Barely Significant

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With the increase in the Cu dose, OH − was eventually depleted and CaCO 3 replace OH − to react with CuCl 2 , as expressed below: 2CuCl 2 + 2CaCO 3 + 2H 2 O → Cu 2 (OH) 3 Cl + 3Cl − + OH − + 2Ca 2+ + CO 2 (2) This was well reflected in the scenarios of high Cu doses, showing lower carbon content in the solid residue, relative to that in the original red mud and a clear trend that carbon content in the solid residue decreased with increasing Cu dose ( Figure 1 b).
Results showed that fluoride adsorption onto Al-Fe complex surface-modified granular ceramic was pH-dependent and the maximum removals of fluoride were obtained at pH in range between 5.0 and 8.0 while further increases of pH showed a negative trend.
A Review on Adsorption of Fluoride from Aqueous Solution.
Materials (Basel) · 2014 · PMC5456123
The sorption density of fluoride on the calcined product was the greatest for MgO-I and the smallest for MgO-II, although repeated calcinations did not show a clear trend in either the values of specific surface areas for the calcined products or the sorption efficiency of fluoride per unit mass and surface area.
A Review on Adsorption of Fluoride from Aqueous Solution.
Materials (Basel) · 2014 · PMC5456123
For the film resistance (R 3 ), it has a smaller value compared to R 2 but does not have a clear trend, due to its variation in magnitude with time for the formation and desorption of the film-electrolyte interface; generally speaking, R 3 decreases with the addition of lactic acid, suggesting that the resistance of the film formed on the titanium surface to lactic acid is rather lower.