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Master's Dissertation
Document
Author
Full name
Patrícia Muniz dos Santos Silva
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2018
Supervisor
Committee
Costa, Sirlene Maria da (President)
Araújo, Geórgia Christina Labuto
Borelli, Camilla
Francisco, Kelliton José Mendonça
Title in Portuguese
Corantes naturais das cascas das árvores Stryphnodendron adstringens (Mart.) Coville e Croton urucurana Baill., nativas do Brasil: extração, tingimento, solidez de cor e caracterização do efluente
Keywords in Portuguese
Bioeconomia
Corante natural
Espécie nativa
Indústria têxtil
Tingimento
Abstract in Portuguese
Esse trabalho objetivou investigar o potencial dos extratos aquosos das cascas de barbatimão (Stryphnodendron adstringens (Mart.) Coville) e sangra dágua (Croton urucurana Baill.) como corante natural têxtil. Os extratos foram caracterizados quanto ao pH, o teor de sólidos totais e a estabilidade no armazenamento. Os extratos foram liofilizados e avaliados por espectroscopia no infravermelho com transformada de Fourier (FTIR), termogravimetria (TG) e calorimetria exploratória diferencial (DSC). Foram realizados experimentos preliminares de tingimento em tecidos multifibra e em diferentes concentrações dos extratos. A partir desses experimentos, foram definidas as variáveis temperatura, tempo e concentração do extrato para o estudo do tingimento por planejamento experimental 2³, em tecidos 100 % algodão e 100 % lã. Os tecidos tingidos em condição otimizada, sem e com mordentes metálicos, foram avaliados quanto à cor, a solidez de cor à luz, à lavagem, à fricção e ao suor. Os efluentes foram coletados e caracterizados quanto ao pH, turbidez, sólidos totais dissolvidos (STD), oxigênio dissolvido, demanda bioquímica de oxigênio (DBO), demanda química de oxigênio (DQO) e teores de ferro e alumínio dissolvidos. Foram conduzidos ensaios bacteriológicos nos extratos aquosos, etanólicos e liofilizados e nos tecidos tingidos. Os resultados das análises por FTIR indicaram a presença de taninos, lignina e celulose nos extratos. Pelo estudo de estabilidade os extratos possuem duração de 42 dias. Nas análises por TG, os extratos obtiveram perda de massa total similares e não geraram alteração na degradação dos tecidos tingidos. Na análise por DSC os extratos obtiveram picos endotérmico e exotérmixo em temperaturas próximas. As melhores condições para o tingimento dos tecidos avaliados é em 98 °C, por 60 min e na concentração de 100 % do extrato. A solidez de cor dos tecidos tingidos variou de baixa a excelente. Os extratos liofilizados apresentaram propriedades antibacterianas. Os efluentes apresentaram valores de STD, DBO, DQO e alumínio e ferro dissolvidos acima dos limites determinados pela legislação nacional. De modo geral, os resultados obtidos indicam que os extratos das cascas de barbatimão e sangra dágua são promissores para serem utilizados como corantes naturais têxteis
Title in English
Natural dyes from trees barks Stryphnodendron adstringens (Mart.) Coville and Croton urucurana Baill., native to Brazil: extraction, dyeing, color fastness and wastewater characterization
Keywords in English
Bioeconomics
Dyeing
Native species
Natural dye
Textile industry
Abstract in English
This research aimed to investigate the potential of aqueous extracts of barbatimão (Stryphnodendron adstringens (Mart.) Coville) and sangra dágua (Croton urucurana Baill.) bark as natural textile dyes. The extracts were characterized for pH, total solids content and storage stability. The extracts were lyophilized and evaluated by Fourier transform infrared spectroscopy (FTIR), thermogravimetry (TG) and differential scanning calorimetry (DSC). Preliminary dyeing experiments were carried out on multifiber fabrics and at different extracts concentrations. From these experiments, the variables temperature, time and concentration of the extract for the study of dyeing by experimental design 2³ in 100 % cotton and 100 % wool fabrics were defined. Fabrics dyed in optimized condition, using metal mordants and with no mordents, were evaluated by colorimetry, color fastness to light, wash, rubbing and perspiration. The effluents were collected and characterized by pH, turbidity, total dissolved solids (TDS), dissolved oxygen, biochemical oxygen demand (BOD), chemical oxygen demand (COD) and dissolved iron and aluminum contents. Bacteriological tests were conducted on aqueous, ethanolic and lyophilized extracts and on dyed fabrics. The results of the FTIR analysis indicated the presence of tannins, lignin and cellulose in the extracts. By the stability study were found that the extracts have a duration of 42 days. In the TG analyzes, the extracts obtained similar total mass loss and did not generate alteration in the degradation of the dyed fabrics. In the DSC analysis the extracts obtained endothermic and exotherm peaks at near temperatures. The optimized dyeing for the evaluated fabrics is at 98 °C for 60 min and at the concentration of 100 % of the extract. The color fastness of the dyed fabrics ranged from low to excellent. Lyophilized extracts showed antibacterial properties. The wastewater showed values of TDS, BOD, COD and aluminum and iron dissolved above the limits determined by national legislation. In general, the results indicate that barbatimão and sangra dágua extracts are promising for use as natural textile dyes
 
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Publishing Date
2018-12-06
 
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