Sonia Aguado

University of Alcalá | UAH · Ingeneria Quimica

Surface biofilm inhibition is still currently a considerable challenge. Among other organisms, Staphylococcus aureus is notable for its ability to form a strong biofilm with proved resistance to chemotherapy. Contamination of high-touch surfaces with S. aureus biofilm not only promotes disease spread but also generates tremendous health-associated...

Reducing human impacts on drinking water is one of the main challenges for the water treatment industry. This work provides new results to support the recycling of EoL desalination reverse osmosis (RO) membranes for Membranes Biofilm Reactors (MBfRs). We investigate if the controlled-removal of fouling and polyamide layer may favor the use of these...

Zeolitic Imidazolate Framework ZIF-93 was synthesized from a stoichiometric mixture of metal-ligand in aqueous solutions at room temperature, yielding 80% of pure product. The characterization of the material confirmed the formation a material having the same properties to the one obtained previously by solvothermal method in DMF route. This method...

In the present study, the biocidal activity of three different metal organic frameworks (MOFs) based on Co (Co-SIM1), Zn (Zn-SIM1) and Ag (Ag-TAZ) has been evaluated towards one green alga and two cyanobacteria. These organisms are present in fresh- and seawater and take part in the early stages of the biofouling process. The biocidal activity of t...

A Zn based Metal Organic Framework with hydrazinebenzoate linkers was evaluated as antimicrobial material against the Gram-positive bacterium Staphylococcus aureus. The material allowed inhibiting bacterial growth and metabolic activity with median effect value about 20 mg/L dispersed in culture medium. The antimicrobial effect could be attributed...

The substituted imidazolate-based MOF (SIM-1) forms easily a homogeneous layer at the surface of millimetric platinum-loaded alumina beads. This new core-shell SIM-1@Pt/Al2O3 catalyst shows fine molecular sieving effect for the Pt-catalyzed hydrogenation of carbon-carbon double bonds.

We report the supercell crystal structure of a ZIF‐8 analog substituted imidazolate metal–organic framework (SIM‐1) obtained by combining solid‐state nuclear magnetic resonance and powder X‐ray diffraction experiments with density functional theory calculations. The superstructure of a substituted zeolitic imidazolate metal–organic framework was de...

We report the supercell crystal structure of a ZIF-8 analog substituted imidazolate metal–organic framework (SIM-1) obtained by combining solid-state nuclear magnetic resonance and powder X-ray diffraction experiments with density functional theory calculations.

The objective of this paper is to present a new class of polylactic acid (PLA) fibers containing cobalt-based metal organic frameworks (MOF). The material used was Co-SIM-1, a cobalt-based substituted imidazolate. Composite mats were prepared by electrospinning PLA with a suspension of polyvinylpyrrolidone-stabilized Co-SIM-1. MOF particles formed...

Two cobalt imidazolate metal–organic frameworks were evaluated as a bactericidal material against the growt h of the Gram-negative bacteria Pseudomonas putida and Escherichia coli. Under the most unfavourable conditions, within the exponential growth phase and in the culture media for both microorganisms, the growth inhibition reached over 50% for...

We report two new microporous mixed-metals triazolate based MOFs made from zinc and nickel salts combined with either 1,2,4-triazole or 3,5-diamino-1,2,4-triazole. Their structures, refined from X-ray powder diffraction, their CO2 adsorption and photoluminescent properties show a direct correlation with the structure of their parent organic ligand.

A novel concept that employs dual chamber SOFC technology with a porous electrolyte, which allows the controlled distribution of gaseous O2 at the anode side, was successfully designed using an all porous structure. The oxidative reforming of hydrocarbon streams can consequently operate in a similar fashion to single chamber SOFCs, but within a saf...

We investigate the influence of the aluminium content on the adsorption of hexane isomers at 293 K on MFI type zeolites (Si/Al ratios – SAR of 25, 100 and ∞). Adsorption isotherms were assessed with a homemade volumetric system. Temporal up-take curves were recorded using a manometric set-up combined with a Rubotherm suspension balance. All three i...

The one-pot post-functionalization allows anchoring a molecular nickel complex into a mesoporous metal-organic framework (Ni@(Fe)MIL-101). It is generating a very active and reusable catalyst for the liquid-phase ethylene dimerization to selectively form 1-butene. Higher selectivity for 1-butene is found using the Ni@(Fe)MIL-101 catalyst than repor...

