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The role of adsorption on nanofiltration of azo dyes

2005Journal article Open access
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dc.contributor.authorGomes, Arlindo Caniçopt
dc.contributor.authorPinho, Maria Norberta dept
dc.date.accessioned2010-04-28T10:07:37Z
dc.date.available2010-04-28T10:07:37Z
dc.date.issued2005
dc.description.abstractThe influence of osmotic pressure and solute adsorption on permeate flux during nanofiltration (NF) of a wool textile dye solution was investigated. Solutions of C.I. Acid Orange 7 with concentrations ranging from 2 to 2000 mg/l were subjected to nanofiltration with a NF45 membrane. An increase of flux decline with dye concentration was observed. The resistance-in-series model gives evidence that the main factor causing this flux decline is the solute adsorption. This is reinforced by the increase in the apparent rejection with dye concentration. Although osmotic pressure was taken into account, its contribution to a decrease of the driving force seems not to be significant. Adsorption resistance was calculated from a correlation between the pure water fluxes, measured before and after the essays, and feed dye concentration. A Langmuir isotherm type curve agreed well with experimental data. From the solution-diffusion model, the intrinsic rejection coefficient can be predicted as function of feed dye concentration.pt
dc.identifier.urihttp://hdl.handle.net/10400.6/648
dc.languageeng
dc.subjectTextile industrypt
dc.subjectNanofiltrationpt
dc.subjectSolution-diffusion modelpt
dc.subjectAzo dyespt
dc.subjectAdsorptionpt
dc.titleThe role of adsorption on nanofiltration of azo dyespt
dc.typejournal article
dspace.entity.typePublication
oaire.citation.issue255pt
oaire.citation.titleJournal of Membrane Sciencept
rcaap.rightsopenAccess
rcaap.typearticlept

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