Nanofotocatalisadores de ZnO dopados com cério para tratamento de efluentes da indústria têxtil pernambucana
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Biblioteca Digital de Teses e Dissertações da UFRPE |
Texto Completo: | http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/8924 |
Resumo: | The state of Pernambuco has one of the largest textile centers in Brazil, and as the entire textile industry uses a large volume of water in the dyeing and finishing stages, the laundries and the textile sector have greatest potential for contamination of effluents due to the amount of organic matter generated, creating various environmental and social problems. In recent decades, photocatalytic processes have stood out as an alternative for the treatment of effluents with high organic load, using semiconductors as photocatalysts, in particular zinc oxide (ZnO). In this sense, the objective of this dissertation was to synthesize Zn(1-x)CexO nanoparticles with x= 0, 0.005, 0.01, 0.02, 0.03, 0.04 and 0.05, by the microwave-assisted hydrothermal method and evaluate their efficiency as photocatalysts. Synthesis was performed at 120°C for a time of 32 minutes in alkaline NaOH 3M solution. The samples were obtained in powder form and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and UV-Visible spectroscopy (UV-VIS) measurements. SEM images showed that the particles are constituted by nanoplates with average thickness between 41 and 87 nm, and width between 329 and 741 nm, forming a three-dimensional cluster with a perimeter between 11 and 46 μm. XRD technique showed that all samples have a hexagonal wurtzite type crystalline structure of ZnO. For samples with Ce content greater than 1%, peaks referring to the cubic phase of CeO2 were identified. UV-VIS spectra showed a reduction in the optical band gap of the samples with the increase in cerium content. In the photocatalytic tests all synthesized samples were able to fully degrade the methylene blue dye after 30 min. An increase in photocatalytic efficiency was verified with increasing Ce content up to 1%, due to the creation of intermediate states in the band gap optimizing the removal power of the photocatalyst. |
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ARAÚJO, Vinícius Dantas deESCANHOELA JUNIOR, Carlos AugustoHOLANDA, Romildo Morant dehttp://lattes.cnpq.br/3360160342806804SANTIAGO, Leonardo Felix2023-05-09T11:23:15Z2021-07-23SANTIAGO, Leonardo Felix. Nanofotocatalisadores de ZnO dopados com cério para tratamento de efluentes da indústria têxtil pernambucana. 2021. 74 f. Dissertação (Programa de Pós-Graduação em Engenharia Física) - Universidade Federal Rural de Pernambuco, Cabo de Santo Agostinho.http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/8924The state of Pernambuco has one of the largest textile centers in Brazil, and as the entire textile industry uses a large volume of water in the dyeing and finishing stages, the laundries and the textile sector have greatest potential for contamination of effluents due to the amount of organic matter generated, creating various environmental and social problems. In recent decades, photocatalytic processes have stood out as an alternative for the treatment of effluents with high organic load, using semiconductors as photocatalysts, in particular zinc oxide (ZnO). In this sense, the objective of this dissertation was to synthesize Zn(1-x)CexO nanoparticles with x= 0, 0.005, 0.01, 0.02, 0.03, 0.04 and 0.05, by the microwave-assisted hydrothermal method and evaluate their efficiency as photocatalysts. Synthesis was performed at 120°C for a time of 32 minutes in alkaline NaOH 3M solution. The samples were obtained in powder form and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and UV-Visible spectroscopy (UV-VIS) measurements. SEM images showed that the particles are constituted by nanoplates with average thickness between 41 and 87 nm, and width between 329 and 741 nm, forming a three-dimensional cluster with a perimeter between 11 and 46 μm. XRD technique showed that all samples have a hexagonal wurtzite type crystalline structure of ZnO. For samples with Ce content greater than 1%, peaks referring to the cubic phase of CeO2 were identified. UV-VIS spectra showed a reduction in the optical band gap of the samples with the increase in cerium content. In the photocatalytic tests all synthesized samples were able to fully degrade the methylene blue dye after 30 min. An increase in photocatalytic efficiency was verified with