One of the pollutants that can be found in water bodies as a result of industrial activity is arsenic. Methods for the removal of this non-metal turn out to be inefficient and expensive. A new nanocomposite based on tara gum and magnetite nanoparticles was prepared for the removal of arsenic from water. The characterization of the nanocomposites prepared with different Fe3O4: tara gum ratios showed the presence of the magnetite phase by XRD and it was also measurement the particle size (13.74 nm) by TEM. The arsenic removal tests in water carried out with the nanocomposites with different magnetite content, pH variation and nanocomposite weight showed that the nanocomposite with 80% by weight of magnetite presented higher efficiency. The maximum values studied for arsenic concentration were 2 ppm, reaching 24.8% removal in 15 minutes of exposure using the nanocomposite with 80% magnetite...

sponce@ulima.edu.pe

SPONCE@ulima.edu.pe

sponce@ulima.edu.pe;agutarra@ulima.edu.pe

sponce@ulima.edu.pe; jrodriguez@uni.edu.pe; eacarpio@yahoo.es

En este trabajo se plantea el uso de los desechos de la producción de la goma de tara para la preparación de nanofibras de celulosa con el fin de mejorar las propiedades del papel reciclado. Se realizará la caracterización de las nanofibras con el fin de determinar su calidad y establecer la cantidad necesaria de estas nanofibras en relación con la pulpa para la obtención del papel reciclado. Las fibras de nanocelulosa podrían mejorar las propiedades físicas del papel reciclado, disminuyendo asimismo los costos de producción, ya que se obtendrían a partir de un desecho. Además permitiría darle un valor agregado a estos desechos de la tara, disminuyendo los costos de su almacenamiento, al darle un uso a este residuo, el cual no tiene aplicación actualmente. El proceso de producción de estos materiales es limpio ya que no agrega contaminantes al ambiente.

El proyecto plantea usar goma de tara con soporte de nanopartículas de Fe3O4 (NPs de magnetita), cuyas capacidades han sido probadas para remover el arsénico que se encuentra en el agua. Las nanopartículas que removieron el arsénico son, a su vez, retiradas mediante medios magnéticos, mientras que la goma de tara es biodegradada por bacterias, con lo cual se evitarían los riesgos de contaminación por arsénico.

sponce@ulima.edu.pe;jquinof@ulima.edu.pe;agutarra@ulima.edu.pe

One of the pollutants that can be found in water bodies as a result of industrial activity is arsenic. Methods for the removal of this non-metal turn out to be inefficient and expensive. A new nanocomposite based on tara gum and magnetite nanoparticles was prepared for the removal of arsenic from water. The characterization of the nanocomposites prepared with different Fe3O4: tara gum ratios showed the presence of the magnetite phase by XRD and it was also measurement the particle size (13.74 nm) by TEM. The arsenic removal tests in water carried out with the nanocomposites with different magnetite content, pH variation and nanocomposite weight showed that the nanocomposite with 80% by weight of magnetite presented higher efficiency. The maximum values studied for arsenic concentration were 2 ppm, reaching 24.8% removal in 15 minutes of exposure using the nanocomposite with 80% magnetite...

agutarra@ulima.edu.pe;sponce@ulima.edu.pe

Los problemas de conectividad al internet son un desafío crítico en el sector de las telecomunicaciones, especialmente para los clientes empresariales. Ellos, dado que se encuentran en constante crecimiento, dependen de un servicio robusto e ininterrumpido que contribuya a la continuidad del negocio y a la construcción de un mundo digital. Este estudio aborda las ineficiencias en la resolución de fallas que afectan la confiabilidad del servicio y la satisfacción del cliente en una empresa de telecomunicaciones peruana, mediante la implementación de las metodologías lean service y business process management (BPM) para reducir significativamente los tiempos de respuesta y resolución de fallas para mejorar la calidad del servicio de internet para los clientes empresariales. Aunque existen estudios sobre la aplicación de estas herramientas en diferentes sectores, incluido el de las...

