Licenciatura em Química (Sede)
URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/26
Siglas das Coleções:
APP - Artigo Publicado em Periódico
TAE - Trabalho Apresentado em Evento
TCC - Trabalho de Conclusão de Curso
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8 resultados
Resultados da Pesquisa
Item Uma proposta de experimento investigativo com materiais de baixo custo para ensino e aprendizagem de eletroquímica(2023-09-05) Vasconcelos, Rodrigo da Silva; Freitas, Kátia Cristina Silva de; http://lattes.cnpq.br/5859266863241551This work proposes a teaching-learning sequence for classes in high school addressing contents, concepts and skills related to electrochemistry aiming to complement traditional teaching classes with the implementation of experimental procedures with low-cost materials. It should be noted that because it is a broad, complex and important content, greater attention should be paid to the way it is taught. During the present work, it was sought to evaluate whether a didactic sequence divided into five stages with the use of demonstrative and investigative experimentation can improve the teaching-learning process of contents and skills, through the proposition of experimental procedures in constructions of electrochemical cells and the qualitative analysis of the contents and concepts emerged at the end of the didactic sequence. It is concluded that the sequence proposal can contribute positively to the development of knowledge because, at the end of the research, some substitutions and complementations of initial conceptions related to electrochemistry are perceived.Item A importância da experimentação no enfoque demonstrativo no processo de ensino-aprendizagem do conteúdo de eletroquímica de forma contextualizada(2023-04-17) Silva, Suelani Marques da; Silva, Suely Alves da; http://lattes.cnpq.br/3497194749381919The lack of contextualization from the historical, cultural, economic and technological point of view, as well as the lack of experimentation in the classroom, often due to lack of structure and laboratory in schools, have been some of the many problems faced in teaching chemistry. Thus, the use of contexts that interact with the student's reality can significantly contribute to the learning of scientific concepts. Therefore, the objective of this research was to analyze the use of experiments with a demonstrative approach in the teaching and learning process of electrochemistry in a contextualized way. The development of this research took place in the third year class of a reference school located in Paulista/Pernambuco, with the participation of 35 students. The didactic sequence used was divided into 5 moments, distributed in 5 classes and three modalities used as data collection instruments were applied. When the observers' responses occurred, there was a high rate of correct answers in questions related to technological, social and environmental contexts, as well as in relation to content and electrochemistry, however, most arguments were not present about the scientific content. The obtained results proved the importance of working the electrochemistry content from a contextualized practice. The results obtained highlight the importance of working with the electrochemical content from the demonstrative approach in a contextualized way, showing a relevant alternative to help the understanding of the content by the student in contexts that influence the reality of the students, such as technological, social and cultural conceptions that brings meaning to the learning of scientific concepts.Item Caracterização eletroquímica das interaçôes da lectina de sementes de Cratylia mollis (Cramoll) com glicose e eritrócitos de coelho em biossensor de MOF de [Cu3(BTC)2.(H2O)3]n(2022-05-31) Carvalho, Maryana Hermínio de; Coelho, Luana Cassandra Breitenbach Barroso; Freitas, Kátia Cristina Silva de; http://lattes.cnpq.br/5859266863241551; http://lattes.cnpq.br/2944428818449047; http://lattes.cnpq.br/0134945103585503Biosensors are small devices known for their selectivity, high specificity and sensitivity with the respective analyte even at low concentrations. Thus, we aimed to evaluate the charge transfer and electrochemical potential of the plant popularly known as camaratu bean, a forage native to the Caatinga biome, rich in shrub legumes, from which Cramoll lectin is extracted from Cratylia mollis Mart. electrochemical biosensor using the crystalline polymer MOF- [Cu3(BTC)2.