01.1 - Graduação (Sede)
URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/2
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Resultados da Pesquisa
Item Biorremediação de corantes azo por cepas de Aspergillus isoladas do solo da caatinga(2023-04-19) Oliveira, Adriane Caroline Batista; Porto, Ana Lúcia Figueiredo; http://lattes.cnpq.br/4989617783837981; http://lattes.cnpq.br/3498440662001137Item Estudo da adsorção do corante amarelo de tartrazina em hidróxido duplo lamelar contendo níquel e alumínio(2023-09-22) Silva, Camilla Ferreira da; Barros, Ivoneide de Carvalho Lopes; http://lattes.cnpq.br/5272867419216787; http://lattes.cnpq.br/9913666540185102The inadequate dumping of effluents into rivers and seas by industries from different segments has caused great environmental impact and directly influenced different aquatic ecosystems. To remove these effluents, the most commonly used process is adsorption, which consists of retaining particles on the surface of solids. In this sense, this work proposed the kinetic study and other adsorption parameters of tatrazine yellow dye in aqueous solution. For this purpose, lamellar double hydroxides (LDH) containing Ni and Al in ratios 1; 0.5 and 0.25, named as HDL-Ni0,5Al0,5, HDL-Ni0,33Al0,67 e HDL-Ni0,2Al0,8 espectively, intercalated with the terephthalate anion, which were prepared via coprecipitation at pH controlled. HDL is a hydrotalcite-type compound with the general formula [M2+(1-x) M3+X (OH)-2]x+ A-x/n m.H2O .XRD results confirmed the formation of HDLs through (003) and (110) reflections, and the FTIR spectra showed characteristic hydroxyl bands between 3200-3600 cm-1, as well as absorption at 1600cm-1, and 800- 860 cm-1 related to the terephthalate anion. Furthermore, the Point of zero charge (PZC) was determined using the 11-point method, obtaining values of 5.51, 5.31 and 6.67 for HDL-Ni0,5Al0,5, HDL-Ni0,33Al0,67 e HDL-Ni0,2Al0,8. In analyzing the influence of the initial pH, the three HDLs produced demonstrated greater efficiency at an acidic pH equal to 2. Adsorption tests involving contact time demonstrated that HDLNi0,5Al0,5 and HDL-Ni0,33Al0,67 reached maximum dye removal, reaching values above 90% in solutions of 40 and 80 mg/L of contaminant, and above 30% for 160mg/L. with contact time starting at 120 minutes for concentrations of 40,80 and 160 mg/L. While HDL-Ni0,2Al0,8 the contact time was from 240 minutes, obtaining removal above 50% for the respective concentrations. Evaluating the influence of temperature, it was observed that increasing the temperature from ~29oC to 50oC promoted an increase in the removal of the dye in the solution, with all adsorbents being indicative of an endothermic process. Finally, in the kinetic study, the model that best fit the experimental data was the pseudo-second order model, indicating that the process of adsorption of the tartrazine yellow dye in an aqueous is controlled by chemisorption.Item Remoção do corante Azo Direct Black 22 utilizando fungos Aspergillus(2021-12-06) Santos, Karolaine da Conceição Gama; Bezerra, Raquel Pedrosa; http://lattes.cnpq.br/1466206759539320; http://lattes.cnpq.br/8911087163041081During the activity of the textile industrial sector, characteristic effluents are generated due to their strong coloration and, in contrast to the benefits, concerns arise from the impacts caused by the presence of dyes in the effluents. As they are difficult to degrade and have high toxicity, dyes lead to the eutrophication process and a reduction in the photosynthetic rate in water bodies, in addition to presenting toxic bioaccumulative potential. Therefore, it is essential to treat wastewater prior to release into water bodies, with the bioremediation process that employs micro-organisms to degrade such compounds as an alternative. Thus, this study aimed to investigate the ability of fungi of the genus Aspergillus to remove the tetra-azo dye Direct Black 22 (DB22). A selection of fungi from DB22 dye discoloration (50 mg/ L) was performed using 1g of live biomass of A. japonicus (URM 5620), A. niger (URM 5741) and A. niger (URM 5838) with duration 2 hours of experimentation, under at room temperature and 120 RPM. The fungi that showed the best results were A. niger (URM 5741) and A. niger (URM 5838), which in the initial 10 minutes of the experiment removed the DB22 dye by 86% and 97%, respectively. Such fungi were used with values of 1 g and 3 g of live biomass to evaluate the influence of the amount of biomass, since 1 g of biomass presented at the end of the test better dye removal, reaching the maximum discoloration of 100% and 99% for A. niger (URM 5741) and A. niger (URM 5838), respectively. The decolorizing capacity between live and dead fungal biomass (1 g) was also investigated, and it was observed that the dead biomass had the best percentage of discoloration, 66% and 96% for A. niger (URM 5741) and A. niger (URM 5838), respectively, still in the first minute of rehearsal. In this way, showing the ability of Aspergillus to remove DB22. Therefore, having seen the efficiency of application of such a filamentous fungus, it is necessary to further investigate the fungal biological