Gemma Turnes Palomino

Gemma Turnes Palomino
University of the Balearic Islands | UIB · Department of Chemistry

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132
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Publications

Publications (132)
Article
Storing highly concentrated reagents and releasing them with high efficiency is crucial for developing highly sensitive biosensors. However, the performance of reservoirs in biosensors made of filter paper is limited by the intrinsic physicochemical properties of untreated cellulose. In this article, the impact of 9 different polymer modifications...
Article
Long-chain fatty acids (LCFA) are commonly found in lipid-rich wastewaters and are a key factor to monitor the anaerobic digesters. A new simple, fast, precise, and suitable method for routine analysis of LCFA is proposed. The system involves in-syringe-magnetic stirring-assisted dispersive liquid-liquid microextraction (DLLME) prior to gas chromat...
Article
The photocatalytic activity of mixed oxide α-Fe2O3/TiO2 doped with P (αFe-Ti/P) was evaluated on diuron degradation in aqueous solution and NOx oxidation under UV and visible light irradiation. The microwave-assisted sol-gel route was used to prepare the αFe-Ti/P catalyst. The TiO2 doped with P (Ti/P), α-Fe2O3/TiO2 (αFe-Ti) and TiO2 (Ti) were also...
Article
High hydrophobic and oleophilic hybrid porous sponges were prepared by coating low cost commercial melamine-formaldehyde sponges with a metal-organic framework (MOF) derived porous carbon. A mesoporous metal-organic framework MIL-100(Fe), obtained under mild conditions, was used as precursor material to obtain highly porous carbon, which was incorp...
Article
A solid-phase extraction methodology using a MIL-101(Fe)/PVDF membrane was proposed as a useful alternative for the simultaneous determination of naproxen, diclofenac, and ibuprofen, three anti-inflammatory drugs (NSAIDs), in wastewater samples by HPLC-CCD analysis. The MIL-101(Fe) was prepared by a rapid microwave-assisted method and supported in...
Article
In this work, the dispersive solid-phase extraction of sulfonamide antibiotics was evaluated using magnetic porous carbon derived from cobalt (II)-based metal-organic frameworks. By direct carbonization under inert atmosphere of Co-SIM-1, Co-MOF-74 and Co-DABCO MOFs, different magnetic porous carbons were prepared and characterized to study their s...
Article
Phosphorous-doped Ti-Fe mixed oxide (P-TiO2-αFe2O3) catalysts were prepared by the microwave-assisted sol-gel route and characterized using XRD, SEM, N2 physisorption, UV-Vis diffuse reflectance, FTIR, and XPS. P-TiO2-αFe2O3 was evaluated during the degradation of a sulfonamide mixture (5 mg/L, each) under visible light. The photocatalytic process...
Article
The preparation of a hybrid magnetic [email protected] from a MOF-derived porous carbon is reported. MOF-74(Co) is used as a precursor for the synthesis of a magnetic carbon with homogeneous cobalt particles distribution (C-MOF-74) by a direct carbonization step. The cobalt particles present in the carbon are partially converted to ZIF-67 by reacti...
Article
Protonic gallosilicates H-[Ga]-ZSM-5 were synthesized, following a hydrothermal procedure, from gels having Si/Ga ratios of 25, 50 and 75. Likewise, for comparison, protonic zeolites H-[Al]-ZSM-5 having Si/Al ratios of 25 and 50 were also prepared. Brønsted acidity of the structural Si(OH)Ga groups in the gallosilicates was studied by means of IR s...
Article
Strategies to incorporate porous coatings on 3D printed devices with intricate geometries are critical to expanding the scope of application of this type of manufacturing technique. Herein, the preparation of metal–organic framework (MOF)/polymer dispersions to be applied as coatings for 3D printed devices is described. As a proof of concept, submi...
Article
Porous carbon derived from amine-functionalized MIL-125 metal-organic framework (C-MIL-125-NH2) was prepared by carbonization at high temperature under inert atmosphere, and used for adsorption of bisphenol A (BPA) and 4-tert-butylphenol (4-tBP). The obtained carbon showed bimodal porosity and fast extraction of both pollutants in batch conditions...
Article
Full-text available
Metal–organic frameworks (MOFs) are porous crystalline materials with large surface areas, uniform pore size, and tunable selectivity. In the last few years, the number of analytical applications of MOFs has been growing constantly. However, the direct use of as-synthesized MOFs in packed column format is rather limited for analytical separations b...
