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Prof. Enrique Rodriguez-Castellon
Department of Inorganic Chemistry, Faculty of Science, University of Málaga, 29071 Málaga, Spain

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0 Adsorption
0 Green Chemistry
0 XPS
0 Environmental Catalysis
0 Mterials science

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Journal article
Published: 25 August 2021 in International Journal of Molecular Sciences
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Typical porous silica (SBA-15) has been modified with pore expander agent (1,3,5-trimethylbenzene) and fluoride-species to diminish the length of the channels to obtain materials with different textural properties, varying the Si/Zr molar ratio between 20 and 5. These porous materials were characterized by X-ray Diffraction (XRD), N2 adsorption/desorption isotherms at −196 °C and X-ray Photoelectron Spectroscopy (XPS), obtaining adsorbent with a surface area between 420–337 m2 g−1 and an average pore diameter with a maximum between 20–25 nm. These materials were studied in the adsorption of human blood serum proteins (human serum albumin—HSA and immunoglobulin G—IgG). Generally, the incorporation of small proportions was favorable for proteins adsorption. The adsorption data revealed that the maximum adsorption capacity was reached close to the pI. The batch purification experiments in binary human serum solutions showed that Si sample has considerable adsorption for IgG while HSA adsorption is relatively low, so it is possible its separation.

ACS Style

Diego R. Gondim; Juan A. Cecilia; Thaina N. B. Rodrigues; Enrique Vilarrasa-García; Enrique Rodríguez-Castellón; Diana C. S. Azevedo; Ivanildo J. Silva. Protein Adsorption onto Modified Porous Silica by Single and Binary Human Serum Protein Solutions. International Journal of Molecular Sciences 2021, 22, 9164 .

AMA Style

Diego R. Gondim, Juan A. Cecilia, Thaina N. B. Rodrigues, Enrique Vilarrasa-García, Enrique Rodríguez-Castellón, Diana C. S. Azevedo, Ivanildo J. Silva. Protein Adsorption onto Modified Porous Silica by Single and Binary Human Serum Protein Solutions. International Journal of Molecular Sciences. 2021; 22 (17):9164.

Chicago/Turabian Style

Diego R. Gondim; Juan A. Cecilia; Thaina N. B. Rodrigues; Enrique Vilarrasa-García; Enrique Rodríguez-Castellón; Diana C. S. Azevedo; Ivanildo J. Silva. 2021. "Protein Adsorption onto Modified Porous Silica by Single and Binary Human Serum Protein Solutions." International Journal of Molecular Sciences 22, no. 17: 9164.

Journal article
Published: 19 August 2021 in Applied Sciences
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This research aims to study the possible improvement of methylene blue (MB) removal from aqueous solution by hybrid adsorbent-catalysts (AdsCats) prepared through the incorporation of activated carbon derived from Luffa cylindrica fibers (LAC) to TiO2 photocatalysts. LAC with a specific surface area of 1170 m2/g was prepared by chemical activation with phosphoric acid at 500 °C. TiO2/LAC composites with 70 and 90 wt.% Degussa P25 titania content were prepared. The materials were characterized by N2 physical adsorption, XRD, FTIR, and XPS. The AdsCats displayed a very good dispersion of TiO2 over LAC, a surface area of close to 200 or 400 m2/g, depending on the composition, and high crystallinity, showing the presence of anatase and rutile phases. MB removal was studied in two different scenarios: under UV-light after reaching adsorption equilibrium, and under UV-light once the liquid effluent and the AdsCats were in contact. The MB removal by LAC has proved to be very efficient, highlighting the predominant role of adsorption over photodegradation. The prepared AdsCats have also been compared with their components. The results showed that TiLAC hybrids have superior photocatalytic performance than P25, showing TiLAC-7/3 90% MB removal with respect to the initial concentration just after 30 min of UV light irradiation for both studied scenarios.

ACS Style

Souad Boumad; Antonia Infantes-Molina; Isabel Barroso-Martín; Elisa Moretti; Enrique Rodríguez-Castellón; María Del Carmen Román-Martínez; María Ángeles Lillo-Ródenas; Naima Bouchenafa-Saib. Advantages of the Incorporation of Luffa-Based Activated Carbon to Titania for Improving the Removal of Methylene Blue from Aqueous Solution. Applied Sciences 2021, 11, 7607 .

AMA Style

Souad Boumad, Antonia Infantes-Molina, Isabel Barroso-Martín, Elisa Moretti, Enrique Rodríguez-Castellón, María Del Carmen Román-Martínez, María Ángeles Lillo-Ródenas, Naima Bouchenafa-Saib. Advantages of the Incorporation of Luffa-Based Activated Carbon to Titania for Improving the Removal of Methylene Blue from Aqueous Solution. Applied Sciences. 2021; 11 (16):7607.

Chicago/Turabian Style

Souad Boumad; Antonia Infantes-Molina; Isabel Barroso-Martín; Elisa Moretti; Enrique Rodríguez-Castellón; María Del Carmen Román-Martínez; María Ángeles Lillo-Ródenas; Naima Bouchenafa-Saib. 2021. "Advantages of the Incorporation of Luffa-Based Activated Carbon to Titania for Improving the Removal of Methylene Blue from Aqueous Solution." Applied Sciences 11, no. 16: 7607.

