A5058656935- Mesoporous Materials and Catalysis
- Polyoxometalates: Synthesis and Applications
- Metal complexes synthesis and properties
- Porphyrin and Phthalocyanine Chemistry
- Advanced Photocatalysis Techniques
- Inorganic and Organometallic Chemistry
- Electrochemical Analysis and Applications
- Nanomaterials for catalytic reactions
- Electrocatalysts for Energy Conversion
- Catalytic Processes in Materials Science
- Adsorption and biosorption for pollutant removal
- CO2 Reduction Techniques and Catalysts
- Analytical chemistry methods development
- Metal-Organic Frameworks: Synthesis and Applications
- Free Radicals and Antioxidants
- Water Quality Monitoring and Analysis
- Lanthanide and Transition Metal Complexes
- Oxidative Organic Chemistry Reactions
- Catalysis and Oxidation Reactions
- Magnetism in coordination complexes
- Advanced oxidation water treatment
- Layered Double Hydroxides Synthesis and Applications
- Adsorption, diffusion, and thermodynamic properties of materials
- Electrochemical sensors and biosensors
- TiO2 Photocatalysis and Solar Cells
University of Minho
2011-2024
Rede de Química e Tecnologia
2005-2024
Universidade do Porto
2006-2024
University of Silesia in Katowice
2016
University of Opole
2009
University of Lisbon
2005
Pedagogical University
1997
This study describes nanocomposites of graphene flakes (GF) combined with CuS, Fe3O4 and CuS−Fe3O4 nanoparticles prepared by wet chemical methods. The and/or CuS were directly anchored onto GF without requiring additional treatment. composition, structure morphology the nanocomposites, as well pristine metal oxide/sulfide characterised X − ray photoelectron spectroscopy (XPS), Raman spectroscopy, Fourier transform infrared (FTIR), powder diffraction (XRD) scanning electron microscopy (SEM)...
Ferroelectric ceramics (BaTiO3_MnO2) with different Mn admixtures were prepared using solid-state synthesis. Elemental analysis, powder X-ray diffraction, scanning electron microscopy, Fourier-transform infrared spectroscopy, and impedance spectroscopy confirmed that the BaTiO3 MnO2 coexisted in ceramics. In addition, high purity homogeneity of element distributions ceramic samples confirmed. The adsorptive photocatalytic properties (reference sample, BTO) BaTiO3_MnO2 materials (BTO_x, where...
A new application of graphene-type materials as an alternative cleanup sorbent in a quick, easy, cheap, effective, rugged, and safe (QuEChERS) procedure combined with GC–ECD/GC–MS/GC–MS/MS detection was successfully used for the simultaneous analysis 12 brominated flame retardants Capsicum cultivar samples. The chemical, structural, morphological properties were evaluated. exhibited good adsorption capability matrix interferents without compromising extraction efficiency target analytes when...
A Mn(III) salen complex was immobilized onto the Laponite surface using three different methodologies: method A, direct immobilization of on parent Laponite; B, covalent anchoring through cyanuric chloride (CC); and C, CC into a 3-aminopropyl)triethoxysilane (APTES) modified Laponite. All materials were characterized by FTIR, XPS, thermogravimetry, XRD, nitrogen isotherms at 77 K, to gather information modifications introduced organo spacers within surface, as well anchored integrity; Mn...
TiO2-containing photocatalysts, which combine TiO2 with carbon-based materials, are promising materials for wastewater treatment due to synergistic photodegradation and adsorption phenomena. In this work, TiO2/AC composites were produced by the in situ immobilization of nanoparticles over activated carbon (AC) derived from spent coffee grains, using different proportions. The tested as adsorbents (dark) photocatalysts a combined adsorption+photocatalytic process (solar irradiation) methylene...
Binuclear catalytic sites attained in a controlled way with complementary and cooperative metal ion centers are highly relevant the development of new or enhanced processes. Herein, binuclear carrying Fe(III), Cu(II), Mn(III) ions polarized structure have been prepared using ionic self-assembly oppositely charged metalloporphyrins. Binary porphyrin structures (BIPOS) based on metalloporphyrin cations pyridinium methylpyridinium groups conjugation anions sulfonatophenyl groups. BIPOS...
The manganese(III) complex—carboxylate-[N,N′-bis(salicylaldehyde)cyclohexanediaminate]manganese(III), [Mn(salhd)CH3COO]—was encapsulated into an aluminium pillared clay (denoted as Al-WYO) using a two-step liquid phase methodology: (i) adsorption of manganese(II) acetate in ethanolic solution within Al-WYO, followed by (ii) diffusion N,N′-bis(salicylaldehyde)cyclohexanediamine solution. new material was characterised several techniques (ICP-AES, XPS, FTIR, UV–Vis and low temperature nitrogen...
An encapsulated Mn(III)– salen complex in NaY was synthesized and characterized, the catalytic behaviour of evaluated by oxidation styrene. The encapsulation achieved two different methodologies designated as flexible ligand method (A) situ synthesis (B). characterizations free well catalysts with without were performed powder X‐ray diffraction, scanning electron microscopy, chemical analysis FT‐IR spectroscopy. Both prepared are active styrene presence tert ‐butyl hydroperoxide ( t BuOOH)...
We have determined the composition of rock art pigments from two megalithic barrows located in north Portugal. The use XRD, SEM–EDS and FT–IR spectroscopy confirmed presence hematite kaolinite red Eireira barrow, white pigment Leira das Mamas barrow. organic was studied by GC–MS, suggesting that sinuous lines dots barrow were prepared with cooked or heated algae and/or aquatic plants, egg as binder, while revealed a mixture vegetable oils for moulding, which could be stabilized temporary...
Abstract Herein, S‐doped graphene flakes‐based composites with Fe 3 O 4 and/or CuS nanoparticles (NPs) are reported as photo‐Fenton catalysts for the 4‐nitrophenol (4‐NP) degradation. The flakes (S‐GF) were prepared using a thermal treatment approach, and nanocomposites by in situ growth of onto S‐GF scaffold. characterization methods confirmed formation two‐ three‐components nanocomposites. NPs presented cubic inverse spinel structure phases covellite structure, both smaller crystallite...
Successful electrochemical oxidation of diclofenac, a non-steroidal anti-inflammatory drug considered as an emerging pollutant, was investigated on CNT, Pt/CNT and Ru/CNT modified electrodes based Carbon Toray in aqueous media.
Unlike municipal solid waste bottom ash (MSWBA), fly (MSWFA) is landfilled due to its toxicity. However, MSWFA may also be a source of elements. Ash samples collected from Portuguese MSW incinerator different locations and over six months were analyzed. Their geochemical composition was normalized the upper continental crust (UCC) compared since metal enrichment used as an indicator for potential recovery. The recovery economic viability assessed metals K, Sb, Cu, Pb, Zn, considering ore...
Abstract The oxidation of phenol, cychohexanol and hydroquinone has been screened in the presence copper(II) complexes with Schiff‐base salen ligand, 1,5‐bis[( E )‐5‐chloro‐2‐hydroxybenzylideneamino]‐1 H ‐imidazole‐4‐carbonitrile, encapsulated into NaY zeolite by using two different methods. new heterogeneous catalysts were characterized SEM, XRD, FTIR, EPR Raman spectroscopy as well chemical analysis. structures proposed on basis theoretical studies (DFT). catalytic activities compared...