J. P. S. Sousa

J. P. S. Sousa
International Iberian Nanotechnology Laboratory · Nanochemistry

PhD in Chemical and Biological Engineering

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12
Publications
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Publications

Publications (12)
Article
We report excellent electrocatalytic performance by AlFe 2 B 2 in the oxygen-evolution reaction (OER). The inexpensive catalytic material, prepared simply by arc-melting followed by ball-milling, exhibits high stability and sustained catalytic performance under alkaline conditions. The overpotential value of 0.24 V observed at the current density o...
Article
Textile polyacrylonitrile (PAN) fibers, which contain nitrogen, were carbonized at different temperatures and activated during 10 h in order to assess their performance as ozonation catalysts in the oxalic acid degradation The fiber carbonized at 800 °C shows the best performance due to its basic character and, mainly, the high concentration of nit...
Article
Nitrogen-doped carbon xerogels were tested as metal-free catalysts for the mineralization of oxalic acid by ozonation and by wet air oxidation. Oxalic acid was completely mineralized in less than 45 min in wet air oxidation, but complete conversion was never achieved with ozone. Some general trends were observed, and correlations between the cataly...
Article
The removal of NO by oxidation on nitrogen doped activated carbon is addressed in the present work. The activated carbons were subjected to appropriate treatments in order to modify their surface chemistry (introduction of nitrogen or oxygen containing groups). The use of carbon materials with nitrogen improves the rate of NO oxidation. Among all t...
Article
Full-text available
Carbon xerogels were prepared by the polycondensation of resorcinol and formaldehyde using three different solution pH values and the gels were carbonized at three different temperatures. Results show that it is possible to tailor the pore texture of carbon xerogels by adjusting the pH of the initial solution and the carbonization temperature. Mate...
Article
Carbon xerogels were prepared from a nitrogen-containing polymer precursor, using melamine and urea as nitrogen sources incorporated into the polymer matrix, by the sol–gel process. Materials with different contents of nitrogen were obtained and used as catalysts for NO oxidation at room temperature. The NO conversions obtained with nitrogen doped...
Article
The catalytic oxidation of NO on N-doped activated carbons provides a promising alternative for the control of emissions of this air pollutant. Materials with different contents of nitrogen were obtained from an activated carbon precursor modified by different treatments. The presence of nitrogen-containing surface groups was shown to favour the ox...
Article
Different chemical and thermal treatments (nitric acid at boiling temperature, liquid-phase urea treatment at 200°C, and gas-phase thermal treatment with nitrogen at 600°C) were applied to multiwalled carbon nanotubes (MWCNTs) in order to produce materials with different textural and chemical properties. Nitrogen adsorption isotherms, temperature p...
Article
Carbonized and activated textile acrylic fibers and melamine foams are tested as catalysts for the wet air oxidation of aniline. The use of carbon materials prepared from foams and fibers enriched with nitrogen improves the rate of aniline removal. Among all the prepared materials, a fiber carbonized at 850°C and activated during 12 h is the most e...
Article
Full-text available
The removal of textile dyes by adsorption onto carbon materials with extended mesoporosity is addressed in the present work. Two types of high surface area carbon adsorbents were prepared, namely a carbon xerogel and a templated carbon. Both materials were subsequently subjected to appropriate treatments in order to modify their surface chemistries...
Article
Full-text available
Mesoporous carbon materials prepared via SBA-15 templating and carbon xerogels were tested as catalysts for the ozonation of organic pollutants, and their performances compared to activated carbons. Kinetic results showed that only the combination of the mesoporous carbons with ozone may lead to total mineralisation. The roles of surface chemistry...

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Projects

Projects (3)
Archived project
Development of a new ecologically topcoat formula for marine application with superhydrophobic properties. Removing the harmful impact of currently used biocides in the coating.
Project
Development of a stable and efficient adsorbent (metal oxides) for the selective extraction of the Zn/Cu cations