Journal article
Published: 29 July 2021 in Coatings
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Cellulose acetate (CA)/strontium phosphate (SrP) hybrid coating has been proposed as an effective strategy to build up novel bone-like structures for bone healing since CA is soluble in most organic solvents. Strontium (Sr2+) has been reported as a potential agent to treat degenerative bone diseases due to its osteopromotive and antibacterial effects. Herein, bioactive hybrid composite SrP-based coatings (CASrP) were successfully produced for the first time. CASrP was synthesized via a modified biomimetic method (for 7—CA7dSrP, and 14 days—CA14dSrP), in which the metal ion Sr2+ was used in place of Ca2+ in the simulated body fluid. Energy-dispersive X-ray (EDX) and Fourier transform infrared spectroscopy (FTIR) analysis confirmed the SrP incorporation chemically in the CASrP samples. Atomic absorption spectroscopy (AAS) supported EDX data, showing Sr2+ adsorption into CA, and its significant increase with the augmentation of time of treatment (ca. 92%—CA7dSrP and 96%—CA14dSrP). An increment in coating porosity and the formation of SrP crystals were evidenced by scanning electron microscopy (SEM) images. X-ray diffraction (XRD) evidenced a greater crystallinity than CA membranes and a destabilization of CA14dSrP structure compared to CA7dSrP. The composites were extremely biocompatible for fibroblast and osteoblast cells. Cell viability (%) was higher either for CA7dSrP (48 h: ca. 92% and 115%) and CA14dSrP (48 h: ca. 88% and 107%) compared to CA (48 h: ca. 70% and 51%) due to SrP formation and Sr2+ presence in its optimal dose in the culture media (4.6–9 mg·L−1). In conclusion, the findings elucidated here evidence the remarkable potential of CA7dSrP and CA14dSrP as bioactive coatings on the development of implant devices for inducing bone regeneration.

ACS Style

Marcella Maia; Ana Soares; Matheus Caetano; Fábia Andrade; Enrique Rodríguez-Castellón; Rodrigo Vieira. Biomimetic Strontium Substituted Calcium Phosphate Coating for Bone Regeneration. Coatings 2021, 11, 908 .

AMA Style

Marcella Maia, Ana Soares, Matheus Caetano, Fábia Andrade, Enrique Rodríguez-Castellón, Rodrigo Vieira. Biomimetic Strontium Substituted Calcium Phosphate Coating for Bone Regeneration. Coatings. 2021; 11 (8):908.

Chicago/Turabian Style

Marcella Maia; Ana Soares; Matheus Caetano; Fábia Andrade; Enrique Rodríguez-Castellón; Rodrigo Vieira. 2021. "Biomimetic Strontium Substituted Calcium Phosphate Coating for Bone Regeneration." Coatings 11, no. 8: 908.

Journal article
Published: 24 July 2021 in Journal of the European Ceramic Society
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The BiFeO3 –NaNbO3 electroceramics, synthesized by the ceramic method, are studied aiming to obtain materials with a well-defined thermistor response coexisting with a relevant magnetic response. XRD data and Raman analysis reveal a structural transition as a function of composition. Compositional features explored from ICP, XPS and EDS measurements, suggest compositional heterogeneity leading to a cluster-type scenario implying NNO-rich and BFO-rich regions in the samples. Impedance spectroscopy data reveal the development of a PTCR thermistor response for x ≥ 0.5 near room temperature. The x = 0.9 ceramic shows resistivity changes of about six orders of magnitude in the first thermal cycle and maximum permittivity values of ∼ 105, much higher than those previously reported for BFO-doped ceramics. Magnetization data are interpreted in terms of the stabilization of superparamagnetic clusters. The response displayed by the x = 0.9 ceramic makes it a promising multifunctional material for device applications.

ACS Style

D. Giraldo; P. Almodóvar; M.L. López; E. Rodríguez-Aguado; E. Rodríguez-Castellón; A. Galdámez; I. Álvarez-Serrano. Exploring multiferroicity in BiFeO3 - NaNbO3 thermistor electroceramics. Journal of the European Ceramic Society 2021, 41, 7069 -7076.

AMA Style

D. Giraldo, P. Almodóvar, M.L. López, E. Rodríguez-Aguado, E. Rodríguez-Castellón, A. Galdámez, I. Álvarez-Serrano. Exploring multiferroicity in BiFeO3 - NaNbO3 thermistor electroceramics. Journal of the European Ceramic Society. 2021; 41 (14):7069-7076.

Chicago/Turabian Style

D. Giraldo; P. Almodóvar; M.L. López; E. Rodríguez-Aguado; E. Rodríguez-Castellón; A. Galdámez; I. Álvarez-Serrano. 2021. "Exploring multiferroicity in BiFeO3 - NaNbO3 thermistor electroceramics." Journal of the European Ceramic Society 41, no. 14: 7069-7076.

Research article
Published: 06 July 2021 in Industrial & Engineering Chemistry Research
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Hollow microspheres of silica were synthesized and functionalized with amino groups to enhance carbon dioxide adsorption. Functionalization was intended to provide acid–base interaction between CO2 and amine groups. Samples were characterized by N2 adsorption/desorption isotherms at 77 K, X-ray diffraction, scanning electronic microscopy, and Fourier transform infrared spectroscopy. For adsorption experiments, both volumetric and gravimetric devices were used to quantify adsorbed CO2 as a function of pressure and temperature. CO2 adsorption isotherms obtained for the amine grafted silica confirmed the coexistence of chemical and physical adsorption sites within the material, which means that CO2 binding occurs not only by physical mechanisms on micropores but also due to interactions with amino groups. The saturation of the adsorbent with H2S to simulate the purification of natural gas or biogas slightly diminishes CO2 adsorption capacity due to competition between CO2 and H2S for amine sites. Preadsorption of H2O on the H2S saturated adsorbent did not lead to improvements in CO2 uptake. On the contrary, preloaded H2O combined with H2S seems to block some of the chemical sites involved in CO2 adsorption.

ACS Style

J. A. R. de Sousa; R. Amâncio; R. Morales-Ospino; J. L. B. de Oliveira; J. A. Cecilia; E. Vilarrasa-García; M. Bastos-Neto; E. Rodríguez-Castellón; D. C. S. de Azevedo. H2S and H2O Combined Effect on CO2 Capture by Amino Functionalized Hollow Microsphere Silicas. Industrial & Engineering Chemistry Research 2021, 60, 10139 -10154.