Article
The adsorption capacities of a novel amorphous silica, and silica xerogels, for aromatic compounds were investigated under batch conditions and using Micro Column Rapid Breakthrough tests coupled with Sequential Injection Flow-based automated instrumentation, in order to evaluate their operative feasibility under conditions typically used in water...
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Full-text available
A fully automated on-line system for monitoring the TiO2-based photocatalytic degradation of dimethyl phthalate (DMP) and diethyl phthalate (DEP) using sequential injection analysis (SIA) coupled to liquid chromatography (LC) with UV detection was proposed. The effects of the type of catalyst (sol-gel, Degussa P25 and Hombikat), the amount of catal...
Cover Page
Hierarchically porous carbon sponges (HCS) have been prepared from ZnO@ZIF‐8 porous crystal precursors. HCS have been implemented in membrane format for the fast and efficient extraction of toxic phthalate esters from water. For more details, see the Full Paper by J. L. Guzmán‐Mar, F. Maya et al. on page 13450 ff.
Article
A method for the analysis of phthalic acid esters or phthalates (PAEs) in polyethylene terephthalate (PET) bottles based on the use of microwave-assisted extraction (MAE) and liquid chromatography with UV detection (LC-UV) was developed. The microwave-assisted extraction procedure was optimized by a three factors Box–Behnken response surface design...
Article
We report the preparation of hierarchical porous carbon sponges (HCS) from metal oxide nanoparticle@metal‐organic frameworks. ZnO nanoparticles are partially converted to zeolitic imidazolate framework‐8 (ZIF‐8) crystals in presence of n‐butylamine, obtaining ZnO@ZIF‐8 porous hybrids. After direct carbonization, followed by ZnO acidic etching, ZnO@...
Article
Herein we report the use of the zirconium metal–organic framework (UiO-66) as precursor to prepare porous carbons by a direct carbonization step (carbon-ZrO2). By applying a post-carbonization acidic etching treatment with hydrofluoric acid (HF), the initial surface area of the carbon-ZrO2 sample increased from 270 m² g⁻¹ to 1550 m² g⁻¹ (carbon-ZrO...
Article
Full-text available
The application of layered double hydroxide-Al2O3-polymer mixed-matrix disks for solid-phase extraction is reported for the first time. Al2O3 is embedded in a polymer matrix followed by an in situ metal-exchange process to obtain a layered double hydroxide-Al2O3-mixed-matrix disk with excellent flow-through properties. The extraction performance of...
Article
This review provides an update on the implementation of emerging materials as sorbents for sample preparation in combination with chromatographic separation. We have focused on recent applications of metal–organic frameworks, layered double hydroxides, porous carbons obtained from polymers or biomass precursors, and silicates (clays and zeolites)....
Article
Cr³⁺-doped TiO2 nanoparticles (Ti-Cr) were synthesized by a simple and fast microwave assisted sol-gel method. Ti-Cr catalyst was characterized by X-ray diffraction (XRD), ultraviolet–visible diffuse reflectance spectroscopy (UV–Vis DRS), N2 adsorption–desorption analysis, Raman spectroscopy, scanning electron microscopy (SEM), transmission electro...
Article
Full-text available
Photocatalytic degradation of 4-chloro-2-methylphenoxyacetic acid (MCPA) in aqueous solution using Cr(III)-doped TiO2 under UV and visible light was investigated. The semiconductor material was synthesized by a microwave-assisted sol-gel method with Cr(III) doping contents of 0.02, 0.04, and 0.06 wt%. The catalyst was characterized using X-ray powd...
Article
Magnetic solid-phase extraction (MSPE) is a useful sample preparation technique, enabling the dispersion of solid sorbents in liquid sample matrices followed by the magnetic retrieval of the sorbent. MSPE can be implemented using any kind of magnetic materials independently of their size and shape, and is a powerful tool for the application of micr...
Article
Full-text available
In this study, the photocatalytic removal of an emerging contaminant, diclofenac (DCF) sodium, was performed using the nitrogen-doped WO3/TiO2-coupled oxide catalyst (WO3/TiO2-N). The catalyst synthesis was accomplished by a sol-gel method using tetrabutyl orthotitanate (C16H36O4Ti), ammonium p-tungstate [(NH4)10H2W12O42·4H2O] and ammonium nitrate...
Article
We present for the first time the application of metal-organic framework (MOF) mixed-matrix disks (MMD) for the automated flow-through solid-phase extraction (SPE) of environmental pollutants. Zirconium terephthalate UiO-66 and UiO-66-NH2 MOFs with different size (90, 200 and 300 nm) have been incorporated into mechanically stable polyvinylidene di...
