THE THERMODYNAMICS OF AQUEOUS ELECTROLYTE MIXTURES AT ELEVATED TEMPERATURES. THE SOLUBILITY OF SILVER SULFATE IN KNO3—K2SO4, K2SO4—MgSO4, AND K2SO4—H2SO4MIXTURES

1962 ◽  
Vol 66 (11) ◽  
pp. 2264-2266 ◽  
Author(s):  
M. H. Lietzke ◽  
R. W. Stoughton
Keyword(s):  
Elevated Temperatures ◽  
Aqueous Electrolyte ◽  
Electrolyte Mixtures ◽  
Silver Sulfate

scholarly journals Photocatalytic Decolorization of Methyl Red on Nanoporous Anodic ZrO2 of Different Crystal Structures

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 215
Author(s):  
Ewa Wierzbicka ◽  
Karolina Syrek ◽  
Klaudia Mączka ◽  
Grzegorz D. Sulka
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Performance ◽  
Elevated Temperatures ◽  
Aqueous Electrolyte ◽  
High Surface ◽  
High Surface Area ◽  
Methyl Red ◽  
Self Organized ◽  
Photocatalytic Decolorization ◽  
Perfect Adhesion

High surface area, self-organized nanoporous ZrO2 arrays with perfect adhesion to the Zr substrate were synthesized by anodization in an aqueous electrolyte containing (NH4)2SO4 and NH4F. The obtained semiconductor materials were tested as photocatalysts for decolorization of the methyl red (MR) as a model azo dye pollutant. It was demonstrated that as-synthesized anodic ZrO2 anodic layers are already crystalline and, therefore, do not require further thermal treatment to provide a high photocatalytic performance. However, photocatalytic efficiency could be improved by annealing at a relatively low-temperature of 350 °C. Higher annealing temperatures caused a gradual drop of photocatalytic activity. The photocatalytic behavior was correlated with the crystal phase transformation in anodic ZrO2. It was found that higher photocatalytic activity was observed for the tetragonal phase over the monoclinic phase (predominant at elevated temperatures). It results from the optimal and complex electronic structure of annealed ZrO2 with three different energy states having absorption edges at 2.0, 4.01 and 5.28 eV.

Experimental Determination of Densities of Aqueous Electrolyte Mixtures Containing B(OH)3or Na2B4O7and Their Correlation with the Pitzer Model

2006 ◽  
Vol 45 (19) ◽  
pp. 6604-6613 ◽  
Author(s):  
Héctor R. Galleguillos ◽  
Mirsa A. Molina ◽  
Teófilo A. Graber ◽  
María E. Taboada ◽  
Felipe Hernández-Luis
Keyword(s):  
Experimental Determination ◽  
Aqueous Electrolyte ◽  
Pitzer Model ◽  
Electrolyte Mixtures
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