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Publications (2022)

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Electrocatalytic Oxygen Reduction Reaction on 48-Tungsto-8-Phosphate Wheel Anchored on Carbon Nanomaterials

Authors: Novais, HC; Jarrais, B; Haider, A; Kortz, U; Guerrero-Ruiz, A; Rodriguez-Ramos, I; Freire, C; Fernandes, DM

Article; Early Access.
Electrocatalysis. vol: . page: 1868-2529.
Date: . .
Doi: 10.1007/s12678-022-00792-w.

Abstract:
Regardless of great efforts, the development of novel low cost electrocatalysts with high electrocatalytic activity for the oxygen reduction reaction (ORR) remains a real challenge. This is a setback for the mass commercialization of one of the eco-friendliest alternative power sources: fuel cells (FCs). Thus, this work describes the preparation of four composites based on the 48-tungsto-8-phosphate polyanion salt K28Li5[H7P8W48O184]center dot 92H(2)O (KLi-P8W48) immobilized on four distinct carbon materials, namely graphene flakes (GF), single-walled carbon [read more]

POLYANILINE SUPPORTED g-C3N4/CeO2 FLUORESCENT CHEMOSENSOR FOR SELECTED HEAVY METAL AND NITRATE IONS DETERMINATION

Authors: Ali, AH; Diaz, I; Tsegaye, AA; Mengesha, AT

Article.
Acta Chem. Iasi. vol: 30. page: 2067-2438.
Date: . 2022.
Doi: 10.47743/achi-2022-1-0003.

Abstract:
The increasing of toxic heavy metal and nitrate ions contamination in water and food systems worldwide has become a core problem. Therefore, the development of real-time, highly sensitive and selective, simple technique for nitrate and toxic heavy metals ions (mercury, copper and arsenic) detection in water and food at ultralow concentrations are important for maintaining their safe deliveries to consumers. A highly efficient fluorescent chemosensor-based on polyaniline supported g-C3N4/CeO2 nanocomposite for selective heavy metal and nitrate ions have been successfully developed in this [read more]

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Affinity-matured DLL4 ligands as broad-spectrum modulators of Notch signaling

Authors: David Gonzalez-Perez, Satyajit Das, Daniel Antfolk, Hadia S. Ahsan, Elliot Medina, Carolyn E. Dundes, Rayyan T. Jokhai, Emily D. Egan, Stephen C. Blacklow, Kyle M. Loh, Paulo C. Rodriguez & Vincent C. Luca

Article;
Nature Chemical Biology. 19, pages9–17
Date: sept. 2022
Doi: 10.1039/d2se01073a.

Abstract:

The Notch pathway regulates cell fate decisions and is an emerging target for regenerative and cancer therapies. Recombinant Notch ligands are attractive candidates for modulating Notch signaling; however, their intrinsically low receptor-binding affinity restricts their utility in biomedical applications. To overcome this limitation, we evolved variants of the ligand Delta-like 4 with enhanced affinity and cross-reactivity. A consensus variant [read more]

Physicochemical properties and photocatalytic activity in the 2-propanol degradation of transition metals (Zr, Zn or Nb) doped TiO2 solids

Authors: Jedidi, W; Arfaoui, J; Caudillo-Flores, U; Munoz-Batista, MJ; Ksibi, Z; Kubacka, A; Ghorbel, A; Fernandez-Garcia, M

Article.
Mater. Sci. Eng. B-Adv. Funct. Solid-State Mater.. vol: 286. page: 0921-5107.
Date: DEC. 2022.
Doi: 10.1016/j.mseb.2022.116034.

Abstract:
For improving the photocatalytic activity of titania under UV or sunlight (SL) irradiations in the gaseous phase degradation of 2-propanol, M-TiO2 catalysts were synthesized by the sol-gel method (with M = Zr, Zn and Nb) and characterized by various techniques. It was found that the solids show only the diffraction peaks of TiO2 anatase phase with high surface area and porosity. The type of transition metal affects the physicochemical properties and [read more]

Method for analyzing HR-TEM micrographs to propose and/or describe structures and their interaction in crystalline materials

Authors: Obeso-Estrella, R; Pawelec, B; Mota, N; Flores-Sanchez, LA; Quintana-Melgoza, JM; Yocupicio-Gaxiola, RI; Zepeda, TA

Article.
MethodsX. vol: 9. page: .
Date: . 2022.
Doi: 10.1016/j.mex.2022.101855.

