A5057189741- Layered Double Hydroxides Synthesis and Applications
- Advanced Photocatalysis Techniques
- Catalytic Processes in Materials Science
- Bauxite Residue and Utilization
- Magnesium Oxide Properties and Applications
- Mesoporous Materials and Catalysis
- Extraction and Separation Processes
- Zeolite Catalysis and Synthesis
- Chemical Synthesis and Characterization
- Adsorption and biosorption for pollutant removal
- Covalent Organic Framework Applications
- Carbon Dioxide Capture Technologies
- Catalysis and Hydrodesulfurization Studies
- Aerogels and thermal insulation
- Fermentation and Sensory Analysis
- Chemical Looping and Thermochemical Processes
- Aluminum Alloys Composites Properties
- Polyoxometalates: Synthesis and Applications
- Lignin and Wood Chemistry
- Phase Equilibria and Thermodynamics
- Nanomaterials for catalytic reactions
- Advanced oxidation water treatment
- Supercapacitor Materials and Fabrication
- Polymer Foaming and Composites
- Chemical Synthesis and Reactions
Universidad de Salamanca
2020-2024
This work describes a valorization procedure for one of the most important wastes generated during aluminum recycling, namely, saline slag. was divided in two steps: a) recovery or its compounds various fractions, and b) use those fractions synthesis zeolites: analcime (NaAlSi2O6·H2O) pollucite (CsAlSi2O6·nH2O). Saline slag ground, sieved (1 mm), washed separated into different sizes, larger another smaller than 0.4 mm. The fraction mm treated under reflux conditions with NaOH CsOH...
Synthesis of hydrocalumite–TiO2 hybrid systems and their use in photodegradation ibuprofen is reported for the first time. Hydrocalumite was prepared with Al3+ recovered from an aluminum slag (circular economy), TiO2 deposited on hydrocalumite by hydrolysis titanium(IV) isopropoxide, solids thus obtained were calcined at 400 750 ºC. The solid ºC essentially amorphous, showing presence calcite due to fixation atmospheric CO2, while composed mayenite, perovskite rutile. used catalytic...
Hydrocalumite (Ca2Al(OH)6Cl·2H2O) samples were prepared by the coprecipitation method, using Al3+ obtained from an aluminum slag, extracted in NaOH solutions and purified removing silica precipitation with HCl. aging was assisted microwave irradiation, carried out under different temperatures. Very pure hydrocalumite certain conditions, but impurified katoite (Ca3Al2(OH)12) calcite (CaCO3) other cases. The thermal decomposition of is complex not completely elucidated, compounds such as...
A management process for saline slags, one of the wastes from Secondary Aluminum Production, is proposed. The begins with a grinding step, followed by washing water, which removed fluxing salts but provoking hydrolysis AlN, yielding Al(OH)3 and ammonia. Sieving solid generated an intermediate fine fraction. first was rich in metallic aluminum, can also be returned to Production. fraction submitted extraction acid (HCl or HNO3) alkaline (NaOH, KOH CsOH) conditions, under reflux at 90 ºC,...
Solids with photocatalytic properties have been prepared by calcination of hydrocalumite (a sort layered double hydroxide, LDH) at 750 °C, which had using an aluminum salt cake as a source. The characterization the obtained solids was performed powder X–ray diffraction, FT–infrared spectroscopy, thermal analysis, N2 adsorption–desorption isotherms −196 °C and electron microscopy. Different crystalline phases were identified depending on amount Fe3+ incorporated. Fe–free photocatalyst showed...
Solids with potential application in tyrosol (Ty) removal by photo–Fenton processes have been synthesized using aluminum salt cake as a source. Two series of hydrocalumite layered double hydroxides (LDH) were synthesized: one containing structural Fe3+ (occupying octahedral positions the LDH) and another surface impregnated Fe3+; all solids calcined air at 750 ºC. The characterized powder X–ray diffraction, FT–infrared spectroscopy, thermal analysis, N2 adsorption–desorption isotherms –196...