(H2O)3]n.. to immobilize and characterize the physical and chemical properties of C. mollis (Cramoll) seed lectin and its interaction with free carbohydrates (glu-cose) and carbohydrates on the surface of rabbit erythrocytes. Lectin immobilization in MOF was effective for the construction of the electrochemical system, showing itself to be sensi-tive to conformational changes, being able to detect changes in the electrochemical poten-tials of Cramoll promoted in a buffered medium (200 mM potassium phosphate buffer, pH 7.0) with different glucose concentrations, highlighting the concentrations of 10 mM (96 - 121 mV), 15 mM (110 - 126 mV) and 20 mM (107 - 142 mV) in the time of 5 to 30 min. In the cyclic voltammetry, the interaction in the potential range from -0.2 to 0.0 V stood out; with the current reaching 0.0003 A and at peak 2 in the potential range of 0.4 to 0.5 V; with the current reaching 0.0007 A. The interaction of the carbohydrate present on the surface of the rabbit erythrocyte was also monitored by the potentiometric method, detecting changes in the Cramoll-glucose potentials, even in the presence of rabbit erythrocytes. Through SEM, it was possible to observe Cramoll immobilized on the MOF surface, proving the specificity of the ligand (glucose-lectin) through the morphological changes of this protein in this process. This electrochemical model, Cramoll/MOF biosensor, is effective for evalu-ating free lectin/carbohydrate or in the erythrocyte membrane.Item Proposta de uma sequência didática para o ensino de eletroquímica: biossensor como ferramenta de intervenção didática no processo de ensino-aprendizagem(2020-11-05) Silva, Suzi Batista da; Souza, Sandra Rodrigues de; http://lattes.cnpq.br/4678692939311710; http://lattes.cnpq.br/2869555050306545To mitigate the main difficulties encountered in the teaching and learning process, methodologies are proposed with a focus on didactics more focused on research, investigation and experimentation actions, which may provide more active strategies from the didactic and pedagogical point of view, facilitating the participation of the student. student in this process. The contents in electrochemistry have been frequently pointed out by high school teachers and students as one of the subjects that represents great difficulties in the teaching - learning process. In view of the difficulty exposed, this research aimed to develop a didactic sequence to alleviate the learning difficulties in teaching electrochemistry using the biosensors as input. The teaching methodologies proposed for the study of the concepts about galvanic cells (batteries) involve practical experimental activities through investigation and problem solving (problem situation). For this purpose, it was proposed to use the functioning of electrochemical biosensors as a didactic tool for conceptual knowledge applied to electrochemistry. In this way, the use of specific methodologies for teaching chemistry promotes significant results, allowing the student to reflect and resolve the contradictions of problematic situations as a resource in the construction of concepts, making the student's learning process effective.Item Sistemas eletroquímicos para tratar amostras de água contendo corante têxtil como ferramenta didática para divulgação da poluição hídrica(2021-07-07) Neves, Eloisa Ferreira; Freitas, Kátia Cristina Silva de; http://lattes.cnpq.br/5859266863241551; http://lattes.cnpq.br/9764373408949634Didactic workshops for scientific and technological dissemination, in addition to contributing to motivational aspects for the development of learning, are an interactive strategy that can provide the development of science learning. This research aims to use electrochemical systems to characterize the physicochemical properties of the coagulant lectin from Moringa oleifera seeds (cMoL) in the treatment of water samples containing indigo-type textile dyes as teaching tools for scientific dissemination about water pollution in effluents from the textile industry. The methodological development of this research comprises the development of aluminum piles using aluminum cans and PET bottles for the treatment of indigo-type dye solution; the determination of electrochemical potentials and cyclic voltammograms generated by the agglutination of cMoL immobilized on the MOF with an aqueous solution of indigo carmine dye; the development of potentiometric biosensors for the determination of indigo dye residues in aqueous media. Considerable differences were observed in the electrochemical potentials in relation to the platinum electrode (Pt), MOF coated platinum working electrode (Pt/MOF), MOF coated platinum electrode and immobilized cMoL (Pt/MOF/cMoL) and when interacting Pt /MOF/cMoL with different concentrations of galactose. Cyclic voltammetry showed results with significant differences between the untreated dye sample and the dye samples after treatment. The development of didactic workshops in school spaces to validate the electrochemical system as a didactic tool applied to learning and dissemination about water pollution caused by the disposal of indigo dyes in textile industry effluents is relevant for the construction of concepts related to electrochemistry.Item Análise do uso de paródias sobre eletroquímica, de autoria de estudantes, como estratégia didática no ensino de Química(2021-07-15) Silva, Diego Florêncio da; Firme, Ruth do