Mercedes Tierno Nicolás - Academia.edu (original) (raw)
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Papers by Mercedes Tierno Nicolás
Journal of Environmental Management, 2016
Oxone ® (potassium monopersulfate, MPS) has been used to oxidize the herbicide tembotrione in aqu... more Oxone ® (potassium monopersulfate, MPS) has been used to oxidize the herbicide tembotrione in aqueous solution. Tembotrione elimination kinetics by MPS direct oxidation has been studied. The influence of the main operating variables affecting the process (MPS concentration, temperature and pH) has been evaluated. The process follows 2/3 and first orders in MPS and tembotrione concentrations, respectively. Optimal pH is located around circumneutral conditions. MPS decomposition in the presence of 365 nm UVA radiation and titanium dioxide has also been studied. A kinetic mechanism that simulates MPS decomposition has been proposed, showing the positive effect of titania load and MPS concentration. The system MPS/UVA/TiO 2 significantly improves tembotrione and mineralization rate abatement if compared to runs conducted in the absence of MPS. Tembotrione total abatement was achieved in 20 min when 0.05 g L À1 of titania and 10 À4 M of Oxone ® were used. TOC conversion was roughly 70% in 90 min under similar operating conditions. An experimental design (Plackett-Burman) has been considered to study the influence of the main variables affecting tembotrione photocatalytic oxidation promoted by MPS.
espanolEl proyecto de tesis que se presenta se ha dividido en dos partes diferenciadas con un pun... more espanolEl proyecto de tesis que se presenta se ha dividido en dos partes diferenciadas con un punto en comun que son los procesos de fotocatalisis. En la primera parte se ha desarrollado un programa de simulacion del reactor fotocatalitico en lenguaje FORTRAN. La ecuacion de transferencia de radiacion se ha resuelto mediante un algoritmo estocastico basado en Monte Carlo. Los valores teoricos de absorcion de fotones por parte del fotocatalizador han sido comparados con los experimentales ajustando los parametros caracteristicos del proceso fotocatalitico. Una vez obtenido el modelo de radiacion, los resultados han sido comparados con los obtenidos en la fotocatalisis de un compuesto modelo como es el acido dicloroacetico. En la segunda parte de este proyecto de tesis se han aplicado diferentes sistemas en la eliminacion de hidrocarburos aromaticos polinucleares (PAHs) disueltos en agua. En una primera instancia se estudio la fotolisis directa en presencia de radiacion a 365 nm y en ...
Journal of Environmental Management, 2016
Oxone ® (potassium monopersulfate, MPS) has been used to oxidize the herbicide tembotrione in aqu... more Oxone ® (potassium monopersulfate, MPS) has been used to oxidize the herbicide tembotrione in aqueous solution. Tembotrione elimination kinetics by MPS direct oxidation has been studied. The influence of the main operating variables affecting the process (MPS concentration, temperature and pH) has been evaluated. The process follows 2/3 and first orders in MPS and tembotrione concentrations, respectively. Optimal pH is located around circumneutral conditions. MPS decomposition in the presence of 365 nm UVA radiation and titanium dioxide has also been studied. A kinetic mechanism that simulates MPS decomposition has been proposed, showing the positive effect of titania load and MPS concentration. The system MPS/UVA/TiO 2 significantly improves tembotrione and mineralization rate abatement if compared to runs conducted in the absence of MPS. Tembotrione total abatement was achieved in 20 min when 0.05 g L À1 of titania and 10 À4 M of Oxone ® were used. TOC conversion was roughly 70% in 90 min under similar operating conditions. An experimental design (Plackett-Burman) has been considered to study the influence of the main variables affecting tembotrione photocatalytic oxidation promoted by MPS.
espanolEl proyecto de tesis que se presenta se ha dividido en dos partes diferenciadas con un pun... more espanolEl proyecto de tesis que se presenta se ha dividido en dos partes diferenciadas con un punto en comun que son los procesos de fotocatalisis. En la primera parte se ha desarrollado un programa de simulacion del reactor fotocatalitico en lenguaje FORTRAN. La ecuacion de transferencia de radiacion se ha resuelto mediante un algoritmo estocastico basado en Monte Carlo. Los valores teoricos de absorcion de fotones por parte del fotocatalizador han sido comparados con los experimentales ajustando los parametros caracteristicos del proceso fotocatalitico. Una vez obtenido el modelo de radiacion, los resultados han sido comparados con los obtenidos en la fotocatalisis de un compuesto modelo como es el acido dicloroacetico. En la segunda parte de este proyecto de tesis se han aplicado diferentes sistemas en la eliminacion de hidrocarburos aromaticos polinucleares (PAHs) disueltos en agua. En una primera instancia se estudio la fotolisis directa en presencia de radiacion a 365 nm y en ...