Article
Full-text available
A two-step nanoparticle-directed route for the preparation of macroporous polymer monoliths which pore surface is covered with a metal-organic framework (MOF) coating has been developed to facilitate the use of MOFs in flow-based applications. The flow-through monolithic matrix was prepared in a column format from a polymerization mixture containin...
Article
Full-text available
Herein, we propose for the first time the use of magnetic porous carbons (MPCs) derived from zeolitic imidazolate frameworks (ZIFs) for the automated in-syringe magnetic dispersive micro-solid phase extraction (D-μ-SPE) of environmental pollutants prior to their analysis using GC-MS. MPCs with dual porosity are obtained from the direct combustion o...
Article
A series of metal organic frameworks-derived nanoporous carbons originating from zeolitic imidazolate framework-8 (ZIF-8) crystals as precursors have been prepared via varying the preparation conditions. The ZIF-8-derived carbons were subsequently admixed in the methacrylate monomers containing polymerization mixtures and polymerized to obtain mono...
Article
Full-text available
Dense and homogeneous metal-organic framework (MOF) coatings on functional bead surfaces are easily prepared by using intermediate sacrificial metal oxide coatings containing the metal precursor of the MOF. Polystyrene (PS) beads are coated with a ZnO layer to give ZnO@PS core-shell beads. The ZnO@PS beads are reactive in the presence of 2-methylim...
Article
We present the first application of submicrometric magnetic nanoporous carbons (µMNPC) as sorbents for automated solid-phase extraction (SPE). Small zeolitic imidazolate framework-67 crystals are obtained at room temperature, and directly carbonized under an inert atmosphere to obtain submicrometric nanoporous carbons containing magnetic cobalt nan...
Article
A novel automatic strategy for the use of micro- and nanomaterials as sorbents for dispersive micro-solid phase extraction (D-µ-SPE) based on the lab-in-syringe concept is reported. Using the developed technique, the implementation of magnetic metal-organic framework (MOF) materials for automatic solid-phase extraction has been achieved for the fir...
Article
Full-text available
We report on a facile and rapid microwave-assisted method for preparing a sodium-cadmium metal organic framework (having coordinatively unsaturated sodium ions) that considerably shortens the conventional synthesis time from 5 days to 1 hour. The obtained (Na,Cd)-MOF showed an excellent volumetric CO2 adsorption capacity (5.2 mmol cm-3 at 298 K and...
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A fully automated method for the controlled growth of metal-organic framework coatings on flow-through functional supports is reported. The obtained hybrid flow-through supports show high performance for the automated extraction of water pollutants.
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Development of advanced strategies for the extraction and preconcentration of trace levels of pollutants is essential for the quality control of water resources. A new procedure for the fast and highly efficient extraction of organic micropollutants from water using dispersions of zeolitc imidazolate framework-8 (ZIF-8) crystals in a mixture of sol...
Article
Full-text available
Amine-functionalized metal-organic frameworks, EN-MIL-100(Cr) and MMEN-MIL-100(Cr), were prepared by grafting ethylendiamine and N,N’-dimethylethylendiamine molecules, respectively, on coordinatively unsaturated chromium(III) cations in MIL-100 metal-organic frameworks. Although amine grafting results in a decrease of surface area and pore volume o...
Article
Interaction between carbon dioxide and the coordinatively unsaturated Cr(III), V(III) and Sc(III) cationic centers in MIL-100(Cr), MIL-100(V) and MIL-100(Sc), respectively, was studied by means of variable-temperature infrared (VTIR) spectroscopy, a technique that affords determination of standard adsorption enthalpy (Delta H-0) and entropy (Delta...
Article
Zeolites are often investigated as potential adsorbents for CO(2) adsorption and separation. Depending on the zeolite topology and composition (Si/Al ratio and extra-framework cations), the CO(2) adsorption heats at low coverages vary from -20 to -60 kJ mol(-1) , and with increasing surface coverage adsorption heats either stay approximately consta...
Article
The thermodynamics of hydrogen interaction with coordinatively unsaturated ScIII cationic sites in the metal organic framework MIL-100(Sc) was studied by variable temperature infrared spectroscopy. Simultaneous measurement of the hydrogen equilibrium pressure (inside a closed IR cell) and the integrated IR absorbance over the temperature range 80–1...
