Research Papers by K. Keizer

Three commercial membranes (NF70, NF90 and TFC-SR) were firstly characterized in terms of pure water flux and the rejection of uncharged (alcohols and sugars) compounds. Subsequently, the rejection of monovalent (sodium and chloride) and divalent (calcium and sulphate) ions in single (NaCl, CaCl2 an

The aim of this work is the development of inorganic membranes that will enable broad application of pervaporation/vapour permeation technology in the chemical industry. This can be achieved by improvement of the existing microporous membranes and the development of new types with enhanced thermoche

A new type of ion-selective ceramic membrane with electrically tuneable selectivity is reported. The membrane consists of a conventional supported γ-alumina membrane with porous gold electrodes sputtered on both sides. An electrical potential difference can be applied over the electrodes. The transp

The development of membranes for polyoxometalate (POM) recycling based on charge or size effects is described. POM recycling via nanofiltration with surface charge membranes is a new approach. From the properties of solute–membrane interaction three different kinds of nanofiltration membranes have b

Mine water, specifically from gold and coal mines in South Africa, contains large quantities (up to 3 g/l = 3000 ppm) of sulphate and can be very acidic (pH 2-4 ). A study was done to investigate the performance of commercially available nanofiltration (NF) membranes for the removal of sulphates and