International @ INGENIERIE+JEC:YSC:DFA

International @ INGENIERIE+JEC:DFA

Absolute ethylene/ethane separation is achieved by ethane exclusion on silver-exchanged zeolite A adsorbent. This molecular sieving type separation is attributed to the pore size of the adsorbent, which falls between ethylene and ethane kinetic diameters.

International @ INGENIERIE+JEC:DFA

Very sophisticated porous materials known as multivariate functional MOFs (also known as MixMOFs) can be designed using a synthesis method that starts from solutions composed of two or more different linkers. For this procedure to be successful, one must have access to techniques that characterize the homogeneity of MOF crystallites containing two...

This work presents the synthesis of MIL-53(Al) metal–organic frameworks with different terephthalate/2-aminoterephthalate linker ratios incorporated into the framework during hydrothermal synthesis. In all cases, the materials show prominent S-shaped isotherms upon CO2 adsorption that can be attributed to sorbate-induced breathing phenomena involvi...

Polyethylenimine (PEI) has been grafted on a 2D hexagonal mesostructured porous silica of MCM-41 type (LUS silica) using 3-glycidoxypropyltrimethoxysilane (GTMS) as a grafting agent to develop sorbents for CO2 capture. The advantage of this tether is to create ethanolamine units upon reaction of the epoxy group with the amine functions of PEI. Two...

Polyethylenimine (PEI) has been grafted on a 2D hexagonal mesostructured porous silica of MCM-41 type (LUS silica) using 3-glycidoxypropyltrimethoxysilane (GTMS) as a grafting agent to develop sorbents for CO2 capture. The advantage of this tether is to create ethanolamine units upon reaction of the epoxy group with the amine functions of PEI. Two...

A matter of minutes: Dynamic nuclear polarization (DNP) is applied to enhance the signal of solid-state NMR spectra of metal-organic framework (MOF) materials. The signal enhancement enables the acquisition of high-quality 1D 13C solid-state NMR spectra, 2D 1H- 13C dipolar HETCOR and 1D 15N solid-state NMR spectra with natural isotopic abundance in...

Continuous thin zeolite NaA films have been synthesized on macroporous α-alumina supports subjected to a simple pretreatment and without seeding. By modifying the supports with a cationic polymer and even with glucose or polyethylene glycol and subsequent calcination at 673K, a substantial improvement in terms of layer continuity and crystal interg...

In this work, we report a quantitative structure-activity relationship of functionalized ZIF-type materials (SIM, Substituted Imidazolate Material). Keeping the catalytic center unmodified, post-synthetic modification allows an efficient control of the hydrophilic–hydrophobic balance which drives the competitive adsorption of reactants and products...

Covalent post-synthetic modification of a MOF, (In) MIL-68-NH(2), is carried out in a novel fashion to immobilize amino acids within the structure. Solid-phase peptide coupling methodology opens new perspectives for anchoring chiral bio- and catalytically active species. This could facilitate the immobilization of highly active and/or coordinating...

Combinatorial screening using precipitation methods at room temperature can lead to a great diversity of carboxylate based Metal Organic Frameworks (MOFs) including already known or original porous solids. The investigation of the synthesis of MOFs in different solvent and solvent mixtures includes the use of solvents such as alcohols and tetrahydr...

This study deals with the enhancement of CO2 uptake by ligand functionalization of zeolitic imidazolate framework (ZIF) materials. The ligand dipole moment could be considered as one of the main criteria for CO2 adsorption enhancement. To verify this hypothesis, an experimental–computational study was performed on an isoreticular ZIF series with so...

Here, we present for the first time the combination of the postfunctionalization of a MOF with its shaping as structured bodies. This study deals with the porous zinc carboxylimidazolate material known as SIM-1. A great advantage of this method is that the aldehyde moieties present on the structure walls allow organic modifications in the solid sta...

4 Canivet, Jerome Aguado, Sonia Daniel, Cecile Farrusseng, David

The zinc benzimidazolate coordination polymer (ZIF-7) shows a reversible gate-opening effect upon variation of partial pressure of CO2 or temperature. This phenomenon, which is unique for a MOF with sodalite topology, arises from a phase-to-phase transformation upon guest adsorption–desorption.