Article
The thermodynamics of hydrogen interaction with the coordinatively unsaturated CrIII cationic sites in the metal–organic frameworks MIL-100(Cr) and MIL-101(Cr) was studied by variable-temperature infrared (VTIR) spectroscopy. Simultaneous measurement of the equilibrium pressure of hydrogen and the integrated IR absorbance over the temperature range...
Cover Page
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The cover picture shows an allegoric representation of the dawning hopes of a hydrogen energy transition, which would alleviate the foreseeable shortage of fossil fuels for the transportation sector. Metal-organic frameworks (MOFs), represented by the honeycomb structure, have become a main focus in the current search for economically viable materi...
Article
Full-text available
Interaction between adsorbed hydrogen and the coordinatively unsaturated Mg(2+) and Co(2+) cationic centres in Mg-MOF-74 and Co-MOF-74, respectively, was studied by means of variable-temperature infrared (VTIR) spectroscopy. Perturbation of the H(2) molecule by the cationic adsorbing centre renders the H--H stretching mode IR-active at 4088 and 404...
Article
Adsorption of carbon monoxide, dinitrogen, and carbon dioxide on the porous metal−organic framework Mg-MOF-74 was investigated by means of a combined methodology comprising variable-temperature infrared spectroscopy and ab initio periodic DFT-D calculations using the CRYSTAL code. Both CO and N2 were found to form nearly linear (Mg2+···CO and Mg2+·...
Article
Hydrogen adsorption (physisorption) on the faujasite-type zeolite Mg–X was studied by means of variable-temperature (80–140K) FT-IR spectroscopy. Perturbation of the adsorbed H2 molecules by the cationic adsorbing centres of the zeolite renders the H–H stretching mode IR active, at 4065cm−1. Simultaneous measurement of IR absorbance and hydrogen eq...
Article
Adsorption of H(2) on the zeolite Ca-A was investigated by a combination of variable temperature IR spectroscopy and calculations at the periodic DFT level. Calculations showed that adsorption complexes can be formed on two types of adsorption sites: Ca(2+) in the center of six-member rings and Ca(2+) in eight-member rings. Only the former adsorpti...
Article
A combination of variable-temperature infrared spectroscopy with volumetric gas adsorption measurements was used to study the thermodynamics of hydrogen adsorption, at a low temperature, on calcium-exchanged zeolites X and Y. Two adsorption regimes were considered: (i) localized adsorption of dihydrogen molecules on Ca2+ cation sites, and (ii) delo...
Article
Variable-temperature infrared spectroscopy was used for a thermodynamic study on hydrogen adsorption on the zeolite Ca-Y. Adsorption renders the H–H stretching mode infrared active, at 4078 cm−1; and simultaneous measurement of IR absorbance and hydrogen equilibrium pressure, over a range of temperature, allowed standard adsorption enthalpy and ent...
Article
Full-text available
Carbon monoxide adsorption on Na-FER was studied by a combination of variable-temperature IR spectroscopy and computational methods involving, mainly, periodic density functional theory and ωCO/rCO correlation. Both, C–O stretching frequency and interaction energy of adsorption complexes were investigated. Interplay between calculated and experimen...
Article
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Des e ´chantillons de zéolites naturelles du Nord du Niger ont e ´té analysés par la diffraction des rayons X (DRX). Les résultats obtenus, complétés par ceux de la microscopie e ´lectronique a ` balayage (MEB) et de la microanalyse a ` la sonde EDAX, révèlent la présence d'analcime dans tous les e ´chantillons. De plus, les e ´chantillons contienn...
Article
Variable-temperature infrared spectroscopy was used for the thermodynamic studies on the adsorption of hydrogen on the zeolite (Mg,Na)-Y. Adsorption renders the HH stretching mode infrared active, and simultaneous measurement of IR absorbance and hydrogen equilibrium pressure, over a range of temperature, allowed adsorption enthalpy and entropy to...
Article
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Interaction of CO with K-FER zeolite was investigated by a combination of variable-temperature IR spectroscopy and computational study. Calculations were performed using omega(CO)/r(CO) correlation method in combination with a periodic density functional theory model. On the basis of agreement between experimental and calculated results, the follow...
Article
In this letter, the authors are reporting a time saving and cost-effective procedure to obtain tin-MCM-41 nanocomposites. This particular method simultaneously extracted the surfactant from MCM-41 and grafted the tin precursor creating Si–O–Sn–I bonds in the pore surface. The obtained solid reacted with K B H <sub>4</sub> , yielding tin containing...
