Publications by authors named "Rafael Canevesi"
Article Synopsis
- Upgrading biogas to biomethane is important for utilizing renewable fuels from biomass waste, and this study investigates the efficiency of coconut-shell activated carbon (CAC 8X30) for this process through Pressure Swing Adsorption (PSA).
- The research involved characterizing the adsorbent and estimating adsorption parameters for methane (CH), carbon monoxide (CO), and water (HO), comparing CAC 8X30 with zeolite 13X under different conditions.
- Results showed CAC 8X30 had significant micropore volume and demonstrated better selectivity for CO over CH in humid conditions, suggesting a potential combined use with zeolite 13X for effective biogas upgrading.
Article Synopsis
- * The study contrasts the effects of nitrogen functionalities against textural properties in four types of activated carbons to determine their influence on ORR activity.
- * Results indicate that N-doping plays a more critical role than textural properties in these carbon materials, contributing to ongoing discussions in the carbon research community.
The main goal of this study was to assess alternatives to the current challenges on environmental quality and circular economy. The former is here addressed by the treatment of radioactively contaminated solutions, and the latter by using abundant and low-cost biomass. In this paper, we examine the biosorption of hexavalent uranium (U(VI)) in a batch system using the macrophytes Limnobium laevigatum and Azolla sp.
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- Understanding the textural properties of hierarchical porous carbons (HPCs) is crucial for choosing the right materials for various applications and comprehending their behavior in systems.
- Gas adsorption-desorption isotherms and density functional theory (DFT) models are commonly used for this characterization, but fixed pore shape boundaries can lead to inaccuracies in pore size distributions (PSDs).
- A new dual-shape DFT model allows for simultaneous analysis of nitrogen and carbon monoxide adsorption data, improving accuracy by adjusting pore shape boundaries, thus reducing artifacts in PSDs.
Article Synopsis
- A silicon-based microanalytical prototype effectively detected volatile organic compounds (VOCs) in indoor air at extremely low concentrations (ppb levels).
- The study utilized novel materials, including a tannin-derived carbon, a MIL-101(Cr) MOF, and a DaY zeolite, to enhance the preconcentration of BTEX compounds such as benzene and toluene.
- The DM2C adsorbent showed outstanding performance with high stability and repeatability over four months and 500 tests, enabling quick and reliable detection of VOCs, even in humid conditions.
Article Synopsis
- - Hyper-crosslinked polymers (HCPs) were created using a Friedel-Crafts reaction with various precursors, and the impact of adding graphene oxide (GO) was investigated, resulting in highly microporous materials with BET surface areas between 590 and 1120 mg.
- - The HCP derived from benzene (B1FeM2) and its composite with GO (B1FM2-GO) had the highest surface areas, and their hydrogen adsorption capacities were tested at low temperatures, showing maximum hydrogen uptake of 2.1 wt% and 2.0 wt%, respectively, at a pressure of 4 MPa.
- - Despite the GO addition improving the density of the composite materials, it
Article Synopsis
- - The study investigates the effectiveness of activated carbons (ACs) for hydrogen storage, finding that six commercial ACs showed hydrogen adsorption capacities between 2.3 to 5.8 wt % under specific conditions (77 K and 4 MPa).
- - It highlights that hydrogen adsorption capacity is better predicted by surface areas calculated through nonlocal density functional theory rather than the traditional Brunauer-Emmett-Teller (BET) method.
- - The research uses the modified Dubinin-Astakhov (MDA) equation to analyze experimental data and establishes new correlations between MDA parameters and the textural properties of ACs, aiding in the evaluation of the best carbon materials for hydrogen storage.
Calcium alginate beads, inactivated Saccharomyces cerevisiae and inactivated S. cerevisiae immobilized in calcium alginate beads (S. cerevisiae-calcium alginate beads) are examined as potential biosorption materials as regards their capacity to remove Am.
View Article and Find Full Text PDFRice and coffee husks (raw and chemically activated) are examined as potential biosorption materials regarding their capacity to remove U (total), Am, and Cs. The physical parameters evaluated were the morphological characteristics of the biomass, real and apparent density, and surface area. Contact times for the batch experiments were 0.
View Article and Find Full Text PDFBiosorption-based technologies have been proposed for the removal of radionuclides from radioactive liquid waste containing organic compounds. Nevertheless, pytoremediation potential of uranium (U) by nonliving aquatic macrophytes Lemna sp. and Pistia stratiotes has not been previously addressed.
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