Background and Objective: A previous study investigated the in vitro release of methylene blue (MB), a widely used cationic dye in biomedical applications, from nanocellulose/nanoporous silicon (NC/nPSi) composites under conditions simulating body fluids. The results showed that MB release rates varied significantly with the nPSi concentration in the composite, highlighting its potential for controlled drug delivery. To further analyze the relationship between diffusion dynamics and the MB concentration, this study developed a finite element (FE) method to solve Fick’s equations governing the drug delivery system. Methods: Release profiles of MB from NC/nPSi composites with varying nPSi concentrations (0%, 0.1%, 0.5%, and 1.0%) were experimentally measured in triplicate using phosphate-buffered saline (PBS) at 37 °C, pH 7.4, and 100 rpm. Mathematical models incorporating linear and q...

kvargas@inia.gob.pe;reyzagui@ulima.edu.pe;fparedes@ulima.edu.pe; sponce@ulima.edu.pe;jquino@ulima.edu.pe;esaetton@ulima.edu.pe

En este proyecto se ha diseñado y se está construyendo una unidad de tratamiento de agua con iones ferrato (VI), que permite descontaminar el agua que contiene metales pesados, arsénico y microorganismos patógenos. Además, se está implementando un sistema de riego por goteo automatizado, que mantenga el cultivo en capacidad de campo para su mejor desarrollo.

This paper focuses on the synthesis of cobalt ferrite nanoparticles by the sol–gel method and their photocatalytic activity to eliminate bacteria in aqueous media at two different scales: in a laboratory reactor and a solar pilot plant. Cobalt ferrite nanoparticles were prepared using Co(II) and Fe(II) salts as precursors and cetyltrimethyl ammonium bromide as a surfactant. The obtained nanoparticles were characterized by X-ray diffraction, scanning and transmission electron microscopy. Escherichia coli (E. coli) strain ATCC 22922 was used as model bacteria for contact biocidal analysis carried out by disk diffusion method and photocatalysis under an ultraviolet A (UV-A) lamp for laboratory analysis and solar radiation (radiation below 350 W/m2 in a typical cloudy day) for the pilot plant analysis. The results showed that cobalt ferrite nanoparticles have an average diameter of (36 ± ...

ZnO nanorods (ZnO NRs) were grown on ZnO seeded polyethylene tert-phtalate (PET) substrates obtained from recycled soda bottles at low temperatures (90 °C) from Zn2+ precursors in alkaline aqueous solution. The ZnO seeds were deposited on the PET substrates by spray gel (SG) or dip coating (DC) from a ZnO methanol sol. In the case of SG, the PET substrate was heated at 90 °C during the spray process. By the other hand the ZnO seed layers obtained by dip coating were heated at 90 °C or 130 °C for 10 minutes among coatings. Before seeding two procedures were made on PET surface for improving seed adhesion: 1) PET surface was mechanically roughened with sand paper 1200. 2) PET surface was chemically treated with a solution of NaOH in ethanol. The relationship between the microstructure of the ZnO NRs films as function of the PET surface treatment and the photocatalytic antibacterial act...

Este proyecto ha hecho posible el diseño, la construcción y la implementación de un reactor que concentra la radiación solar sobre un mezclador estático de acero impregnado con nanopartículas de óxido de titanio, para producir radicales hidroxilo que tienen efecto bactericida. Será aplicado en la desinfección de agua para el riego de cultivos hidropónicos.

ZnO nanorods (NRs) films, nitrogen-doped (ZnO:N), and ZnO doped with nitrogen and decorated with silver nanostructures (ZnO:N-Ag) NRs films were vertically supported on undoped and N doped ZnO seed layers by a wet chemical method. The obtained films were characterized structurally by X-ray diffraction. Morphological and elemental analysis was performed by scanning electron microscopy, including an energy dispersive X-ray spectroscopy facility and their optical properties by Ultraviolet-Visible Spectroscopy. Analysis performed in the NRs films showed that the nitrogen content in the seed layer strongly affected their structure and morphology. The mean diameter of ZnO NRs ranged from 70 to 190 nm. As the nitrogen content in the seed layer increased, the mean diameter of ZnO:N NRs increased from 132 to 250 nm and the diameter dispersion decreased. This diameter increase occurs simultaneousl...

A novel methodology was employed to prepare new nanocomposites with photocatalytic properties based on Ce-doped TiO2 nanoparticles arranged over a layered silicate. The catalysts were porous materials formed by exfoliated silicate layers surrounded by anatase nanoparticles. In this way, the anatase was doped by different amounts of Ce, yielding to catalysts with light absorption properties on the visible region. The photocatalytic behavior was tested for different reactions: adsorption and photocatalysis, showing outstanding and promising results for the removal of bacteria by using solar light as an energy source. The influence of the physicochemical properties of the catalyst and the reaction parameters will be studied in detail to manage new catalysts for the disinfection of drinking water.

jquinof@ulima.edu.pe;Jsanabri@ulima.edu.pe;fparedes@ulima.edu.pe;sponce@ulima.edu.pe;reyzagui@ulima.edu.pe;esaetton@ulima.edu.pe;hvillaga@ulima.edu.pe;jyacono@ulima.edu.pe