Calcium-deficient Hydroxyapatite as a Potential Sorbent for Strontium.
Calcium-deficient Hydroxyapatite as a Potential Sorbent for Strontium.
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DOI：
10.1038/s41598-017-02269-z
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发表时间：
2017-05-18
影响因子：
4.6
通讯作者：
Akiyoshi K
中科院分区：
文献类型：
--
作者：
Sekine Y;Motokawa R;Kozai N;Ohnuki T;Matsumura D;Tsuji T;Kawasaki R;Akiyoshi K
研究了缺钙羟基磷灰石对环境水体中Sr 2+的去除能力。在锶离子（Sr 2+）浓度为0.05 mmol/L的条件下，以镁离子（Mg 2+）和钙离子（Ca 2+）为竞争阳离子，进行了吸附试验。当Mg 2+和Ca 2+浓度在0.1 ~ 1.0 mmol/L时，缺钙羟基磷灰石对Sr 2+的吸附率可达80%以上，而化学计量羟基磷灰石对Mg 2+和Ca 2+的吸附率较低（当Mg 2+和Ca 2+浓度为0.1 mmol/L时分别为72%和51%）。对于Sr 2+浓度在0.01 ~ 10 mmol/L之间的溶液，缺钙羟基磷灰石比化学计量羟基磷灰石表现出更高的Sr 2+吸附率。利用扩展X射线吸收精细结构测量方法研究了Sr ~（2+）在缺钙羟基磷灰石表面的成键状态。结果表明，在钙缺乏的羟基磷灰石中存在特定的吸附位点，其中Sr 2+是稳定和优先固定。
A calcium (Ca)-deficient hydroxyapatite was investigated for its potential to remove Sr2+ from environmentally relevant water. We conducted sorption tests on solutions containing magnesium ion (Mg2+) and calcium ion (Ca2+) as competing cations at a strontium ion (Sr2+) concentration of 0.05 mmol/L. The Ca-deficient hydroxyapatite maintained a high Sr2+ sorption ratio of above 80% in the presence of Mg2+ and Ca2+ 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 Mg2+ and Ca2+ (72% for Mg2+ and 51% for Ca2+ at 0.1 mmol/L). For solutions with various Sr2+ concentrations between 0.01 and 10 mmol/L, Ca-deficient hydroxyapatite exhibited a higher Sr2+ sorption ratio than stoichiometric hydroxyapatite. The bonding states of Sr2+ 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 Sr2+ is stably and preferentially immobilized.