Journal of Electrochemical Science and Engineering, 2022
In this research work, the corrosion resistance of plate steel used in the construction of cylind... more In this research work, the corrosion resistance of plate steel used in the construction of cylindrical container tanks of seawater was evaluated. These container tanks are usually used for fighting fires on the coast of the Arequipa-Peru region, where the shortage of drinking water is significant. The study was based on immersion tests of 2 × 2 cm square test plates in 3.5 wt.% NaCl solution. Five paint systems were studied, varying only in the primers: P1-860 (inorganic zinc silicate); P1-ZC (epoxy-zinchromate); P1-850 (organic rich in zinc); P1-600 (reinforced inorganic zinc) and P1-SP1000 (high solids epoxy-amine). All systems consisted of a primer coat, an epoxy middle coat and a polyurethane topcoat. To characterize the behaviour of each system, the electrochemical impedance spectroscopy (EIS) was mostly used. In addition, the scanning Kelvin probe (SKP) and scanning electrochemical microscopy (SECM) were used as local techniques. The first three paint systems (P1-860, P1-ZC ...
This current work has focused on the evaluation of the hexavalent chromium – Cr (VI) adsorption c... more This current work has focused on the evaluation of the hexavalent chromium – Cr (VI) adsorption carried out by a biocomposite based on rice husk and chitosan. The chromium IV is an agro industrial contaminant residual while chitosan is a natural biopolymer with a great adsorption of heavy metals. Conditions for the biosorption such as concentrations of rice husk and Cr (VI) alongside the contact time, were identified in order to achieve the highest biosorpion of the heavy metal – Cr (VI). The morphology of rice husk, carried out in a Scanning Electron Microscopy (SEM), showed a porous surface which can allow the adherence of chitosan. Different concentrations of rice husk (10, 20, 30, 40, 50 ) were used for the synthesis of the biopolymer. Furthermore, the capacity of Cr (VI) adsorption of the biocomposite based on rice husk and chitosan was evaluated throughout the contact time, resulting in a 68.28 % of Cr (IV) removal at 120 minutes. Additionally, the results of the experimental ...
In this study, the degree of acetylation (DA) and degree of deacetylation (DDA) were determined b... more In this study, the degree of acetylation (DA) and degree of deacetylation (DDA) were determined by Fourier Transform Infrared Spectroscopy (FT-IR) analysis, and their viability was evaluated by the cytocompatibility test with L132 epithelial cells, from samples of chitin and chitosan extracted of Cryphiops caementarius. FT-IR measurements resulted in the successful determination of DA and DDA. Particularly the results showed that, the chitosan CHT-C has the highest DDA (93%), while viability tests employed to determine the cytotoxicity of chitin and chitosan showed that the cell survival rate of CH-C and CHT-C are 130% and 75% respectively while commercial CHT has a rate of 80% approximately, demonstrating that the CH-C (chitin) a favorable behavior against L132 cell.
Proceedings of the 19th LACCEI International Multi-Conference for Engineering, Education, and Technology: “Prospective and trends in technology and skills for sustainable social development” “Leveraging emerging technologies to construct the future”, 2021
Todo estudioso que se interese en la estructura social de las sociedades de la América española c... more Todo estudioso que se interese en la estructura social de las sociedades de la América española colonial, se ve rápidamente confrontado con la representación tradicional de los diversos elementos que la componían, representación en la que a cada grupo, en función de su adscripción "étnica", le correspondía un determinado lugar en la organización social colonial. Así, los Españoles -y sus descendientes criollos-constituían la cima de la pirámide social, dominando a todos los otros grupos, indios, mestizos, negros y mulatos.
Journal of Electrochemical Science and Engineering, 2022
In this research work, the corrosion resistance of plate steel used in the construction of cylind... more In this research work, the corrosion resistance of plate steel used in the construction of cylindrical container tanks of seawater was evaluated. These container tanks are usually used for fighting fires on the coast of the Arequipa-Peru region, where the shortage of drinking water is significant. The study was based on immersion tests of 2 × 2 cm square test plates in 3.5 wt.% NaCl solution. Five paint systems were studied, varying only in the primers: P1-860 (inorganic zinc silicate); P1-ZC (epoxy-zinchromate); P1-850 (organic rich in zinc); P1-600 (reinforced inorganic zinc) and P1-SP1000 (high solids epoxy-amine). All systems consisted of a primer coat, an epoxy middle coat and a polyurethane topcoat. To characterize the behaviour of each system, the electrochemical impedance spectroscopy (EIS) was mostly used. In addition, the scanning Kelvin probe (SKP) and scanning electrochemical microscopy (SECM) were used as local techniques. The first three paint systems (P1-860, P1-ZC ...
This current work has focused on the evaluation of the hexavalent chromium – Cr (VI) adsorption c... more This current work has focused on the evaluation of the hexavalent chromium – Cr (VI) adsorption carried out by a biocomposite based on rice husk and chitosan. The chromium IV is an agro industrial contaminant residual while chitosan is a natural biopolymer with a great adsorption of heavy metals. Conditions for the biosorption such as concentrations of rice husk and Cr (VI) alongside the contact time, were identified in order to achieve the highest biosorpion of the heavy metal – Cr (VI). The morphology of rice husk, carried out in a Scanning Electron Microscopy (SEM), showed a porous surface which can allow the adherence of chitosan. Different concentrations of rice husk (10, 20, 30, 40, 50 ) were used for the synthesis of the biopolymer. Furthermore, the capacity of Cr (VI) adsorption of the biocomposite based on rice husk and chitosan was evaluated throughout the contact time, resulting in a 68.28 % of Cr (IV) removal at 120 minutes. Additionally, the results of the experimental ...
In this study, the degree of acetylation (DA) and degree of deacetylation (DDA) were determined b... more In this study, the degree of acetylation (DA) and degree of deacetylation (DDA) were determined by Fourier Transform Infrared Spectroscopy (FT-IR) analysis, and their viability was evaluated by the cytocompatibility test with L132 epithelial cells, from samples of chitin and chitosan extracted of Cryphiops caementarius. FT-IR measurements resulted in the successful determination of DA and DDA. Particularly the results showed that, the chitosan CHT-C has the highest DDA (93%), while viability tests employed to determine the cytotoxicity of chitin and chitosan showed that the cell survival rate of CH-C and CHT-C are 130% and 75% respectively while commercial CHT has a rate of 80% approximately, demonstrating that the CH-C (chitin) a favorable behavior against L132 cell.
Proceedings of the 19th LACCEI International Multi-Conference for Engineering, Education, and Technology: “Prospective and trends in technology and skills for sustainable social development” “Leveraging emerging technologies to construct the future”, 2021
Todo estudioso que se interese en la estructura social de las sociedades de la América española c... more Todo estudioso que se interese en la estructura social de las sociedades de la América española colonial, se ve rápidamente confrontado con la representación tradicional de los diversos elementos que la componían, representación en la que a cada grupo, en función de su adscripción "étnica", le correspondía un determinado lugar en la organización social colonial. Así, los Españoles -y sus descendientes criollos-constituían la cima de la pirámide social, dominando a todos los otros grupos, indios, mestizos, negros y mulatos.
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