Publications (2020)
Publications sorted by date descending
Impact of the PtO loading on mesoporous TiO2 nanoparticles for enhanced photodegradation of Imazapyr herbicide under simulated solar light
Authors: Mkhalid, IA; Fierro, JLG; Mohamed, RM; Alshahri, AA
Article.
J. Nanopart. Res.. vol: 22. page: 1388-0764.
Date: nov-09. 2020.
Doi: 10.1007/s11051-020-05072-6.
Abstract:
The removal of the commonly used herbicides is essential for environmental remediation. In this study, mesoporous TiO2 photocatalysts modified with PtO were synthetized by the template-assisted scheme to develop highly effective materials for the elimination of Imazapyr herbicide under visible-light preservation. The effect of the PtO loading was investigated, and the xPtO-TiO2 materials were deeply considered by N-2 physisorption, XRD, HRTEM, FTIR, DRS UV-Vis, Raman, XPS, PL and photocurrent measurements. Total Imazapyr photodegradation was archived on mesoporous TiO2 photocatalysts loaded with 0.6 and [read more]
Strong effect of light scattering by distribution of TiO2 particle aggregates on photocatalytic efficiency in aqueous suspensions
Authors: Tolosana-Moranchel, A; Pecharroman, C; Faraldos, M; Bahamonde, A
Article.
Chem. Eng. J.. vol: 403. page: 1385-8947.
Date: JAN 1. 2021.
Doi: 10.1016/j.cej.2020.126186.
Abstract:
This work examines the important role of light power absorbed by TiO2 on the photocatalytic degradation of dichloroacetic acid (DCA) in a semi-continuous slurry photoreactor with UV-Vis radiation. This system is an excellent model for understanding the light matter interaction, because DCA is transparent and the acid pH of the solution prevents the formation of large TiO2 aggregates. Under these conditions, the light power absorbed by four different commercial Titania photocatalysts, along the whole volume of the reactor, has been quantitatively calculated [read more]
Controlling Particle Morphology and Pore Size in the Synthesis of Ordered Mesoporous Materials
Authors: Awoke, Y; Chebude, Y; Diaz, I
Article.
Molecules. vol: 25. page: .
Date: NOV. 2020.
Doi: 10.3390/molecules25214909.
Abstract:
Ordered mesoporous materials have attracted considerable attention due to their potential applications in catalysis, adsorption, and separation technologies, as well as biomedical applications. In the present manuscript, we aim at a rational design to obtain the desired surface functionality (Ti and/or hydrophobic groups) while obtaining short channels (short diffusion paths) and large pore size (>10 nm). Santa Barbara Amorphous material SBA-15 and periodic mesoporous organosilica PMO materials are synthesized using Pluronic PE 10400 (P104) surfactant under mild acidic conditions to obtain hexagonal platelet-like particles with very short [read more]
Increasing dimethyl ether production from biomass-derived syngas via sorption enhanced dimethyl ether synthesis
Authors: Liuzzi, D; Peinado, C; Pena, MA; van Kampen, J; Boon, J; Rojas, S
Article.
Sustain. Energ. Fuels. vol: 4. page: 2398-4902.
Date: nov-01. 2020.
Doi: 10.1039/d0se01172j.
Abstract:
The direct synthesis of dimethyl ether (DME) from biomass-derived syngas is a topic of great interest in the field of biofuels. The process takes place in one reactor combining two catalytic functions, Cu/ZnO/Al2O3 (CZA) for the synthesis of methanol and an acid catalyst (typically gamma-Al2O3) for methanol dehydration to DME. However, the catalytic performance of those catalysts is negatively affected by the high CO2/CO ratio in the bio-syngas, resulting in low methanol and DME production rates. In this [read more]
Ficin: A protease extract with relevance in biotechnology and biocatalysis
Authors: Morellon-Sterling, R; El-Siar, H; Tavano, OL; Berenguer-Murcia, A; Fernandez-Lafuente, R
Review.
Int. J. Biol. Macromol.. vol: 162. page: 0141-8130.
Date: nov-01. 2020.
Doi: 10.1016/j.ijbiomac.2020.06.144.
Abstract:
Due to the problems raised by the use of animal or microbial recombinant proteases, the use of proteases from vegetable origin is becoming increasingly popular.. Among them, sulfidryl proteases have a special interest. Ficin is an outstanding example of this kind of proteases. This paper aims to be to make a comprehensive review of the recent uses of this enzyme, including for example protein hydrolysis, the production of bioactive peptides and antibodies fragments (researchers point that ficin results are more [read more]
Social solidarity economy and urban commoning in post-crisis contexts: Madrid and Athens in a comparative perspective
Authors: Arampatzi, A
Article; Early Access.
