Antonio S. Mangrich

Universidade Federal do Paraná | UFPR · Department of Chemistry

Propranolol (PRO) hydrochloride is one of the most commonly used β-blockers for cardiovascular diseases that is frequently detected in aquatic environment. Photocatalytic removal of propranolol using an efficient UV and visible light responsive neodymium (Nd)-modified photocatalyst has been investigated. Nd–TiO2 nanoparticles were synthesized by a...

No‐tillage farming combined with temporary cattle grazing is becoming a common practice in parts of South America. We quantified the effects of no‐tillage and winter grazing of annual ryegrass ( Lolium multiflorum Lam.) on soil carbon and nitrogen stock, stratification ratio (concentration in 0–5 to 10–20‐cm layer) and lability (based on particulat...

Biochar is a charcoal produced from the biomass pyrolysis process that presents a highly porous and functionalized surface. In the present work an array of carbon paste electrodes (CPE) made of different forms of carbon (graphite, carbon nanotubes and activated biochar) was evaluated in the development of an electronic tongue for discrimination and...

Biomasses have been used as adsorbents since they are inexpensive and can offer excellent performance in adsorption of pollutants and in water remediation. To increase their performance, thermal decomposition of biomass under oxygen-limited conditions to produce biochar has attracted increasing attention. The properties of biochar are affected by t...

O uso de resíduos vegetais carbonizados vem sendo resgatado e avaliado como alternativa para melhorar a qualidade do solo. O material gerado, denominado biocarvão, é o produto formado a partir da pirólise, que é a alteração térmica da biomassa em ambiente fechado, com suprimento limitado de oxigênio e em temperaturas relativamente baixas. A composi...

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 an...

CHEMICAL CONTRIBUTION TO THE WASTEWATER MANAGEMENT PLAN OF HEALTH SERVICES. In this study were analyzed the main lines of health care waste at the Hospital of the Federal University of Paraná (HC/UFPR), performing an inventory that aims from awareness, characterization, until a viable wastewater treatment proposal for the institution. In this conte...

This work describes the removal of pesticides from water using activated and magnetized biochars produced from exhausted husk, and dry tannin from barks of black wattle (Acacia mearnsii De Wild.). These materials were characterized using chemical, spectroscopic, thermal, solid structure and surface area techniques. The activated and magnetized bioc...

Two copper(II) mononuclear complexes were synthesized and investigated as promiscuous oxidative catalysts: [Cu(pymimi)Cl 2 ]: [(2-(pyridyl-2-yl)ethyl)((1-methylimidazol-2-yl)methyl)imine](bischlorido)-copper(II), C1, and [Cu(pymima)Cl 2 ]: [(2-(pyridyl-2-yl)ethyl)((1-methylimidazol-2-yl)methyl)amine] (bischlorido)copper(II), C2. Both complexes were...

In this first part of our work about innovation in biorefineries, the biomass is previously treated to separate cellulose from other components of the vegetal biomass, followed by acid hydrolysis to produce glucose, which is then fermented to produce second generation (2G) ethanol. The unwanted biomass generated in this first stage will be submitte...

The aim of this study was to evaluate the interactions of peat, humic acids, and humin with urea dispersed in chitosan, in systems intended for the controlled release of urea. Spheres of chitosan with humic material and urea intentionally added to the media were prepared and characterized by means of elemental analysis (CHN), electron paramagnetic...

The fi rst 10 cm of sediment from Lake Chapala, Western Mexico are in constant activity related to the exchange and speciation of metal cations. Samples of this sediment were analyzed in electron paramagnetic resonance (EPR) equipment to study the paramagnetic metals. Assays indicated that only Fe3+ was present in a detectable amount. This cation,...

The present invention deals with the preparation of carbonaceous material with a structure similar to graphene by pyrolysis. It is used as a raw material biomass industrial waste composed of black wattle exhausted bark. This carbonaceous material is applied to the decontamination of hydrophobic organic compounds soluble on mineral or vegetable oils...