A substituted imidazolate-based MOF (SIM-1) membrane has been crystallized in situ on a tubular asymmetric alumina support that can be exploited for gas separation through preferential adsorption.

A substituted imidazolate-based MOF (SIM-1), easily shaped in situ on and in millimetre-sized alumina beads, is useful for catalytic applications and undergoes no modification of its intrinsic properties.

For economic and environmental reasons, there is a strong incentive to replace of homogeneous by green and efficient heterogeneous processes in catalysis. The Friedel-Crafts alkylation of aromatics is a marking example. Numbers of homogeneous catalysts (such as HF, H2SO3, and AlCl3) have been replaced by H-form zeolites. However, large pore zeolite...

The preparation of α-alumina supported zeolite Beta membranes was successfully achieved and sped up by exploring combinations of three seeding techniques and three synthetic methods. The surface of the membranes was completely covered by well intergrown crystals; the thickness of the zeolite layers ranged from 2 to 6μm depending on the synthesis me...

The paper addresses current needs in Natural Gas (NG) treating. Basic principles of Pressure Swing Adsorption (PSA) separation processes are described. A state of the art of microporous adsorbents in the frame of NG treating is given. It includes reference and advanced zeolites, carbon based materials and Metal-Organic Frameworks (MOFs). The pros a...

Metal-Organic Frameworks (post-)functionalised with nitrogen containing moieties undergo solvent free aza-Michael condensation and transesterification, surpassing molecular and functionalised MCM-type analogues.

Die Vorzüge und Einschränkungen von Metall-organischen Gerüsten (MOFs) auf dem Gebiet der Katalyse und der “grünen Chemie” bilden das Thema dieses Kurzaufsatzes. Struktur und Dynamik der MOFs werden im Zusammenhang katalytischer Funktionen betrachtet, und es wird diskutiert, wie durch das Design solcher Materialien die Lücke zwischen Zeolithen und...

The role of metal-organic frameworks (MOFs) in the field of catalysis is discussed, and special focus is placed on their assets and limits in light of current challenges in catalysis and green chemistry. Their structural and dynamic features are presented in terms of catalytic functions along with how MOFs can be designed to bridge the gap between...

The preparation of b-oriented MFI films from porous silica layers was investigated and optimized. The alumina supported silica membranes were immersed in a concentrated TPAOH solution. Finally b-oriented and well-intergrown MFI crystal films were produced by carrying out an in situ hydrothermal synthesis using a synthesis solution 1 SiO2:0.05 TPAOH...

Zeolite NaA membranes were obtained by using a continuous recirculating flow, 0.25–5mlmin−1 of synthesis solution along the inner side of asymmetric porous alumina tubular supports. The membranes of 5μm in thickness showed a N2 permeance of 5×10−7–1×10−6m−2s−1Pa−1. The procedure developed in this work provides control of the synthesis and crystalli...

By a seeding approach coatings of copper benzene tricarboxylate (Cu3(BTC)2, also known as HKUST-1) are obtained on α-alumina. The obtained crystal densities, order and intergrowth improve the best results reported up to now in the literature for any metal-organic framework material. The effect of synthesis conditions on the morphology and crystal s...

ZSM-5 membranes prepared by liquid phase hydrothermal synthesis on tubular commercial supports and subsequently ion-exchanged with Pt were used in a membrane reactor for the combustion of n-hexane present at low concentrations in air. The investigation deals mainly with the relationship between the permeation properties of the membrane and the perf...

MFI-type zeolite membranes prepared by liquid phase hydrothermal synthesis on tubular commercial supports were used to remove model pollutants n-hexane, formaldehyde and benzene present at very low concentration levels (2–230ppmv) in indoor air. The influence of several operating parameters was studied both in batch and continuous separation experi...

First results showing

El problema de la contaminación del interior de edificios se debe a la presencia de, entre otras sustancias, compuestos orgánicos volátiles (COVs). Estos compuesto se generan o bien en los propios edificios con el uso de productos de oficina o bien proceden del exterior. Aunque este problema éste bien diagnosticado, su solución dista de ser única y...