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Publicaciones 20242024-01-07T11:26:55+01:00

Publicaciones (2024)

Publicaciones clasificadas por fecha en orden descendente

Direct in-situ insights into the asymmetric surface reconstruction of rutile TiO2 (110)

Autores: Wentao Yuan, Bingwei Chen, Zhong-Kang Han, Ruiyang You, Ying Jiang, Rui Qi, Guanxing Li, Hanglong Wu, Maria Veronica Ganduglia-Pirovano & Yong Wang

Nature Communications. volume 15, Article
Fecha: 2024
Doi: 10.1038/s41467-024-46011-6

Resumen:
The reconstruction of rutile TiO2 (110) holds significant importance as it profoundly influences the surface chemistry and catalytic properties of this widely used material in various applications, from photocatalysis to solar energy conversion. Here, we directly observe the asymmetric surface reconstruction of rutile TiO2 (110)-(1×2) with atomic-resolution using in situ spherical aberration-corrected scanning transmission electron microscopy. Density functional theory calculations were employed to complement the experimental observations. Our findings [read more]

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CdS/g-C3N4/Sm-BDC MOF nanocomposite modified glassy carbon electrodes as a highly sensitive electrochemical sensor for malathion

Autores: Yassin J.M.; Taddesse A.M.; Tsegaye A.A.; Sánchez-Sánchez M.

Applied Surface Science vol: 648
Fecha: 2024
Doi: 10.1016/j.apsusc.2023.158973.

Resumen:
Malathion is an organophosphate pesticide widely used in agriculture, whose elimination is highly demanded by society. This work faces this challenge by the development of a novel electrochemical sensor via modifying a glassy carbon electrode (GCE) with sustainable Sm-BDC MOFs and their corresponding novel binary and ternary composites combined with CdS and g-C3N4 for the detection of malathion. Different characterization techniques indicate the successful synthesis of desired composite materials, with notable interaction between the individual components. CdS-Sm-BDC-g-C3N4-5 wt% modified electrode exhibited higher peak current than [read more]

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On the surface area per volumetric loading: Its pronounced improvement in densely-packed SWCNT by double-function purification

Autores: Melián-Cabrera I.; Mercadal J.J.; Mayoral A.; Fierro J.L.G.

Microporous and Mesoporous Materials, vol: 366
Fecha: 15 February 2024, 112940
Doi: 10.1016/j.micromeso.2023.112940.

Resumen:
Volumetric loading is often a critical parameter in process design rather than weight. In this work, we have assessed the volumetric textural parameters of purified single-walled carbon nanotube materials (SWCNT). Purification is a necessary step in the SWCNT manufacturing process as they contain a metal residue inherent to their synthesis. Nitric acid treatment was applied for both metal removal and carbon structural/textural modification. Results show that the volumetric BET area is enhanced in ca. 500% with respect to the non-purified SWCNT [read more]

5-Methoxymethyl furfural production by acid heterogeneous catalytic etherification of 5-hydroxymethyl furfural

Autores: Díaz-Maizkurrena P.; Requies J.M.; Iriondo A.; Arias P.L.; Mariscal R.

Catalysis Today vol: 426
Fecha: 2024
Doi: 10.1016/j.cattod.2023.114374.

Resumen:
The use of non-edible raw materials from agriculture as a form of biomass to obtain carbon-based compounds is the most viable solution to replace fossil resources. Within this, 5-hydroxymethyl furfural (HMF) is a platform monomer from which other high value-added monomers are obtained, such as 2,5-furandicarboxylic acid (FDCA), a compound that can be obtained from 5-methoxymethyl furfural (MMF), and which can be used as a fuel, fuel additive or polymer precursor. Several catalysts (mostly zeolites) have been tested to produce MMF. Specifically, with a [read more]

Natural zeolite supported g-C3N4/ZnO/Ag3PO4 composite: A tandem n-n heterojunction for simultaneous photodegradation of dyes under visible and solar irradiation

Autores: Bezu Z.; Taddesse A.M.; Diaz I.

Journal of Photochemistry and Photobiology A: Chemistry vol: 449
Fecha: 2024
Doi: 10.1016/j.jphotochem.2023.115369.

Resumen:
Various zinc-based ternary composite photocatalysts with variable weight percent ratios of g-C3N4:ZnO/Ag3PO4 in pristine and natural zeolite supported form were prepared using precipitation and solid-state methods, respectively. X-ray diffraction (XRD), Brunauer, Emmett, and Teller (BET), Scanning Electron Microscopy-Energy Dispersive X-ray Spectroscopy (SEM-EDX), Thermogravimetric analysis (TGA/DTA), Fourier Transform Infrared (FTIR), Ultraviolet–Visible Diffuse Reflectance (UV–Vis DRS), and Photoluminescence (PL) techniques were used to investigate the as-produced composites. The photocatalytic efficacy of the developed materials was studied considering methyl orange dye (MeO) and laboratory-prepared mixed dyes [read more]

An intuitive approach for spike removal in Raman spectra based on peaks’ prominence and width

Autores: Coca-Lopez N.