Abstract:
A general and versatile method for the analysis and processing of HR-TEM data useful for several applications is presented. The first utility is to identify the structures seen in the micrographs; also can be extended to propose the interaction of structure dynamics between various phases; and also it can be hybridized with the chemical method to make a proposal of new structure and/or phase. The general method consisted of four steps: 1) micrograph pretreatment, 2) measurement of planar distances, [read more]

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Aqueous phase hydrogenation of maleic acid to succinic acid mediated by formic acid: the robustness of the Pd/C catalytic system

Authors: Orozco-Saumell, A; Mariscal, R; Iglesias, J; Maireles-Torres, P; Granados, ML

Article; Early Access.
Sustain. Energ. Fuels. vol: . page: 2398-4902.
Date: . .
Doi: 10.1039/d2se01073a.

Abstract:
Long-term liquid phase studies of the activity in the formic acid-mediated hydrogenation of MAc to SAc were conducted in a fixed bed continuous reactor for two relevant situations: neutralising maleic and formic acids with NaOH and at the pH determined by both acids. Deactivation could only be observed when the catalyst was subjected to a WHSV of MAc above 13 g(MAc) g(cat)(-1) h(-1). Despite this deactivation, the reaction conditions can be adjusted (lowering the reaction temperature and/or decreasing the [read more]

Immobilization-stabilization of the dimeric D-amino acid oxidase from porcine kidney

Authors: Carballares, D; Fernandez-Lafuente, R; Rocha-Martin, J

Article.
Process Biochem.. vol: 122. page: 1359-5113.
Date: NOV. 2022.
Doi: 10.1016/j.procbio.2022.10.002.

Abstract:
This paper shows the immobilization of the dimeric D-amino acid oxidase (DAAO) following different methodologies. Immobilization on glyoxyl-agarose yielded activity recoveries under 5%, and it was discarded. The anion exchange on aminated supports permits the rapid enzyme immobilization, but its activity decreased and the final biocatalysts is less stable than the free enzyme, suggesting that the near presence of a cationic surface is negative for enzyme performance. Treating this biocatalyst with glutaraldehyde led to the full enzyme inactivation. However, immobilization at pH 7 on glutaraldehyde preactivated [read more]

Highly Active and Stable Ni/La-Doped Ceria Material for Catalytic CO2 Reduction by Reverse Water-Gas Shift Reaction

Authors: Consuelo Alvarez-GalvanPablo G. LustembergFreddy E. OropezaBelén Bachiller-BaezaMartin Dapena OspinaMaría HerranzJesús CebolladaLaura Collado, José M. Campos-MartinVíctor A. de la Peña-O’SheaJosé A. Alonso, and M. Verónica Ganduglia-Pirovano.

Article.
ACS Appl. Mater. Interfaces
Date: oct-03. 2022.
Doi: https://doi.org/10.1021/acsami.2c11248

Abstract:
he design of an active, effective, and economically viable catalyst for CO2 conversion into value-added products is crucial in the fight against global warming and energy demand. We have developed very efficient catalysts for reverse water-gas shift (rWGS) reaction. Specific conditions of the synthesis by combustion allow the obtention of macroporous materials based on nanosized Ni particles [read more]

Switch off/switch on of a cysteinyl protease as a way to preserve the active catalytic group by modification with a reversible covalent thiol modifier: Immobilization of ficin on vinyl-sulfone activated supports

Authors: Morellon-Sterling, R; Bolivar, JM; Fernandez-Lafuente, R

Article.
Int. J. Biol. Macromol.. vol: 220. page: 0141-8130.
Date: nov-01. 2022.
Doi: 10.1016/j.ijbiomac.2022.08.155.

Abstract:
The immobilization of ficin (a cysteinyl proteases) on vinyl sulfone agarose produced its almost full inactivation. It was observed that the incubation of the free and immobilized enzyme in beta-mercaptoethanol produced a 20 % of enzyme activity recovery, suggesting that the inactivation due to the immobilization could be a consequence of the modification of the catalytic Cys. To prevent the enzyme inactivation during the immobilization, switching off of ficin via Cys reaction with dipyridyl-disulfide was implemented, giving a reversible disulfide bond that produced a [read more]

Sulfur-doped carbon nanofibers as support for tantalum oxides bifunctional catalysts for the oxygen reduction and evolution reactions

Authors: Ruiz-Cornejo, JC; Sebastian, D; Pardo, JI; Martinez-Huerta, MV; Lazaro, MJ

Article.
J. Power Sources. vol: 546. page: 0378-7753.
Date: oct-30. 2022.
Doi: 10.1016/j.jpowsour.2022.231988.

