Publicaciones ordenadas por fecha de forma descendente
Assessing quantitatively charge carrier fate in 4-chlorophenol photocatalytic degradation using globular titania catalysts: Implications in quantum efficiency calculation
Autores: Caudillo-Flores, U; Aviles-Garcia, O; Alonso-Nunez, G; Kubacka, A; Fernandez-Garcia, M
J. Environ. Chem. Eng.. vol: 9. page: .
Fecha: OCT. 2021.
The complex interplay between photons and catalytic powders in liquid-phase photocatalytic degradation reactions requires combined computational and experimental approaches to render a quantitative assessment of the light harvesting and handling properties the system. The full assessment of the light-to-chemical efficiency is here presented for the first of time for the complex 4-chlorophenol degradation. The reaction is carried out under different illumination conditions (UV, visible) with advanced, globular titania catalysts displaying high activity with respect to P25 and other reference materials. [read more]
Impact of water matrix and oxidant agent on the solar assisted photodegradation of a complex mix of pesticides over titania-reduced graphene oxide nanocomposites
Autores: Luna-Sanguino, G; Ruiz-Delgado, A; Duran-Valle, CJ; Malato, S; Faraldos, M; Bahamonde, A
Catal. Today. vol: 380. page: 0920-5861.
Fecha: nov-15. 2021.
New titania-reduced graphene oxide (TiO2-rGO) nanocomposites have been studied to assess their application in the solar assisted photodegradation of a complex mixing of pesticides (pyrimethanil, isoproturon, alachlor and methomyl) at solar pilot plant, opening the opportunity to extend the use of these hybrid photocatalysts to complex wastewater effluents. TiO2-rGO nanocomposites were prepared by hydrothermal method from two commercial TiO2, Hombikat UV-100 (HBK) and Aeroxide (R) P25 (P25). The effect of two different water matrices (simulated and natural) on TiO2-rGO solar [read more]
Oxide-based composites: applications in thermo-photocatalysis
Autores: Barba-Nieto, I; Gomez-Cerezo, N; Kubacka, A; Fernandez-Garcia, M
Review; Early Access.
Catal. Sci. Technol.. vol: . page: 2044-4753.
Fecha: . .
The combination of thermal and photonic energy sources to carry out catalyzed chemical reactions appears as a new avenue to optimize the current industrial-oriented processes as well as to open new ones. Herein, we analyze the contribution of novel oxide-based composite systems to the thermo-photocatalysis field. In the first place, the review article gives a brief introduction about the physicochemical framework to interpret the thermo-photocatalytic properties of oxide-based solids. From this point and to provide an overview of the progress of [read more]
Immobilization of papain: A review
Autores: Tacias-Pascacio, VG; Morellon-Sterling, R; Castaneda-Valbuena, D; Berenguer-Murcia, A; Kamli, MR; Tavano, O; Fernandez-Lafuente, R
Int. J. Biol. Macromol.. vol: 188. page: 0141-8130.
Fecha: oct-01. 2021.
Papain is a cysteine protease from papaya, with many applications due to its broad specificity. This paper reviews for first time the immobilization of papain on different supports (organic, inorganic or hybrid supports) presenting some of the features of the utilized immobilization strategies (e.g., epoxide, glutaraldehyde, genipin, glyoxyl for covalent immobilization). Special focus is placed on the preparation of magnetic biocatalysts, which will permit the simple recovery of the biocatalyst even if the medium is a [read more]
Structure and evolutionary trace-assisted screening of a residue swapping the substrate ambiguity and chiral specificity in an esterase
Authors: Cea-Rama, I; Coscolin, C; Katsonis, P; Bargiela, R; Golyshin, PN; Lichtarge, O; Ferrer, M; Sanz-Aparicio, J
Comp. Struct. Biotechnol. J… vol: 19. page: 2001-0370.
Date: . 2021.
Our understanding of enzymes with high substrate ambiguity remains limited because their large active sites allow substrate docking freedom to an extent that seems incompatible with stereospecificity. One possibility is that some of these enzymes evolved a set of evolutionarily fitted sequence positions that stringently allow switching substrate ambiguity and chiral specificity. To explore this hypothesis, we targeted for mutation a serine ester hydrolase (EH3) that exhibits an impressive 71-substrate repertoire but is not [read more]
Surface Enhanced Infrared Characterization Using Disordered Slit-Antenna Arrays for the Detection of Electrodeposited Cytochrome C
Authors: Armelles, G; Cebollada, A; Cava, DG; Alvarez-Malmagro, J; Velez, M
Article; Early Access.
