Adsorption Kinetics of Dye Molecules on Polymer Membrane Filters

Abstract

e kinetics of the adsorption of dye molecules on membrane filters made of cellulose nitrate have been studied. In order to obtain thermodynamical data the temperature has been varied from 283 K to 333 K. Because kinetic laws of 1. or 2. order cannot describe the experimental results two different theories were applied. In addition to a classical concept a new equation based on the fractal theory has been checked and has proved to be suitable for adsorption data. We have shown that obtained fractal parameters, fractal dimension Ds and fractal dimension Df, are in excellent agreement with other fractal kinetics experiments.

Adsorption isotherm models for basic dye adsorption by peat in single and binary component systems

“…In relation to adsorption systems involving the extraction of large organic compounds and dyes from aqueous solution the Langmuir and Freundlich isotherm expressions are most commonly used [40][41][42][43]. However, in adsorption systems, the relative size of the sorbate molecule and the molecular sieving effect of the sorbent have been shown to affect the equilibrium of the system [44][45][46].…”

A New Pigment Type: Colored Diblock Copolymer−Mica Composites

“…Indeed, the control of color plays an important role in the conception of products and objects of daily life (cosmetics, tissues, painted papers, ceramics, etc.). In this field, incorporation of dyes in a variety of materials has been already investigated in various systems such as membrane filters, inorganic particles, clay, and DNA …”

Adsorption of Fluorescent Dyes on Oxide Nanoparticles Studied by Fluorescence Correlation Spectroscopy

“…Inorganic colloidal particles such as silica or alumina are present in natural water reservoirs, where they are carriers of adsorbed pollutant as well as vital molecules. − The knowledge of adsorption equilibrium between particles and small molecules is thus important for both fundamental (modeling of natural processes) and practical (labeling of particles) applications. A Langmuir isotherm has already been used to describe the adsorption of Rhodamine 6G (R6G) onto polymer membrane, biological cells, and anionic polystyrene latex particles. − In particular electrostatic interactions were found to play an important role on the adsorption on anionic polystyrene latex particles at low R6G dye concentration (8 × 10 -8 to 8 × 10 -5 M) . Usually such investigations are performed by centrifuging the particle suspension and measuring of the fluorescent intensity of the supernatant solution.…”

“…[4][5][6] The knowledge of adsorption equilibrium between particles and small molecules is thus important for both fundamental (modeling of natural processes) and practical (labeling of particles) applications. A Langmuir isotherm 7 has already been used to describe the adsorption of Rhodamine 6G (R6G) onto polymer membrane, 8 biological cells, 9 and anionic polystyrene latex particles. [1][2][3] In particular electrostatic interactions were found to play an important role on the adsorption on anionic polystyrene latex particles at low R6G dye concentration (8 × 10 -8 to 8 × 10 -5 M).…”