AMA Style

J. A. R. de Sousa, R. Amâncio, R. Morales-Ospino, J. L. B. de Oliveira, J. A. Cecilia, E. Vilarrasa-García, M. Bastos-Neto, E. Rodríguez-Castellón, D. C. S. de Azevedo. H2S and H2O Combined Effect on CO2 Capture by Amino Functionalized Hollow Microsphere Silicas. Industrial & Engineering Chemistry Research. 2021; 60 (28):10139-10154.

Chicago/Turabian Style

J. A. R. de Sousa; R. Amâncio; R. Morales-Ospino; J. L. B. de Oliveira; J. A. Cecilia; E. Vilarrasa-García; M. Bastos-Neto; E. Rodríguez-Castellón; D. C. S. de Azevedo. 2021. "H2S and H2O Combined Effect on CO2 Capture by Amino Functionalized Hollow Microsphere Silicas." Industrial & Engineering Chemistry Research 60, no. 28: 10139-10154.

Paper
Published: 09 June 2021 in RSC Advances
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The complex chemical functionalization of the aldehyde group was elucidated in copper and cobalt complexes for 4- and 3-pyridinecarboxaldehyde ligands.

ACS Style

Ayelén F. Crespi; Verónica M. Sánchez; Daniel Vega; Ana L. Pérez; Carlos D. Brondino; Yamila Garro Linck; Paul Hodgkinson; Enrique Rodríguez-Castellón; Juan M. Lázaro-Martínez. Paramagnetic solid-state NMR assignment and novel chemical conversion of the aldehyde group to dihydrogen ortho ester and hemiacetal moieties in copper(ii)- and cobalt(ii)-pyridinecarboxaldehyde complexes. RSC Advances 2021, 11, 20216 -20231.

AMA Style

Ayelén F. Crespi, Verónica M. Sánchez, Daniel Vega, Ana L. Pérez, Carlos D. Brondino, Yamila Garro Linck, Paul Hodgkinson, Enrique Rodríguez-Castellón, Juan M. Lázaro-Martínez. Paramagnetic solid-state NMR assignment and novel chemical conversion of the aldehyde group to dihydrogen ortho ester and hemiacetal moieties in copper(ii)- and cobalt(ii)-pyridinecarboxaldehyde complexes. RSC Advances. 2021; 11 (33):20216-20231.

Chicago/Turabian Style

Ayelén F. Crespi; Verónica M. Sánchez; Daniel Vega; Ana L. Pérez; Carlos D. Brondino; Yamila Garro Linck; Paul Hodgkinson; Enrique Rodríguez-Castellón; Juan M. Lázaro-Martínez. 2021. "Paramagnetic solid-state NMR assignment and novel chemical conversion of the aldehyde group to dihydrogen ortho ester and hemiacetal moieties in copper(ii)- and cobalt(ii)-pyridinecarboxaldehyde complexes." RSC Advances 11, no. 33: 20216-20231.

Research article
Published: 03 June 2021 in Journal of Separation Science
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Separation of ethane-ethylene mixtures was evaluated using two zeolitic imidazolate frameworks, which are only different from the assemble metal, as stationary phase from Inverse Gas Chromatography data. The chromatographic profiles exhibited peaks adequately resolved. Separation is attributed to the pore sizes of the adsorbents which discern between ethane and ethylene molecule shapes and closed kinetic diameters. The adsorption heats were estimated for each probe molecule from the slopes of the straight lines at four temperatures. The evaluated materials are iso-structural compounds with the unique difference of assembling metal (cobalt and zinc). Cobalt material showed atypical adsorption of ethane over ethylene which was observed taking into account the retarded elution of the paraffin. Therefore, the anomalous behavior could be ascribed to the presence of cobalt(II). Structural characterization of both materials was performed by X-ray powder diffraction, X-ray photoelectronic spectroscopy, and Thermogravimetry, while morphological characterization was performed by Scanning Electron Microscopy. H2-CO2 and CH4-CO2 mixtures separation were also evaluated by Inverse Gas Chromatography. Both materials were able to separate these two mixtures. CO2 was the highest retained probe molecule due to the presence of quadrupole moment. This article is protected by copyright. All rights reserved

ACS Style

Giselle Autié‐Castro; Edilso Reguera; Enrique Rodríguez‐Castellón. Different behavior of two iso‐structural zeolitic imidazolate frameworks in ethane–ethylene separation: Study of H 2 ‐CO 2 and CH 4 ‐CO 2 separation capacity. Journal of Separation Science 2021, 1 .

AMA Style

Giselle Autié‐Castro, Edilso Reguera, Enrique Rodríguez‐Castellón. Different behavior of two iso‐structural zeolitic imidazolate frameworks in ethane–ethylene separation: Study of H 2 ‐CO 2 and CH 4 ‐CO 2 separation capacity. Journal of Separation Science. 2021; ():1.

Chicago/Turabian Style

Giselle Autié‐Castro; Edilso Reguera; Enrique Rodríguez‐Castellón. 2021. "Different behavior of two iso‐structural zeolitic imidazolate frameworks in ethane–ethylene separation: Study of H 2 ‐CO 2 and CH 4 ‐CO 2 separation capacity." Journal of Separation Science , no. : 1.

Research article
Published: 28 May 2021 in Inorganic Chemistry Frontiers
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Cu/TiO2 photocatalysts can be considered a promising low-cost alternative to the well-known Pt/TiO2 system for hydrogen production under UV-Vis irradiation.

ACS Style

Laura Diaz; Vicente Rodriguez; Modesto González-Rodríguez; Enrique Rodriguez-Castellon; Manuel Algarra; Pedro Nunez; Elisa Moretti. M/TiO2 (M = Fe, Co, Ni, Cu, Zn) catalysts for photocatalytic hydrogen production under UV and visible light irradiation. Inorganic Chemistry Frontiers 2021, 1 .

AMA Style

Laura Diaz, Vicente Rodriguez, Modesto González-Rodríguez, Enrique Rodriguez-Castellon, Manuel Algarra, Pedro Nunez, Elisa Moretti. M/TiO2 (M = Fe, Co, Ni, Cu, Zn) catalysts for photocatalytic hydrogen production under UV and visible light irradiation. Inorganic Chemistry Frontiers. 2021; ():1.

