reactor's efficiency organically complexed metal species.The effect matter concentration, salinity, oxygen and temperature...
Structural and spectroscopic properties of sedimentary estuarine humic compounds (HC) surrounding pore waters were investigated. Elemental analysis showed that HC exhibit a molecular design compatible with mixed continental-marine environment. In some respects, they are well correlated the marine organic matter (e.g. low C/H ratio), while in others better associated to terrestrial material high C/N ratio). High rates microbiological activity, combined tide-dependent contribution an aliphatic...