Titanium dioxide is frequently used for the photocatalytic degradation of organic and inorganic pollutants present in the air, such as NOx. In this work, biomorphic anatase-based plates were manufactured using paper as an innovative template for fixation of TiO2. Ceramics with microstructure similar to paper were produced by infiltration of titaniu...

Sorption and desorption of heavy metals (Cd, Cu, Pb, and Zn) was evaluated in biochars derived from sugarcane bagasse (SB), eucalyptus forest residues (CE), castor meal (CM), green coconut pericarp (PC), and water hyacinth (WH) as candidate materials for the treatment of contaminated waters and soils. Solid-liquid distribution coefficients depended...

Anatase TiO2 is widely used for pollutant degradation due to its photocatalytic property. Exposure of the surface to UV radiation (sunlight or artificial) generates an electron-hole pair that is responsible for the formation of free radicals such as O2•− in the presence of atmospheric oxygen and HO• in the presence of water. Biomorphic TiO2 plates...

This work describes the construction and application of carbon paste electrodes modified with biochar and antimony microparticles (SbBCPE) for voltammetric determination of paraquat using a simple and sensitive procedure based on voltammetric stripping analysis. Some parameters such as amount of biochar and antimony used in the composition of the c...

The Northeast of Brazil, a semi-arid region, frequently experiences severe drought. Despite rainfall during two or three months of the year, the presence of soils with low water retention capacity, together with intense insolation, results in infiltration of water to deeper soil layers, rapid evaporation, and deficiency of water during the rest of...

The aim of this work was to evaluate the concentrations of polycyclic aromatic hydrocarbons (PAHs) in soils to which solid shale materials (SSMs) were added as soil conditioners. The SSMs were derived from the Petrosix® pyrolysis process developed by Petrobras (Brazil). An improved ultrasonic agitation method was used to extract the PAHs from the s...

The present work reports for the first time the determination of paraquat (PQ2+) by Differential Pulse Adsorptive Stripping Voltammetry (DPAdSV) using a carbon paste electrode modified (CPME) with biochar obtained from castor oil cake at different temperatures (200-600°C). The best voltammetric response was verified using biochar yielded at 400°C (...

Nanotechnology is an engineering science in which the aim is to develop novel procedures and structures at the nanoscale that might offer solutions to many current problems. In this article, we describe the synthesis of superparamagnetic iron oxide (Fe3O4) nanoparticles in biochar obtained from the condensed tannin extract of Acacia mearnsii, using...

A simple and sensitive electroanalytical method was developed for determination of nanomolar levels of Pb(II) based on the voltammetric stripping response at a carbon paste electrode modified with biochar (a special charcoal) and bismuth nanostructures (nBi-BchCPE). The proposed methodology was based on spontaneous interactions between the highly f...

This work describes for first time the use of biochar as electrode modifier in combination with differential pulse adsorptive stripping voltammetric (DPAdSV) techniques for preconcentration and determination of copper (II) ions in spirit drinks samples (Cachaça, Vodka, Gin and Tequila). Using the best set of the experimental conditions a linear res...

In the present work a modified carbon paste electrode (MCPE) was prepared using mercury ions (Hg2+) supported at a biochar (bio-charcoal) surface obtained from castor oil cake and used for electrode preparation. The proposed electrode was evaluated for preconcentration and determination of zinc(II) ions present in commercial samples (collyrium and...

A novel oilwell cement slurry was prepared with in situ polymerized epoxidized A/F bisphenol–chitosan and characterized by 29Si NMR and EPR spectroscopy. The hydrated and cured cement slurry evidenced the presence of unreacted clinker phases identified by the presence of orthosilicate groups along with the presence of hydration products identified...

AbstrAct In Brazil, Gmelina arborea is a common tree to produce char and the content of carbon is an important factor to correlate with the energy content or carbon sequestration capability, whereas Araucaria angustifolia occupies 6 % of its original territory and Brazilian laws protect old native specimens, since the commercial use of wood is rest...