Analytica Chimica Acta vol: 1295
Fecha: 2024
Doi: 10.1016/j.aca.2024.342312.

Resumen:
Background: Raman spectroscopists are familiar with the challenge of dealing with spikes caused by cosmic rays. These artifacts may lead to errors in subsequent data processing steps, such as for example calibration, normalization or spectral search. Spike removal is therefore a fundamental step in Raman spectral data pre-treatment, but access to publicly accessible code for spike removal tools is limited, and their performance for spectra correction often unknown. Therefore, there is a need for development and testing open-source and easy-to-implement algorithms that improve the Raman data processing workflow. Results: In this [read more]

Improvement of the rate capability of the Li4Ti5O12 anode material by modification of the surface composition with lithium polysulfide

Autores: Cáceres-Murillo J.; Díaz-Carrasco P.; Kuhn A.; Rodríguez-Castellón E.; García-Alvarado F.

Journal of Alloys and Compounds vol: 976
Fecha: 1 March, 2024
Doi: 10.1016/j.jallcom.2023.173051.

Resumen:
Partial substitution of oxygen by sulfur was attempted using a Li/Ti rich conditions for the nominal compositions Li4Ti5O12−xSx x = 0.125–0.375. However, a much lower sulfur substitution, i.e. at dopant level, was achieved as deduced from an almost negligible increase in unit cell size observed from X-ray powder diffraction. The sulfur in the samples is mainly deposited on the surface as sulfate and Li2S2 as deduced from XPS. However, most of the nominal sulfur is lost. Interestingly, for nominal [read more]

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Atacamite (Cu2Cl(OH)3) as catalyst of different AOPs for water disinfection

Autors: Haro D.; García-Muñoz P.; Mola M.; Fresno F.; Rodríguez-Chueca J.

Catalysis Today vol:
Fecha: 2024
Doi: 10.1016/j.cattod.2023.114496.

Resumen:
Atacamite (Cu2Cl(OH)3) is a natural mineral normally used as a pigment, but this study explores its photocatalytic activity in order to be used for water treatment applications, specifically, the removal of Enterococcus faecalis for reclamation of wastewater. The research demonstrates that the system atacamite/solar radiation yields efficient bacterial inactivation (total inactivation in 90 min with 100 mg/L of atacamite). The addition of oxidants such as peroxymonosulfate (PMS), persulfate (PS), and hydrogen peroxide (H2O2), to the system allowed for an increase in the kinetic of the [read more]

Green-Mediated Synthesis of Co3O4 Nanostructures for Efficient Oxygen Evolution Reaction and Supercapacitor Applications

Autores: Bhatti A.L.; Tahira A.; Halepoto I.A.; Kumar S.; Ujjan Z.A.; Nafady A.; Shama N.A.; Dawi E.; Ashames A.; Saleem L.; Tonezzer M.; Infantes-Molin A.; Ibupoto Z.H.

Journal of Electronic Materials vol: 53
Fecha: 2024
Doi: 10.1007/s11664-023-10846-4.

Resumen:
A simple, scalable, and environmentally friendly process was demonstrated for the synthesis of Co3O4 nanostructures using lemon juice and hydrothermal chemistry. The reducing, capping, and stabilizing agents in lemon juice result in improved performance in oxygen evolution reactions and supercapacitors due to their positive effects on morphology, crystal size, and surface defects. Several techniques were used to characterize Co3O4 nanostructures grown with different quantities of lemon [read more]

Solar-assisted oxidation of organochlorine pesticides in groundwater using persulfate and ferrioxalate

Autores: Conte L.O.; Cotillas S.; Lorenzo D.; Bahamonde A.; Santos A.

Environmental Pollution vol: 343
Fecha: 15 February 2024, 123205
Doi: 10.1016/j.envpol.2023.123205.

Resumen:
The oxidation of hexachlorocyclohexane isomers in the aqueous phase (Milli-Q and groundwater) was studied using persulfate activated by ferrioxalate and solar light at circumneutral pH. The experiments were conducted in a solar simulator reactor with local radiation fluxes qw= 1.12·10−7 E cm−2s−1 and in compound parabolic collectors with solar light (qw≈10−7 E cm−2s−1) for 390 min. The effect of activator dosage (18–125 μM ferrioxalate) and persulfate concentration (520–2600 μM) on hexachlorocyclohexane conversion and oxalate and oxidant consumption was analyzed. Conversion of [read more]

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Exploring Thermomyces lanuginosus Lipase (TLL)-PdNPs Nanohybrid as Suitable Catalyst for One-pot Synthesis of Bis(3-indolyl)phenylmethane

Autors: Santos A.S.; Losada-Garcia N.; Garcia-Sanz C.; Silva A.M.S.; Marques M.M.B.; Palomo J.M.

