Abstract
On the basis of the mechanism of ions precipitation reaction equilibrium, the thermodynamic analysis of Men+(La3+, Ni2+, Fe3+, Al3+)-CO32--NH3•H2O system was discussed in this paper. The relation curves between total concentrations of each metal ion and pH values at different total ammonia concentrations cN and total carbon concentrations cC were obtained. The suitable pH value of the complete precipitation reaction for all metal ions was also determined. It shows that when cN = 0.010 mol•L-1 and cC = 1.000 mol•L-1, the optimal pH is 9.0 to prepare the doped titanium dioxide powders by coprecipitation-coating process and using NaHCO3 and NH3•H2O as the precipitants.
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