Plasmonics. vol: . page: 1557-1955.
Date: . .
An approach which allows both electrochemical studies and surface enhanced infrared characterization of electrodeposited Cytochrome C is presented. This approach is based on in-plane disordered arrays of resonant slits engraved in Au substrates using focused ion beam. For light-polarized perpendicular to the slit, the reflectivity spectra of the slit arrays show dips related to the excitation of the slit plasmon resonance, whose position depends on the slit length. Due to the presence of the continuous Au layer around the slits, the [read more]
Interpreting quantum efficiency for energy and environmental applications of photo-catalytic materials
Authors: Kubacka, A; Barba-Nieto, I; Caudillo-Flores, U; Fernandez-Garcia, M
Curr. Opin. Chem. Eng.. vol: 33. page: 2211-3398.
Date: SEP. 2021.
The use of efficiency observables to measure activity is of critical importance in order to progress in the quantitative assessment of the functional properties of photo-catalysts in energy and environmental related applications. In this quest, the analysis of the experimental/computational procedures to obtain efficiency observables and the associated unsolved problems are reviewed. Particularly, the contribution analyzes the current efforts to fully interpret the effect(s) of the light-matter interaction as well as the dimensionality of the observable..
Defective UiO-66(Zr) as an efficient catalyst for the synthesis of bio jet-fuel precursors via aldol condensation of furfural and MIBK
Autores: de la Flor, D; Lopez-Aguado, C; Paniagua, M; Morales, G; Mariscal, R; Melero, JA
J. Catal.. vol: 401. page: 0021-9517.
Fecha: SEP. 2021.
The production of jet-fuel precursors from furfural (FUR) via aldol-condensation with methyl-isobutyl ketone (MIBK) over a defective UiO-66(Zr) catalyst is presented. The resultant C11 adduct (FuMe) would allow the selective production of branched alkanes in the range of jet fuel via a subsequent hydrogenation/hydrodeoxygenation process. The catalyst is prepared using formic acid as modulator, leading to the incorporation of defects on the microcrystalline structure of the metalorganic framework (MOF) material, which dramatically boosts the catalytic performance in this [read more]
High thermoelectric efficiency in electrodeposited silver selenide films: from Pourbaix diagram to a flexible thermoelectric module
Authors: Manzano, CV; del Olmo, CL; Caballero-Calero, O; Martin-Gonzalez, M
Sustain. Energ. Fuels. vol: 5. page: 2398-4902.
Date: sep-21. 2021.
In the last few years, the exploration of new thermoelectric materials with low-toxicity, earth-abundance, and high-efficiency has become essential. Following this trend, sustainable, easily scalable, and cost-effective fabrication methods, such as electrochemical deposition, are also desirable. In this work, the Pourbaix diagram of silver-selenium-water was developed to find an adequate pH and reduction potential for the electrodeposition of stable silver selenide. Based on this diagram, a solution without the incorporation of additives was developed. Silver selenide films were electrodeposited at different reduction [read more]
High performance of electrosprayed graphene oxide/TiO2/Ce-TiO2 photoanodes for photoelectrocatalytic inactivation of S. aureus
Autores: Valenzuela, L; Faraldos, M; Bahamonde, A; Rosal, R
Electrochim. Acta. vol: 395. page: 0013-4686.
Fecha: nov-01. 2021.
Microbial contamination is a challenging concern due to the health threat caused by infections. Therefore, the development of efficient antimicrobial materials and processes is a crucial need for disinfecting water and surfaces. In this study, electrospray was used to prepare composite photoanodes for photoelectrodisinfection. Titanium dioxide (TiO2) and cerium-doped titanium dioxide (Ce TiO2) composites with Graphene Oxide (GO) were electrosprayed onto graphite paper to create homogeneous coatings of uniformly distributed nanoparticle aggregates with a layer thickness of 1.0-1.5 mu m. The photoanodes were irradiated [read more]
Sunlight-Operated TiO2-Based Photocatalysts
Autores: Barba-Nieto, I; Caudillo-Flores, U; Fernandez-Garcia, M; Kubacka, A
Molecules. vol: 25. page: .