Article
By means of variable-temperature FTIR spectroscopy, the standard adsorption enthalpy of hydrogen on the zeolite (Mg,Na)-Y was found to be ΔH° = −17.5 kJ mol−1, which suggests that magnesium-containing porous materials are good candidates in the search for suitable adsorbents for reversible hydrogen storage.
Article
Full-text available
The interaction, at a low temperature, between molecular hydrogen and the zeolite Li-FER was studied by means of variable temperature infrared spectroscopy and theoretical calculations using a periodic DFT model. The adsorbed dihydrogen molecule becomes infrared active, giving a characteristic IR absorption band (H-H stretching) at 4090 cm(-1). Thr...
Article
The interaction between molecular hydrogen and the alkali-metal-exchanged zeolites Na-FER and K-FER at a low temperature was investigated by combining variable-temperature infrared spectroscopy and theoretical calculations by using a periodic DFT model. The experimentally determined values of standard adsorption enthalpy, DeltaH degrees , were -6.0...
Article
Mesoporous iron phosphate containing CTAB as templating agent was synthesized and characterized by means of X-ray diffraction, Fourier transform infrared spectroscopy and TGA techniques. The mesoporous material shows a highly ordered structure, that collapses when submitted to extraction with acetate ions. The treatment of the exchanged samples at...
Article
The interaction of CO with K-ZSM-5 zeolite has been studied at 303 K by means of FT-IR spectroscopy and adsorption microcalorimetry, and compared with previous results concerning CO adsorption on Li- and Na-ZSM-5 zeolites. In all three cases, IR spectroscopy indicates the presence of two M+ sites, less distinguishable on Na-ZSM-5, and clearly obser...
Article
Fourier transform infrared spectrometry was used to study adsorption of dihydrogen on M+-ZSM-5 zeolites (M=Li, Na, K). Interaction of the adsorbed molecule with the zeolite adsorption centres renders the fundamental H-H stretching mode infrared active; the corresponding absorption bands appeared at 4092, 4101 and 4112 cm−1 for the Li, Na and K exch...
Article
Full-text available
Adsorption of dihydrogen onto the zeolites Na-ZSM-5 and K-ZSM-5 renders the fundamental H–H stretching mode infrared active. The corresponding infrared absorption bands were found at 4101 and 4112 cm−1 for H2/Na-ZSM-5 and H2/K-ZSM-5, respectively. Thermodynamic characterization of the adsorbed state was carried out by means of variable-temperature...
Article
A hybrid CTABr-silica mesophase of the MCM-41 structure type has been synthesized which hosts molecules of methylene blue (MB). XRD and UV–Vis evidence show that MB molecules act as co-surfactant and are located in the proximity of the internal silica surface. Their electrochemical activity has been studied by means of cyclic voltammetry (CV) and c...
Article
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When adsorbed on the faujasite-type K-Y zeolite, carbon monoxide forms cationic C-bonded K(CO)+ carbonyls and also O-bonded K(OC)+ isocarbonyls. The carbonyl species gives a characteristic C-O stretching band at 2158 cm−1, while that of the isocarbonyl appears at 2124 cm−1. By means of variable-temperature infrared spectroscopy, these K(CO)+ and K(...
Article
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Interaction of diatomic (polar) molecules with the surface of ionic solids is analysed by means of an electrostatic model which takes into account ion–dipole and ion–quadrupole interactions. This model was found to be capable of predicting the geometry of the adsorption complex, formation of isomeric states and relevant features of characteristic v...
Article
Gallium-containing mesoporous MCM-41 silica was synthesized at a nominal Si:Ga ratio of 16:1. Synthesis was carried out from a parent gel containing no cations other than NH4+ and cetyltrimethylammonium (template), so that following thermolysis of the template agent and ammonium ions the protonic form, H-GaMCM-41, was obtained. Powder X-ray diffrac...
Article
Full-text available
Gallium-containing mesoporous MCM-41 silica was synthesized at a nominal Si:Ga ratio of 16:1. Synthesis was carried out from a parent gel containing no cations other than NH4+ and cetyltrimethylammonium (template), so that following thermolysis of the template agent and ammonium ions the protonic form, H-GaMCM-41, was obtained. Powder X-ray diffrac...
Article
Silica-based hybrid mesostructured materials (MCM-41 type) containing surfactant- embedded Methylene Blue have been prepared and characterized by several techniques, including UV-Vis spectroscopy and cyclic voltammetry, and compared to other systems containing the same dye molecule. The micellar phase of the hybrid material was found to be permeabl...