Remoção do antibiótico ciprofloxacino em meio aquoso empregando biomassa de macrófita como biossorvente
Emerging microcontaminants have been the subject of studies in several studies. This, motivated by the uncertainties regarding the possible ecotoxicological effects on the ecosystems and their interactions with the environmental compartments. The class of antibiotics have been highlighted in this pa...
| Autor principal: | Milioli, Suelen Specht Calegaro |
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| Formato: | Trabalho de Conclusão de Curso (Graduação) |
| Idioma: | Português |
| Publicado em: |
Universidade Tecnológica Federal do Paraná
2020
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.utfpr.edu.br/jspui/handle/1/13240 |
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| Resumo: |
Emerging microcontaminants have been the subject of studies in several studies. This, motivated by the uncertainties regarding the possible ecotoxicological effects on the ecosystems and their interactions with the environmental compartments. The class of antibiotics have been highlighted in this particular scenario by the effect on the increase in microbial resistance, with a direct impact on human health. In this study we evaluated the removal of the antibiotic ciprofloxacin in aqueous medium by means of biosorption process. The biosorbent, the aquatic macrophyte Pistia stratiotes found in large volumes in the extension of the Itaipu Reservoir located in the city of São Miguel do Iguaçu, Paraná, was prepared using physical and chemical treatments. In order to optimize the adsorption process, we analyzed the interactions of the variables pH and Macrophyte Mass in the adsorptive process, using a complete factorial experimental design 2² with central points for an initial survey, subsequently Adjusted and applied to the 2² rotational Central Composite Experimental design (DCCR). The statistical evaluation was based on the analysis of variance (ANOVA) and the study of the lack of adjustment. The kinetics and isotherms of the process were evaluated using adsorption assays. The study indicated a better experimental condition in alkaline medium, with optimum yield for the treatment of biomass in KOH, pH 10,5 and 0,05 g of biomass, predicting a percentage of removal higher than 60%. The effect of the time of contact required to achieve the equilibrium between the phases was 20 hours, with adsorption capacity 12,8 mg.g-1 and the efficiency of 65% in the removal of the drug. It was verified that the adsorption of CIP by biomass follows the behavior described by the model of pseudo second order, presupposing the process by chemissorption. The model of the Langmuir isotherm that assumes the monolayer of adsorption is the best describes the adsorption process, where the equilibrium data were better adjusted for both temperatures of 25 and 35°C. The maximum amount of ciprofloxacin adsorbed by macrophyte biomass, qmax, 33 mg g-1, occurred at 25ºC, using the biomass treatment with KOH. It can be considered the promising result in terms of the use of macrophyte biomass for the biosorption of the antibiotic ciprofloxacin. |
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