Fecha: SEP. 2020.
Photo-catalysis is a research field with broad applications in terms of potential technological applications related to energy production and managing, environmental protection, and chemical synthesis fields. A global goal, common to all of these fields, is to generate photo-catalytic materials able to use a renewable energy source such as the sun. As most active photocatalysts such as titanium oxides are essentially UV absorbers, they need to be upgraded in order to achieve the fruitful use of the whole solar spectrum, from UV to infrared wavelengths. [read more]
The use of inorganic Al-HMS as a support for NiMoW sulfide HDS catalysts
Authors: Huirache-Acuna, R; Zepeda, TA; Vazquez, PJ; Rivera-Munoz, EM; Maya-Yescas, R; Pawelec, B; Alonso-Nunez, G
Inorg. Chim. Acta. vol: 524. page: 0020-1693.
Date: sep-01. 2021.
Inorganic hexagonal mesoporous silica (HMS) and aluminum modified HMS materials (Al-HMS) were prepared and used as supports of transition metal sulfide hydrodesulfurization (HDS) catalysts based on nickel, molybdenum, and tungsten as active phase. The samples were characterized with XRD, HRTEM, TPD, N2 physisorption and UV-Vis. The catalytic activity of the trimetallic catalysts was performed in the HDS of dibenzothiophene (DBT). When Al was incorporated into the inorganic support, important changes and effects were observed on the physicochemical [read more]
In Vitro Antiviral Activity of Tyrosinase from Mushroom Agaricus bisporus against Hepatitis C Virus
Authors: Lopez-Tejedor, D; Claveria-Gimeno, R; Velazquez-Campoy, A; Abian, O; Palomo, JM
Pharmaceuticals. vol: 14. page: .
Date: AUG. 2021.
Tyrosinases from a commercial Agaricus bisporus protein extract and directly isolated from white mushrooms were purified in order to obtaining the well-known tyrosinase from A. bisporus (TyrAB) of 45 kDa and a newly discovered 50 kDa tyrosinase isoform (Tyr50 kDa), and tested showing high antiviral activity against the hepatitis C virus for the first time. Cell toxicity and antiviral activity of tyrosinases were determined in cultured Huh 5-2 liver tumor cells transfected with a replicon system (a plasmid that includes all non-structural hepatitis [read more]
Catalytic and molecular insights of the esterification of ibuprofen and ketoprofen with glycerol
Authors: Toledo, MV; Jose, C; Suster, CRL; Collins, SE; Portela, R; Banares, MA; Briand, LE
Mol. Catal.. vol: 513. page: 2468-8231.
Date: AUG. 2021.
The esterification of rac-ibuprofen and rac-ketoprofen with glycerol catalyzed with the commercial biocatalyst Novozym (R) 435 was investigated at 45 degrees C with various profen: glycerol molar ratios using 2-propanol as co-solvent in a batch type reaction. The conversion of rac-ibuprofen reached 46%, with an enantiomeric excess towards the S-enantiomer of 42%. When 1:4 ibuprofen:glycerol molar ratio was assayed, 75% of the R-ibuprofen reacted with glycerol towards the monoglyceride with 99% selectivity, which is highly relevant in the [read more]
Tuning the selectivity to aldehyde via pH regulation in the photocatalytic oxidation of 4-methoxybenzyl alcohol and vanillyl alcohol by TiO2 catalysts
Authors: Bellardita, M; Yurdakal, S; Tek, BS; Degirmenci, C; Palmisano, G; Loddo, V; Palmisano, L; Soria, J; Sanz, J; Augugliaro, V
J. Environ. Chem. Eng.. vol: 9. page: .
Date: AUG. 2021.
The influence of pH on the photocatalytic partial oxidation of 4-methoxybenzyl alcohol (MBA) and vanillyl alcohol (VA) to their corresponding aldehydes in aqueous suspension under UVA irradiation was investigated by using poorly crystalline home-prepared and crystalline commercial TiO2 (BDH, Merck and Degussa P25) photocatalysts. The results clearly show as tuning pH can strongly impart selectivity and activity to photocatalytic processes which are often quite unselective in aqueous suspensions. It was [read more]