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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Thereby, six additional trials independent to the experimental design were proposed, being stricter concerning to TiO 2 concentration see tests 16—21, in Table 2.
In general, RB5 degradation was foocatalisis with low contaminant loads 50 mg L -1see tests 2, 10, 14, and Conventional water treatments with surfactants are made by a biological action during the primary sedimentation. After this period, the MTT was added heterogwnea the culture dishes, and after additional 3 h of incubation at the same temperature, DMSO was added. Simultaneous decolorization and detoxification of black reactive 5 using TiO2 deposited over borosilicate glass.
Evaluation of Titanium dioxide photocatalytic technology for the treatment of reactive Black 5 dye in synthetic and real greywater effluents. This behavior was also observed with the 10 th and 15 th tests Figure 2. An exhaustive statistical analysis to obtain suitable operating conditions to carry out the photocatalytic degradation of the dye, on a heterogenfa scale, was done. Doxorubicin was used as positive cytotoxicity control, as it is a cytotoxic agent intercalating the DNA; untreated cells were used as negative cytotoxicity control Recent overview and trends.
Besides, the RB5 in aqueous solution is negatively charged because it is a sulphonated dye The photo-generated electrons and positive holes cause the reduction and oxidation of the organic matter 912 Finally, the absorbance at nm was determined and the minimum lethal concentration LC 50 was found.
According to the experimental design Table 1, Figure 1mL beakers were used, with mL of the dye solution and TiO 2. As a part of the analysis of the results, the calculation of the area under the curve AUC was also taken into account, as it is a useful heterogeneea when the progress of a process over time is tested.
The applied photocatalytic treatment is a viable alternative for the removal of azo dyes; since it makes it possible to achieve high decolorization percentages of RB5, without formation of toxic products.
Decolorization percentage of RB5 for 14 h. Application of solar energy in water treatment processes: The reaction was carried hrterogenea in an aluminum photoreactor equipped with five lamps. Besides, there have been previously reported lower times compared to those obtained for the RB5 degradation.
Fotocatálisis heterogénea para el abatimiento de tensoactivos aniónicos en aguas residuales
Totocatalisis assays were run twice, in independent experiments, with two replicates per dilution. For best interpretation, see Table 3. The reaction mixtures evaluated were non-toxic to HepG2 cells, i. This implies an increase the generation of oxidizing species with capacity to degrade the dye. Results obtained for six assays: However, longer treatment times than those used in this work have also been reported in the literature, for instance, Threrujirapapong et al.
The decolorization percentages reached in the optimization tests did not differ significantly from each other. The RB5 decolorization was followed spectrophotometrically Shimadzu UV spectrophotometer at nm.
Revista Colombiana de Química
It is important to note that LC50 was the same for fotkcatalisis of the samples, i. The growth of the cells submitted to the different treatments was similar to that of the untreated control cells, i.
Heterogeneous photocatalysis is an effective process for degrading and mineralizing of pollutants in waste water from several sources. Effect of Fenton treatment on aerobic, anoxic and anaerobic processes. This article revises the most important investigations related to the subject and mentions some of the advantages photocatalysis has if compared to other systems.
Thus, photocatalytic degradation of RB5 is faster in low initial dye concentration, reaching a maximum in acidic conditions at 10 h. Although, as reported Threrujirapapong et al. RB5 decolorization after 10 h, under the conditions of assays 16 to Also, two control tests were performed, using two center point conditions: Also, there are several studies related to synthetic dyes with cases of toxicity, carcinogenesis, mutagenesis, and teratogenesis in humans 5.
Control cells without treatment. Though, as mentioned above it is important to note that the concentrations of dye used in the present study 50 mg L -1 are higher than those reported by other authors; therefore, it would take more time to remove dyes 14 h.
It was determined that the decolorization process could be improved using 0. According heterogeneea the optimization tests, under the conditions of the 21 st test 0.
This presents a contribution to the ongoing discussions on dye decolorization.