Locus  

Adsorption of the herbicides diquat and difenzoquat on polyurethane foam: kinetic, equilibrium and computational studies

Show simple item record

dc.contributor.author Vinhal, Jonas O.
dc.contributor.author Nege, Kassem K.
dc.contributor.author Lage, Mateus R.
dc.contributor.author Carneiro, José Walkimar de M.
dc.contributor.author Lima, Claudio F.
dc.contributor.author Cassella, Ricardo J.
dc.date.accessioned 2018-06-04T10:54:35Z
dc.date.available 2018-06-04T10:54:35Z
dc.date.issued 2017-08-09
dc.identifier.issn 01476513
dc.identifier.uri http://dx.doi.org/10.1016/j.ecoenv.2017.08.005
dc.identifier.uri http://www.locus.ufv.br/handle/123456789/19893
dc.description.abstract This work reports a study about the adsorption of the herbicides diquat and difenzoquat from aqueous medium employing polyurethane foam (PUF) as the adsorbent and sodium dodecylsulfate (SDS) as the counter ion. The adsorption efficiency was shown to be dependent on the concentration of SDS in solution, since the formation of an ion-associate between cationic herbicides (diquat and difenzoquat) and anionic dodecylsulfate is a fundamental step of the process. A computational study was carried out to identify the possible structure of the ion-associates that are formed in solution. They are probably formed by three units of dodecylsulfate bound to one unit of diquat, and two units of dodecylsulfate bound to one unit of difenzoquat. The results obtained also showed that 95% of both herbicides present in 45 mL of a solution containing 5.5 mg L^−1 could be retained by 300 mg of PUF. The experimental data were well adjusted to the Freundlich isotherm (r^2 ≥ 0.95) and to the pseudo-second-order kinetic equation. Also, the application of Morris-Weber and Reichenberg equations indicated that an intraparticle diffusion process is active in the control of adsorption kinetics. en
dc.language.iso eng pt-BR
dc.publisher Ecotoxicology and Environmental Safety pt-BR
dc.relation.ispartofseries v. 145, p. 597-604, Novembro 2017 pt-BR
dc.rights Elsevier Inc. pt-BR
dc.subject Adsorption pt-BR
dc.subject Kinetic modeling pt-BR
dc.subject Diquat pt-BR
dc.subject Difenzoquat pt-BR
dc.subject Polyurethane foam pt-BR
dc.title Adsorption of the herbicides diquat and difenzoquat on polyurethane foam: kinetic, equilibrium and computational studies en
dc.type Artigo pt-BR


Files in this item

This item appears in the following Collection(s)

  • Artigos [378]
    Artigos Técnico-científicos na área de Química

Show simple item record

Search DSpace


Browse

My Account