Gil Bravo, Antonio
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Gil Bravo
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Antonio
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InaMat2. Instituto de Investigación en Materiales Avanzados y Matemáticas
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Publication Open Access Optimizing the removal of nitrate by adsorption onto activated carbon using response surface methodology based on the central composite design(Taylor & Francis, 2020) Taoufik, Nawal; Elmchaouri, Abdellah; Korili, Sophia A.; Gil Bravo, Antonio; Zientziak; Institute for Advanced Materials and Mathematics - INAMAT2; CienciasThis study sheds light on the adsorption process for the removal of nitrate ions from synthetic aqueous solutions. This contaminant pose a potential risk to the environment and can cause health effects including cancers and methemoglobinemia in infants. When the adsorption process is carried out, the effect by the several operating parameters such as initial nitrate concentration, pH, mass of activated carbon, and contact time becomes apparent. The essential process variables are optimized using response surface methodology (RSM) based on the central composite design (CCD) experiments. For this purpose 31 experimental results are required to determine the optimum conditions. The optimum conditions for the removal of nitrates is found to be: initial nitrate concentration = 15 mg/L; initial pH 4.0; mass of activated carbon = 25 mg, and contact time = 70 min. At these optimized conditions, the maximum removal of nitrates is found to be 96.59%.Publication Embargo Improvement of the adsorption properties of an activated carbon coated by titanium dioxide for the removal of emerging contaminants(Elsevier, 2019) Taoufik, Nawal; Elmchaouri, Abdellah; Anouar, Fatna; Korili, Sophia A.; Gil Bravo, Antonio; Zientziak; Institute for Advanced Materials and Mathematics - INAMAT2; CienciasThree activated carbon coated titanium dioxide composites are evaluated as adsorbents for the removal of three pharmaceutical compounds: clofibric, gallic and salicylic acids from aqueous solutions. These composite materials are characterized by several techniques as SEM, FT-IR, TGA and point of zero charge determination. The adsorption mechanism of acids was investigated and compared to the adsorption on the virgin carbon. The analysis of adsorption isotherms and kinetic properties reveals that the addition of TiO2 increased the adsorption capacities of the initial material. The adsorption kinetics has been studied in terms of pseudo-first and pseudo-second order kinetic models, and the Freundlich, Langmuir, Temkin, Tôth and Sips isotherms models have also been applied to the equilibrium adsorption data. The analysis of results indicated that the adsorption of acids on the activated carbon-titanium dioxide composites is well described by the pseudo-first order kinetic model and the Sips isotherm equation fitted the sorption experimental results better than other models.Publication Open Access Comparative removal of emerging contaminants from aqueous solution by adsorption on an activated carbon(Taylor & Francis, 2019) Gil Bravo, Antonio; Taoufik, Nawal; García Mora, Ana María; Korili, Sophia A.; Zientziak; Institute for Advanced Materials and Mathematics - INAMAT2; CienciasBatch sorption experiments were performed to study the adsorption of six emerging pollutants from aqueous solutions using a commercial granular activated carbon as adsorbent. Caffeine, clofibric acid, diclofenac, gallic acid, ibuprofen and salicylic acid were selected as representative contaminants. The activated carbon was characterized by nitrogen adsorption at 77 K, and through the determination of point of zero charge. The effects of several operational parameters, such as pH, initial concentration of organic molecules, mass of adsorbent and contact time, on the sorption behaviour were evaluated. The contact time to attain equilibrium for maximum adsorption was found to be 40 min. The kinetic data were correlated to several adsorption models, and the adsorption mechanism found to follow pseudo-second-order and intraparticle-diffusion models with external mass transfer predominating in the first 15 min of the experiment. The equilibrium adsorption data were analysed using the Freundlich, Langmuir and Toth isotherm equation models. The similar chemical structure and molecular weight of the organic pollutants studied to make the adsorption capacity of the activated carbon used very similar for all the molecules.