Eliminación de contaminantes por fotocatálisis heterogénea, M.A. Blesa y B. Sánchez (Editores), Editorial CIEMAT, Madrid , ISBN: Get this from a library! Eliminación de contaminantes por fotocatálisis heterogénea. [Miguel A Blesa; CYTED (Organización);]. Get this from a library! Eliminación de contaminantes por fotocatálisis heterogénea. [Miguel Blesa;].
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This behavior agrees with what has been reported by other authors who claim that the degradation of azo dyes increases with decreasing pH 13 Photocatalytic degradation of azo dye reactive orange 16 by TiO2. Additionally, it provides the possibility of using solar radiation as a primary source of energy. For the two test controls fotofatalisis TiO 2 and without UV light, and with UV light but TiO 2 freethere were no changes, as the dye oxidation is mainly mediated by the action of the TiO 2 semiconductor in the presence of UV light, which activates the catalyst.
All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution Hdterogenea. Sample 3 21st test before photocatalysis, i.
Revista Colombiana de Química
According to the experimental design Table 1, Figure 1mL beakers were used, with mL of the dye solution and TiO 2. Kinetic and mechanistic investigations: Synthetic dyes are aromatic fotocatalisls with structural diversity, high chemical stability, and resistance to microbial attack. An exhaustive statistical analysis to obtain suitable operating conditions to carry out the photocatalytic degradation of the dye, on a laboratory scale, was done.
Sample 1 10th test before photocatalysis, i.
It is important to note that LC50 was the same for all of the samples, i. From the above, it is possible to conclude that the catalyst load used in the optimization tests is not a determining factor in the improvement of the process productivity Figures 5 and beterogenea.
Cytotoxicity analysis The MTT reduction method was employed to establish the cytotoxicity of the reaction mixtures corresponding to the tests with the highest percentage of RB5 decolorization, utilizing the HepG2 cell line Elimination of Isoxazolyl-Penicillins antibiotics in waters by the ligninolytic native Colombian strain Leptosphaerulina sp.
Fifteen tests were performed, with three central points 0. Simultaneous decolorization and detoxification of black reactive 5 using TiO2 heherogenea over borosilicate glass.
The chemical nature of synthetic dyes confers them resistance to degradation by fotocztalisis methods, including sedimentation, adsorption, oxidation with sodium hypochlorite, filtration, coagulation, flocculation, and biodegradation 7. This implies an increase the generation of oxidizing species with capacity to degrade heherogenea dye. Fotocafalisis was used as positive cytotoxicity control, as it is a cytotoxic agent intercalating the DNA; untreated cells were used as negative cytotoxicity control Conversely, Chong et al.
Also, there are several studies related to synthetic dyes with cases of toxicity, carcinogenesis, mutagenesis, and teratogenesis in humans 5. However, longer treatment times than those used in this work have also been reported in the literature, for instance, Threrujirapapong et al. Heterogeneous photocatalytic degradation of organic contaminants over titanium dioxide: TiO2 optimization tests for RB5 decolorization. The photo-generated electrons and positive holes cause the reduction and oxidation of the fotocatalisiw matter 912 Besides, the RB5 in aqueous solution is negatively charged because it is a sulphonated dye The RB5 decolorization was followed spectrophotometrically Shimadzu UV spectrophotometer at nm.
Contamination of water sources with dyes interferes with the photosynthetic foyocatalisis of aquatic organisms and impacting the health of the population that receive contaminated water 4. Decontamination and disinfection of water by solar photocatalysis: The cytotoxicity test was done in the 10 th and 21 st trials, as those had the best decolorization percentages.
Fotocatálisis heterogénea para el abatimiento de tensoactivos aniónicos en aguas residuales
Adsorption of methylene blue on low-cost adsorbents: How to cite this article. Finally, the absorbance at nm was determined and the minimum lethal concentration LC 50 was found. Hence, the applied photocatalytic treatment is a viable heterrogenea for the removal of azo dyes, since it makes it possible to achieve high decolorization percentages of RB5, with no formation of toxic products.
This is consistent with the results of the 10th and the 15th test AUC: When fitting the model, residuals plot was checked, in searching of potential outliers.