Equilibrium and thermodynamics of azo dyes biosorption onto Spirulina platensis
Autor(a) principal: | |
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Data de Publicação: | 2013 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da FURG (RI FURG) |
Texto Completo: | http://repositorio.furg.br/handle/1/4600 |
Resumo: | The equilibrium and thermodynamics of azo dye (tartrazine and allura red) biosorption onto Spirulina platensis biomass were investigated. The equilibrium curves were obtained at 298, 308, 318 and 328 K, and four isotherm models were fitted the experimental data. Biosorption thermodynamic parameters (ΔG, ΔH and ΔS) were estimated. The results showed that the biosorption was favored by a temperature decrease. For both dyes, the Sips model was the best to represent the equilibrium experimental data (R2>0.99 and ARE<5.0%) and the maximum biosorption capacities were 363.2 and 468.7 mg g-1 for tartrazine and allura red, respectively, obtained at 298 K. The negative values of ΔG and ΔH showed that the biosorption of both dyes was spontaneous, favorable and exothermic. The positive values of ΔS suggested that the system disorder increases during the biosorption process. |
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Dotto, Guilherme LuizVieira, Mery Luiza GarciaEsquerdo, Vanessa MendonçaPinto, Luiz Antonio de Almeida2014-09-23T20:42:56Z2014-09-23T20:42:56Z2013DOTTO, Guilherme Luiz et al. Equilibrium and thermodynamics of azo dyes biosorption onto Spirulina platensis. Brazilian Journal of Chemical Engineering, v. 30, n. 1, p.13-21, jan/mar. 2013. Disponível em: <http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322013000100003&lng=en&nrm=iso&tlng=en>. Acesso em 16 jul. 2014.0104-6632http://repositorio.furg.br/handle/1/4600The equilibrium and thermodynamics of azo dye (tartrazine and allura red) biosorption onto Spirulina platensis biomass were investigated. The equilibrium curves were obtained at 298, 308, 318 and 328 K, and four isotherm models were fitted the experimental data. Biosorption thermodynamic parameters (ΔG, ΔH and ΔS) were estimated. The results showed that the biosorption was favored by a temperature decrease. For both dyes, the Sips model was the best to represent the equilibrium experimental data (R2>0.99 and ARE<5.0%) and the maximum biosorption capacities were 363.2 and 468.7 mg g-1 for tartrazine and allura red, respectively, obtained at 298 K. The negative values of ΔG and ΔH showed that the biosorption of both dyes was spontaneous, favorable and exothermic. The positive values of ΔS suggested that the system disorder increases during the biosorption process.engAbeqBiosorptionSpirulina PlatensisAzo DyesEquilibrium and thermodynamics of azo dyes biosorption onto Spirulina platensisinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da FURG (RI FURG)instname:Universidade Federal do Rio Grande (FURG)instacron:FURGORIGINAL7- EQUILIBRIUM AND THERMODYNAMICS OF AZO.pdf7- EQUILIBRIUM AND THERMODYNAMICS OF AZO.pdfapplication/pdf1511274https://repositorio.furg.br/bitstream/1/4600/1/7-%20EQUILIBRIUM%20AND%20THERMODYNAMICS%20OF%20AZO.pdf3ce4cfdd54d48ed279fa9a7de92c93d4MD51open accessLICENSElicense.txtlicense.txttext/plain; charset=utf-81748https://repositorio.furg.br/bitstream/1/4600/2/license.txt8a4605be74aa9ea9d79846c1fba20a33MD52open access1/46002019-12-03 16:55:53.929open accessoai:repositorio.furg.br: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Repositório InstitucionalPUBhttps://repositorio.furg.br/oai/request || http://200.19.254.174/oai/requestopendoar:2019-12-03T19:55:53Repositório Institucional da FURG (RI FURG) - Universidade Federal do Rio Grande (FURG)false |
dc.title.pt_BR.fl_str_mv |
Equilibrium and thermodynamics of azo dyes biosorption onto Spirulina platensis |
title |
Equilibrium and thermodynamics of azo dyes biosorption onto Spirulina platensis |
