Eu 3+ Sequestration by Biogenic Nano-Hydroxyapatite Synthesized at Neutral and Alkaline pH
Eu 3+ Sequestration by Biogenic Nano-Hydroxyapatite Synthesized at Neutral and Alkaline pH
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中性碱性pH下合成的生物纳米羟基磷灰石封存Eu 3
DOI：
10.1080/01490451.2016.1261966
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发表时间：
2017
影响因子：
2.3
通讯作者：
Gangappa R
中科院分区：
文献类型：
--
作者：
Gangappa R
生物羟基磷灰石（bio-HA）具有捕获放射性核素和修复金属污染环境的潜力。生物HA的生物合成通过补充有各种浓度的CaCl 2和2-磷酸甘油（G2 P）（pH 7.0或8.6）的沙雷氏菌属的磷酸酶活性来实现。通过X射线粉末衍射分析证实了样品中羟基磷灰石（HA）的存在。当在pH8.6条件下，加入1 mM的G2 P和5 mM的Ca ~（2+）时，发现了单水方解石，而生物HA和1 mM的Ca ~（2+）则分别积累了Eu（III）的31%和20%，而商品HA积累了50%的Eu（III）。最佳地，在初始pH 7.0下由2 mM Ca 2+和5 mM G2 P制备的生物-HA中，Eu（III）累积至生物-HA重量的约74%，其等于生物材料的HA矿物组分的质量。相对于潜在的生物HA屏障发展原位或作为一种补救策略的影响进行了讨论。
Biogenic hydroxyapatite (bio-HA) has the potential for radionuclide capture and remediation of metal-contaminated environments. Biosynthesis of bio-HA was achieved via the phosphatase activity of aSerratia sp. supplemented with various concentrations of CaCl2and glycerol 2-phosphate (G2P) provided at pH 7.0 or 8.6. Presence of hydroxyapatite (HA) was confirmed in the samples by X-ray powder diffraction analysis. When provided with limiting (1 mM) G2P and excess (5 mM) Ca2+at pH 8.6, monohydrocalcite was found. This, and bio-HA with less (1 mM) Ca2+accumulated Eu(III) to ∼31% and 20% of the biomineral mass, respectively, as compared to 50% of the mineral mass accumulated by commercial HA. Optimally, with bio-HA made at initial pH 7.0 from 2 mM Ca2+and 5 mM G2P, Eu(III) accumulated to ∼74% of the weight of bio-HA, which was equal to the mass of the HA mineral component of the biomaterial. The implications with respect to potential bio-HA-barrier development in situ or as a remediation strategy are discussed.