Degradação de sulfeto de hidrogênio utilizando tinta fotocatalítica

• Main Author: Custodio, Pamella
• Publication Date: 2019
• Format: Bachelor thesis
• Language: por
• Source: Repositório Institucional da UTFPR (da Universidade Tecnológica Federal do Paraná (RIUT))
• Download full: http://repositorio.utfpr.edu.br/jspui/handle/1/12535
• topic: Sulfeto de hidrogênio; Catálise; Lâmpadas de LED; Hydrogen sulphide; Catalysis; LED lamps; CNPQ::ENGENHARIAS::ENGENHARIA SANITARIA::SANEAMENTO AMBIENTAL

The hydrogen sulphide (H2S) is a toxic, corrosive, colorless gas with the characteristic odor of a rotten egg, released in several industrial processes. This gas can be treated by non-conventional methods from the advanced oxidative processes (POAs) based on the generation of hydroxyl radicals (OH-), which promote the degradation of various gaseous pollutants. In this work the effects of the physical, chemical, textural and morphological characteristics of the fiber cement plates were evaluated, which were synthesized with different masses of photocatalytic paint, and investigated the influence of the source of UV and LED radiation on the degradation efficiency of H2S. The 5 mm x 5 mm fiber cement plates were followed for characterization analysis and were impregnated with a pipette, while the 15 cm x 3.5 cm plates followed the experimental test and were impregnated with a vaporizer. The results showed that in the measurement of the photocatalytic activity using UV and LED lamps, the concentrations of H2S gradually decreased over time after the start of irradiation. With UV light it was identified that the degradation efficiency increased until reaching the percentage of 2.22% of mass of the ink, which was equivalent to 80% efficiency in the degradation of H2S.The linear adjustment to the first order model showed that there is no interval of R2 = 0.90 to 0.94. The upper value of the rate of exposure under UV irradiation is 7.8.10-1 min -1 for a 2.62% sample. Regarding the use of the lamp, the LED was a level of degradation efficiency between the 2.21% and 2.44% that was equivalent to 30% efficiency. The linear fit to the first order model showed that there is no interval of R2 = 0.62 to 0.99. The highest value of reaction rate under LED irradiance at 5.8.10-2 min-1 for a 2.44% sample. UV-Vis spectroscopy indicated the maximum wavelength of absorbance of 266 nm, therefore the TiO2 pigment presented a solution of higher voltage in the ultraviolet radiation range. From the BET analysis they were separated by pore diameters equal to 3.7 to 4.2 nm, classified as mesoporous materials, and as isotherms as type IV. The date was sufficient to significantly modify the textual characteristics, such as porosity and surface, in order to influence a photocatalytic activity. X-ray diffraction (XRD) identified a characteristic peak formation of the TiO2-anatase phase.