Abstract
Ammonia is strongly absorbed on tantalum hydroxide prepared by ammonia neutralization of TaF7 2− or TaF6 − complexes. FTIR analysis of tantalum hydroxide shows a characteristic peak around 1,400 cm−1, attributed to NH4 +. TG and FTIR analyses show that the NH4 + decomposes at about 500 °C. The correct chemical formula of tantalum hydroxide prepared by ammonia neutralization of TaF7 2− or TaF6 − is thus TaO x (OH)5-x (NH4) x . This conclusion is also confirmed by TG and FTIR analysis of tantalum hydroxide treated with various concentrations of inorganic acid at room temperature. The NH4 + in tantalum hydroxide can be exchanged completely in aqueous HNO3 solution, and the weight loss of the resulting sample is ended at about 415 °C by TG analysis. The NH4 + can also be exchanged completely with aqueous H2SO4 solution; however, SO4 2− is weakly absorbed on the tantalum hydroxide. Finally, the NH4 + can be exchanged partially with aqueous H3PO4 solution; however, PO4 3− is strongly absorbed on the tantalum hydroxide.
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