mechanism in the removal of the textile dye and evaluate different test conditions to later be applied in real effluent on an industrial scale in order to contribute to the reuse of water in the harsh region of the State.Item Descoloração do corante têxtil marinho Direct 2R utilizando o fungo Aspergillus tamarii kita UCP 1279(2021-12-03) Cruz, Nayara Vitória dos Santos; Bezerra, Raquel Pedrosa; Silva, Raphael Luiz Andrade; http://lattes.cnpq.br/4770766127962026; http://lattes.cnpq.br/1466206759539320; http://lattes.cnpq.br/9306095300572849Synthetic dyes are widely used in textile industries, being characterized as easy- to-use substances, with great variety and profitability. Despite their attractiveness, dyes are also considered complex compounds, being characterized by their toxicity, hazardousness and difficult degradation. Treating wastewater before release into water bodies is essential for the environment. The biological method can be used with algae, bacteria, and fungi, the latter organisms being considered as one of the best models for treating effluents. Therefore, the present study sought to investigate the use of the fungus Aspergillus tamarii kita UCP 1279, isolated from the Caatinga Biome, to discolor a solution containing a textile dye from a laundry located in the interior of the state of Pernambuco. The discoloration of the Marine Direct 2R dye was evaluated at a concentration of 50 mg/L, these experiments were carried out using the microorganism A. tamarii kita under living and dead conditions, in different amounts of biomass (2, 4, and 6 grams). In addition, biomass reuse was evaluated, so that, after the first decolorization test of 120 minutes, two further decolorization sequences with 120 minutes each were conducted for all conditions. The best condition obtained with 2 grams of biomass was found in the dead condition, which, in just 15 minutes, discolored 97% of the color while, with 4 and 6 grams of biomass, the best performance was verified in the living condition, in which, at 15 minutes it reached 100% removals for both 4 and 6 grams of biomass. In the tests with the reuse of biomass, both conditions (live/dead) demonstrated efficiency in discoloring the dye in different quantities of biomass, at the end of the tests, thus showing the potential of the microorganism A. tamarii kita in carrying out the dye decolorization textile. Therefore, due to the effectiveness of the microorganism, the development of future research investigating the optimization of the process deserves to be studied, to provide an understanding of the best conditions for using A. tamarii kita, so that its use can be made viable on an industrial scale, as a new biological method to treat effluents containing textile dyes.Item Síntese eletroquímica da estrutura metal-orgânica de [Cu3(BTC)2 .(H2O)3]n e sua aplicação em biossensores e meio ambiente(2018-08-27) Silva, Renata Pereira da; Freitas, Kátia Cristina Silva de; http://lattes.cnpq.br/9622769576689246; http://lattes.cnpq.br/9318114882701456The MOFs (Metal-Organic Frameworks) are a new class of materials known as porous coordination networks, form an extensive class of crystalline materials, featuring a central atom (metal ion) or sintered (metallic cluster) coordinated the organic molecules (ligands), in which this unit metal-ligand repeats itself forming a polymer metal complex network in one, two or three dimensions. One of the most important properties of this metal-organic framework is the high porosity and large surface area, properties that are exploited for the development of a textile dye adsorbent material in effluent and as crippling to the Lectin of Cratylia Mollis, a specific enzyme for glucose. The MOF [Cu3 (BTC) 2 ( H2O) 3] n was obtained by electrochemical synthesis and by current limiter using an acid solution 1, 3, 5-benzenotricarboxilico, sodium nitrate and dimethylformamide in water Mllipore a ratio of 1:1. The precipitate was filtered, washed and dried in an oven at 120° C, and then was characterized by absorption spectroscopy in the infrared region using a Fourier transform with spectrophotometer (FTIR) and by cyclic voltammetry. After this MOF mix with a solution that simulated a textile effluent, it was found that it can be used in your treatment as it was retrieved from a colorless effluent and the stabilization of the dye in your structure. The developed biosensors have been drawn up with the MOF with the lectin, and graphite paste in Platinum and gold electrodes. The cyclic voltammetry of these systems in solution of glucose and fructose. Indicating that the lectin interacts with low-concentration glucose solutions with the gold record (10:15, 5 mM due to the increase of the cathode and Anodic peaks), while that with the Platinum card she interacts with high concentrations of glucose (20, 40 and 60 mM due to the increase of cathode and Anodic peaks). Interaction not observed of the lectin with fructose, as expected. This system can be used for the identification of glucans in effluents, and identification of glucose in real samples, not requiring a large amount of sample for identification, making the low-cost and efficient method.