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dc.contributor.CRUESPUNIVERSIDADE DE ESTADUAL DE CAMPINASpt_BR
dc.typeArtigo de periódicopt_BR
dc.titleChitosan And Alginate Biopolymer Membranes For Remediation Of Contaminated Water With Herbicides.pt_BR
dc.contributor.authorAgostini de Moraes, Marianapt_BR
dc.contributor.authorCocenza, Daniela Sgarbipt_BR
dc.contributor.authorda Cruz Vasconcellos, Fernandopt_BR
dc.contributor.authorFraceto, Leonardo Fernandespt_BR
dc.contributor.authorBeppu, Marisa Masumipt_BR
unicamp.authorMariana Agostini de Moraes, School of Chemical Engineering, University of Campinas - UNICAMP, Av. Albert Einstein, 500, Cidade Universitária Zeferino Vaz, 13083-852 Campinas, SP, Brazil. Electronic address: marimoraes@feq.unicamp.br.pt_BR
unicamp.author.externalDaniela Sgarbi Cocenza,pt
unicamp.author.externalFernando da Cruz Vasconcellos,pt
unicamp.author.externalLeonardo Fernandes Fraceto,pt
unicamp.author.externalMarisa Masumi Beppu,pt
dc.subjectAdsorptionpt_BR
dc.subjectAlginatespt_BR
dc.subjectBiopolymerspt_BR
dc.subjectChitosanpt_BR
dc.subjectGlucuronic Acidpt_BR
dc.subjectHerbicidespt_BR
dc.subjectHexuronic Acidspt_BR
dc.subjectWater Pollutants, Chemicalpt_BR
dc.subjectAdsorptionpt_BR
dc.subjectAlginatept_BR
dc.subjectChitosanpt_BR
dc.subjectMultilayerpt_BR
dc.description.abstractThis study investigated the adsorption behavior of the herbicides diquat, difenzoquat and clomazone on biopolymer membranes prepared with alginate and chitosan (pristine and multi-layer model) for contaminated water remediation applications. Herbicides, at concentrations ranging from 5 μM to 200 μM, were adsorbed in either pure alginate, pure chitosan or a bilayer membrane composed of chitosan/alginate. No adsorption of clomazone was observed on any of the membranes, probably due to lack of electrostatic interactions between the herbicide and the membranes. Diquat and difenzoquat were only adsorbed on the alginate and chitosan/alginate membranes, indicating that this adsorption takes place in the alginate layer. At a concentration of 50 μM, diquat adsorption reaches ca. 95% after 120 min on both the alginate and chitosan/alginate membranes. The adsorption of difenzoquat, at the same concentration, reaches ca. 62% after 120 min on pure alginate membranes and ca. 12% on chitosan/alginate bilayer membranes. The adsorption isotherms for diquat and difenzoquat were further evaluated using the isotherm models proposed by Langmuir and by Freundlich, where the latter represented the best-fit model. Results indicate that adsorption occurs via coulombic interactions between the herbicides and alginate and is strongly related to the electrostatic charge, partition coefficients and dissociation constants of the herbicides. Biopolymer based membranes present novel systems for the removal of herbicides from contaminated water sources and hold great promise in the field of environmental science and engineering.en
dc.relation.ispartofJournal Of Environmental Managementpt_BR
dc.relation.ispartofabbreviationJ. Environ. Manage.pt_BR
dc.date.issued2013-Decpt_BR
dc.identifier.citationJournal Of Environmental Management. v. 131, p. 222-7, 2013-Dec.pt_BR
dc.language.isoengpt_BR
dc.description.volume131pt_BR
dc.description.firstpage222-7pt_BR
dc.rightsfechadopt_BR
dc.rights.holderCopyright © 2013 Elsevier Ltd. All rights reserved.pt_BR
dc.sourcePubMedpt_BR
dc.identifier.issn1095-8630pt_BR
dc.identifier.doi10.1016/j.jenvman.2013.09.028pt_BR
dc.identifier.urlhttp://www.ncbi.nlm.nih.gov/pubmed/24178315pt_BR
dc.date.available2015-11-27T13:32:17Z-
dc.date.accessioned2015-11-27T13:32:17Z-
dc.description.provenanceMade available in DSpace on 2015-11-27T13:32:17Z (GMT). No. of bitstreams: 1 pmed_24178315.pdf: 865737 bytes, checksum: 9cabb375c978912934dbe1dc8378a059 (MD5) Previous issue date: 2013en
dc.identifier.urihttp://repositorio.unicamp.br/jspui/handle/REPOSIP/200873-
dc.identifier.idPubmed24178315pt_BR
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