Hidróxidos duplos lamelares (HDL) são intercaladores potenciais aniônicos. Com o objetivo de obter fertilizantes de liberação lenta de nitrato, foram sintetizados HDL com a fórmula geral [M2+1-xM3+x(OH)2]x-(NO3)x.yH2O, em que M2+ = Mg2+ e M3+ = Al3+ e, ou, Fe3+, utilizando-se o método de coprecipitação a pH alcalino constante. Medidas de difração d...

Layered double hydroxides (LDHs) are potential anionic intercalators. To obtain nitrate slow-release fertilizers, LDHs with the general formula [M1-x2+Mx3+(OH)(2)](x-)(NO3)(x center dot)yH(2)O (where M2+ = Mg2+ and M3+ = Al3+ and/or Fe3+) were synthesized by the method of co-precipitation at constant alkaline pH. The X-ray diffraction (XRD) measure...

eumelanin is an oligomeric pigment that has a high affinity for metal ions, which induces the formation of reactive oxygen species, causing melanoma cell apoptosis due to the acceleration of intracellular or extracellular oxidative stress. Melanin in the skin and in dark hair, known as eumelanin, has three main groups that serve as donors: carboxyl...

Charcoal is utilized in Brazil for the metallurgical industry. Small size pieces, called charcoal fines, are rejected and sometimes are used to produce energy by burning. This charcoal can be used as soil conditioner to improve retention of metal ions in soil. However, changing the charcoal's surface chemistry via oxidation may increase retention o...

Diante do extensivo uso de fertilizantes nitrogenados na agricultura e elevado potencial de lixiviação do nitrato, há uma demanda por fertilizantes de liberação lenta ou controlada. Os hidróxidos duplos lamelares (HDLs) sintéticos reúnem características que os qualifica para o uso como matrizes para fertilizantes de liberação lenta de íons nitrato....

News coagulants for water and sewage treatment are synthesized trough the chemical transformation of tannin extracts. Tanfloc® is a cationic polymeric coagulant produced from tannin extract of Acacia mearnsii. In this paper we are supporting the use of cationic polymeric coagulant for treatment of polluted water instead of aluminum or iron salts to...

Due to the extensive use of nitrogen fertilizers in the agriculture e due to the elevate potential of nitrate leaching, there is a great demand for slow or controlled release fertilizers. Synthetic layered double hydroxides (HDLs) combine the characteristic that qualifies them to be used as matrixes for nitrate slow release fertilizers. The objecti...

Oxidation of charcoal with nitric acid or with SeO2/H2O2 produced biochar, the material similar to the Indian black earth of the Amazon region. The Electron paramagnetic resonance (EPR) spectroscopy data indicate that the organic-free radical density of the prepared biochar is greater under the treatment of charcoal with SeO2/H2O2 than with nitric...

This work proposes the use of tree termite nest as an adsorbent for the reduction/removal of Cr(VI) present in aqueous solution. In laboratory experiments, adsorption of Cr(VI) was sensitive to pH in the range investigated (2-5), with maximum adsorption capacity achieved at pH 2 (3.70 ± 0.04 mg g(-1), representing 93.2% removal of Cr). The termite...

This work describes for first time the use of electroanalytical techniques for evaluation of adsorptive proprieties of biochar using it as electrode modifier and its application for preconcentration and determination of Lead(II) and Cadmium(II) under differential pulse adsorptive voltammetric conditions (DPAdSV). Samples of biochars were obtained f...

In this work, native forest soil (NFS) organic matter (SOM) sample and SOM samples from a neighboring forest soil area of an oil shale mine which is being rehabilitated for thirty years (RFS) were analyzed. X-band electron paramagnetic resonance (EPR) and solid-state 13C nuclear magnetic resonance (NMR) spectroscopies were used to evaluate the soil...

In this work, native forest soil (NFS) organic matter (SOM) sample and SOM samples from a neighboring forest soil area of an oil shale mine which is being rehabilitated for thirty years (RFS) were analyzed. X-band electron paramagnetic resonance (EPR) and solid-state 13C nuclear magnetic resonance (NMR) spectroscopies were used to evaluate the soil...

