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Patiño Y, Pilehvar S, Díaz E, Ordóñez S, De Wael K. Electrochemical reduction of nalidixic acid at glassy carbon electrode modified with multi-walled carbon nanotubes. JOURNAL OF HAZARDOUS MATERIALS 2017; 323:621-631. [PMID: 27776850 DOI: 10.1016/j.jhazmat.2016.10.023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Revised: 09/25/2016] [Accepted: 10/12/2016] [Indexed: 06/06/2023]
Abstract
The aqueous phase electrochemical degradation of nalidixic acid (NAL) is studied in this work, using cyclic voltammetry (CV) and differential pulse voltammetry (DPV) as instrumental techniques. The promotional effect of multi-walled carbon nanotubes (MWCNT) on the performance of glassy carbon electrodes is demonstrated, being observed that these materials catalyze the NAL reduction. The effect of surface functional groups on MWCNT -MWCNT-COOH and MWCNT-NH2-was also studied. The modification of glassy carbon electrode (GCE) with MWCNT leads to an improved performance for NAL reduction following the order of MWCNT>MWCNT-NH2>MWCNT-COOH. The best behavior at MWCNT-GCE is mainly due to both the increased electrode active area and the enhanced MWCNT adsorption properties. The NAL degradation was carried out under optimal conditions (pH=5.0, deposition time=20s and volume of MWCNT=10μL) using MWCNT-GCE obtaining an irreversible reduction of NAL to less toxic products. Paramaters as the number of DPV cycles and the volume/area (V/A) ratio were optimized for maximize pollutant degradation. It was observed that after 15 DPV scans and V/A=8, a complete reduction was obtained, obtaining two sub-products identified by liquid chromatography-mass spectrometry (LC-MS).
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Díaz E, Ordóñez S, Vega A. An IGC Study of the Role of Washing Procedures on the Adsorption Properties of Activated Carbons. ADSORPT SCI TECHNOL 2016. [DOI: 10.1260/026361707782398245] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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Faba L, Díaz E, Vega A, Ordóñez S. Hydrodeoxygenation of furfural-acetone condensation adducts to tridecane over platinum catalysts. Catal Today 2016. [DOI: 10.1016/j.cattod.2015.09.055] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Zapico RR, Marín P, Díez FV, Ordóñez S. Liquid hold-up and gas–liquid mass transfer in an alumina open-cell foam. Chem Eng Sci 2016. [DOI: 10.1016/j.ces.2016.01.008] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Faba L, Díaz E, Ordóñez S. Base-Catalyzed Condensation of Levulinic Acid: A New Biorefinery Upgrading Approach. ChemCatChem 2016. [DOI: 10.1002/cctc.201600064] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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González C, Marín P, Díez FV, Ordóñez S. Gas-Phase Hydrodeoxygenation of Benzaldehyde, Benzyl Alcohol, Phenyl Acetate, and Anisole over Precious Metal Catalysts. Ind Eng Chem Res 2016. [DOI: 10.1021/acs.iecr.6b00036] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Garcés D, Díaz E, Sastre H, Ordóñez S, González-LaFuente JM. Evaluation of the potential of different high calorific waste fractions for the preparation of solid recovered fuels. WASTE MANAGEMENT (NEW YORK, N.Y.) 2016; 47:164-173. [PMID: 26318421 DOI: 10.1016/j.wasman.2015.08.029] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Revised: 08/20/2015] [Accepted: 08/20/2015] [Indexed: 06/04/2023]
Abstract
