FOTOCATÁLISE HETEROGÊNEA APLICADA NO TRATAMENTO DO CORANTE RODAMINA B – USO DE CATALISADOR DE TIO2 SOB RADIAÇÃO UV

Resumo: Os efluentes dos processos de tingimento na indústria têxtil apresentam uma complexa composição, incluindo principalmente corantes de diferente natureza química, portanto o tratamento destes tem como finalidades necessárias a remoção da cor e a degradação dos compostos orgânicos presentes. Dessa forma, este projeto teve por objetivo apresentar uma alternativa frente ao descarte de efluentes têxteis, usando como modelo o corante rodamina B, um corante resistente à fotodegradação natural. O projeto consistiu na construção de um reator fotocatalítico usando uma placa de vidro jateada e impregnada com catalisador de TiO2. Essa placa foi fixada com inclinação estabelecida. Além disso, foram utilizadas duas lâmpadas germicidas de radiação UV e potência de 15 W. Foram analisados a influência da concentração inicial, tempo de residência no reator e pH da solução para remoção de cor do corante. A descoloração da solução foi acompanhada pela medida da absorbância das amostras coletadas durante o ensaio. A eficiência do reator foi avaliada em relação à descoloração da solução. Os melhores resultados foram obtidos para uma solução de 7,80 mg L-1 a pH 5.0 foi tratada por 430 min alcançando um 97,84% de descoloração. AbstractThe effluents from the dyeing processes in the textile industry have a complex composition, including mainly dyes of different chemical nature, so the treatment of these has the necessary purposes of removing the color and the degradation of the organic compounds present. In this way, this project aimed to present an alternative to the disposal of textile effluents, using as a model the rhodamine B dye, a dye resistant to natural photodegradation. The project consisted in the construction of a photocatalytic reactor using a blasted glass plate and impregnated with TiO2 catalyst, It was fixed in a pre-established inclination, besides that, two germicide UV lamps at 15 W were employed. The influence of the initial concentration, residence time in the reactor and pH of the solution for color removal of the dye were analyzed. Solution discoloration was followed by absorbance measurement of the sample solution collected along the assay. The reactor efficiency was evaluated in relation to the discoloration of the sample solution. Best results were achieved when a solution of 7.80 mg L-1 at pH 5.0 was treated for 430 min reaching 97.84% of discoloration

The complete genome sequence of Chromobacterium violaceum reveals remarkable and exploitable bacterial adaptability

Chromobacterium violaceum is one of millions of species of free-living microorganisms that populate the soil and water in the extant areas of tropical biodiversity around the world. Its complete genome sequence reveals (i) extensive alternative pathways for energy generation, (ii) ≈500 ORFs for transport-related proteins, (iii) complex and extensive systems for stress adaptation and motility, and (iv) wide-spread utilization of quorum sensing for control of inducible systems, all of which underpin the versatility and adaptability of the organism. The genome also contains extensive but incomplete arrays of ORFs coding for proteins associated with mammalian pathogenicity, possibly involved in the occasional but often fatal cases of human C. violaceum infection. There is, in addition, a series of previously unknown but important enzymes and secondary metabolites including paraquat-inducible proteins, drug and heavy-metal-resistance proteins, multiple chitinases, and proteins for the detoxification of xenobiotics that may have biotechnological applications

Discharge products formation and performance results in lithium-oxygen open and closed systems