Chicago/Turabian Style

Laura Diaz; Vicente Rodriguez; Modesto González-Rodríguez; Enrique Rodriguez-Castellon; Manuel Algarra; Pedro Nunez; Elisa Moretti. 2021. "M/TiO2 (M = Fe, Co, Ni, Cu, Zn) catalysts for photocatalytic hydrogen production under UV and visible light irradiation." Inorganic Chemistry Frontiers , no. : 1.

Journal article
Published: 08 May 2021 in Polymers
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High-tech applications require increasing amounts of rare earth elements (REE). Their recovery from low-grade minerals and their recycling from secondary sources (as waste materials) are of critical importance. There is increasing attention paid to the development of new sorbents for REE recovery from dilute solutions. A new generation of composite sorbents based on brown algal biomass (alginate) and polyethylenimine (PEI) was recently developed (ALPEI hydrogel beads). The phosphorylation of the beads strongly improves the affinity of the sorbents for REEs (such as La and Tb): by 4.5 to 6.9 times compared with raw beads. The synthesis procedure (epicholorhydrin-activation, phosphorylation and de-esterification) is investigated by XPS and FTIR for characterizing the grafting route but also for interpreting the binding mechanism (contribution of N-bearing from PEI, O-bearing from alginate and P-bearing groups). Metal ions can be readily eluted using an acidic calcium chloride solution, which regenerates the sorbent: the FTIR spectra are hardly changed after five successive cycles of sorption and desorption. The materials are also characterized by elemental, textural and thermogravimetric analyses. The phosphorylation of ALPEI beads by this new method opens promising perspectives for the recovery of these strategic metals from mild acid solutions (i.e., pH ~ 4).

ACS Style

Yuezhou Wei; Khalid A. M. Salih; Mohammed F. Hamza; Toyohisa Fujita; Enrique Rodríguez-Castellón; Eric Guibal. Synthesis of a New Phosphonate-Based Sorbent and Characterization of Its Interactions with Lanthanum (III) and Terbium (III). Polymers 2021, 13, 1513 .

AMA Style

Yuezhou Wei, Khalid A. M. Salih, Mohammed F. Hamza, Toyohisa Fujita, Enrique Rodríguez-Castellón, Eric Guibal. Synthesis of a New Phosphonate-Based Sorbent and Characterization of Its Interactions with Lanthanum (III) and Terbium (III). Polymers. 2021; 13 (9):1513.

Chicago/Turabian Style

Yuezhou Wei; Khalid A. M. Salih; Mohammed F. Hamza; Toyohisa Fujita; Enrique Rodríguez-Castellón; Eric Guibal. 2021. "Synthesis of a New Phosphonate-Based Sorbent and Characterization of Its Interactions with Lanthanum (III) and Terbium (III)." Polymers 13, no. 9: 1513.

Journal article
Published: 01 May 2021 in Metals
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Currently, surface treatments lead to inducing a superficial layer of several nanometers up to micrometer, which in some cases can be protective. In this experimental work, an oxide layer was generated under different atmospheres (CO2 and steam atmospheres) during the thermal aging treatment of two different maraging grades, 300 and 350. Afterwards, this layer was microstructural and mechanically characterized by advanced characterization techniques at the micro- and submicron length scale to highlight some information related to the generated oxide layer. The results showed that the oxide layer (in both grades) was made up of several compounds like: TiO2, MoO3, hematite (α-Fe2O3), and CoFe2O4, this being the majority compound distributed homogeneously throughout the layer. Furthermore, a nickel-rich austenitic phase at the interphase was mainly made up cobalt ions (Co2+), instead of iron ions (Fe2+), within the spinel lattice.

ACS Style

Mauro Florez; Gemma Fargas Ribas; Joan Rovira; Enrique Vilarrasa-Garcia; Enrique Rodríguez-Castellon; Ana Sousa; Jorge Cardoso; Marcelo Gomes da Silva. Characterization Study of an Oxide Film Layer Produced under CO2/Steam Atmospheres on Two Different Maraging Steel Grades. Metals 2021, 11, 746 .

AMA Style

Mauro Florez, Gemma Fargas Ribas, Joan Rovira, Enrique Vilarrasa-Garcia, Enrique Rodríguez-Castellon, Ana Sousa, Jorge Cardoso, Marcelo Gomes da Silva. Characterization Study of an Oxide Film Layer Produced under CO2/Steam Atmospheres on Two Different Maraging Steel Grades. Metals. 2021; 11 (5):746.

Chicago/Turabian Style

Mauro Florez; Gemma Fargas Ribas; Joan Rovira; Enrique Vilarrasa-Garcia; Enrique Rodríguez-Castellon; Ana Sousa; Jorge Cardoso; Marcelo Gomes da Silva. 2021. "Characterization Study of an Oxide Film Layer Produced under CO2/Steam Atmospheres on Two Different Maraging Steel Grades." Metals 11, no. 5: 746.

Journal article
Published: 24 April 2021 in Materials
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Effects of the incorporation of Cr, Ni, Co, Ag, Al, Ni and Pt cations in titanate nanotubes (NTs) were examined on the NOx conversion. The structural and morphological characterizations evidenced that the ion-exchange reaction of Cr, Co, Ni and Al ions with the NTs produced catalysts with metals included in the interlayer regions of the trititanate NTs whereas an assembly of Ag and Pt nanoparticles were either on the nanotubes surface or inner diameters through an impregnation process. Understanding the role of the different metal cations intercalated or supported on the nanotubes, the optimal selective catalytic reduction of NOx by CO reaction (SCR) conditions was investigated by carrying out variations in the reaction temperature, SO2 and H2O poisoning and long-term stability runs. Pt nanoparticles on the NTs exhibited superior activity compared to the Cr, Co and Al intercalated in the nanotubes and even to the Ag and Ni counterparts. Resistance against SO2 poisoning was low on NiNT due to the trititanate phase transformation into TiO2 and also to sulfur deposits on Ni sites. However, the interaction between Pt2+ from PtOx and Ti4+ in the NTs favored the adsorption of both NOx and CO enhancing the catalytic performance.