J. Urban Aff.. vol: . page: 0735-2166.
Date: . .
Doi: 10.1080/07352166.2020.1814677.
Abstract:
The social solidarity economy (SSE), as an alternative paradigm to crisis-prone market-driven capitalism, gained significant momentum during the last decade in cities such as Madrid and Athens that experienced the harsh impact of neoliberal austerity. This article consolidates a debate between divergent accounts of social economy and the commons, in order to bring forward the urban dimension of SSE and the contested spatiality of commoning in crisis-ridden contexts. This gesture lays the ground for unearthing various analytical dimensions of commoning, from urban-based socioeconomic practice, to re-instituting forms [read more]
Biosynthesis of Gold Clusters and Nanoparticles by Using Extracts of Mexican Plants and Evaluation of Their Catalytic Activity in Oxidation Reactions
Authors: Aguilar-Pliego, J; Nunez, RZ; Agundez, J; Valdes, RD; Perez-Pariente, J
Article; Early Access.
Catal. Lett.. vol: . page: 1011-372X.
Date: . .
Doi: 10.1007/s10562-020-03416-4.
Abstract:
This work shows the biosynthesis of gold clusters and nanoparticles (AuNPs) from a solution of gold in a mixture of ammonium chloride and nitric acid treated with two different Mexican plants extracts, Toad Leaf (Eryngium heterophyllum, SF) and Cuachalalate (Amphipterygium adstringens, CF) as bioreductants. Subsequently, the gold entities were supported on the ordered mesoporous material SBA-15 functionalized with mercaptopropyl groups (1.6 wt% of sulphur). The gold contents were 0.7 wt% and 1.1 wt% for the CF and SF samples, respectively. [read more]
Selective hydrogen production from formic acid decomposition over Mo carbides supported on carbon materials
Authors: Carrales-Alvarado, D.H; Dongil, A.B; Fernández-Morales, J.M; Fernández-García, M; Guerrero-Ruiz, A; Rodríguez-Ramos, I
Article.
Catal. Sci. Technol., 2020,10, 6790-6799
Date: October-26. 2020.
Doi: 10.1039/D0CY01088J
Abstract:
The decomposition of formic acid to obtain hydrogen has been studied using molybdenum carbides supported on activated carbon and two high surface area graphites, H200 (200 m2 g−1) and H400 (400 m2 g−1). Particular attention is paid to the effect of Mo loading. The catalysts were prepared in situ using a mixture of CH4 and H2 at a temperature of up to 700 °C. Under these conditions, carburization was mostly complete. We observed that the support influenced the MoxC phase obtained so that it seems [read more]
Effect of Cu and Cs in the beta-Mo2C System for CO2 Hydrogenation to Methanol
Authors: Dongil, AB; Zhang, Q; Pastor-Perez, L; Ramirez-Reina, T; Guerrero-Ruiz, A; Rodriguez-Ramos, I
Article.
Catalysts. vol: 10. page: .
Date: OCT. 2020.
Doi: 10.3390/catal10101213.
Abstract:
Mitigation of anthropogenic CO2 emissions possess a major global challenge for modern societies. Herein, catalytic solutions are meant to play a key role. Among the different catalysts for CO2 conversion, Cu supported molybdenum carbide is receiving increasing attention. Hence, in the present communication, we show the activity, selectivity and stability of fresh-prepared beta-Mo2C catalysts and compare the results with those of Cu/Mo2C, Cs/Mo2C and Cu/Cs/Mo2C in CO2 hydrogenation reactions. The results show that all the catalysts were active, and the main [read more]
Selective hydrogen production from formic acid decomposition over Mo carbides supported on carbon materials
Authors: Carrales-Alvarado, DH; Dongil, AB; Fernandez-Morales, JM; Fernandez-Garcia, M; Guerrero-Ruiz, A; Rodriguez-Ramos, I
Article.
Catal. Sci. Technol.. vol: 10. page: 2044-4753.
Date: oct-21. 2020.
Doi: 10.1039/d0cy01088j.
