17 documents found, page 1 of 2
Iron Recovery from Iron Ore Tailings by Direct Hydrogen Reduction at Low Temper...
Pinto,Paula S.; Milagre,Luisa E.; Moreira,Larissa C. M.; Rocha Junior,Hamilton P.; Salviano,Adriana B.; Ardisson,José D.; Parreira,Fabrício V.In this work, we describe a sustainable alternative to recover iron from two iron ore tailings (IOT) using hydrogen reduction at relatively low temperatures followed by magnetic separation. X-ray powder diffraction (XRD), inductively coupled plasma (ICP), atomic absorption (AA), Mössbauer, scanning electron microscopy (SEM/EDS), Raman and thermogravimetry (TG) analyses indicated that the Fe oxide present in the...
Microwave Assisted Ultra-Fast Method to Synthesize Carbonate-Phosphates, Na3MCO...
Costa,Demétrio A. S.; Costa,Lorena A. C.; Mendes,João O.; Mussel,Wagner N.; Ardisson,José D.; Montoro,Luciano A.Although largely used in mobiles and electric vehicles applications, insertion batteries based on Li-ion technology are high-cost devices. These applications require high-performance energy storage systems with high-energy and high-power densities, which are better attained by Li-ion technology. However, stationary applications such as power plants and uninterruptible power supplies (UPS) mainly require low-cos...
New Magnetic Fe Oxide-Carbon Based Acid Catalyst Prepared from Bio-Oil for Este...
Ballotin,Fabiane C.; Almeida,Vitor F.; Ardisson,José D.; Silva,Márcio J. da; Soares,Ricardo R.; Teixeira,Ana Paula C.; Lago,Rochel M.In this work, bio-oil (an organic matrix rich in oxygen functionalities) was used to efficiently dissolve and disperse Fe3+ which upon thermal treatment produced a carbon containing dispersed and encapsulated Fe oxide magnetic nanoparticles. These materials were prepared by dissolution of 8, 16 and 24 wt.% Fe3+ salt in bio-oil followed by treatment at 400, 450, 500 or 600 ºC in N2 atmosphere. X-ray diffraction ...
Zinc Hexacyanoferrate/Multi-Walled Carbon Nanotubes Films for Rechargeable Aque...
Silva,Murillo N. T.; Ardisson,José D.; Fabris,José D.; Nossol,EdsonZinc hexacyanoferrate (ZnHCF) is a Prussian Blue analog and can be intercalated by both monovalent and divalent ions. ZnHCF/multi-walled carbon nanotube (MWCNT) film could be used as a cathode for zinc ions battery. Carbon nanotubes improved significantly the electrochemical performance of the electrode. It is described the preparation of ZnHCF/MWCNT films by the interfacial method with cyclohexane/water mixtur...
Application of Nickel Ferrite Nanoparticles in Adsorption of Amoxicillin Antibi...
Caetano,Patricia M. A.; Simões,Nathália M.; Pinto,Paula S.; Fernandez-Outon,Luis E.; Albuquerque,Adriana S.; Macedo,Waldemar A. A.; Ardisson,José D.According to the World Health Organization, amoxicillin (AMX) is the most widely consumed antibiotic in the world. Consequently, there is great interest in the development of new technologies that allow the removal of this type of contaminant, as exposure to antibiotic residues can cause a variety of adverse effects, such as toxicity and antimicrobial resistance. In this work, AMX adsorption from aqueous soluti...
Controlled Dehydration of Fe(OH)3 to Fe2O3: Developing Mesopores with Complexin...
Pinto,Paula S.; Lanza,Giovani D.; Ardisson,José D.; Lago,Rochel M.In this work, efficient adsorbents for β-lactam antibiotics based on mesoporous iron oxide containing surface [FeOx(OH)y] sites were produced by controlled precipitation of iron hydroxide and thermal treatment at 150, 200, 300 and 450 ºC (150FeOH, 200FeOH, 300FeOH and 450FeOH, respectively). Mössbauer, X-ray diffraction (XRD), thermogravimetry-mass spectrometry (TG-MS), Fourier transform infrared spectroscopy (...
SAIS DE TETRAFENILFOSFÔNIO E TRIS(1,10-FENANTROLINA)FERRO(II) DE COMPLEXOS ANIÔ...
Bottega,Fernanda C.; Oliveira,Marcelo R. L.; Rubinger,Mayura M. M.; Bellato,Carlos R.; Ardisson,José D.; Zambolim,LaercioSix new salts of organometallic complexes of tin(IV) with the general formulae: (Ph4P)2[Sn(Bu)2(RSO2N=CS2)2] and [Fe(phen)3][Sn(Bu)2(RSO2N=CS2)2] [Ph4P = tetraphenylphosphonium, R = CH3 (1), C2H5 (2) and C4H9 (3); Fe(phen)3 = tris(1,10-phenanthroline)iron(II), R = CH3 (4), C2H5 (5) and C4H9 (6)] were synthetized from potassium dithiocarbimates (RSO2N=CS2K2.H2O) in reaction with dichlorobis-n-butyltin(IV) and te...
Cellulose Nanocrystals Assembled on the Fe3O4Surface as Precursor to Prepare In...
Cunha,Igor T.; Teixeira,Ivo F.; Mesquita,João P.; Ardisson,José D.; Binatti,Ildefonso; Pereira,Fabiano V.; Lago,Rochel M.In this work, composites based on carbon (1, 10 and 20 wt.%) interfaced with Fe3O4 (magnetite) have been studied as catalysts for the oxidation of aqueous sulfide. The composites were prepared by assembling cellulose nanocrystals surrounding Fe3O4 followed by a controlled thermal decomposition at 400, 600 and 800 ºC. Mössbauer, X-ray diffractometry (XRD), Raman, thermogravimetry (TG), elemental analysis CHN, sc...
SÍNTESE E CARACTERIZAÇÃO DE NOVOS ORGANOMETÁLICOS DE ESTANHO (IV) COM LIGANTES ...
Bottega,Fernanda C.; Oliveira,Marcelo R. L.; Sérvulo,Vanessa Pio; Visconte,Leila L. Y.; Ardisson,José D.; Rubinger,Mayura M. M.This paper describes the synthesis of four new organotin compounds of general formula: (Ph4P)[Sn(Cy)3(RSO2N=CS2)] [Ph4P = tetraphenylphosphonium cation, Cy = cyclohexyl, R = C6H5 (1), 4-ClC6H4 (2), 4-BrC6H4 (3) and 4-IC6H4 (4)]. They were obtained by the reaction between four different potassium N-R-sulfonyldithiocarbimate salts and tricyclohexyltin chloride in methanol, and were isolated as tetraphenylphosphon...
A Mesoporous SiO2/γ-Fe2O3/KI Heterogeneous Magnetic Catalyst for the Green Synt...
Macedo,Alice L.; Fabris,José D.; Pires,Manoel J. M.; Oliveira,Wanessa L.; Ardisson,José D.; Augusti,Rodinei; Aragón,Fermin H.; Santos,Ricardo S.A magnetic catalyst (sample MCat) consisting of KI supported on a mixture of silica and maghemite (γ-Fe2O3) was prepared and used in the transesterification reaction for the synthesis of biodiesel. The energy dispersive X-ray spectrum of the catalyst showed signals due to Si, Fe, K, and I. Powder X-ray diffraction data revealed the amorphous nature of the SiO2 and the duly impregnation of the support with KI. 5...