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一、前言 用钨(钼)酸盐溶液与硝酸镧溶液混合制得钨(钼)酸锎[La_2(WO_4)_3·3H_2O,La_2(MoO_4)_3·H_2O]。对合成物作了X射线分析,并研究了产物的化学性质。测得钨酸镧的溶度积Ksp=3.4×10~(-25),它的溶解度比钼酸镧小,这与文献[1、2]不同。实验结果表明,钨酸镧具有良好的离子交换性能,对Fe~(3+)和Pb~(2+)有强的亲合力。在所研究的离子中,交换能力的顺序是Fe~(3+)>Pb~(2+)>Zn~(2+)>Cu~(2+>Co~(2+)～Ni~(2+)。
I. INTRODUCTION Tungsten molybdenum tartrate [La_2 (WO_4) _3 · 3H_2O, La_2 (MoO_4) _3 · H_2O] is prepared by mixing tungsten (molybdenum) acid solution with lanthanum nitrate solution. The composition was analyzed by X-ray and the chemical properties of the product were studied. The measured solubility product of lanthanum tungstate, Ksp = 3.4 × 10 ~ (-25), is less soluble than lanthanum molybdate, which is different from the literature [1,2]. The experimental results show that lanthanum tungstate has good ion exchange performance and strong affinity for Fe ~ (3+) and Pb ~ (2+). Among the studied ions, the order of exchange ability is Fe ~ (3 +)> Pb ~ (2 +)> Zn ~ (2 +)> Cu ~ (2+> Co ~ 2+ ~ Ni ~ +).