Batch stirred tank experiments were carried out to study the effect of pH (range 2-10, at 294 K) and temperature (277, 294 and 313 K, at pH 5) on the uptake of Hg2+ ions by ETS-4 microporous titanosilicate. Changes in the p H have a significant effect on the ETS-4 uptake efficiency, the optima I range being 4-6. Due to competition effects, the chemical used to adjust the pH of the Hg2+ solution also influences the uptake efficiency. Thermodynamic parameters for the uptake of Hg2+ ions were calculated. For the temperature range Studied, the Hg2+ sorption increased with decreasing temperature. (C) 2009 Elsevier B.V. All rights reserved.