缺钙羟基磷灰石作为锶的潜在吸附剂。
Calcium-deficient Hydroxyapatite as a Potential Sorbent for Strontium.
机构信息
Materials Sciences Research Center, Japan Atomic Energy Agency, 2-4 Shirakata-Shirane, Naka-gun, Tokai, Irabaki, 319-1195, Japan.
Advanced Science Research Center, Japan Atomic Energy Agency, 2-4 Shirakata-Shirane, Naka-gun, Tokai, Ibaraki, 319-1195, Japan.
出版信息
Sci Rep. 2017 May 18;7(1):2064. doi: 10.1038/s41598-017-02269-z.
A calcium (Ca)-deficient hydroxyapatite was investigated for its potential to remove Sr from environmentally relevant water. We conducted sorption tests on solutions containing magnesium ion (Mg) and calcium ion (Ca) as competing cations at a strontium ion (Sr) concentration of 0.05 mmol/L. The Ca-deficient hydroxyapatite maintained a high Sr sorption ratio of above 80% in the presence of Mg and Ca at the concentrations between 0.1 and 1.0 mmol/L, whereas the stoichiometric hydroxyapatite showed a lower ratio even in the presence of small amounts of Mg and Ca (72% for Mg and 51% for Ca at 0.1 mmol/L). For solutions with various Sr concentrations between 0.01 and 10 mmol/L, Ca-deficient hydroxyapatite exhibited a higher Sr sorption ratio than stoichiometric hydroxyapatite. The bonding states of Sr on the Ca-deficient hydroxyapatite were evaluated by extended X-ray absorption fine structure measurements. The results indicated that there are specific sorption sites in Ca-deficient hydroxyapatite where Sr is stably and preferentially immobilized.
研究了一种缺钙羟基磷灰石去除环境相关水中锶的潜力。我们在含有镁离子（Mg）和钙离子（Ca）作为竞争阳离子的溶液中进行了吸附试验，锶离子（Sr）浓度为 0.05 mmol/L。在 0.1 至 1.0 mmol/L 的浓度下，缺钙羟基磷灰石在存在镁和钙的情况下保持了 80%以上的高锶吸附率，而化学计量羟基磷灰石即使在存在少量镁和钙的情况下也表现出较低的比率（0.1 mmol/L 时镁为 72%，钙为 51%）。对于 0.01 至 10 mmol/L 之间各种 Sr 浓度的溶液，缺钙羟基磷灰石表现出比化学计量羟基磷灰石更高的 Sr 吸附率。通过扩展 X 射线吸收精细结构测量评估了 Sr 在缺钙羟基磷灰石上的键合状态。结果表明，在缺钙羟基磷灰石中存在特定的吸附位，Sr 在此处稳定且优先固定。
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