Artículos de revistas
Optimization by factorial design of copper (II) and toxicity removal using a photocatalytic process with TiO 2 as semiconductor
Registro en:
Chemical Engineering Journal 152
1385-8947
Autor
Yeber, María Cristina
Soto, Carolina
Riveros, Ruby
Navarrete, Joselyn
Vidal, Gladys
Resumen
Artículo de publicación ISI The photochemical process of Cu (II) reduction by heterogeneous photocatalysis using titanium dioxide (TiO2) Degussa P-25 and a 254 nm UV-C lamp was studied. The aim of this work was to determine the efficiency of the photocatalytic process to remove 100 ppm of copper (II) ion concentration from a water solution. A statistics-based experimental design with response surface methodology (RSM) was employed to investigate the effect of operating conditions on photocatalytic reduction. The experimental results were evaluated using multivariate analysis with the program MODDE 7.0. The parameters studied were catalyst mass, pH, and reaction time. After optimizing the variables, degradation kinetics were performed to corroborate the model. The regression analysis withR2 value of 0.98 shows a close fit between the experimental results and the model predictions. The value obtained for the reaction rate constant was 0.0246 min−1. Three-dimensional response surface plots were used to visualize parameter interactions. The optimum pH (4.3) and titanium dioxide mass (0.5 g) achieved the highest efficiency, reaching 80% of copper (II) ion reduction. Two different bioassays, using Daphnia magna and Pseudomonas aeruginosa, were performed to determine acute toxicity reduction after the treatment. The results obtained show that the bio-toxicity reduction reached 80%