Two ozonation procedures for sunflower oils at different applied ozone dosages were carried out. Ozone was obtained from medicinal oxygen and from air. Peroxide, acidity, and iodine indexes, along with density, viscosity and antimicrobial activity were determined. The fatty acid compositions of the samples were analyzed using GC. The content of oxy...

The spectroscopic characteristics (DRIFT, UV-visible and EPR) of humic fractions were studied during composting of sawdust and paper mill sludge. Infrared spectroscopy reveals a compost rich in hydroxyl and alkyl groups and carboxylates and carbohydrates. The alkyl fraction is abundant in the humic acids and humin. The decreasing of the E4/E6 ratio...

p>The spectroscopic characteristics (DRIFT, UV-visible and EPR) of humic fractions were studied during composting of sawdust and paper mill sludge. Infrared spectroscopy reveals a compost rich in hydroxyl and alkyl groups and carboxylates and carbohydrates. The alkyl fraction is abundant in the humic acids and humin. The decreasing of the E4/E6 rat...

Pyrolysis is a thermal process of great importance in the present context, since it constitutes a significant alternative to adequate use of organic waste. The principal products obtained in the pyrolysis of discarded biomass are bio-oil, biogas and biochar. Biochar, in turn, may play a relevant role when applied to the soil to sequester carbon and...

The properties of melanins prepared from L-dopa oxidation by both chemical and electrochemical methods are reported, searching for a material with more intense optical absorption in the visible region. The characterization of the samples have been done by cyclic voltammetry (CV), cronoamperometry (CA), Fourier transformed infrared spectroscopy (FTI...

Zinc(II) and copper(II) complexes of a tridentate Mannich base L1 derived from 2-hydroxy-1,4-naphthoquinone, pyridinecarboxyaldehyde and 2-aminomethylpyridine, [ZnL1Cl(2)]·H(2)O 1 and [CuL1Cl(2)]·2H(2)O 2, have been synthesized and fully characterized. The structure of complex 1 has been elucidated by a single crystal X-ray diffraction study: the z...

We investigated some physicochemical properties of an amorphous Se(90)P(10) alloy produced by mechanical alloying through x-ray diffraction, Raman spectroscopy, optical absorption spectroscopy and EXAFS techniques. The total structure factor obtained from x-ray diffraction and the EXAFS χ(k) oscillations on the Se K edge were used in reverse Monte...

Herein we describe the syntheses, structures, and physicochemical characterization of two dinuclear [CuII(μ-alkoxo)(μ-OAc)CuII] complexes (1 and 2) containing unsymmetrical dinucleating ligands. In the solid state, the complexes reveal significant distinct antiferromagnetism, which is a function of the Cu−μ-Oalkoxo−Cu bridging angle. In mixed ethan...

The reduction of Cr(VI) to Cr(III) in aqueous solution, and the subsequent removal of Cr(III) using in natura peat or its humin fraction, was characterized by electron paramagnetic resonance (EPR), ultraviolet–visible (UV–Vis) spectroscopy and X-ray photoelectron (XPS) spectroscopy. EPR spectroscopy g-factors ranging from 2.0029 to 2.0030 indicated...

Recebido em 17/11/10; aceito em 11/7/11; publicado na web em 2/9/11 SPECTROSCOPIC STUDIES OF COMPOSITE OBTAINED FROM SOLID STATE REACTION BETWEEN A MONONUCLEAR VANADIUM(IV) COMPLEX AND KAOLINITE. The use of probes, such as paramagnetic species diluted in diamagnetic materials in EPR spectroscopy, and mathematical tools such, as the Kubelka-Munk fun...

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)(BM...

Ternary systems of Cu(II) with phosphocreatine (PCr) and the polyamines (PAs), ethylenediamine (en), 1,3-diaminopropane (tn), putrescine (Put), spermidine (Spd), and spermine (Spm), were investigated in aqueous solution through potentiometry, ultraviolet-visible, EPR and Raman spectroscopy. The binary complex CuPCr was also studied by Raman spectro...

The traditional answer to the question of controlling the growth of global warming involves reducing emissions of greenhouse gases like CO 2. However, developed and developing countries have difficulty in adopting measures to reduce use of fossil fuels in the short or medium term. The world is currently exceeding the rate of greenhouse gas emission...