Nascimento; http://lattes.cnpq.br/7234636790850019; http://lattes.cnpq.br/0025065221774993In this research, we aim to analyze the objective of analyzing the use of parodies, authored by students, as a didactic strategy in the teaching of chemistry. Methodologically, this research is qualitative, was developed with 42 students from the 2nd grade of high school, and followed four steps: elaboration of the questionnaire; didactic intervention planning; development of didactic intervention; data analysis. As for the students’ prior conceptions about aspects related to the Electrochemistry content, we noticed that most students expressed coherent prior conceptions from a scientific point of view about some aspects related to the Electrochemistry content. As for intertextuality, as one of the elements of the Parody genre, we can say that in all parodies it was identified, however in different degrees, that is, in some parodies produced by the groups, intertextuality was more noticeable than in others. Finally, in the parodies produced by the students, from the perspective of the concepts of the Electrochemical content used by them, we can say that in them, the students used different concepts as a basis, among which we highlight: oxidation number, oxidation, reduction, oxidation-reduction, anode, cathode. The results of this research may reflect contributions to research in the area of teaching Chemistry that has as its object of study the use of parodies as a didactic strategy, highlighting the role of students at the time when they chose the songs to be parodied and produced their own parodies.Item Uma estratégia de ensino e aprendizagem com o enfoque CTSA numa perspectiva contextualizada através do conteúdo de eletroquímica(2019-07-02) Silva, Bianca Maria da; Freitas, Kátia Cristina Silva de; Souza, Sandra Rodrigues de; http://lattes.cnpq.br/4678692939311710; http://lattes.cnpq.br/5859266863241551; http://lattes.cnpq.br/4826281281005863The Didactic Sequence (DS) is a classroom organization technique widely used in the Natural Sciences teaching, providing sense to the teacher’s pedagogical practices themes. Through its utilization it is possible to establish, for example, an investigative teaching, with the problematization, organization of the subjects and application of knowledge. In the construction of these activities it is necessary the attention to the taught content, the student’s cognitive characteristics, didactic dimension related to the teaching institution, learning reasons, significance of the knowledge to be taught and planning the activity execution. In this sense, this research aimed to apply and evaluate a DS teaching focused on Science-Technology-Society-Environment (STSE) with a problematizing perspective and contextualized through the electrochemical subject. The results showed that when planning teaching activities in a STSE perspective, it is observed that the students presented a facility for understanding the content.Item Atividade experimental em eletrólise para o ensino de química: abordagem para uma educação ambiental na escola(2018-08-17) Silva, Thiago Ramos da; Freitas, Kátia Cristina Silva de; http://lattes.cnpq.br/5859266863241551; http://lattes.cnpq.br/3205312853023513This work aims to analyze if the use of experimental activity in electrolysis, contextualized by environmental issues, will bring to the students of high school a more comprehensive understanding on the subject in the classes of chemistry. For this, the following methodological procedure was adopted: 1) research with teachers from the State of Pernambuco about how they analyze the electrolysis experiment, as a didactic resource to be developed in the classroom; and 2) construction of didactic planning and application of a Didactic Sequence (SD) on the electrolysis theme. The present study was based on a descriptive and exploratory qualitative analysis, where the data obtained served as a personal parameter to answer the questioning of the objective mentioned above. All the data made with the teachers in this research, after being processed, were constructing the idea for a relevance of the topic related to environmental awareness, since this transversal theme should be present in the educational process of students at various school levels, as recommended by the National Policy on Brazilian Environmental Education and the National Curricular Parameters. In order to construct students' knowledge in a well-planned way, the application of SD was divided into two moments: theoretical lecture on some topics of electrochemistry, whose emphasis was mainly on learning the electrolysis subject; and next, an experimental class in the room about electrocoagulation, using easily accessible materials. The verification of the phenomenon occurred in the experiment had as fundamental characteristic the use of electrolysis for water treatment purposes, using iron electrode in a hypothetical sample of a solution containing dyeing paint for clothes.