Abstract:
The decomposition of formic acid to obtain hydrogen has been studied using molybdenum carbides supported on activated carbon and two high surface area graphites, H-200 (200 m(2) g(-1)) and H400 (400 m(2) g(-1)). Particular attention is paid to the effect of Mo loading. The catalysts were prepared in situ using a mixture of CH4 and H-2 at a temperature of up to 700 degrees C. Under these conditions, carburization was mostly complete. We observed that the support influenced the [read more]
Biocide mechanism of highly efficient and stable antimicrobial surfaces based on zinc oxide-reduced graphene oxide photocatalytic coatings
Authors: Valenzuela, L; Iglesias-Juez, A; Bachiller-Baeza, B; Faraldos, M; Bahamonde, A; Rosal, R
Article.
J. Mat. Chem. B. vol: 8. page: 2050-750X.
Date: sep-28. 2020.
Doi: 10.1039/d0tb01428a.
Abstract:
Highly efficient photoactive antimicrobial coatings were obtained using zinc oxide-reduced graphene oxide nanocomposites (ZnO-rGO). Their remarkable antibacterial activity and high stability demonstrated their potential use for photoactive biocide surfaces. The ZnO-rGO nanocomposites were prepared by the sol-gel technique to create photocatalytic surfaces by spin-coating. The coatings were deeply characterised and several tests were performed to assess the antibacterial mechanisms. rGO was homogeneously distributed as thin sheets decorated with ZnO nanoparticles. The surface roughness and the hydrophobicity increased with [read more]
Specific chemical incorporation of L-DOPA and functionalized L-DOPA-hyaluronic acid in Candida antarctica lipase: creating potential mussel-inspired bioadhesives
Authors: Jaramillo, J; Rodriguez-Oliva, I; Abian, O; Palomo, JM
Article.
SN Appl. Sci.. vol: 2. page: 2523-3963.
Date: sep-24. 2020.
Doi: 10.1007/s42452-020-03545-w.
Abstract:
Mussel adhesives proteins have been extensively studied as a promising alternative in bioadhesives due to their ability to provide durable anchoring under different surfaces in seawater. These charasteristics have been attributed to the presence of the reduced catechol form, 3,4-dihydroxyphenylalanine (DOPA) of its structure. However, its practical applications have been limited due to drawbacks with natural extraction. Here, a novel method have been described for site-specific chemical incorporation of L-3,4-dihydroxyphenylalanine methyl ester (L-DOPAME) into proteins, in particular Candida antartica fraction B (CAL-B) lipase. [read more]
Spinel-Type nitride compounds with improved features as solar cell absorbers
Authors: Sanchez-Palencia, P; Garcia, G; Conesa, JC; Wahnon, P; Palacios, P
Article.
Acta Mater.. vol: 197. page: 1359-6454.
Date: sep-15. 2020.
Doi: 10.1016/j.actamat.2020.07.034.
Abstract:
Ternary spinel nitrides are a new class of semiconductor materials with tunable bandgap in the visible range. In this work, we report a rational design of spinel-type nitride compounds with improved features as solar cell absorber materials by way of the in-gap-band (IGB) concept. For this purpose, a systematic screening on the effect of transition metal (M = Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Nb, Mo) hyper -doping on the crystal and electronic structure properties of germanium (Ge) [read more]
Sunlight-Operated TiO2-Based Photocatalysts
Authors: Barba-Nieto, I; Caudillo-Flores, U; Fernandez-Garcia, M; Kubacka, A
Review.
Molecules. vol: 25. page: .
Date: SEP. 2020.
Doi: 10.3390/molecules25174008.
Abstract:
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]
Direct Synthesis of Dimethyl Ether from Syngas on Bifunctional Hybrid Catalysts Based on Supported H(3)PW(12)O(40)and Cu-ZnO(Al): Effect of Heteropolyacid Loading on Hybrid Structure and Catalytic Activity
Authors: Millan, E; Mota, N; Guil-Lopez, R; Pawelec, B; Fierro, JLG; Navarro, RM
Article.
Catalysts. vol: 10. page: .
Date: SEP. 2020.
Doi: 10.3390/catal10091071.
Abstract:
The performance of bifunctional hybrid catalysts based on phosphotungstic acid (H3PW12O40, HPW) supported on TiO(2)combined with Cu-ZnO(Al) catalyst in the direct synthesis of dimethyl ether (DME) from syngas has been investigated. We studied the effect of the HPW loading on TiO2(from 1.4 to 2.7 monolayers) on the dispersion and acid characteristics of the HPW clusters. When the concentration of the heteropoliacid is slightly higher than the monolayer (1.4 monolayers) the acidity of the clusters is perturbed by the surface of titania, [read more]
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