Work

Dielectric properties of electrolyte solutions in polymeric nanofiltration membranes

Year: 2011

Type: article

Abstract: In this work a nanofiltration membrane immersed in an electrolyte solution has been studied using impedance spectroscopy. In this technique the membrane is in contact with the same concentration at both sides, therefore there is not any ion transport through the membrane and, thus, it is possible to obtain electric and dielectric properties that would help to model the nanofiltration process. Results allow obtaining the electrical properties of the whole system assumed as consisting in an equivalent electric circuit. Three relaxation times can be identified and modeled with the aim of understanding the behavior of the solution inside the pores as a function of concentration. The pore permittivity decreases with increasing concentration due to confinement effects, while the conductivity inside the pores increases rapidly for high concentrations due to the easy penetration of the ions into the pores.

Source: Desalination and Water Treatment

DOI: 10.5004/dwt.2011.2040

Authors: Miguel Montalvillo, Verónica Silva, Laura Palacio, Antonio Hernández, Pedro Prádanos

Institutions: Universidad de Valladolid, Consejo Superior de Investigaciones Científicas

Language: English

Topic: Membrane Separation Technologies

Subfield: Water Science and Technology

Field: Environmental Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $1,000

Funder: Junta de Castilla y León