Multielemental Elution Behavior of Metal Ions Adsorbed on Iminodiacetic Acid Chelating Resin by Using Hydrogen Peroxide as an Eluent
Multielemental Elution Behavior of Metal Ions Adsorbed on Iminodiacetic Acid Chelating Resin by Using Hydrogen Peroxide as an Eluent
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DOI：
10.2116/analsci.28.463
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发表时间：
2012-05
影响因子：
1.6
通讯作者：
T. Yabutani;Hidehiko Sumi;Takamasa Nakamura;Shinsuke Akatsuki;L. Thuy
中科院分区：
文献类型：
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作者：
T. Yabutani;Hidehiko Sumi;Takamasa Nakamura;Shinsuke Akatsuki;L. Thuy
以过氧化氢(H_2O_2)为洗脱剂，研究了亚氨基二乙酸(IDA)螯合树脂对吸附金属离子的多元洗脱行为。结果表明，H_2O_2能有效地洗脱V(V)、Mo(VI)、W(VI)、Nb(V)和Ta(V)。X-射线光电子能谱分析表明，V(V)、Mo(VI)和W(VI)在H_2O_2洗脱过程中的氧化状态没有改变。此外，V(V)、Mo(VI)和W(VI)在H_2O_2洗脱液中的UV-Vis吸收光谱和红外光谱表明，金属-过氧络合物是通过H_2O_2洗脱形成的。这些金属离子从IDA官能团上脱附的原因是不稳定以及过氧基与V(V)、Mo(VI)和W(VI)-IDA络合物的配位，以及在中性pH条件下，IDA解离的羧基与含氧阴离子之间的静电斥力降低了吸附容量。将该方法用于从飞灰酸溶部分中选择性地分离V(V)、Mo(VI)和W(VI)时，V(V)的含量为83.4±2.5%。在30wt%H_2O_2洗脱液中，Mo(VI)的回收率为88.1±3.3%，W(VI)的回收率为69.3±5.4%。
In the present work, we investigated the multielemental elution behavior of metal ions absorbed on iminodiacetic acid (IDA) chelating resin by using hydrogen peroxide (H_2O_2) as an eluent. As a result, V(V), Mo(VI), W(VI), Nb(V) and Ta(V) were efficiently eluted by H_2O_2. In contrast, other metal ions were rarely recovered. The oxidation states of V(V), Mo(VI), and W(VI) were not changed through the H_2O_2 eluting process, checked by X-ray photoelectron analysis. In addition, the UV-vis adsorption spectra and IR spectra of V(V), Mo(VI) and W(VI) in the H_2O_2 eluent suggested the formation of metal-peroxo complexes through H_2O_2 elution. The desorption of these metal ions from IDA functional groups is explained in term of destabilization along with the coordination of peroxo-ligands to the V(V)-, Mo(VI)- and W(VI)-IDA complexes, and a decrease in the adsorption capacity by electrostatic repulsion between dissociated carboxylic groups of IDA and the oxoanions in the neutral pH shown in 30 wt% H_2O_2. When this method was applied to the selective separation of V(V), Mo(VI) and W(VI) from other metals in an acid soluble fraction of fly-ash, 83.4 ± 2.5% of V(V), 88.1 ± 3.3% of Mo(VI), and 69.3 ± 5.4% of W(VI) were recovered in a 30 wt% H_2O_2 eluent.