ACS Style

José Carmo; Cleanio Lima; Gabriela Mota; Ariane Santos; Ludyane Costa; Anupama Ghosh; Bartolomeu Viana; Monique Silva; João Soares; Samuel Tehuacanero-Cuapa; Rossano Lang; Alcineia Oliveira; Enrique Rodríguez-Castellón; Elena Rodríguez-Aguado. Effects of the Incorporation of Distinct Cations in Titanate Nanotubes on the Catalytic Activity in NOx Conversion. Materials 2021, 14, 2181 .

AMA Style

José Carmo, Cleanio Lima, Gabriela Mota, Ariane Santos, Ludyane Costa, Anupama Ghosh, Bartolomeu Viana, Monique Silva, João Soares, Samuel Tehuacanero-Cuapa, Rossano Lang, Alcineia Oliveira, Enrique Rodríguez-Castellón, Elena Rodríguez-Aguado. Effects of the Incorporation of Distinct Cations in Titanate Nanotubes on the Catalytic Activity in NOx Conversion. Materials. 2021; 14 (9):2181.

Chicago/Turabian Style

José Carmo; Cleanio Lima; Gabriela Mota; Ariane Santos; Ludyane Costa; Anupama Ghosh; Bartolomeu Viana; Monique Silva; João Soares; Samuel Tehuacanero-Cuapa; Rossano Lang; Alcineia Oliveira; Enrique Rodríguez-Castellón; Elena Rodríguez-Aguado. 2021. "Effects of the Incorporation of Distinct Cations in Titanate Nanotubes on the Catalytic Activity in NOx Conversion." Materials 14, no. 9: 2181.

Journal article
Published: 14 April 2021 in Molecular Catalysis
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Sorbitol is a sugar alcohol of great importance in cosmetic, food and pharmaceutical industry as well as the production of biopolymers. This work aimed at the synthesis of sorbitol from the hydrogenation of glucose using Ru/Nb2O5 catalysts in the amorphous and crystalline phases. The catalysts were synthesized from the wet impregnation method and characterized by N2 adsorption isotherms, TGA/DTG, EDXRF, XRD, TPR-H2, XPS and SEM. The catalytic tests presented results of high conversion rates of glucose reaching 85 % and 99 % of selectivity to sorbitol when using Nb2O5 in the crystalline form as support, and 53 % and 55 % in the conversion and selectivity, respectively, when the amorphous phase of Nb2O5 was used as support. The structural modification of the catalytic support positively favored the catalyst activity and sorbitol production, allowing the formation of nanometric particles of the active metal on the surface alongside the increase of the mesoporosity, thereby facilitating the transport of reagents.

ACS Style

Jordan Gonzaga Andrade Batista Silva; Ronaldo Costa Santos; Enrique Rodríguez-Castellón; Leonardo Sena Gomes Teixeira; Luiz Antônio Magalhães Pontes. Catalytic conversion of glucose into sorbitol over niobium oxide supported Ru catalysts. Molecular Catalysis 2021, 507, 111567 .

AMA Style

Jordan Gonzaga Andrade Batista Silva, Ronaldo Costa Santos, Enrique Rodríguez-Castellón, Leonardo Sena Gomes Teixeira, Luiz Antônio Magalhães Pontes. Catalytic conversion of glucose into sorbitol over niobium oxide supported Ru catalysts. Molecular Catalysis. 2021; 507 ():111567.

Chicago/Turabian Style

Jordan Gonzaga Andrade Batista Silva; Ronaldo Costa Santos; Enrique Rodríguez-Castellón; Leonardo Sena Gomes Teixeira; Luiz Antônio Magalhães Pontes. 2021. "Catalytic conversion of glucose into sorbitol over niobium oxide supported Ru catalysts." Molecular Catalysis 507, no. : 111567.

Research article
Published: 30 March 2021 in Materials Chemistry Frontiers
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The photocatalytic activity of titania nanotubes and nanoparticles toward methylene blue (MB) can be enhanced through addition of a small amount of Ce. MB acts as a hole scavenger, fastening the photocatalytic process.

ACS Style

Chiara Alberoni; Isabel Barroso-Martín; Antonia Infantes-Molina; Enrique Rodríguez-Castellón; Aldo Talon; Haiguang Zhao; Shujie You; Alberto Vomiero; Elisa Moretti. Ceria doping boosts methylene blue photodegradation in titania nanostructures. Materials Chemistry Frontiers 2021, 5, 4138 -4152.

AMA Style

Chiara Alberoni, Isabel Barroso-Martín, Antonia Infantes-Molina, Enrique Rodríguez-Castellón, Aldo Talon, Haiguang Zhao, Shujie You, Alberto Vomiero, Elisa Moretti. Ceria doping boosts methylene blue photodegradation in titania nanostructures. Materials Chemistry Frontiers. 2021; 5 (11):4138-4152.

Chicago/Turabian Style

Chiara Alberoni; Isabel Barroso-Martín; Antonia Infantes-Molina; Enrique Rodríguez-Castellón; Aldo Talon; Haiguang Zhao; Shujie You; Alberto Vomiero; Elisa Moretti. 2021. "Ceria doping boosts methylene blue photodegradation in titania nanostructures." Materials Chemistry Frontiers 5, no. 11: 4138-4152.