Solid recovered fuels constitute a valuable alternative for the management of those non-hazardous waste fractions that cannot be recycled. The main purpose of this research is to assess the suitability of three different wastes from the landfill of the local waste management company (COGERSA), to be used as solid recovered fuels in a cement kiln near their facilities. The wastes analyzed were: End of life vehicles waste, packaging and bulky wastes. The study was carried out in two different periods of the year: November 2013 and April 2014. In order to characterize and classify these wastes as solid recovered fuels, they were separated into homogeneous fractions in order to determine different element components, such as plastics, cellulosic materials, packagings or textile compounds, and the elemental analysis (including chlorine content), heavy metal content and the heating value of each fraction were determined. The lower heating value of the waste fractions on wet basis varies between 10 MJ kg(-1) and 42 MJ kg(-1). One of the packaging wastes presents a very high chlorine content (6.3 wt.%) due to the presence of polyvinylchloride from pipe fragments, being the other wastes below the established limits. Most of the wastes analyzed meet the heavy metals restrictions, except the fine fraction of the end of life vehicles waste. In addition, none of the wastes exceed the mercury limit content, which is one of the parameters considered for the solid recovered fuels classification. A comparison among the experimental higher heating values and empirical models that predict the heating value from the elemental analysis data was carried out. Finally, from the three wastes measured, the fine fraction of the end of life vehicles waste was discarded for its use as solid recovered fuels due to the lower heating value and its high heavy metals content. From the point of view of the heating value, the end of life vehicles waste was the most suitable residue with a lower heating value of 35.89 MJ kg(-1), followed by the packaging waste and the bulky waste, respectively. When mixing the wastes studied a global waste was obtained, whose classification as solid recovered fuels was NCV 1 Cl 3 Hg 3. From the empirical models used for calculating higher heating value from elemental content, Scheurer-Kestner was the model that best fit the experimental data corresponding to the wastes collected in November 2013, whereas Chang equation was the most approximate to the experimental heating values for April 2014 fractions. This difference is due to higher chlorine content of the second batch of wastes, since Chang equation is the only one that incorporates the chlorine content.
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Patiño Y, Díaz E, Ordóñez S, Gallegos-Suarez E, Guerrero-Ruiz A, Rodríguez-Ramos I. Adsorption of emerging pollutants on functionalized multiwall carbon nanotubes. CHEMOSPHERE 2015; 136:174-180. [PMID: 25989605 DOI: 10.1016/j.chemosphere.2015.04.089] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2014] [Revised: 03/04/2015] [Accepted: 04/19/2015] [Indexed: 06/04/2023]
Abstract
Adsorption of three representative emerging pollutants - 1,8-dichlorooctane, nalidixic acid and 2-(4-methylphenoxy)ethanol- on different carbon nanotubes was studied in order to determine the influence of the morphological and chemical properties of the materials on their adsorption properties. As adsorbents, multiwall carbon nanotubes (MWCNTs) without functionalization and with oxygen or nitrogen surface groups, as well as carbon nanotubes doped with nitrogen were used. The adsorption was studied in aqueous phase using batch adsorption experiments, results being fitted to both Langmuir and Freundlich models. The adsorption capacity is strongly dependent on both the hydrophobicity of the adsorbates and the morphology of the adsorbents. Thermodynamic parameters were determined observing strong interactions between the aromatic rings of the emerging pollutant and the nitrogen modified adsorbents.
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Krivtsov I, Ilkaeva M, Avdin V, Amghouz Z, Khainakov SA, García JR, Díaz E, Ordóñez S. Exceptional thermal stability of undoped anatase TiO2 photocatalysts prepared by a solvent-exchange method. RSC Adv 2015. [DOI: 10.1039/c5ra01114k] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
A new solvent-exchange method for preparation of undoped anatase TiO2 nanoparticles with unprecedented thermal stability has been presented.