ChemCatChem vol: 16
Fecha: 2024
Doi: 10.1002/cctc.202300748.

Resumen:
Palladium nanohybrids were synthesized and applied to the one-pot synthesis of bis(3-indolyl)methanes by selective C−C bond reaction from benzyl alcohol and indole. A T. lanuginosus lipase-palladium nanoparticles hybrid (Pd@TLL) was synthesized, yielding PdNPs with an average diameter size of 5 nm. This heterogeneous catalyst was first tested in the selective oxidation of benzyl alcohol to benzaldehyde in different solvents. Then, the direct formation of bis(3-indolyl)methane, by in situ oxidation and C−C coupling, was successfully evaluated under different conditions, obtaining >99 % conversion at [read more]

Transient photocatalytic oxidation of toluene vapor via nanostructured layers prepared by sol-gel on anatase particles

Autores: Soria J.; Sanz J.; Sobrados I.; Fresno F.; Yurdakal S.; Augugliaro V.

Journal of Environmental Chemical Engineering vol: 12
Fecha: 2024
Doi: 10.1016/j.jece.2023.111635.

Resumen:
Gas-phase photocatalytic degradation of toluene mixed with wet oxygen was performed in a continuous reactor using anatase nanoparticles, home-prepared by the sol-gel method combined with peptization treatments. Titanium (IV) isopropoxide was used to synthesize amorphous titania precursor, partially transformed into crystalline nanoparticles by hydrothermal or thermal treatments. The main oxidation product was carbon dioxide, but traces of benzene and benzoic acid were also detected. In order to characterize the catalysts, the evolution of titanium (IV) alkoxide to form anatase [read more]

Bifunctional TiCo electrocatalysts based on N-doped graphene cryogels for the oxygen evolution and reduction reactions

Autores: Luque-Centeno J.M.; Martínez-Huerta M.V.; Sebastián D.; Baglio V.; Lázaro M.J.

Carbon vol: 218
Date: 2024
Doi: 10.1016/j.carbon.2023.118615.

Resumen:
Three-dimensional N-doped graphene cryogels (NGC) modified with Ti and Co nanoparticles are investigated as bifunctional oxygen electrocatalysts for potential application in unitized regenerative fuel cells (URFCs). These composites have been successfully produced via a combined solvothermal, freeze-drying, and thermal treatment procedure. Crystallographic structure, surface properties, and morphology are analyzed to study the influence of each metal and the bimetallic combination in forming active sites for oxygen reduction (ORR) and oxygen evolution (OER) reactions. The intrinsic catalytic activity of the composites was determined by rotating disk [read more]

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Oxygen vacancies and tailored redox activity encountered with NiCo2O4 nanostructures for promising applications in supercapacitor and water oxidation

Autores: Kumar S.; Tahira A.; Bhatti A.L.; Bhatti M.A.; Ujjan Z.A.; Aftab U.; Kumar S.; Al-Kahtani A.A.; Nafady A.; Dawi E.; Emo M.; Vigolo B.; Infantes-Molina A.; Ibupoto Z.H.

Journal of Energy Storage vol: 77
Fecha: 2024
Doi: 10.1016/j.est.2023.109994.

Resumen:
It is well known that transition metal oxides play a significant role in the development of efficient electrochemical energy storage and conversion systems. However, their application is limited by low electrical conductivity, a limited number of electroactive sites, and limited stability. In this study, nickel‑cobalt bimetallic oxide (NiCo2O4) nanostructures were prepared using orange peel extract and its fruit juice during hydrothermal method. The use [read more]

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H2 production through aqueous phase reforming of ethanol over molybdenum carbide catalysts supported on zirconium oxide.

Autores: Pavesi Contreras C.; Blanco E.; Pazo C.; Dongil A.B.; Escalona N.

Applied Catalysis A: General vol: 670
Fecha: 2024
Doi: 10.1016/j.apcata.2023.119535.

Resumen:
Molybdenum carbide catalysts supported on monoclinic and tetragonal zirconium oxide were studied for hydrogen production through aqueous phase reforming of ethanol. Catalysts were characterized by N2 physisorption, XRD, TPR and XPS. Results showed that 10%Mo2C/m-ZrO2 was less carburized and had a lower surface area than 10%Mo2C/t-ZrO2 and 10%MoC/t-ZrO2. Mo oxide was identified on the surface as well as two types of Mo oxycarbide and Mo oxynitride. The α crystalline phase of the carbide was more active than β phase and was [read more]

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