Journal article
Published: 26 March 2021 in Journal of Energy Chemistry
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Lithium–sulfur batteries have been recognised as highly promising next-generation batteries, due to their low cost and high theoretical energy density. Despite numerous advances in this technology over the last decade, its commercialisation is still a challenge that has not yet been achieved. Many efforts have been made to improve the problems that these batteries present, mainly by investigating different cathode manufacturing strategies, testing novel Li anodes, new additives in the electrolytes, and modified separators or interlayers. However, the characteristics of the current collectors used in the preparation of the electrodes have been rarely addressed. Three commercial collectors are commonly used in basic research on Li–S batteries: Al foil, carbon coated Al foil (Al-C), and carbon paper (gas diffusion layer, GDL). In this work, a detailed study of the electrochemical response of these commercial collectors has been carried out. The tests were carried out on two S composites formed by carbons of a different natures, commercial carbon black and synthetic N-doped graphene. In addition, the S impregnation method was different, using either melt diffusion at 155 °C or ethylenediamine as S solvent, respectively. In both systems, the results were similar – the electrodes supported on GDL delivered higher specific capacities than those supported on Al and Al-C, with minimal differences between the two. Of the different collector properties examined to explain this behaviour, namely Al corrosion, electrical conductivities, surface-level composition, and surface texture, only the latter had a significant effect in the performance of GDL-based electrodes. SEM images revealed a rough and cracked surface formed by the agglomerated carbon particles that give rise to a complex pore system, predominantly consisting of macropores. All of these features are beneficial for a better anchoring of the active material on the collector surface, in addition to enhancing the wettability of the electrolyte and favouring reaction kinetics. In contrast, the Al-based collector possesses a very smooth and non-porous surface, detrimental to both the active material-substrate interface and the active material impregnation by the electrolyte.

ACS Style

A. Benítez; F. Luna-Lama; A. Caballero; E. Rodríguez-Castellón; J. Morales. Contribution to the understanding of the performance differences between commercial current collectors in Li–S batteries. Journal of Energy Chemistry 2021, 62, 295 -306.

AMA Style

A. Benítez, F. Luna-Lama, A. Caballero, E. Rodríguez-Castellón, J. Morales. Contribution to the understanding of the performance differences between commercial current collectors in Li–S batteries. Journal of Energy Chemistry. 2021; 62 ():295-306.

Chicago/Turabian Style

A. Benítez; F. Luna-Lama; A. Caballero; E. Rodríguez-Castellón; J. Morales. 2021. "Contribution to the understanding of the performance differences between commercial current collectors in Li–S batteries." Journal of Energy Chemistry 62, no. : 295-306.

Research article
Published: 24 February 2021 in Industrial & Engineering Chemistry Research
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CO2 methanation structured catalysts, made by a layer of Ru–CeO2 or Ni–CeO2 (Ru/Ce = 3/97; Ni/Ce = 1/3 and 3/1) on open-cell NiCrAl foams, are prepared by electrodeposition and a subsequent calcination step. The performance of the catalysts at a space velocity of 320,000 mL gcat–1 h–1 in a feedstock with H2/CO2/N2 = 4/1/1 v/v, significantly depends on the Ni content and the preparation method. A low Ru or Ni content promotes the metal–CeO2 interaction, the formation of defects in CeO2 as well as the development of a lower amount of cracks in the coating; however, the catalysts show a poor CO2 conversion and selectivity to CH4. The CH4 production rate at low temperature largely increases for the high Ni loaded catalyst, 68.7 LCH4 gNi–1 h–1 at 350 °C oven temperature. This productivity is similar to the value obtained with a Ni3Ce1 pellet catalyst prepared by the coprecipitation method, a behavior not achievable for low Ru- and Ni-loaded catalysts.

ACS Style

Phuoc Hoang Ho; Giancosimo Sanghez de Luna; Arturo Poggi; Monica Nota; Enrique Rodríguez-Castellón; Giuseppe Fornasari; Angelo Vaccari; Patricia Benito. Ru–CeO2 and Ni–CeO2 Coated on Open-Cell Metallic Foams by Electrodeposition for the CO2 Methanation. Industrial & Engineering Chemistry Research 2021, 60, 6730 -6741.

AMA Style

Phuoc Hoang Ho, Giancosimo Sanghez de Luna, Arturo Poggi, Monica Nota, Enrique Rodríguez-Castellón, Giuseppe Fornasari, Angelo Vaccari, Patricia Benito. Ru–CeO2 and Ni–CeO2 Coated on Open-Cell Metallic Foams by Electrodeposition for the CO2 Methanation. Industrial & Engineering Chemistry Research. 2021; 60 (18):6730-6741.

Chicago/Turabian Style

Phuoc Hoang Ho; Giancosimo Sanghez de Luna; Arturo Poggi; Monica Nota; Enrique Rodríguez-Castellón; Giuseppe Fornasari; Angelo Vaccari; Patricia Benito. 2021. "Ru–CeO2 and Ni–CeO2 Coated on Open-Cell Metallic Foams by Electrodeposition for the CO2 Methanation." Industrial & Engineering Chemistry Research 60, no. 18: 6730-6741.

Journal article
Published: 30 January 2021 in Materials
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Manganese-substituted 5 mol.% yttria-stabilized zirconia (5YSZ) was explored as a prospective material for protective interlayers between electrolyte and oxygen electrodes in reversible solid oxide fuel/electrolysis cells. [(ZrO2)0.95(Y2O3)0.05]1−x [MnO y ] x (x = 0.05, 0.10 and 0.15) ceramics with cubic fluorite structure were sintered in air at 1600 °C. The characterization included X-ray diffraction (XRD), scanning electron microscopy (SEM)/energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), thermogravimetry and dilatometry in controlled atmospheres, electrical conductivity measurements, and determination of oxygen-ion transference numbers by the electromotive force (EMF) technique. Mn-substituted 5YSZ solid solutions exhibit variable oxygen nonstoichiometry with manganese cations in a mixed 2+/3+ oxidation state under oxidizing conditions. Substitution by manganese gradually increases the extent of oxygen content variation on thermal/redox cycling, chemical contribution to thermal expansion and dimensional changes on reduction. It also deteriorates oxygen-ionic conductivity and improves p-type electronic conductivity under oxidizing conditions, leading to a gradual transformation from predominantly ionic to prevailing electronic transport with increasing x. Mn2+/3+→Mn2+ transformation under reducing atmospheres is accompanied by the suppression of electronic transport and an increase in ionic conductivity. All Mn-substituted 5YSZ ceramics are solid electrolytes under reducing conditions. Prolonged treatments in reducing atmospheres, however, promote microstructural changes at the surface of bulk ceramics and Mn exsolution. Mn-substituted 5YSZ with 0.05 ≤ x < 0.10 is considered the most suitable for the interlayer application, due to the best combination of relevant factors, including oxygen content variations, levels of ionic/electronic conductivity and thermochemical expansion.