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Patiño Y, Díaz E, Ordóñez S. Performance of different carbonaceous materials for emerging pollutants adsorption. CHEMOSPHERE 2015; 119 Suppl:S124-S130. [PMID: 24907714 DOI: 10.1016/j.chemosphere.2014.05.025] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2014] [Revised: 05/08/2014] [Accepted: 05/09/2014] [Indexed: 06/03/2023]
Abstract
The adsorption of three representative emerging pollutants over different kinds of carbonaceous adsorbents has been studied in this work. The adsorbates were nalidixic acid (NAL, representative of a pharmaceutical), 1,8-dichlorooctane (DCO, a chloroparaffin) and methyl-phenoxy-ethanol (MPET, a surfactant). Activated carbons, carbon nanofibers, carbon nanotubes and high surface area graphites have been tested as adsorbents. Adsorption isotherms, carried out in a batch system, were fitted using both a Langmuir and a Freundlich model. It was shown that the capacity of adsorption follows the order DCO≫NAL>MPET for all the adsorbents, and among the adsorbents, the external morphology (surface area and mesoporous volume) is the key parameter. The results from thermodynamic analysis show, however, that both morphological and chemical properties of both adsorbates and adsorbents influenced their behavior.
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Faba L, Díaz E, Ordóñez S. Role of the support on the performance and stability of Pt-based catalysts for furfural–acetone adduct hydrodeoxygenation. Catal Sci Technol 2015. [DOI: 10.1039/c4cy01360c] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The roles of metal dispersion and support properties of Pt catalysts on their performance for HDO of condensation adducts have been determined.
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Faba L, Díaz E, Ordóñez S. One-pot aldol condensation and hydrodeoxygenation of biomass-derived carbonyl compounds for biodiesel synthesis. CHEMSUSCHEM 2014; 7:2816-20. [PMID: 25088473 DOI: 10.1002/cssc.201402236] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2014] [Indexed: 05/27/2023]
Abstract
Integrating reaction steps is of key interest in the development of processes for transforming lignocellulosic materials into drop-in fuels. We propose a procedure for performing the aldol condensation (reaction between furfural and acetone is taken as model reaction) and the total hydrodeoxygenation of the resulting condensation adducts in one step, yielding n-alkanes. Different combinations of catalysts (bifunctional catalysts or mechanical mixtures), reaction conditions, and solvents (aqueous and organic) have been tested for performing these reactions in an isothermal batch reactor. The results suggest that the use of bifunctional catalysts and aqueous phase lead to an effective integration of both reactions. Therefore, selectivities to n-alkanes higher than 50% were obtained using this catalyst at typical hydrogenation conditions (T=493 K, P=4.5 MPa, 24 h reaction time). The use of organic solvent, carbonaceous supports, or mechanical mixtures of monofunctional catalysts leads to poorer results owing to side effects; mainly, hydrogenation of reactants and adsorption processes.
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Faba L, Díaz E, Ordóñez S. Improvement on the catalytic performance of Mg-Zr mixed oxides for furfural-acetone aldol condensation by supporting on mesoporous carbons. CHEMSUSCHEM 2013; 6:463-473. [PMID: 23362138 DOI: 10.1002/cssc.201200710] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2012] [Revised: 11/29/2012] [Indexed: 06/01/2023]
Abstract
A new procedure for improving the performance of the most common catalysts used in aqueous-phase aldol condensation (Mg-Zr mixed oxides) reactions is presented. This reaction is of interest for upgrading carbohydrate feedstocks. The procedure involves supporting Mg-Zr oxides on non-microporous carbonaceous materials, such as carbon nanofibers (CNFs) or high-surface-area graphites (HSAGs), using either incipient wetness or coprecipitation procedures. The use of HSAGs together with the coprecipitation method provides the best performance. Results obtained for the cross-condensation of acetone and furfural at 323 K reveal that the catalyst performance is greatly improved compared to the bulk oxides (96.5 % conversion vs. 81.4 % with the bulk oxide; 87.8 % selectivity for C13 and C8 adducts vs. 76.2 % with the bulk oxide). This difference is even more prominent in terms of rates per catalytically active basic site (four and seven times greater for C8 and C13 adducts, respectively). The improved performance is explained in terms of a more appropriate basic site distribution and by greater interaction of the reactants with the carbon surface. In addition, deactivation behavior of the catalyst is improved by tuning the morphology of the carbonaceous support. An important enhancement of the catalytic stability can be obtained selecting a HSAG with an appropriate pore diameter. With HSAG100 the activity decreased by less than 20 % between successive reaction cycles and the selectivity for the condensation products remained almost unaltered. The decrease is greater than 80 % for the bulk oxides tested at these conditions, with important increases in the selectivity for by-product formation.
