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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 [leer más]

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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 [leer más]

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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 [leer más]

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 [leer más]

Advances in catalytic routes for the production of carboxylic acids from biomass: a step forward for sustainable polymers

Authors: Iglesias, J; Martinez-Salazar, I; Maireles-Torres, P; Alonso, DM; Mariscal, R; Granados, ML

Review.
Chem. Soc. Rev.. vol: 49. page: 0306-0012.
Date: AUG 21. 2020.
Doi: 10.1039/d0cs00177e.

Abstract:
Polymers are ubiquitously present in our daily life because they can meet a wide range of needs and fields of applications. This success, based on an irresponsible linear consumption of plastics and the access to cheap oil, is creating serious environmental problems. Two lines of actions are needed to cope with them: to adopt a circular consumption of plastics and to produce renewable carbon-neutral monomers. This review analyses the recent advances in the chemocatalytic [leer más]

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Efficient One-Step Immobilization of CaLB Lipase over MOF Support NH2-MIL-53(Al)

Authors: Gascon-Perez, V; Jimenez, MB; Molina, A; Blanco, RM; Sanchez-Sanchez, M

Article.
Catalysts. vol: 10. page: .
Date: AUG. 2020.
Doi: 10.3390/catal10080918.

Abstract:
Metal-organic framework (MOF) materials possess the widest versatility in structure, composition, and synthesis procedures amongst the known families of materials. On the other hand, the extraordinary affinity between MOFs and enzymes has led to widely investigating these materials as platforms to support these catalytic proteins in recent years. In this work, the MOF material NH2-MIL-53(Al) has been tested as a support to immobilize by one-step methodology (in situ) the enzyme lipase CaLB fromCandida antarcticaby employing conditions that are compatible with its enzymatic activity [leer más]

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Effect of photodeposition conditions on Ni-CdS photocatalysts and its role in the photoactivity for H-2 production from ethanolic solutions

Authors: Cebada, S; Soto, E; Mota, N; Fierro, JLG; Navarro, RM

Article; Proceedings Paper.
Int. J. Hydrog. Energy. vol: 45. page: 0360-3199.
Date: AUG 14. 2020.
Doi: 10.1016/j.ijhydene.2020.01.169.

Abstract:
The incorporation of Ni-based cocatalysts on CdS by photodeposition has been investigated as a way of improving the photocatalytic efficiency of CdS for the production of hydrogen from ethanolic solutions under solar light. Specifically, this work investigates the effect of the concentration of CdS in the suspensions used in the photodeposition of Ni over the structure, chemical state, and dispersion of the Ni species deposited on CdS. The change in the concentration of CdS during photodeposition leads [leer más]

Facile synthesis of B/g-C(3)N(4)composite materials for the continuous-flow selective photo-production of acetone

Authors: Caudillo-Flores, U; Rodriguez-Padron, D; Munoz-Batista, MJ; Kubacka, A; Luque, R; Fernandez-Garcia, M

Article.
Green Chem.. vol: 22. page: 1463-9262.
Date: AUG 7. 2020.
Doi: 10.1039/d0gc01326a.

Abstract:
In this work versatile boron-carbon nitride composite materials were synthesized and utilized in a sustainable process using sunlight as the energy source for the continuous-flow selective photocatalytic production of acetone from 2-propanol. It is worth highlighting that the sample preparation was carried out by an environmentally friendly strategy, without a solvent or additional reagents. Samples containing boron in 1-10 wt% were subjected to physico-chemical characterization using XRD, porosimetry, UV-visible spectroscopy, TEM, energy-dispersive X-ray spectroscopy and [leer más]

Alkaline treatment as a means to boost the activity of TiO(2)in selective photocatalytic processes

Authors: Yurdakal, S; Cetinkaya, S; Augugliaro, V; Palmisano, G; Soria, J; Sanz, J; Torralvo, MJ; Livraghi, S; Giamello, E; Garlisi, C

Article.
Catal. Sci. Technol.. vol: 10. page: 2044-4753.
Date: AUG 7. 2020.
Doi: 10.1039/d0cy00755b.

Abstract:
In this work, the activity enhancement of TiO(2)photocatalysts by alkaline treatment has been investigated. Commercial (BDH, U.K., anatase phase) TiO(2)samples, treated in alkaline solutions of NaOH at different concentrations and temperatures, were tested for the photocatalytic partial oxidation of 3-pyridinemethanol in water under UVA irradiation to form vitamin B-3. Photocatalyst characterization has been carried out by XRD, BET, TEM, TGA, photoluminescence, FTIR, Raman, DRS, EPR and photocurrent measurements. The alkaline-treated [leer más]

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Photocatalytic toluene degradation: braiding physico-chemical and intrinsic kinetic analyses

Authors: Caudillo-Flores, U; Fernandez-Garcia, M; Kubacka, A

Article.
REACT. CHEM. ENG.. vol: 5. page: 2058-9883.
Date: AUG 1. 2020.
Doi: 10.1039/d0re00211a.