Abstract:
Highly efficient, low-cost and stable bifunctional catalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are highly desirable for the development of green electrochemical energy storage and conversion devices. Here, we report the synthesis of sulfur-doped carbon nanofibers (CNF) as support for tantalum oxide nanoparticles. Carbon nanofibers and tantalum oxides represent a durable choice for oxygen electrocatalysis, but an improvement of catalytic activity is required. Upon doping, sulfur is found to be mainly bonded to carbon as C-S-C species [read more]

Surface modification of Cu2O-CuO photocatalyst on Cu wire through decorating with TiO(2 )nanoparticles for enhanced visible light photocatalytic activity

Authors: Ansari, F; Sheibani, S; Fernandez-Garcia, M

Article.
J. Alloy. Compd.. vol: 919. page: 0925-8388.
Date: oct-25. 2022.
Doi: 10.1016/j.jallcom.2022.165864.

Abstract:
In this paper, the fabrication of Cu2O-CuO/TiO2 nanocomposite photocatalysts on Cu wire was performed successfully via chemical-thermal oxidation and sol-gel process. The chemical-thermal oxidations were applied for Cu2O-CuO nanostructure fabrication on the Cu wire surface. The sol-gel process was utilized for TiO2 nanoparticles decoration as a surface modification process for photocatalytic activity improvement. The X-ray diffraction analysis (XRD), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS) showed the coexistence of multiple components including Cu2O, CuO, Cu, and TiO2 in the nanocomposite. Field emission electron scanning microscopy [read more]

Surface modification of Cu2O-CuO photocatalyst on Cu wire through decorating with TiO2 nanoparticles for enhanced visible light photocatalytic activity

Authors: Ansari, F; Sheibani, S; Fernandez-Garcia, M

Article.
J. Alloy. Compd.. vol: 919. page: 0925-8388.
Date: oct-25. 2022.
Doi: 10.1016/j.jallcom.2022.165864.

Abstract:
In this paper, the fabrication of Cu2O-CuO/TiO2 nanocomposite photocatalysts on Cu wire was performed successfully via chemical-thermal oxidation and sol-gel process. The chemical-thermal oxidations were applied for Cu2O-CuO nanostructure fabrication on the Cu wire surface. The sol-gel process was utilized for TiO2 nanoparticles decoration as a surface modification process for photocatalytic activity improvement. The X-ray diffraction analysis (XRD), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS) showed the coexistence of multiple components including Cu2O, CuO, Cu, and TiO2 in the nanocomposite. Field emission electron scanning microscopy [read more]

Preface to the JPCM special issue on physical and chemical properties of reducible oxides

Authors: Luches, P; Ganduglia-Pirovano, MV

Editorial Material.
J. Phys.-Condes. Matter. vol: 34. page: 0953-8984.
Date: oct-19. 2022.
Doi: 10.1088/1361-648X/ac877f.

Abstract:
.

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Recent advances in continuous reduction of furfural to added value chemicals

Authors: Richel, A; Maireles-Torres, P; Len, C

Article.
Curr. Opin. Green Sustain. Chem.. vol: 37. page: 2452-2236.
Date: OCT. 2022.
Doi: 10.1016/j.cogsc.2022.100655.

Abstract:
This report describes the recent advances in reduction of furfural to added-value chemicals under liquid phase and gas phase continuous flow systems using conventional activation and using electrochemical activation. The main biobased-chemicals obtained furfuryl alcohol, tetrahydrofurfuryl alcohol, 2-methylfuran and 2-methyltetrahydrofuran are highlighted..

Optimization of the immobilization of xylanase from Thermomyces lanuginosus to produce xylooligosaccharides in a batch type reactor

Authors: Alagoz, D; Varan, NE; Yildirim, D; Fernandez-Lafuente, R

Article.
Mol. Catal.. vol: 531. page: 2468-8231.
Date: OCT. 2022.
Doi: 10.1016/j.mcat.2022.112647.

Abstract:
The xylanase from Thermomyces lanuginosus was immobilized following very different protocols, using 3-aminopropyl (Xyl/CNT-NH2) and carboxylic acid (Xyl/CNT-C) functionalized multi-walled carbon nanotubes or after glutaraldehyde activation of CNT-NH2 (Xyl/CNT-Glu). It was also immobilized on carboxylic acid functionalized multi-walled carbon nanotubes via carbodiimide chemistry (Xyl/CNT-COOH). The free and all the immobilized xylanase derivatives showed maximal catalytic activity at pH 7.5 and at 65 ?. Xyl/CNT-Glu showed 24.0-fold higher thermal stability than the free xylanase at 70 ?. The immobilized xylanase derivatives were used for the [read more]

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