20 Result(s)
within
I. Gonzalez
Physical Chemistry
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Article
Influence of reduced graphene oxides (rGO) at different reduction stages as conductive additive in Li-ion batteries
The importance of graphene as an additive in lithium-ion battery (LIB) composite cathodes has been broadly recognized; however, the graphenic structure can exhibit different structural and chemical properties ...
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Modelling the transport of ions and electrochemical regeneration of the resin in a hybrid ion exchange/electrodialysis process for As(V) removal
This paper presents the 2D modeling of a laboratory scale ion exchange/electrodialysis (IXED) flow cell for removal of As(V) ions from water. The cell consists of a central compartment (DS) delimited by two an...
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Remarkable increase of paper strength by combining enzymatic cellulose nanofibers in bulk and TEMPO-oxidized nanofibers as coating
Cellulose nanofibers (CNF) have been proposed by several authors as a reinforcing additive for papermaking pulps; their use allows one to avoid mechanical refining of pulp fibers, which damages the fibers and ...
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Suitability of wheat straw semichemical pulp for the fabrication of lignocellulosic nanofibres and their application to papermaking slurries
The present work studies the feasibility of wheat soda pulp as a raw material for the fabrication of cellulose nanofibres and their application as an additive in papermaking. Wheat straws were cooked under alk...
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Improvement of deinked old newspaper/old magazine pulp suspensions by means of nanofibrillated cellulose addition
During their recycling, cellulosic fibres suffer irreversible damage caused by repeated wetting and drying cycles, beating stages and bleaching reactions. This damage decreases the mechanical properties of the...
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Preparation and characterization of Sb2O5-doped Ti/RuO2-ZrO2 for dye decolorization by means of active chlorine
Textile industry is one of the major generators of wastewaters containing recalcitrant compounds such as dyes that jeopardize public health and environment. Electro-oxidation is an alternative method for treat...
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Article
From paper to nanopaper: evolution of mechanical and physical properties
In the present work the evolution of physical and mechanical properties of papers and nanopapers is studied. Handsheets made of eucalyptus fibres reinforced with 0, 25, 50, 75 and 100 wt% of nanofibrillated ce...
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All-cellulose composites from unbleached hardwood kraft pulp reinforced with nanofibrillated cellulose
In the present work, nanofibrillated cellulose (NFC) from bleached eucalyptus pulp was prepared, characterized and used as reinforcement in an unbleached eucalyptus fiber matrix. First, the NFC was fabricated...
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Article
Effect of the combination of biobeating and NFC on the physico-mechanical properties of paper
The combined effect of enzymatic treatment (biobeating) and NFC addition on the mechanical and physical properties of a papermaking pulp suspension was investigated. The influence of pH, consistency of pulp an...
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Evaluation of lead removal from sandy soils using different electrolytes in electrokinetic experiments: prospective for remediation of a real site contaminated with mining wastes
The mixture of mining wastes with native soil has similarities with a low permeable porous structure in respect of electrical conductivity and adsorption capacity; therefore, electrokinetics appears as a suita...
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Electrokinetic treatment for clayed and sandy soils
Electrokinetic treatment has proven to be an attractive alternative to clean polluted soils. This friendly environmental procedure can be approached by a physicochemical model dealing with the oriented displac...
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EIS characterization of the evolution of calcium carbonate scaling in cooling systems in presence of inhibitors
Electrochemical impedance spectroscopy (EIS) was used to assess the relative effects of scaling and corrosion for steel electrodes in cooling water media and to obtain information on corrosion inhibition and s...
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Voltammetric evaluation of the electrode material on the oxidation of cyanide catalyzed by copper ions
The cyanide oxidation on vitreous carbon (VC), stainless steel 304 (SS 304) and titanium (Ti) was investigated through a voltammetric study of cyanide solutions also containing copper ions. Results showed that...
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Characterization of different allotropic forms of calcium carbonate scales on carbon steel by electrochemical impedance spectroscopy
Calcium carbonate scales with allotropic forms of aragonite, calcite and a mixture of both, were selectively induced onto carbon steel substrates in a synthetic cooling water. Electrochemical impedance spectro...
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Article
An integrated approach to evaluate the leaching behaviour of silver from sulfide concentrates
The leaching rates of two different mineral concentrates with the same silver content were investigated by cyanide leaching with silver phases identified by scanning electron microscopy (SEM) and electrochemic...
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Article
The influence of different surface conditions in the corrosion process of carbon steel in alkaline sour media
Different electrochemical methodologies were established to induce general corrosion and blistering on homogeneous and heterogeneous carbon steel surfaces similar to the corrosion damage in a catalytic oil ref...
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Electrochemical recovery of silver from cyanide leaching solutions
In the hydrometallurgy industry cyanide solutions are the most common leaching baths used during the extraction of metals such as silver and gold. After extraction, the solution containing various cyanide spec...
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An electrochemical study of gold cementation with zinc powder at low cyanide concentration in alkaline solutions
The half-reactions involved in gold cementation on zinc powder from low concentration alkaline cyanide solutions were studied in a steady state regime, employing electrodes of glassy carbon and graphite paste ...
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Electrodeposition of gold in ammoniacal medium: influence of substrate and temperature
Gold electrodeposition was studied on glassy carbon and platinum electrodes from Au(1) ammoniacal solution. The current transients obtained from potential step perturbations, show a typical metallic nucleation...
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Silver electrocrystallization from a nonpolluting aqueous leaching solution containing ammonia and chloride
Silver electrocrystallization from aqueous solutions at pH11, pC10 and pNH3 − 0.2, where Ag(NH3)2 − is the dominant Ag(i) species, has been studied. In spite of the complexities of this medium, the experimental r...