ACS Style

Alejandro Natoli; Blanca Arias-Serrano; Enrique Rodríguez-Castellón; Agnieszka Żurawska; Jorge Frade; Aleksey. Yaremchenko. Mixed Ionic-Electronic Conductivity, Redox Behavior and Thermochemical Expansion of Mn-Substituted 5YSZ as an Interlayer Material for Reversible Solid Oxide Cells. Materials 2021, 14, 641 .

AMA Style

Alejandro Natoli, Blanca Arias-Serrano, Enrique Rodríguez-Castellón, Agnieszka Żurawska, Jorge Frade, Aleksey. Yaremchenko. Mixed Ionic-Electronic Conductivity, Redox Behavior and Thermochemical Expansion of Mn-Substituted 5YSZ as an Interlayer Material for Reversible Solid Oxide Cells. Materials. 2021; 14 (3):641.

Chicago/Turabian Style

Alejandro Natoli; Blanca Arias-Serrano; Enrique Rodríguez-Castellón; Agnieszka Żurawska; Jorge Frade; Aleksey. Yaremchenko. 2021. "Mixed Ionic-Electronic Conductivity, Redox Behavior and Thermochemical Expansion of Mn-Substituted 5YSZ as an Interlayer Material for Reversible Solid Oxide Cells." Materials 14, no. 3: 641.

Journal article
Published: 27 January 2021 in Molecular Catalysis
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Heteroatomic dual-doped metal free graphene materials have revealed significant improvement in the electrocatalysis properties for oxygen reduction reaction (ORR) in alkaline anion exchange membrane fuel cells. Here we report a straightforward and cost-effective strategy to fabricate N, S- and N, P- dual-doped reduced graphene oxide electrocatalysts, characterized by similar N/S and N/P ratios. For this purpose, we used ammonium sulfate ((NH4)2SO4) and ammonium monohydrogenphosphate ((NH4)2HPO4) as heteroatom precursors to obtain the desired catalysts by pyrolysis with graphene oxide. Systematic characterization reveals that the secondary heteroatom S has a greater promotional effect than P in ORR. Furthermore, the gap between the onset potentials of N, S- dual-doped graphene and the standard Pt/C is only 30 mV. The results imply that the combination of the N, S heteroatoms and the surface structure in dual-doped reduced graphene oxide lead to a synergistic effect in catalyzing ORR in alkaline media.

ACS Style

Zahra Moosapour Siahkalroudi; Behzad Aghabarari; Mohammadreza Vaezi; Enrique Rodríguez-Castellón; María Victoria Martínez-Huerta. Effect of secondary heteroatom (S, P) in N-doped reduced graphene oxide catalysts to oxygen reduction reaction. Molecular Catalysis 2021, 502, 111372 .

AMA Style

Zahra Moosapour Siahkalroudi, Behzad Aghabarari, Mohammadreza Vaezi, Enrique Rodríguez-Castellón, María Victoria Martínez-Huerta. Effect of secondary heteroatom (S, P) in N-doped reduced graphene oxide catalysts to oxygen reduction reaction. Molecular Catalysis. 2021; 502 ():111372.

Chicago/Turabian Style

Zahra Moosapour Siahkalroudi; Behzad Aghabarari; Mohammadreza Vaezi; Enrique Rodríguez-Castellón; María Victoria Martínez-Huerta. 2021. "Effect of secondary heteroatom (S, P) in N-doped reduced graphene oxide catalysts to oxygen reduction reaction." Molecular Catalysis 502, no. : 111372.

Research article
Published: 20 January 2021 in ACS Sustainable Chemistry & Engineering
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This paper reports on a systematic study on the catalytic gas-phase synthesis of methyl methacrylate (MMA) by means of the hydroxymethylation and dehydration of methyl propionate (MP) with formaldehyde (FAL), the latter being produced in situ by methanol (MeOH) dehydrogenation. This represents a promising variant of the current industrial Alpha process in which pure FAL is fed, alongside MP, into a gas-phase fixed-bed reactor filled with a supported Cs2O catalyst. In this way, an alternative process avoiding the need to feed carcinogenic FAL has been developed by feeding MeOH vapors onto a catalyst with dehydrogenating properties. For this purpose, an innovative Ga oxide-based bifunctional catalytic system is herein described for the first time for this peculiar application. Its catalytic performance and its chemical–physical features were investigated and evaluated to explain structure–activity relationships. Side reactions, MP ketonization, and MMA hydrogenation via H-transfer were accelerated in the presence of strong basic sites. The commercial, low-surface-area β-Ga2O3 catalyst showed a strong dehydrogenating activity and the highest selectivity toward MMA due to its weak basicity. However, deactivation was observed due to (i) the deposition of carbonaceous species onto surface acidic sites, as evidenced by means of X-ray photoelectron spectroscopy (XPS) analysis, and (ii) the loss of specific surface area. On the other hand, Ga3+ could be easily incorporated into MgO by means of a simple co-precipitation technique, leading to Mg/Ga mixed oxides with a high specific surface area. When relatively small amounts of Ga3+ were used (e.g., in a Mg/Ga mixed oxide with the Mg/Ga atomic ratio = 10), the catalyst was much more active in MeOH dehydrogenation with respect to pure MgO. Moreover, the presence of Ga3+ ions reduced the density and strength of the basic sites while increasing the selectivity toward MMA by decreasing the occurrence of the H-transfer and ketonization reactions, which, conversely, readily occurred on highly basic MgO. On the other hand, the Mg/Ga mixed oxide with Mg/Ga = 10 showed a weaker acidity compared to β-Ga2O3 and better stability due to limited coking. These results have shown both the potential and limitations of this alternative strategy. In particular, a more selective transformation of methanol to MMA needs to be achieved to allow the applicability of the proposed strategy on a bigger scale. Therefore, future efforts will be devoted to catalyst and condition optimization, also with the aim of limiting methanol unselective decomposition reactions.

