title: Effect of pH and temperature on Hg2+ water decontamination using ETS-4 titanosilicate.
abstract: 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 Hg(2+) ions by ETS-4 microporous titanosilicate. Changes in the pH have a significant effect on the ETS-4 uptake efficiency, the optimal range being 4-6. Due to competition effects, the chemical used to adjust the pH of the Hg(2+) solution also influences the uptake efficiency. Thermodynamic parameters for the uptake of Hg(2+) ions were calculated. For the temperature range studied, the Hg(2+) sorption increased with decreasing temperature.
authors.affiliation: CESAM, Department of Chemistry, University of Aveiro, 3810-193, Aveiro, Portugal.
authors.forename: Cláudia B
authors.initials: CB
authors.lastname: Lopes
authors.forename: Marta
authors.initials: M
authors.lastname: Otero
authors.forename: Zhi
authors.initials: Z
authors.lastname: Lin
authors.forename: Carlos Manuel
authors.initials: CM
authors.lastname: Silva
authors.forename: Eduarda
authors.initials: E
authors.lastname: Pereira
authors.forename: João
authors.initials: J
authors.lastname: Rocha
authors.forename: Armando C
authors.initials: AC
authors.lastname: Duarte
mesh_terms: D000327:Adsorption; D006863:Hydrogen-Ion Concentration; D007477:Ions; D007700:Kinetics; D008628:Mercury / Q000737:chemistry* / Q000302:isolation & purification; D017640:Silicates / Q000737:chemistry; D012996:Solutions / Q000737:chemistry; D013054:Spectrophotometry, Atomic / Q000379:methods; D013696:Temperature; D013816:Thermodynamics; D014025:Titanium / Q000737:chemistry; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification; D018508:Water Purification / Q000379:methods*
chemical_list: D007477:Ions; D017640:Silicates; D012996:Solutions; D014874:Water Pollutants, Chemical; D014867:Water; D014025:Titanium; D008628:Mercury