Abstract
Experimental testing of a previously proposed model for the adsorption of chromic ions onto freshly precipitated titanium hydroxide was carried out. The model represents by a Langmuir-type equation the relationship between the concentrations of adsorbed chromic ions and of chromium remaining in solution for a given proton activity. Two examples are given: batch neutralization of a dilute laboratory solution and continuous neutralization of an industrial spent acid. In spite of very different experimental conditions, the experimental results, given as the concentration of chromium in solution as a function of pH, are in very good agreement with the predictions given by the model. Temperature and ionic strength appear to have little influence on the adsorption of chromic ions onto the titanium hydroxide. The model should be useful for the study of practical industrial systems.
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