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Pascual E, Martínez A, Ordóñez S. Gout: The mechanism of urate crystal nucleation and growth. A hypothesis based in facts. Joint Bone Spine 2013; 80:1-4. [DOI: 10.1016/j.jbspin.2012.08.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2012] [Accepted: 08/23/2012] [Indexed: 10/27/2022]
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Gutiérrez I, Díaz E, Vega A, Ordóñez S. Consequences of cavity size and chemical environment on the adsorption properties of isoreticular metal-organic frameworks: An inverse gas chromatography study. J Chromatogr A 2013; 1274:173-80. [DOI: 10.1016/j.chroma.2012.12.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2012] [Revised: 12/03/2012] [Accepted: 12/04/2012] [Indexed: 10/27/2022]
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Kusema BT, Faba L, Kumar N, Mäki-Arvela P, Díaz E, Ordóñez S, Salmi T, Murzin DY. Hydrolytic hydrogenation of hemicellulose over metal modified mesoporous catalyst. Catal Today 2012. [DOI: 10.1016/j.cattod.2012.02.031] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Marín P, Ordóñez S, Díez FV. Rational design of heating elements using CFD: Application to a bench-scale adiabatic reactor. Comput Chem Eng 2011. [DOI: 10.1016/j.compchemeng.2010.11.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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León M, Díaz E, Ordóñez S. Ethanol catalytic condensation over Mg–Al mixed oxides derived from hydrotalcites. Catal Today 2011. [DOI: 10.1016/j.cattod.2010.10.003] [Citation(s) in RCA: 118] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Asedegbega-Nieto E, Díaz E, Vega A, Ordóñez S. Transition metal-exchanged LTA zeolites as novel catalysts for methane combustion. Catal Today 2010. [DOI: 10.1016/j.cattod.2010.05.032] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Marín P, Ordóñez S, Díez FV. Monoliths as suitable catalysts for reverse-flow combustors: Modeling and experimental validation. AIChE J 2010. [DOI: 10.1002/aic.12215] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Fort R, Bernabeu A, García del Cura MA, López de Azcona MC, Ordóñez S, Mingarro F. La Piedra de Novelda: una roca muy utilizada en el patrimonio arquitectónico. ACTA ACUST UNITED AC 2010. [DOI: 10.3989/mc.2002.v52.i266.332] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Ordóñez S, Díaz E, Bueres RF, Asedegbega-Nieto E, Sastre H. Carbon nanofibre-supported palladium catalysts as model hydrodechlorination catalysts. J Catal 2010. [DOI: 10.1016/j.jcat.2010.03.001] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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León M, Díaz E, Bennici S, Vega A, Ordóñez S, Auroux A. Adsorption of CO2 on Hydrotalcite-Derived Mixed Oxides: Sorption Mechanisms and Consequences for Adsorption Irreversibility. Ind Eng Chem Res 2010. [DOI: 10.1021/ie902072a] [Citation(s) in RCA: 158] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Bueres RF, Asedegbega-Nieto E, Díaz E, Ordóñez S, Díez FV. Performance of carbon nanofibres, high surface area graphites, and activated carbons as supports of Pd-based hydrodechlorination catalysts. Catal Today 2010. [DOI: 10.1016/j.cattod.2009.05.020] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Marín P, Ho W, Ordóñez S, Díez FV. Demonstration of a control system for combustion of lean hydrocarbon emissions in a reverse flow reactor. Chem Eng Sci 2010. [DOI: 10.1016/j.ces.2009.02.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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