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Previous issue date: 2016-09-09 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / A industrializa??o e urbaniza??o progressiva t?m aumentado a
quantidade de carga poluidora no ambiente e deixado exposto o homem, a fauna e a
flora cada vez mais a essa polui??o. Com isso a preocupa??o que se tem com o
meio ambiente ? cada vez mais not?ria, pois a falta de cuidado com o mesmo, gera
danos irrevers?veis. A ind?stria t?xtil ? uma das grandes causadoras de danos ao
meio ambiente. Os efluentes oriundos dessa ind?stria trazem consigo uma
quantidade enorme de carga poluidora, entre elas est?o os corantes, que adere cor
aos substratos t?xteis. Portanto tanto o adsorvente quanto o adsorbato foram
analisados por fluoresc?ncia de raios X (FRX), para verificar a composi??o qu?mica
do material; difra??o de raios X (DRX), para verificar as fases formadas;
espectroscopia de infravermelho, para determinar os grupos funcionais; an?lises
t?rmicas, para verificar a estabilidade t?rmica dos materiais; e microscopia de
varredura (MEV), para verificar a morfologia do material; espectroscopia de
ultravioleta ? vis?vel (UV), para medir o quanto de luz foi absorvida pela amostra;
bem como analisou-se o tempo de satura??o da quitosana em rela??o ao corante.
Como resultado, observou-se que a quitosana ? bastante eficiente para a adsor??o
do corante em estudo. Em apenas 90 minutos, a um pH 6, a quitosana saturou e
adsorveu 97,73% do corante contido na solu??o. A adsor??o ? mais eficiente para
valores de pH mais ?cidos e para o tempo de satura??o obtido a massa de
adsorvente desej?vel ? acima de 0,1g. Al?m desses resultados foi feito um estudo
em rela??o as isotermas de adsor??o de Langmuir e Freundlich, e a equa??o que
mais se adequou ao processo foi a de Langmuir, com fator adimensional de 0,058,
indicando que o processo de adsor??o foi favor?vel. / Industrialization and urbanization have gradually increased the amount
of pollution load on the environment and left exposed the man, fauna and flora,
increasingly this pollution. With that concern you have with the environment is
becoming more apparent because of the lack of care with it, generates irreversible
damage. The textile industry is a major cause of environmental damage. The
effluents from the industry bring with them a huge amount of pollution load, among
them are the dyes that color adheres to textile substrates. Therefore both the
adsorbent and the adsorbate was analyzed by X-ray fluorescence (XRF), to verify the
chemical composition of the material; X-ray diffraction (XRD) to verify the phases
formed; infrared spectroscopy to determine functional groups; Thermal analysis to
verify the thermal stability of the materials; and microscopy (SEM) to verify the
morphology of the material; spectroscopy ultraviolet - visible (UV) light , to measure
how much light has been absorbed by the sample; and analyzed chitosan saturation
time in relation to the dye. As a result, it was found that chitosan is quite effective for
adsorbing the dye in the study. In just 90 minutes, the pH 6, and saturated chitosan
adsorbed 97.73% of the dye contained in the solution. The adsorption is more
efficient to more acidic pH values and the saturation time obtained, the desired
adsorbent mass is above 0.1g. In addition to these results was studied in relation to the Langmuir adsorption
isotherms Freundlich equation and is further adapted to process was the Langmuir
with dimensionless factor of 0.058 , indicating that the adsorption process was
favorable .
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/22556 |
| Date | 09 September 2016 |
| Creators | Rodrigues, Patr?cia Alves Sobrinho |
| Contributors | 04514998320, http://lattes.cnpq.br/5840621182000517, Braga, Renata Martins, 05165674460, http://lattes.cnpq.br/4603529162393328, Santiago, Rodrigo C?sar, 05345915407, http://lattes.cnpq.br/6823966481089536, Melo, V?tor Rodrigo de Melo e, 05298014429, http://lattes.cnpq.br/0892282595815754, Melo, Marcus Antonio de Freitas |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM CI?NCIA E ENGENHARIA DE MATERIAIS, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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