Trinuclear terbium complex as well as preparation method and application thereof

The invention belongs to the technical field of development of rare earth solution treatment materials, and discloses a trinuclear terbium complex as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, preparing a ligand N, N ', N' ', N '''-tetra (2-hydroxy-3-methoxy-5-toluene)-1, 4, 7, 10-tetraazacyclododecane, H4L for short; then synthesizing a trinuclear terbium complex [Tb3 (HL) 2 (H2O) 2] Cl3 by using a ligand H4L and terbium trichloride, and recording as Tb3; and further treating the calcium terbium waste liquid by using Tb3 to obtain high-purity terbium trichloride. The Tb3 crystal material is used for carrying out adsorption treatment on the calcium-terbium waste liquid under the room temperature condition, calcium ions in the calcium-terbium mixed liquid can be remarkably removed, terbium ions are released, and the purity of treated terbium reaches 99.99% or above. 本发明属于稀土溶液处理材料的开发技术领域，公开了一种三核铽配合物及其制备方法和应用。本发明首先制备了配体N,N',N",N"'-四(2-羟基-3