Parameters affecting the properties of dynamic membranes formed by Zr hydroxide colloids

M. Rumyantsev*, A. Shauly, S. G. Yiantsios, D. Hasson, A. J. Karabelas, R. Semiat

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

16 Scopus citations

Abstract

Membranes exhibiting separation properties similar to those of conventional UF membranes can be dynamically prepared on a porous substrate by in-situ deposition of particles from a circulating colloidal suspension of certain hydrous oxides, notably Zr hydroxide. The objective of this work is to elucidate parameters affecting Zr hydroxide colloidal properties in order to determine optimal conditions for dynamic membrane (DM) formation on substrates of different porosity. The main parameters studied were the effects of pH, Zr concentration and ionic strength on colloidal properties. The main results were as follows. Over the pH range from 3 to 4, a stable mono-disperse colloidal dispersion was obtained, composed of sub-micron particles. The particle size increased systematically with the pH level of the suspension. At a pH value of near 4, a bi-modal distribution was obtained, composed of both sub-micron particles and very large agglomerates. At pH values higher than about 4.5, large agglomerates formed instantly. Particle agglomeration was also affected by the ionic strength of the solution and the procedure of the colloid preparation. The above results find full support in the flow and separation properties displayed by DM prepared with Zr suspensions of different chemistries (notably the pH level) on two types of substrates: a porous fabric having a pore size of tens of microns and a microfiltration membrane having a pore size of a few microns.

Original languageEnglish
Pages (from-to)189-200
Number of pages12
JournalDesalination
Volume131
Issue number1-3
DOIs
StatePublished - 20 Dec 2000
Externally publishedYes
EventMembranes in Drinking and Industrial Water Production - Paris, France
Duration: 3 Oct 20006 Oct 2000

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