increasing Ce content up to 1%, due to the creation of intermediate states in the band gap optimizing the removal power of the photocatalyst.O estado de Pernambuco detém um dos maiores polos têxteis do Brasil, e como toda indústria têxtil utilizam grande volume de água nas etapas de tingimento e acabamentos, as lavanderias o setor têxtil tem grande potencial de contaminação dos efluentes devido a quantidade de matéria orgânica gerada, criando diversos problemas ambientais e sociais. Nas últimas décadas os processos fotocatalíticos têm se destacado como alternativa para o tratamento dos efluentes com elevada carga orgânica, utilizando semicondutores como fotocatalisadores, em particular, o óxido de zinco (ZnO). Nesse sentido, o objetivo desta dissertação foi sintetizar nanopartículas de Zn(1-x)CexO com x= 0, 0,005, 0,01, 0,02, 0,03, 0,04 e 0,05, pelo método hidrotérmico assistido por micro-ondas e avaliar sua eficiência como fotocatalisadores. A síntese foi realizada na temperatura de 120°C por um tempo de 32 minutos em solução alcalina de NaOH 3M. As amostras foram obtidas na forma de pó e caracterizadas por meio de medidas de microscopia eletrônica de varreduta (MEV), difração de raios X (DRX) e espectroscopia na região do UV-Visível (UV-VIS). Imagens de MEV mostraram que as partículas são constituídas por nanoplacas com espessura média entre 41 e 87 nm, e largura entre 329 e 741 nm, formando um aglomerado tridimensional com perímetro entre 11 e 46 μm. A técnica de DRX comprovou que todas as amostras apresentam estrutura cristalina hexagonal wurtzita do ZnO. Para amostras com concetração de Ce superior a 1% foram identificados picos referentes à fase cúbica do CeO2. Espectros UV-VIS mostraram uma redução no band gap óptico das amostras com o aumento no teor de cério. Nos testes fotocatalíticos todas as amostras sintetizadas conseguiram degradar totalmente o corante azul de metileno após 30 min. Foi verificado um aumento na eficiência fotocatalítica como aumento do teor de Ce até 1%, devido a criação de estados intermediários no bandgap otimizando o poder de degração do fotocatalizador.Submitted by Mario BC (mario@bc.ufrpe.br) on 2023-05-09T11:23:14Z No. of bitstreams: 1 Leonardo Felix Santiago.pdf: 1869059 bytes, checksum: 58d3af2ac3ae3d29e52bdcc5ea246b0d (MD5)Made available in DSpace on 2023-05-09T11:23:15Z (GMT). No. of bitstreams: 1 Leonardo Felix Santiago.pdf: 1869059 bytes, checksum: 58d3af2ac3ae3d29e52bdcc5ea246b0d (MD5) Previous issue date: 2021-07-23application/pdfporUniversidade Federal Rural de PernambucoPrograma de Pós-Graduação em Engenharia FísicaUFRPEBrasilUnidade Acadêmica do Cabo de Santo AgostinhoÓxido de zincoFotocatáliseCérioTratamento de efluentesIndústria têxtilENGENHARIASNanofotocatalisadores de ZnO dopados com cério para tratamento de efluentes da indústria têxtil pernambucanainfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesis-761962378915184685860060060014368776284275036114518971056484826825info:eu-repo/semantics/openAccessreponame:Biblioteca Digital de Teses e Dissertações da UFRPEinstname:Universidade Federal Rural de Pernambuco (UFRPE)instacron:UFRPEORIGINALLeonardo Felix Santiago.pdfLeonardo Felix Santiago.pdfapplication/pdf1869059http://www.tede2.ufrpe.br:8080/tede2/bitstream/tede2/8924/2/Leonardo+Felix+Santiago.pdf58d3af2ac3ae3d29e52bdcc5ea246b0dMD52LICENSElicense.txtlicense.txttext/plain; charset=utf-82165http://www.tede2.ufrpe.br:8080/tede2/bitstream/tede2/8924/1/license.txtbd3efa91386c1718a7f26a329fdcb468MD51tede2/89242023-07-10 16:57:18.835oai:tede2: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Biblioteca Digital de Teses e Dissertaçõeshttp://www.tede2.ufrpe.br:8080/tede/PUBhttp://www.tede2.ufrpe.br:8080/oai/requestbdtd@ufrpe.br ||bdtd@ufrpe.bropendoar:2024-05-28T12:37:36.245197Biblioteca Digital de Teses e Dissertações da UFRPE - Universidade Federal Rural de Pernambuco (UFRPE)false |
dc.title.por.fl_str_mv |
Nanofotocatalisadores de ZnO dopados com cério para tratamento de efluentes da indústria têxtil pernambucana |
title |
Nanofotocatalisadores de ZnO dopados com cério para tratamento de efluentes da indústria têxtil pernambucana |
spellingShingle |
Nanofotocatalisadores de ZnO dopados com cério para tratamento de efluentes da indústria têxtil pernambucana SANTIAGO, Leonardo Felix Óxido de zinco Fotocatálise Cério Tratamento de efluentes Indústria têxtil ENGENHARIAS |
title_short |
Nanofotocatalisadores de ZnO dopados com cério para tratamento de efluentes da indústria têxtil pernambucana |
title_full |
