Abstract
AbstractA laboratory experiment has been made on the adsorption of the Cr3+ ion on freshly‐precipitated titanium dioxide, in order to determine the effect of the concentrations of the Cr3+ and H+ ions in solution on the amount of the adsorbed chromium. The adsorption isotherms have been determined at 5 pH's (3.25 to 4.25). The adsorption at each pH is well shown by the Langmuir isotherm; it could be generalized by expressing the two parameters of the equation in function of the H+ proton activity: the maximum adsorption capacity may be represented by a second‐degree polynomial (1/verbar;Hverbar;) and the adsorption constant by a power law.The general model proposed is the following: where X and C represent the adsorbed chromium concentration and the chromium concentration in solution, respectively.The aforesaid study has permitted to explain the coprecipitation of chromium (III) and titanium (IV) during the continuous neutralization of an industrial effluent containing both metals.
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