Potentially–CO2 adsorbing solids at moderate temperature have been prepared by calcination 400 °C and 750 of CaAlFe hydrocalumites (a sort Ca2+–layered double hydroxide), which had using a salt cake as aluminum source. The characterization the obtained was carried out powder X–ray diffraction, FT–infrared spectroscopy, thermal analysis, N2 adsorption–desorption isotherms –196 electron microscopy. After calcination, different crystalline phases were identified function amount Fe3+...
This work proposes the use of supercritical CO2 to impregnate starch (potato and corn) aerogels with quercetin for a potential fungistatic application. Starch were successfully produced drying, but different results found depending on amylose/amylopectin ratio. A higher amount amylose increases aerogels' specific surface area (with structure nanofibrils nodes) due linear amorphous character this polymer, whereas amylopectin decreases property until values only 25 m2·g-1, obtaining an aerogel...
Aluminium was successfully extracted by treating an aluminium slag with aqueous NaOH under reflux conditions. This solution purified precipitation of silicon species addition HCl up to pH = 1, and used for preparing hydrocalumite (Ca2Al(OH)6Cl·2H2O) the coprecipitation method. The effect temperature on properties prepared microwave (MW) irradiation studied. Characterization obtained solid carried out powder X-ray diffraction (PXRD), thermal analysis, FT–IR spectroscopy, chemical electron...
Aluminum from saline slags generated during the recycling of this metal, extracted under reflux conditions with aqueous NaOH, was used in synthesis hydrocalumite-type solids formula Ca2Al1–mFem(OH)6Cl·2H2O. The characterization obtained carried out by powder X-ray diffraction, infrared spectroscopy, thermal analysis, element chemical N2 adsorption-desorption at −196 °C and electron microscopy. results showed formation Layered Double Hydroxide-type compounds whose characteristics varied as...
NiO nanoparticles have been synthetized by calcination of layered double hydroxides (LDHs) precursors prepared using dimethylamine (DMA) as a precipitating agent. The incorporation Ce and La oxides to the structure was investigated. samples were characterized element chemical analysis, powder X-ray diffraction, FT-IR spectroscopy, thermal analysis specific surface area analysis. Furthermore, optical band gaps semiconductor estimated ultraviolet-visible diffuse reflectance spectroscopy....
Amines with two carbon atoms in the organic chain [ethylamine (EA), diethylamine (DEA), triethylamine (TEA)] have been used as precipitant agents to obtain a hydrotalcite-like compound Zn (II) and Al (III) layered cations nitrate anions interlayered region balance charge. This Layered Double Hydroxide was prepared following coprecipitation method, effect on crystal particle sizes studied. Also, of submitting obtained solids hydrothermal post-synthesis treatment by conventional heating...
A simple, easily applicable method is proposed to quantify the amount of ZnO segregated during synthesis and post-synthesis treatments Zn-Al layered double hydroxides with hydrotalcite structure. The provides a feasible, easy, fast, reliable way get values for content, can be extended other compounds.
Iron-containing alumina materials were prepared by the non-hydrolytic sol-gel method in presence of surfactants and their use as catalysts oxidation hydrocarbons was studied. The solids mesoporous, with large specific surface areas, > 250 m2/g for treated at 500 °C, depending on surfactant used (cetyltrimethylammonium bromide, sodium dodecyl sulfate or hexadecylamine), calcination treatment applied (500 1000 °C). Iron well distributed surface, confirmed EPR signals 4.3 2.0 G SEM imaging....
Nowadays scientific and technological advances have allowed to Mankind improve the life-style, but in this way, other problems appeared. Currently, environmental are one of most important. Many countries developed a large number laws with purpose reducing human industrial effects environment. In work, valorization procedure is for important wastes generated during aluminum recycling, namely, saline slag, finding that final solids can be used applications. The divided into two steps: 1)...