Abstract:
In this study, we analyzed the photocatalytic degradation of toluene using composite systems consisting of a tungsten oxide component supported on a pure anatase phase. To scrutinize the photocatalytic process, herein we presented a new method with combined spectroscopic and kinetic tools to provide novel and quantitative information mostly obtainedin situunder reaction conditions. First, it allows us to extract information quantitatively, regarding charge recombination and the fraction of kinetically relevant charge species reaching the surface of the material and used in chemical steps. In [leer más]

Synthesis of large-pore zeolites from chiral structure-directing agents with twol-prolinol units

Authors: Gomez-Hortiguela, L; Mayoral, A; Liu, HN; Sierra, L; Vaquerizo, L; Mompean, C; Perez-Pariente, J

Article.
Dalton Trans.. vol: 49. page: 1477-9226.
Date: jul-28. 2020.
Doi: 10.1039/d0dt01834a.

Abstract:
In this work, we perform an in-depth experimental and computational study about the structure-directing effect of two new chiral organic quaternary ammonium dications bearing twoN-methyl-prolinol units linked by a xylene spacer inparaormetarelative orientation, displaying four enantiopure stereogenic centers in (S) configuration. Synthesis results show that thepara-xylene derivative is an efficient structure-directing agent, promoting the crystallization of ZSM-12 (in pure-silica composition), beta zeolite (as pure-silica, or in the presence of Al or Ge), and a mixture of polymorphs C, [leer más]

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Molecular characterization and heterologous expression of two alpha-glucosidases from Metschnikowia spp, both producers of honey sugars

Authors: Garcia-Gonzalez, M; Minguet-Lobato, M; Plou, FJ; Fernandez-Lobato, M

Article.
Microb. Cell. Fact.. vol: 19. page: .
Date: jul-11. 2020.
Doi: 10.1186/s12934-020-01397-y.

Abstract:
Background: alpha-Glucosidases are widely distributed enzymes with a varied substrate specificity that are traditionally used in biotechnological industries based on oligo- and polysaccharides as starting materials. According to amino acid sequence homology, alpha-glucosidases are included into two major families, GH13 and GH31. The members of family GH13 contain several alpha-glucosidases with confirmed hydrolytic activity on sucrose. Previously, a sucrose splitting activity from the nectar colonizing yeast Metschnikowia reukaufii which produced rare sugars with alpha-(1 -> 1), alpha-(1 -> 3) and alpha-(1 -> 6) [leer más]

Direct Synthesis of Phenols from Phenylboronic Acids in Aqueous Media Catalyzed by a Cu(0)‐Nanoparticles Biohybrid

Authors: McCarthy , C; Losada‐Garcia , N; Palomo, J.M.

Article.
ChemistrySelect. vol: 5. Issue:25. page: 7492-7496
Date: july-7. 2020.
Doi: doi.org/10.1002/slct.202002110

Abstract:
Selective hydroxylation of different phenylboronic acids to phenols was successfully carried out by using Cu nanoparticles‐enzyme hybrid catalysts in water and room temperature. Different Cu‐enzyme hybrids containing Cu(II), Cu(I) and Cu(0) nanoparticles species respectively were tested on the monohydroxylation of phenylboronic acid under these mild conditions being hybrids containing Cu(0)NPs the best catalysts, with total selectivity and formation of phenol as unique product. Also, the addition of hydrogen peroxide or the increase of reaction temperature [leer más]

High Degradation of Trichloroethylene in Water by Nanostructured MeNPs@CALB Biohybrid Catalysts

Authors: Losada‐Garcia, N; Rodriguez-Otero, A; Palomo, J.M.

Article.
Catalysts. vol: 10(7), page: 753
Date: july-3. 2020.
Doi: doi.org/10.3390/catal10070753

Abstract:
In this study, a methodology was developed for the rapid degradation of trichloroethylene (TCE) and 1,1-dichloroethylene (1,1-DCE) in distilled water and room temperature without the production of toxic chlorinated by-products. This process was carried out using bionanohybrids of different metals (Pd, Fe, Cu and Zn) obtained by enzyme–metal coordination called MeNPs@CALB, which present different metal species and nanoparticle sizes. The Cu2O@CALB biohybrid, which contained Cu2O nanoparticles, showed excellent catalytic performance in TCE degradation by removing 95% (>125 ppm) in 10 min using 1.5 [leer más]

High Degradation of Trichloroethylene in Water by Nanostructured MeNPs@CALB Biohybrid Catalysts

Authors: Losada-Garcia, N; Rodriguez-Otero, A; Palomo, JM

Article.
Catalysts. vol: 10. page: .
Date: JUL. 2020.
Doi: 10.3390/catal10070753.

Abstract:
In this study, a methodology was developed for the rapid degradation of trichloroethylene (TCE) and 1,1-dichloroethylene (1,1-DCE) in distilled water and room temperature without the production of toxic chlorinated by-products. This process was carried out using bionanohybrids of different metals (Pd, Fe, Cu and Zn) obtained by enzyme-metal coordination called MeNPs@CALB, which present different metal species and nanoparticle sizes. TheCu(2)O@CALBbiohybrid, which contained Cu2O nanoparticles, showed excellent catalytic performance in TCE degradation by removing 95% (>125 ppm) in 10 min using 1.5 g/L of catalyst. On the other [leer más]

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