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dc.contributor.authorda Silva, Vinicius Luiz [UNESP]
dc.contributor.authorDilarri, Guilherme [UNESP]
dc.contributor.authorMendes, Carolina Rosai [UNESP]
dc.contributor.authorLovaglio, Roberta Barros
dc.contributor.authorGonçalves, Adilson Roberto [UNESP]
dc.contributor.authorMontagnolli, Renato Nallin
dc.contributor.authorContiero, Jonas [UNESP]
dc.identifier.citationJournal of Molecular Liquids, v. 321.
dc.description.abstractRhamnolipids are a class of glycolipid biosurfactants with several applications, including the bioremediation of pollutant substances. However, little is known about its application in the treatment of textile effluents. Therefore, this work aims to apply a rhamnolipid-type biosurfactant to improve the sorption of the Direct Orange 2GL textile dye. The adsorption isotherms, kinetics, and thermodynamics were investigated from a novel approach. The adsorbate/adsorbent ratio was also characterized by FT-IR spectroscopy. Bioassays using Daphnia similis verified changes in toxicity after the dye underwent the proposed treatment. The adsorption dataset was better adjusted to the Langmuir model, which indicated a strong chemical interaction coming from a finite number of binding sites. The adsorption was only possible at acidic pH. Kinetic studies further demonstrated that the adsorption equilibrium is achieved in 60 min when 1.181 μg mg−1 of dye was adsorbed by the adsorbent. Thermodynamics showed that the adsorption process was proportionally influenced by higher temperatures. The thermodynamics studies also showed a spontaneous and endothermic sorption process. The FT-IR spectroscopy identified the adsorbate/adsorbent binding sites, proving that the bond between the dye and rhamnolipid occurred through the hydrogen bonds. The recovery of both dye and rhamnolipid after the adsorption was also efficient, as more than 50% of the adsorbed dye was recovered. The post-treatment bioassays using D. similis found a significant decrease in toxicity, yielding less than 30% mortality rate after adsorption. It is concluded that the rhamnolipid was an effective adsorbent and it is a viable component to treat effluents containing textile dyes.en
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.relation.ispartofJournal of Molecular Liquids
dc.subjectDaphnia similis
dc.titleRhamnolipid from Pseudomonas aeruginosa can improve the removal of Direct Orange 2GL in textile dye industry effluentsen
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.description.affiliationDepartment of General and Applied Biology Sao Paulo State University (UNESP), 24-A Avenue, 1515
dc.description.affiliationNatural Sciences Center Federal University of Sao Carlos (UFSCar), SP-189, km 12
dc.description.affiliationInstitute for Research in Bioenergy Sao Paulo State University (UNESP), 24-A Avenue, 1515
dc.description.affiliationDepartment of Natural Sciences Mathematics and Education Agricultural Sciences Centre Federal University of Sao Carlos (UFSCar), SP-330, km 174
dc.description.affiliationUnespDepartment of General and Applied Biology Sao Paulo State University (UNESP), 24-A Avenue, 1515
dc.description.affiliationUnespInstitute for Research in Bioenergy Sao Paulo State University (UNESP), 24-A Avenue, 1515
dc.description.sponsorshipIdCNPq: 130621/2016-1
dc.description.sponsorshipIdFAPESP: 2015/1444-2
dc.description.sponsorshipIdCNPq: 302935/2015-0
dc.description.sponsorshipIdCAPES: 88881.132117/2016-01
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