Encontrados 28 documentos, a visualizar página 1 de 3
Chemically-Activated Biochar from Ricinus communis L. Cake and Their Potential ...
Kalinke,Cristiane; Oliveira,Paulo R. de; Mangrich,Antonio S.; Marcolino-Junior,Luiz H.; Bergamini,Márcio F.Biochar is a rich-carbon material highly functionalized, which allows the use as electrodes modifier for preconcentration and voltammetric determination of several species. This work describes a castor cake biochar production and chemical activation with different reaction conditions using HNO3 and/or H2O2. Biochar samples were characterized using scanning electron microscopy, energy dispersive spectroscopy, th...
Synthesis, Characterization, and Synergic Photocatalytic Activity of Amorphous ...
Prola,Liziê D. T.; Bach-Toledo,Larissa; Schultz,Juliana; Mangrich,Antonio S.; Peralta-Zamora,Patricio G.In this work, we report the synthesis and characterization of new amorphous graphene-like TiO2/chitosan carbon microspheres and its performance as photocatalyst. Four different carbon chitosan microspheres materials were obtained based on the distinctive procedure to incorporate TiO2 and TiOSO4 to chitosan structure by pyrolysis at 600 °C. Detailed characterizations were carried out using many different techniq...
Rice Husk Ash as Raw Material for the Synthesis of Silicon and Potassium Slow-R...
França,Amanda A.; Schultz,Juliana; Borges,Roger; Wypych,Fernando; Mangrich,Antonio S.Rice husk ash (RHA) is a waste material produced in large quantities in many regions worldwide, and its disposal can be problematic. This work describes a method for using RHA to synthesize silicon and potassium slow-release fertilizer. The extraction of silica from RHA was accomplished by alkaline leaching with KOH. Different KOH concentrations and reaction times were evaluated and the best production of K2SiO...
Estudo espectroscópico de compósito obtido da reação no estado sólido entre um ...
Rezende,Edivaltris I. P. De; Mangrich,Antonio S.; Mangoni,Ana P.; Scarpellini,Marciela; Casellato,Annelise; Fernández,Tatiana L.The use of probes, such as paramagnetic species diluted in diamagnetic materials in EPR spectroscopy, and mathematical tools such, as the Kubelka-Munk function in DRUV-VIS spectroscopy are strategies in the analysis of complex mixtures of solid materials. The results obtained here show that the solid state reaction between the complex, [VO(acac)(BMIMAPY)] [ClO4], BMIMAPY = [(bis(1-methylimidazole-2-yl)methyl)(2...
Pilhas de combustíveis microbianas utilizadas na produção de eletricidade a par...
Rachinski,Silvio; Carubelli,Ademir; Mangoni,Ana Paula; Mangrich,Antonio S.In this review is presented an innovative technology for use of animal and vegetable waste with high pollution levels in microbial fuel cell (MFC) as an alternative to waste remediation and simultaneously producing electricity and fertilizer for agriculture. A brief history of MFC, the studies about the electron transfer mechanisms, discussion of the biological nanowires in bacteria and the use of chemical medi...
Synthesis, characterization, EPR spectroelectrochemistry studies and theoretica...
Romanowski,Stela Maris de M.; Machado,Sérgio P.; Friedermann,Geraldo R.; Mangrich,Antonio S.; Hermann,Monique de F.; Lima,Hugo Orofino; Nakagaki,ShirleyThe synthesis and characterization of the manganese(II) complexes [MnII(Hbpeten)] and [MnII(Hbnbpeten)], where H3bpeten and H3bnbpeten are respectively [N,N'-bis-(2-hydroxybenzyl)-N-(2-pyridylmethyl)-N'-(2-hydroxyethyl)ethane-1,2-diamine] and [N,N'-bis-(5-nitro-2-hydroxybenzyl)-N'-(2-hydroxyethyl)ethane-1,2-diamine], are reported. The characterization was carried out by elemental analyses, cyclic voltammetry, s...
Binuclear CuII complexes as catalysts for hydrocarbon and catechol oxidation re...
Martins,Luciana R.; Souza,Elizabeth T.; Fernandez,Tatiana L.; Souza,Bernardo de; Rachinski,Sílvio; Pinheiro,Carlos B.; Faria,Roberto B.The tridentate ligands HL1, [(2-hydroxybenzyl)(2-(imidazol-2-yl)ethyl)]amine, and HL2, [(2-hydroxybenzyl)(2-(pyridil-2-yl)ethyl]amine, were used to synthesize binuclear CuII complexes, [Cu2(L1)2]Cl22H2O, complex 1, and [Cu2(L2)2](ClO4)21.5H2O, complex 2, in order to obtain catalysts for oxidative processes. Both complexes were characterized by elemental analysis, IR, UV-Vis and EPR spectroscopies. In addition...
Theoretical studies of the tautomerism in 3-(2-R-Phenylhydrazono)-naphthalene- ...
Francisco,Acácio I.; Vargas,Maria D.; Fragoso,Thaís P.; Carneiro,J. Walkimar de M.; Casellato,Annelise; Silva,Fernando de C. da; Ferreira,Vitor F.DFT calculations using the B3LYP and PBE1PBE functionals with the standard 6-31G(d) and 6-311+G(2d,p) basis sets were carried out for the 3-(2-phenylhydrazone)-naphthalene-1,2,4-trione system in solution (dmso) and in the gas phase, and showed the keto-hydrazone forms (rotamers Ia and Ib) to be more stable than the enol-azo forms (rotamers IIa and IIb, by about 14 kcal mol-1) and III (by approximately 6 kcal mo...
Proposal of an EPR based method for pollution level monitoring in mangrove sedi...
Mangrich,Antonio S.; Silva,Lenise da; Pereira,Betania F.; Messerschmidt,IaraThe objective of this study was the monitoring of the pollution level of underwater mangrove sediments using electron paramagnetic resonance (EPR), near-infrared (NIR) spectroscopy and chemical analyses. EPR spectroscopy was useful to determine the presence of organic free radical semiquinone, as well as, to provide information about the presence of trivalent iron in diluted and concentrated or clustered domini...
Lessons from the Terra Preta de Índios of the Amazon region for the utilisation...
Novotny,Etelvino H.; Hayes,Michael H. B.; Madari,Beáta E.; Bonagamba,Tito J.; Azevedo,Eduardo R. de; Souza,André A. de; Song,GuixueThe potential of charcoal and of partially combusted organic waste to mimic the soil organic matter of the Terras Pretas de Índios (Amazonian Dark Earths) from the Amazon Region is discussed. These materials serve as soil conditioners and as sequesterers of carbon in recalcitrant and in reactive forms. Studies carried out by Brazilian and by international groups have contributed to the emergence of an awareness...