Orientador: Gustavo DoubekDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia QuímicaResumo: Preocupações com o aumento da poluição do meio ambiente e alterações climáticas, principalmente devido à emissão de gases do efeito estufa pelo uso de combustíveis fósseis, impulsiona o desenvolvimento de sistemas de armazenamento de energia elétrica. Neste contexto, as baterias de Li-O2 desempenham um papel importante devido à sua alta densidade de energia teórica e prática. Assim, esta pesquisa analisou um sistema aberto (com fluxo de oxigênio) e um sistema fechado (sem fluxo de oxigênio) em baterias de Li-O2 apróticas, utilizando nanotubos de carbono de parede múltipla radialmente orientados funcionalizados com plasma oxigênio, como eletrodo de ar. Primeiramente, os eletrodos foram sintetizados e caracterizados. Pelas análises de MEV verificou-se que apenas a primeira e oitava bateladas de crescimentos possuíam a morfologia de ROMWCNT. Com o auxílio das técnicas de Raman e XPS confirmou-se a eficiência do tratamento com plasma oxigênio e o aumento no número de defeitos na estrutura dos nanotubos de carbono. Testes de descarga foram conduzidos com uma corrente de 23 µA/cm² e os produtos de descarga foram caracterizados por DRX e Raman. Em ambos os sistemas, fechado e aberto, Li2O2 e LiOH foram identificados, e o LiOOH.H2O, o Li2O e o LiO2 foram identificados apenas para o sistema fechado. Através das análises por MEV observou-se diferentes morfologias para cada sistema. O desempenho eletroquímico das baterias foi avaliado em diferentes condições de operação. Para o sistema aberto, em uma pressão de oxigênio de 1,5 bar, quando a vazão de oxigênio aumentou, 0,1, 0,3, 0,5 L/min, a capacidade diminuiu, 2460, 2107, 1459 mAh/g, respectivamente, e para o sistema fechado, o aumento da pressão de oxigênio, 1,0, 1,5, 2,0 bar, aumentou a capacidade, 2617, 4917, 5851 mAh/g, respectivamente. Além disso, a decomposição dos produtos após a carga foi analisada, onde o LiOH, único produto detectado por DRX, foi decomposto somente no teste onde a carga ocorreu por um maior período de tempo, cerca de 50 horasAbstract: The concern about the environment pollution and climate change, mainly due the emission of greenhouse gases by the use of fossil fuels lead to the development of electric energy storage systems. In this context, Li-O2 batteries play an important role due their high theoretical and practical energy density. Thus, this research analyzed an open system (with oxygen flow) and a closed system (without oxygen flow) in aprotic Li-O2 batteries, using radially ordered multiwalled carbon nanotube functionalized with oxygen plasma as the air electrode. First, the electrodes were synthesized and characterized, and using SEM analysis it was observed that only the first and eighth growth had the morphology of ROMWCNT. The Raman and XPS techniques confirmed the efficiency of the treatment with oxygen plasma and the increase in the defects number in the structure of the carbon nanotubes. Discharge tests were conducted with a current of 23 µA/cm² and the discharge products were characterized by DRX and Raman. In both systems, closed and open, Li2O2 and LiOH were identified, and LiOOH.H2O, Li2O and LiO2 were identified only in the closed system. Through SEM analysis, different morphologies were observed for each system. The electrochemical performance of the batteries was evaluated in different operating conditions. For the open system, at an oxygen pressure of 1.5 bar, when the oxygen flow rate increased, 0.1, 0.3, 0.5 L/min, the capacity decreased, 2460, 2107, 1459 mAh/g respectively, and for the closed system, the increase of the oxygen pressure, 1.0, 1.5, 2.0 bar, increased the capacity, 2617, 4917, 5851 mAh/g respectively. In addition, the decomposition of the products after charge was analyzed, in which the LiOH, the only product detected by XRD, was decomposed in the test in which the charge occurred for a longer period of time, about 50 hoursMestradoEngenharia QuímicaMestra em Engenharia Química132620/2018-9CNP

Resumos concluídos - Ciências Contábeis

Resumos concluídos - Ciências Contábei

NEOTROPICAL ALIEN MAMMALS: a data set of occurrence and abundance of alien mammals in the Neotropics

Biological invasion is one of the main threats to native biodiversity. For a species to become invasive, it must be voluntarily or involuntarily introduced by humans into a nonnative habitat. Mammals were among first taxa to be introduced worldwide for game, meat, and labor, yet the number of species introduced in the Neotropics remains unknown. In this data set, we make available occurrence and abundance data on mammal species that (1) transposed a geographical barrier and (2) were voluntarily or involuntarily introduced by humans into the Neotropics. Our data set is composed of 73,738 historical and current georeferenced records on alien mammal species of which around 96% correspond to occurrence data on 77 species belonging to eight orders and 26 families. Data cover 26 continental countries in the Neotropics, ranging from Mexico and its frontier regions (southern Florida and coastal-central Florida in the southeast United States) to Argentina, Paraguay, Chile, and Uruguay, and the 13 countries of Caribbean islands. Our data set also includes neotropical species (e.g., Callithrix sp., Myocastor coypus, Nasua nasua) considered alien in particular areas of Neotropics. The most numerous species in terms of records are from Bos sp. (n = 37,782), Sus scrofa (n = 6,730), and Canis familiaris (n = 10,084); 17 species were represented by only one record (e.g., Syncerus caffer, Cervus timorensis, Cervus unicolor, Canis latrans). Primates have the highest number of species in the data set (n = 20 species), partly because of uncertainties regarding taxonomic identification of the genera Callithrix, which includes the species Callithrix aurita, Callithrix flaviceps, Callithrix geoffroyi, Callithrix jacchus, Callithrix kuhlii, Callithrix penicillata, and their hybrids. This unique data set will be a valuable source of information on invasion risk assessments, biodiversity redistribution and conservation-related research. There are no copyright restrictions. Please cite this data paper when using the data in publications. We also request that researchers and teachers inform us on how they are using the data