ACS Style

Jacopo De Maron; Martina Eberle; Fabrizio Cavani; Francesco Basile; Nikolaos Dimitratos; Pedro J. Maireles-Torres; Enrique Rodriguez-Castellón; Tommaso Tabanelli. Continuous-Flow Methyl Methacrylate Synthesis over Gallium-Based Bifunctional Catalysts. ACS Sustainable Chemistry & Engineering 2021, 9, 1790 -1803.

AMA Style

Jacopo De Maron, Martina Eberle, Fabrizio Cavani, Francesco Basile, Nikolaos Dimitratos, Pedro J. Maireles-Torres, Enrique Rodriguez-Castellón, Tommaso Tabanelli. Continuous-Flow Methyl Methacrylate Synthesis over Gallium-Based Bifunctional Catalysts. ACS Sustainable Chemistry & Engineering. 2021; 9 (4):1790-1803.

Chicago/Turabian Style

Jacopo De Maron; Martina Eberle; Fabrizio Cavani; Francesco Basile; Nikolaos Dimitratos; Pedro J. Maireles-Torres; Enrique Rodriguez-Castellón; Tommaso Tabanelli. 2021. "Continuous-Flow Methyl Methacrylate Synthesis over Gallium-Based Bifunctional Catalysts." ACS Sustainable Chemistry & Engineering 9, no. 4: 1790-1803.

Paper
Published: 11 December 2020 in Sustainable Energy & Fuels
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Microwave and ultrasound preparation of highly active OER electrodes derived from pinecones and having a low cobalt content is reported.

ACS Style

Alessio Zuliani; Manuel Cano; Federica Calsolaro; Alain R. Puente Santiago; Juan J. Giner-Casares; Enrique Rodríguez-Castellón; Gloria Berlier; Giancarlo Cravotto; Katia Martina; Rafael Luque. Improving the electrocatalytic performance of sustainable Co/carbon materials for the oxygen evolution reaction by ultrasound and microwave assisted synthesis. Sustainable Energy & Fuels 2020, 5, 720 -731.

AMA Style

Alessio Zuliani, Manuel Cano, Federica Calsolaro, Alain R. Puente Santiago, Juan J. Giner-Casares, Enrique Rodríguez-Castellón, Gloria Berlier, Giancarlo Cravotto, Katia Martina, Rafael Luque. Improving the electrocatalytic performance of sustainable Co/carbon materials for the oxygen evolution reaction by ultrasound and microwave assisted synthesis. Sustainable Energy & Fuels. 2020; 5 (3):720-731.

Chicago/Turabian Style

Alessio Zuliani; Manuel Cano; Federica Calsolaro; Alain R. Puente Santiago; Juan J. Giner-Casares; Enrique Rodríguez-Castellón; Gloria Berlier; Giancarlo Cravotto; Katia Martina; Rafael Luque. 2020. "Improving the electrocatalytic performance of sustainable Co/carbon materials for the oxygen evolution reaction by ultrasound and microwave assisted synthesis." Sustainable Energy & Fuels 5, no. 3: 720-731.

Original research article
Published: 16 November 2020 in Frontiers in Chemistry
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A wide variety of solid sorbents has recently been synthesized for application in CO2 adsorption. Among them, mesoporous silicas deserve attention because of their ability to accommodate large concentrations of different chemicals as a consequence of their surface chemistry and tunable pore structure. Functionalized materials exhibit promising features for CO2 adsorption at high temperatures and low CO2 concentrations. This work aimed to assess the influence of the textural properties on the performance of CO2 adsorption on functionalized mesoporous silica. With this goal, several mesoporous silica foams were synthesized by varying the aging temperature, obtaining materials with larger pore diameter. Thus, the synthesized materials were functionalized by grafting or impregnation with 3-aminopropyltriethoxysilane, polyethylenimine, and tetraethylenepentamine as amine sources. Finally, the amino functionalized materials were assessed for CO2 capture by means of equilibrium adsorption isotherms at 25, 45, and 65°C. Among the most outstanding results, high aging temperatures favor the performance of impregnated materials by exposing greater pore diameters. Low or intermediate temperatures favor grafting by preserving an appropriate density of silanol groups.

ACS Style

Enrique Vilarrasa-García; Juan Antonio Cecilia; Pedro Augusto S. Moura; Diana C. S. Azevedo; Enrique Rodríguez-Castellón. Assessing CO2 Adsorption on Amino-Functionalized Mesocellular Foams Synthesized at Different Aging Temperatures. Frontiers in Chemistry 2020, 8, 1 .

AMA Style

Enrique Vilarrasa-García, Juan Antonio Cecilia, Pedro Augusto S. Moura, Diana C. S. Azevedo, Enrique Rodríguez-Castellón. Assessing CO2 Adsorption on Amino-Functionalized Mesocellular Foams Synthesized at Different Aging Temperatures. Frontiers in Chemistry. 2020; 8 ():1.

Chicago/Turabian Style

Enrique Vilarrasa-García; Juan Antonio Cecilia; Pedro Augusto S. Moura; Diana C. S. Azevedo; Enrique Rodríguez-Castellón. 2020. "Assessing CO2 Adsorption on Amino-Functionalized Mesocellular Foams Synthesized at Different Aging Temperatures." Frontiers in Chemistry 8, no. : 1.