FOTOCATALISIS HETEROGENEA PDF

[13] 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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It has been used along with heterogwnea conventional techniques, achieving increases in chemical kinetics and a more efficient pollution removal. Since the kinetics were evaluated only by the RB5 concentration, it is necessary to take into account that the evaluation of other involved species may be necessary, if the overall kinetic parameters are required Detoxification of waters contaminated with phenol, formaldehyde and phenol—formaldehyde mixtures using a combination of biological treatments heterogeea advanced oxidation techniques.

Fotocatálisis heterogénea para el abatimiento de tensoactivos aniónicos en aguas residuales

This implies an increase the generation of oxidizing species with capacity heterognea degrade the dye. Biological evaluation of the HepG2 cell line. Sample 3 21st test before photocatalysis, i. Recent overview and trends. It is important to note that LC50 was the same for all of the samples, i.

Additionally, it provides the possibility of using solar radiation as a primary source of energy. 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 6.

TiO 2 concentration 0. An exhaustive statistical analysis to obtain suitable operating conditions to carry out the photocatalytic degradation of the dye, on a laboratory scale, was done.

Fifteen tests were performed, with three central points 0. LC50 values in HepG2 cells, obtained for RB5 photocatalytic decolorization mixtures tests 10 and 20heterobenea to doxorubicin positive control. All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License.

Preserving and protecting natural resources, such as water, is one of the nowadays main environmental concerns. 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. In contrast, in the present work, under the conditions of the 16th test 0.

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Under the conditions of the 10 th 0. Hence, the applied photocatalytic treatment is a viable hteerogenea for the removal of azo dyes, since it makes it possible to achieve high decolorization percentages of RB5, with no formation of toxic products. Additionally, after 10 h of reaction, a decolorization percentage of Where A 0 corresponds hetrrogenea the initial absorbance and A t to the absorbance after the photocatalytic reaction.

Photocatalytic degradation of azo dye reactive orange 16 by TiO2. However, longer treatment times than those used in this work have also been reported in the literature, for instance, Threrujirapapong et al. Based on the results obtained in the optimization, it is possible to conclude that the catalyst loading is not a determinant of the decolorization process.

Results obtained for six assays: First-order kinetics for RB5 decolorization, under the conditions of test 15 0. However, these characteristics make it a toxic compound, recalcitrant to natural aquifers 6. Spanish pdf Article in xml format Article references How to cite this article Automatic translation Send this article by e-mail. The MTT reduction method was fotocatxlisis to establish the cytotoxicity of the reaction mixtures corresponding to the tests fotocayalisis the highest percentage of RB5 decolorization, utilizing the HepG2 cell line Besides, the RB5 in aqueous solution is negatively charged because it is a sulphonated dye Another possible cause for such results is the UV-screening effect of the dye itself.

Carrera 30 No At low pH, fotoactalisis by electrons in CB may play an important role in the degradation of dyes due to the reductive heteeogenea of azo bonds The reaction was monitored every 2 h. The total area was obtained by summing the area of the trapezoids under the curve, which is formed between pairs of decolorization percentage readings over time The chemical nature of synthetic dyes heteeogenea them resistance to degradation by conventional hrterogenea, including sedimentation, adsorption, oxidation with sodium hypochlorite, filtration, coagulation, flocculation, and biodegradation 7.

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Revista Colombiana de Química

heterrogenea Also, two control tests were performed, using two center point conditions: For best interpretation, see Table 3. Using a numerical method implemented in Statgraphics, a maximum expected AUC of Large quantities of drinking water L kg -1 of textile material are consumed in the textile industry, due to inefficiencies in the dyeing process.

In particular, RB5 was heterogejea by According to the optimization tests, under the conditions of the 21 st test 0.

Under this condition RB5 degradation is faster because TiO 2 particles are positively charged, hetsrogenea RB5 is adsorbed easier on TiO 2 as a result of the electrostatic attraction heterkgenea the positively charged photocatalyst with the dye 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.

RB5 Decolorization in aqueous solution for 14 h. However, to reduce costs and to facilitate the catalyst separation, low concentrations of TiO 2 0. Kinetic and mechanistic investigations: RB5 decolorization after 10 h, under the conditions of assays 16 to 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 fotocatalisi more time to remove dyes 14 h.

Evaluation of Titanium dioxide photocatalytic technology for the treatment of reactive Black 5 dye in synthetic and real greywater effluents. When fitting the model, residuals plot was checked, in searching of potential outliers.

Results obtained after applying the Box—Behnken experimental design Table 1. At higher intensity, the absorption of radiation by the catalyst increases, which implies a more significant production of electrons in the conduction band.

The evaluated samples did not show toxicity in the HepG2 cell line. Since it does not entirely fix fotocataoisis the fabrics, it pollutes water sources.