Search results for "Indústria química"
showing 4 items of 4 documents
Study of the chlorfenvinphos pesticide removal under different anodic materials and different reactor configuration.
2021
The present manuscript focuses on the study of the electrochemical oxidation of the insecticide Chlorfenvinphos (CVP). The assays were carried out under galvanostatic conditions using boron-doped diamond (BDD) and low-cost tin dioxide doped with antimony (Sb-doped SnO2) as anodes. The influence of the operating variables, such as applied current density, presence or absence of a cation-exchange membrane and concentration of supporting electrolyte, was discussed. The results revealed that the higher applied current density the higher degradation and mineralization of the insecticide for both anodes. The presence of the membrane and the highest concentration of Na2SO4 studied (0.1 M) as a sup…
Voltammetric and electrodeposition study for the recovery of antimony from effluents generated in the copper electrorefining process
2023
Antimony is a metalloid with limited availability as a primary resource, but it is commonly found as an impurity in effluents generated in the copper metallurgy. Thus, the development of clean and selective processes to recover antimony from these wastewaters would improve the sustainability of the copper production. In this work, an emulated effluent of the copper electrorefining industry that contains antimony and hydrochloric acid was characterized by means of voltammetric and electrodeposition tests using two different cell configurations: a static cell, and a dynamic cell with a rotating disk electrode (RDE). Voltammograms were obtained at varying hydrochloric acid and antimony concent…
Redox and guest tunable spin-crossover properties in a polymeric polyoxometalate
2023
A bifunctionalized polyoxometalate (POM), [V6O19(C16H15N6O)2]2−, which contains a redox active hexavanadate moiety covalently linked to two tridentate 2,6-bis(pyrazol-1-yl)pyridine (1-bpp) ligands, has been prepared and characterized. Reaction of this hybrid molecule with Fe(II) or Zn(II) ions produces crystalline neutral 1D networks of formula Fe[V6O19(C16H15N6O)2]·solv (2) and Zn[V6O19(C16H15N6O)2]·solv (3) (solv = solvent molecules). Magnetic properties of 2 show an abrupt spin-crossover (SCO) with the temperature, which can be induced by light irradiation at 10 K (Light-Induced Excited Spin-State Trapping, LIESST effect). Interestingly, this porous and flexible structure enables reversi…
Adsorción de impurezas del jugo clarificado de la industria azucarera mediante biomasa pirolizada.
2019
En este trabajo se prepararon dos adsorbentes a partir de la cáscara del fruto de Jatropha curcas, para evaluar su efectividad en la remoción de impurezas coloreadas presentes en el jugo clarificado obtenido del proceso de fabricación de azúcar de caña. Partiendo de la cáscara molida y tamizada (diámetro<2 mm) del fruto de Jatropha curcas se fabricaron dos pirolizados mediante deshidratación inicial con ácido concentrados (ácido sulfúricoy ácido fosfórico), y posterior pirólisis a 500 ºC. Se verificó, mediante análisis estadístico, que el PAF (elaborado por deshidratación con ácido fosfórico) eliminó el 47,4±1,8 % de las impurezas coloreadas, con respecto al 36,8±1,6 % eliminado por el PAS …