Next Article in Journal
Photoactive Gel for Assisted Cleaning during Olive Mill Wastewater Membrane Microfiltration
Previous Article in Journal
Characterization and Antibiofouling Performance Investigation of Hydrophobic Silver Nanocomposite Membranes: A Comparative Study
Article Menu

Export Article

Open AccessArticle
Membranes 2017, 7(4), 65; https://doi.org/10.3390/membranes7040065

Modification of the Selectivity Properties of Tubular Ceramic Membranes after Alkaline Treatment

1
IS2M (UMR CNRS 7228), Université de Haute Alsace, 3 bis rue A. Werner, 68093 Mulhouse CEDEX, France
2
TAMI-Industries, Z.A. Les Laurons CS65, 26111 Nyons CEDEX, France
3
Institut UTINAM Besançon (UMR CNRS 6213), Université de Bourgogne Franche-Comté, 16 Route de Gray, 25030 Besançon CEDEX, France
*
Author to whom correspondence should be addressed.
Received: 23 October 2017 / Revised: 13 November 2017 / Accepted: 16 November 2017 / Published: 21 November 2017
(This article belongs to the Section Membrane Applications in Industry and Chemical Analysis)
Full-Text   |   PDF [4074 KB, uploaded 21 November 2017]   |  

Abstract

This work focuses on the selectivity modification of ceramic membranes after a mild alkaline treatment. Filtration of pure salt-water solutions was carried out with commercial titania membranes before and after the treatment. After treatment, the rejection of NaF significantly decreased, while the rejection of NaCl and NaBr increased. Additionally, NaI and Na2SO4 remained close to zero. Pore size and electrical charge being almost unchanged, only significant modifications in the dielectric effects can explain this modification of selectivity. Therefore, the surface chemistry and the interaction (nature and magnitude) with the solvent and with the species present in the solution appear to be modified by the alkaline treatment. This trend is also illustrated by discussing the electric and the dielectric properties that were numerically identified before and after treatment. The alkaline treatment significantly decreased the apparent dielectric constant of NaCl-water solution in the pore, highlighting the rejection of sodium chloride. Contrariwise, the modification of the surface chemistry increased the apparent dielectric constant of NaF-water solution by promoting fluoride transmission. View Full-Text
Keywords: TiO2 membrane; pure salt-water filtration; polarisability; rejection sequence; dielectric effects TiO2 membrane; pure salt-water filtration; polarisability; rejection sequence; dielectric effects
Figures

Graphical abstract

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Dutournié, P.; Limousy, L.; Anquetil, J.; Déon, S. Modification of the Selectivity Properties of Tubular Ceramic Membranes after Alkaline Treatment. Membranes 2017, 7, 65.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Membranes EISSN 2077-0375 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top