Evaluation of ecotoxicological properties of industrial wastewater after photocatalytic treatment
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Tipo de documento: | Dissertação |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10362/24548 |
Resumo: | Heterogeneous photocatalysis is one of the most promising technologies for an advanced degradation of emerging pollutants in water bodies, due to the widespread availability of low-cost and efficient photocatalysts. The challenge, however, is to boost the exploitation of solar light through the use of photocatalysts with improved activity under sun irradiation. Most studies on this topic focus on the enhanced photodegradation yields achieved by the incorporation of the carbon additives. However the impact of the carbonaceous additive on the toxicity of the final effluent is scarcely addressed and little is known on the nature of the intermediates formed when the photooxidation pathway is modified. In this context, the aim of this work was to evaluate the impact of the incorporation of nanoporous carbons (either as photocatalysts or additives to semiconductors) in terms of an ecotoxicity risk assessment using phenol as a model organic pollutant. In this work it was used as catalysts TiO2, CQ and composites of TiO2 with CQ. It was measured the ecotoxicity of samples after 1, 3 and 6h of photodegradation for synthetic samples of phenol and wastewater from industrial origin. The results are interpreted in terms of the ecotoxicity of the solutions obtained after the photocatalytic assays by using the bioluminescence inhibition of the bacterium Vibrio fischeri, while exploring the role of the carbon component features (i.e. structure, texture) on the performance of the semiconductor/carbon photocatalysts, TiO2 using semiconductors. For both synthetic and real wastewater samples the lower ecotoxicity values were achieved after 6 hours of irradiation with the CQ as catalyst. The results with real samples have also shown that photodegradation assays performed with hybrid semiconductor/nanoporous carbon catalysts can be more effective than the semiconductors alone or photolysis. |
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Evaluation of ecotoxicological properties of industrial wastewater after photocatalytic treatmentEcotoxicityPhotocatalysisCarbonsPhenolTiO2Vibrio fischeriDomínio/Área Científica::Engenharia e Tecnologia::Engenharia QuímicaHeterogeneous photocatalysis is one of the most promising technologies for an advanced degradation of emerging pollutants in water bodies, due to the widespread availability of low-cost and efficient photocatalysts. The challenge, however, is to boost the exploitation of solar light through the use of photocatalysts with improved activity under sun irradiation. Most studies on this topic focus on the enhanced photodegradation yields achieved by the incorporation of the carbon additives. However the impact of the carbonaceous additive on the toxicity of the final effluent is scarcely addressed and little is known on the nature of the intermediates formed when the photooxidation pathway is modified. In this context, the aim of this work was to evaluate the impact of the incorporation of nanoporous carbons (either as photocatalysts or additives to semiconductors) in terms of an ecotoxicity risk assessment using phenol as a model organic pollutant. In this work it was used as catalysts TiO2, CQ and composites of TiO2 with CQ. It was measured the ecotoxicity of samples after 1, 3 and 6h of photodegradation for synthetic samples of phenol and wastewater from industrial origin. The results are interpreted in terms of the ecotoxicity of the solutions obtained after the photocatalytic assays by using the bioluminescence inhibition of the bacterium Vibrio fischeri, while exploring the role of the carbon component features (i.e. structure, texture) on the performance of the semiconductor/carbon photocatalysts, TiO2 using semiconductors. For both synthetic and real wastewater samples the lower ecotoxicity values were achieved after 6 hours of irradiation with the CQ as catalyst. The results with real samples have also shown that photodegradation assays performed with hybrid semiconductor/nanoporous carbon catalysts can be more effective than the semiconductors alone or photolysis.Ovín Ania, María ConcepciónFonseca, IsabelRUNLourenço, Vânia Alexandra Fernandes2018-09-01T00:30:27Z2017-092017-102017-09-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10362/24548enginfo:eu-repo/semantics/embargoedAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-03-11T04:12:43Zoai:run.unl.pt:10362/24548Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:28:04.402198Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Evaluation of ecotoxicological properties of industrial wastewater after photocatalytic treatment |
title |
Evaluation of ecotoxicological properties of industrial wastewater after photocatalytic treatment |
spellingShingle |
Evaluation of ecotoxicological properties of industrial wastewater after photocatalytic treatment Lourenço, Vânia Alexandra Fernandes Ecotoxicity Photocatalysis Carbons Phenol TiO2 Vibrio fischeri Domínio/Área Científica::Engenharia e Tecnologia::Engenharia Química |
title_short |
Evaluation of ecotoxicological properties of industrial wastewater after photocatalytic treatment |
title_full |
Evaluation of ecotoxicological properties of industrial wastewater after photocatalytic treatment |
title_fullStr |
Evaluation of ecotoxicological properties of industrial wastewater after photocatalytic treatment |
title_full_unstemmed |
Evaluation of ecotoxicological properties of industrial wastewater after photocatalytic treatment |
title_sort |
Evaluation of ecotoxicological properties of industrial wastewater after photocatalytic treatment |
author |
Lourenço, Vânia Alexandra Fernandes |
author_facet |
Lourenço, Vânia Alexandra Fernandes |
author_role |
author |
dc.contributor.none.fl_str_mv |
Ovín Ania, María Concepción Fonseca, Isabel RUN |
dc.contributor.author.fl_str_mv |
Lourenço, Vânia Alexandra Fernandes |
dc.subject.por.fl_str_mv |
Ecotoxicity Photocatalysis Carbons Phenol TiO2 Vibrio fischeri Domínio/Área Científica::Engenharia e Tecnologia::Engenharia Química |
topic |
Ecotoxicity Photocatalysis Carbons Phenol TiO2 Vibrio fischeri Domínio/Área Científica::Engenharia e Tecnologia::Engenharia Química |
description |
Heterogeneous photocatalysis is one of the most promising technologies for an advanced degradation of emerging pollutants in water bodies, due to the widespread availability of low-cost and efficient photocatalysts. The challenge, however, is to boost the exploitation of solar light through the use of photocatalysts with improved activity under sun irradiation. Most studies on this topic focus on the enhanced photodegradation yields achieved by the incorporation of the carbon additives. However the impact of the carbonaceous additive on the toxicity of the final effluent is scarcely addressed and little is known on the nature of the intermediates formed when the photooxidation pathway is modified. In this context, the aim of this work was to evaluate the impact of the incorporation of nanoporous carbons (either as photocatalysts or additives to semiconductors) in terms of an ecotoxicity risk assessment using phenol as a model organic pollutant. In this work it was used as catalysts TiO2, CQ and composites of TiO2 with CQ. It was measured the ecotoxicity of samples after 1, 3 and 6h of photodegradation for synthetic samples of phenol and wastewater from industrial origin. The results are interpreted in terms of the ecotoxicity of the solutions obtained after the photocatalytic assays by using the bioluminescence inhibition of the bacterium Vibrio fischeri, while exploring the role of the carbon component features (i.e. structure, texture) on the performance of the semiconductor/carbon photocatalysts, TiO2 using semiconductors. For both synthetic and real wastewater samples the lower ecotoxicity values were achieved after 6 hours of irradiation with the CQ as catalyst. The results with real samples have also shown that photodegradation assays performed with hybrid semiconductor/nanoporous carbon catalysts can be more effective than the semiconductors alone or photolysis. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-09 2017-10 2017-09-01T00:00:00Z 2018-09-01T00:30:27Z |
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.uri.fl_str_mv |
http://hdl.handle.net/10362/24548 |
url |
http://hdl.handle.net/10362/24548 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
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info:eu-repo/semantics/embargoedAccess |
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embargoedAccess |
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application/pdf |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799137907249774592 |