spellingShingle |
Equilibrium and thermodynamics of azo dyes biosorption onto Spirulina platensis Dotto, Guilherme Luiz Biosorption Spirulina Platensis Azo Dyes |
title_short |
Equilibrium and thermodynamics of azo dyes biosorption onto Spirulina platensis |
title_full |
Equilibrium and thermodynamics of azo dyes biosorption onto Spirulina platensis |
title_fullStr |
Equilibrium and thermodynamics of azo dyes biosorption onto Spirulina platensis |
title_full_unstemmed |
Equilibrium and thermodynamics of azo dyes biosorption onto Spirulina platensis |
title_sort |
Equilibrium and thermodynamics of azo dyes biosorption onto Spirulina platensis |
author |
Dotto, Guilherme Luiz |
author_facet |
Dotto, Guilherme Luiz Vieira, Mery Luiza Garcia Esquerdo, Vanessa Mendonça Pinto, Luiz Antonio de Almeida |
author_role |
author |
author2 |
Vieira, Mery Luiza Garcia Esquerdo, Vanessa Mendonça Pinto, Luiz Antonio de Almeida |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Dotto, Guilherme Luiz Vieira, Mery Luiza Garcia Esquerdo, Vanessa Mendonça Pinto, Luiz Antonio de Almeida |
dc.subject.por.fl_str_mv |
Biosorption Spirulina Platensis Azo Dyes |
topic |
Biosorption Spirulina Platensis Azo Dyes |
description |
The equilibrium and thermodynamics of azo dye (tartrazine and allura red) biosorption onto Spirulina platensis biomass were investigated. The equilibrium curves were obtained at 298, 308, 318 and 328 K, and four isotherm models were fitted the experimental data. Biosorption thermodynamic parameters (ΔG, ΔH and ΔS) were estimated. The results showed that the biosorption was favored by a temperature decrease. For both dyes, the Sips model was the best to represent the equilibrium experimental data (R2>0.99 and ARE<5.0%) and the maximum biosorption capacities were 363.2 and 468.7 mg g-1 for tartrazine and allura red, respectively, obtained at 298 K. The negative values of ΔG and ΔH showed that the biosorption of both dyes was spontaneous, favorable and exothermic. The positive values of ΔS suggested that the system disorder increases during the biosorption process. |
publishDate |
2013 |
dc.date.issued.fl_str_mv |
2013 |
dc.date.accessioned.fl_str_mv |
2014-09-23T20:42:56Z |
dc.date.available.fl_str_mv |
2014-09-23T20:42:56Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
DOTTO, Guilherme Luiz et al. Equilibrium and thermodynamics of azo dyes biosorption onto Spirulina platensis. Brazilian Journal of Chemical Engineering, v. 30, n. 1, p.13-21, jan/mar. 2013. Disponível em: <http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322013000100003&lng=en&nrm=iso&tlng=en>. Acesso em 16 jul. 2014. |
dc.identifier.uri.fl_str_mv |
http://repositorio.furg.br/handle/1/4600 |
dc.identifier.issn.none.fl_str_mv |
0104-6632 |
identifier_str_mv |
DOTTO, Guilherme Luiz et al. Equilibrium and thermodynamics of azo dyes biosorption onto Spirulina platensis. Brazilian Journal of Chemical Engineering, v. 30, n. 1, p.13-21, jan/mar. 2013. Disponível em: <http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322013000100003&lng=en&nrm=iso&tlng=en>. Acesso em 16 jul. 2014. 0104-6632 |
url |
http://repositorio.furg.br/handle/1/4600 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
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info:eu-repo/semantics/openAccess |
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openAccess |
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Abeq |
publisher.none.fl_str_mv |
Abeq |
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reponame:Repositório Institucional da FURG (RI FURG) instname:Universidade Federal do Rio Grande (FURG) instacron:FURG |
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Universidade Federal do Rio Grande (FURG) |
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Repositório Institucional da FURG (RI FURG) |
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