Immobilization of uranium during the deposition of carbonated hydroxyapatite
Immobilization of uranium during the deposition of carbonated hydroxyapatite
复制标题
碳酸羟基磷灰石沉积过程中铀的固定
DOI：
10.1016/j.jtice.2022.104331
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发表时间：
2022-05
影响因子：
5.7
通讯作者：
Xiaoli Tan
中科院分区：
文献类型：
--
作者：
Tianhao Han;Weiwei Chen;Yawen Cai;Zhimin Lv;Yifeng Zhang;Xiaoli Tan
背景由于铀污染的随机分布性质，修复策略往往集中在原位固定。石灰石通过与磷酸盐的自发置换反应限制铀的迁移，实现铀的固定化。通过添加Na 2CO 3研究了碳酸盐浓度对反应过程的影响。重要发现沉积过程伴随着共沉淀对铀的固定。0.52 mmol/L铀的固定化率（92.6%）是由于磷酸铀酰钙的形成，碳酸盐浓度的增加对铀的固定化有明显的抑制作用，50 Mm的碳酸盐可使铀的固定化率降低近20%。XRD、FTIR、拉曼、XPS、EA和荧光光谱分析表明，共沉淀、络合和包封是铀固定化的主要机理。通过测定A型和B型置换的比例，揭示了碳酸盐和磷酸盐的竞争使铀的固定作用减弱。研究结果表明，铀在地圈中的沉积应考虑到修复和放射性污染处置。
BackgroundDue to the randomly distributed nature of uranium contamination, remediation strategies often concentrate onin-situimmobilization. Limestone can limit the migration of uranium through its spontaneous replacement reaction with phosphate, and achieve uranium immobilization.MethodsIn this study, the immobilization of uranium in the deposition process of hydroxyapatite was investigated. The effect of carbonate concentration on the reaction process was studied by adding Na2CO3.Significant findingsThe deposition process is accompanied by the immobilization of uranium by co-precipitation. The immobilization (92.6%) of uranium (0.52 mmol/L) is due to the formation of calcium uranyl phosphate, increasing carbonate concentration has a significant inhibitory effect on uranium immobilization, and the 50 Mm carbonate can reduce the uranium immobilization efficiency by nearly 20%. XRD, FTIR, Raman, XPS, EA and fluorescence spectroscopy proved that co-precipitation, complexation, and encapsulation were the main mechanisms of uranium immobilization. Through determining the ratios of type-A and type-B substitutions, it reveals the immobilization of uranium weakens due to the competition of carbonate and phosphate. Our study provides the deposition of uranium in the geosphere should be taken into account for remediation and radioactive pollution disposal.
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