Nanofotocatalisadores de ZnO dopados com cério para tratamento de efluentes da indústria têxtil pernambucana |
title_fullStr |
Nanofotocatalisadores de ZnO dopados com cério para tratamento de efluentes da indústria têxtil pernambucana |
title_full_unstemmed |
Nanofotocatalisadores de ZnO dopados com cério para tratamento de efluentes da indústria têxtil pernambucana |
title_sort |
Nanofotocatalisadores de ZnO dopados com cério para tratamento de efluentes da indústria têxtil pernambucana |
author |
SANTIAGO, Leonardo Felix |
author_facet |
SANTIAGO, Leonardo Felix |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
ARAÚJO, Vinícius Dantas de |
dc.contributor.referee1.fl_str_mv |
ESCANHOELA JUNIOR, Carlos Augusto |
dc.contributor.referee2.fl_str_mv |
HOLANDA, Romildo Morant de |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/3360160342806804 |
dc.contributor.author.fl_str_mv |
SANTIAGO, Leonardo Felix |
contributor_str_mv |
ARAÚJO, Vinícius Dantas de ESCANHOELA JUNIOR, Carlos Augusto HOLANDA, Romildo Morant de |
dc.subject.por.fl_str_mv |
Óxido de zinco Fotocatálise Cério Tratamento de efluentes Indústria têxtil |
topic |
Óxido de zinco Fotocatálise Cério Tratamento de efluentes Indústria têxtil ENGENHARIAS |
dc.subject.cnpq.fl_str_mv |
ENGENHARIAS |
description |
The state of Pernambuco has one of the largest textile centers in Brazil, and as the entire textile industry uses a large volume of water in the dyeing and finishing stages, the laundries and the textile sector have greatest potential for contamination of effluents due to the amount of organic matter generated, creating various environmental and social problems. In recent decades, photocatalytic processes have stood out as an alternative for the treatment of effluents with high organic load, using semiconductors as photocatalysts, in particular zinc oxide (ZnO). In this sense, the objective of this dissertation was to synthesize Zn(1-x)CexO nanoparticles with x= 0, 0.005, 0.01, 0.02, 0.03, 0.04 and 0.05, by the microwave-assisted hydrothermal method and evaluate their efficiency as photocatalysts. Synthesis was performed at 120°C for a time of 32 minutes in alkaline NaOH 3M solution. The samples were obtained in powder form and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and UV-Visible spectroscopy (UV-VIS) measurements. SEM images showed that the particles are constituted by nanoplates with average thickness between 41 and 87 nm, and width between 329 and 741 nm, forming a three-dimensional cluster with a perimeter between 11 and 46 μm. XRD technique showed that all samples have a hexagonal wurtzite type crystalline structure of ZnO. For samples with Ce content greater than 1%, peaks referring to the cubic phase of CeO2 were identified. UV-VIS spectra showed a reduction in the optical band gap of the samples with the increase in cerium content. In the photocatalytic tests all synthesized samples were able to fully degrade the methylene blue dye after 30 min. An increase in photocatalytic efficiency was verified with increasing Ce content up to 1%, due to the creation of intermediate states in the band gap optimizing the removal power of the photocatalyst. |
publishDate |
2021 |
dc.date.issued.fl_str_mv |
2021-07-23 |
dc.date.accessioned.fl_str_mv |
2023-05-09T11:23:15Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
SANTIAGO, Leonardo Felix. Nanofotocatalisadores de ZnO dopados com cério para tratamento de efluentes da indústria têxtil pernambucana. 2021. 74 f. Dissertação (Programa de Pós-Graduação em Engenharia Física) - Universidade Federal Rural de Pernambuco, Cabo de Santo Agostinho. |
dc.identifier.uri.fl_str_mv |
http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/8924 |
identifier_str_mv |
SANTIAGO, Leonardo Felix. Nanofotocatalisadores de ZnO dopados com cério para tratamento de efluentes da indústria têxtil pernambucana. 2021. 74 f. Dissertação (Programa de Pós-Graduação em Engenharia Física) - Universidade Federal Rural de Pernambuco, Cabo de Santo Agostinho. |
url |
http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/8924 |
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por |
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por |
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openAccess |
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Universidade Federal Rural de Pernambuco |
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Universidade Federal Rural de Pernambuco |
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