Biodiesel is a key component for the establishment of a sustainable energy matrix. In this work, the main biodiesel production technologies are discussed in detail, with emphasis to those that are under investigation in the Brazilian INCT of Energy and Environment. Some of the most recent achievements in this field are presented, along with what is...

The maturity of the National Institute of Science and Technology in Energy and Environment (INCT E&A) to act in a complex and articulated way in all areas of science is portrayed in this article. Several extra-laboratory activities in the fields of education, extension, and popularization of science are shown. This commitment is exemplified by "The...

O emprego de sistemas agrossilvipastoris tem sido importante estratégia de uso de solos, principalmente arenosos pertencentes ao bioma Pampa. Objetivou-se, neste estudo, avaliar a agregação, o teor de C orgânico total (COT) e de N total (NT), o teor de C nas frações físicas e o grau de humificação da MO em um Argissolo Vermelho eutrófico arênico su...

Electron paramagnetic resonance (EPR) spectroscopy and optical analyses of intensively weathered soils containing high levels of oxide-hydroxide of iron from a pilot project on precision agriculture, including 13 farms in the southwest of Paraná state, Brazil, were carried out, aiming at defining parameters of soil fertility. The results of the opt...

Espécies aniônicas absorvedoras de radiação ultravioleta (UV) (4-metoxibenzoato, N-acetilantranilato, 4-metoxicinamato e 4,4'-diamino-2,2'-estilbenodissulfonato) foram intercaladas em hidroxinitrato de zinco pelo método de co-precipitação ou reação de troca aniônica topotática. A intercalação foi confirmada por difratometria de raios X de pó (XRPD)...

Cientistas do mundo inteiro pesquisam bons processos que permitam armazenar – no jargão técnico, ‘sequestrar’ – carbono no solo, para evitar que esse elemento seja liberado na atmosfera e colabore para o aquecimento global. A presença de matéria orgânica no solo, além de reter carbono com eficácia, é essencial para aumentar sua fertilidade. Isso é...

The Brazilian oil shale byproducts resulting from the Petrosix pyrolysis (retortage) process were submitted to a set of analytical techniques to evaluate their possible use as agricultural soil conditioners. Liquid dichloromethane extracts from the solid samples were analyzed using capillary column gas chromatography–mass spectrometry. The results...

The understanding of soil carbon stabilization processes can be very useful in the development of mitigation techniques for CO2 emissions and global warming. The greater the hydrophobicity of soil organic matter the more stabilized soil organic carbon. Therefore, hydrophobicity can be a sensitive index to characterize the ‘quality’ of soil organic...

A novel versatile tridentate 3-(aminomethyl)naphthoquinone proligand, 3-[N-(2-pyridylmethyl)aminobenzyl]-2-hydroxy-1,4-naphthoquinone (HL), was obtained from the Mannich reaction of 2-hydroxy-1,4-naphthoquinone (Lawsone) with 2-aminomethylpyridine (amp) and benzaldehyde. The reactions of HL with CuCl2·2H2O yielded two novel dinuclear copper(II) com...

!-- @page { margin: 2cm } P { margin-bottom: 0.21cm } --> The understanding of soil carbon stabilization processes can be very useful in the development of mitigation techniques for CO2 emissions and global warming. The greater the hydrophobicity of soil organic matter the more stabilized soil organic carbon. Therefore, hydrophobicity can be a sens...

Four new ternary complexes of Cu(II) containing aspartic or glutamic acids and methionine or cysteine as ligands were studied both in solution and in solid state. The solution study was performed using potentiometry, UV-Vis spectroscopy, electron paramagnetic resonance (EPR) spectroscopy, and electrochemistry. The stability constants of the ternary...

The reaction between p-benzoquinone (PBQ) and casein (protein) in the solid state was studied. After reaction with protein, the FT-IR spectra showed a new band at 1215 cm(-1), with an intense sign attributed for casein/PBQ product. An optimum amount of PBQ for determination of the product when mixed with casein was 100mg and a reaction time of 30 m...