Repository logo
 
Publication

Utilização de bagaço de uva na remoção da cor em soluções aquosas

dc.contributor.authorCanelo, Laura Isabel Nave
dc.date.accessioned2014-05-21T11:19:26Z
dc.date.available2014-05-21T11:19:26Z
dc.date.issued2009-06
dc.descriptionEntre as tecnologias orientadas para o tratamento de efluentes contendo corantes, principalmente do grupo azo, destaca-se o processo de adsorção utilizando como adsorvente o bagaço de uva que é um subproduto originado nas indústrias vitivínicolas. O presente trabalho tem como objectivo primeiro a aplicação deste material de baixo custo na remoção de corantes em efluentes industriais.por
dc.description.abstractGrape bagasse generated in wine production can be used as a potential biosorbent for colour removal. Batch experiments were carried out for kinetic studies of textile dyes Acid Orange 7 (AO7) and Direct Red 80 (DR80) onto dried grape bagasse, at pH of 7-7.5. For dye AO7 the influence of initial dye concentration (from 20 to 100 mg/), temperature (20, 37 and 50ºC) and contact time was evaluated. A maximum efficiency rate (ca. 89%) was found for 2.5g of biosorbent in tests with a 20 ml solution /g biosorbent. Kinetic studies show that, at 50ºC, experimental data are well described by a pseudo second order model. However, the rate-limiting step of the process at 37ºC appears to be the internal diffusion. At 20ºC both processes are determinant. The equilibrium data were fitted to the Langmuir, Freundlich and Langmuir-Freundlich isotherms. Langmuir and Langmuir-Freundlich were considered as those that better describe the equilibrium results. The adsorption capacities ranged from 2,7 a 3,5 mg de AO7/g biosorbent. Dye DR80 displayed a lower efficient colour removal rate (ca. 43%) than AO7 in similar test conditions, which could be due to the type of solute-sorbent interactions, since DR80 is a linear molecule with a higher hydrophilic character. Results show that grape bagasse could be employed as a low-cost adsorbent on colour removal.por
dc.identifier.urihttp://hdl.handle.net/10400.6/1743
dc.language.isoporpor
dc.publisherUniversidade da Beira Interiorpor
dc.relation.publisherversionhttp://catalogo.ubi.pt/cgi-bin/koha/opac-ISBDdetail.pl?biblionumber=86078por
dc.subjectBagaço de uva - Absorvente de corantes Cinética Adsorção Biosorção - Corantes Azopor
dc.titleUtilização de bagaço de uva na remoção da cor em soluções aquosaspor
dc.typemaster thesis
dspace.entity.typePublication
oaire.citation.conferencePlaceUniversidade da Beira Interiorpor
oaire.citation.titleUtilização de bagaço de uva na remoção da cor em soluções aquosaspor
rcaap.rightsopenAccesspor
rcaap.typemasterThesispor

Files

Original bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
Tese de mestrado Laura Isabel Nave Canelo.pdf
Size:
2.65 MB
Format:
Adobe Portable Document Format
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description: