Adsorption of Metanil Yellow on a positively charge-modified nylon 66 membrane

Der'E E. Jan, Srini Raghavan

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

The adsorption of Metanil Yellow (3-{[4-(phenylamino) phenyl] azo}benzenesulfonate) on a commercially available, positively charged modified nylon 66 membrane (N66 Posidyne) with an isoelectric point of 7.6 was investigated. The experiments were carried out in a specially designed streaming potential cell to follow changes in the streaming potential of the membrane during adsorption. The extent of adsorption was determined from the breakthrough behavior of the dye which was characterized by analyzing the concentration of the dye in the effluent stream using a spectrophotometric technique. At a pH of 5.1, the adsorption of Metanil Yellow was found to increase with its solution concentration and reached a saturation value of 2.2 × 1014 ions cm-2 at a solution concentration of 1.49 × 10-5 M. The reversal of the streaming potential of the membrane occurred at solution concentrations greater than 4.7 × 10-7 M, indicating that the dye adsorption was controlled by electrostatic as well as specific adsorption forces. Using the Stern-Grahame equation, a specific adsorption potential of about -7.5 kcal mol-1 was calculated from the experimental data.

Original languageEnglish (US)
Pages (from-to)1-7
Number of pages7
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume92
Issue number1-2
DOIs
StatePublished - Nov 10 1994

Keywords

  • Adsorption
  • Charge-modified nylon
  • Metanil Yellow
  • Streaming potential
  • Zeta potential

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

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