Uranium extraction using hydroxyapatite recovered from phosphorus containing wastewater
Uranium extraction using hydroxyapatite recovered from phosphorus containing wastewater
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DOI：
10.1016/j.jhazmat.2019.120784
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发表时间：
2020-01-15
影响因子：
13.6
通讯作者：
Shih, Kaimin
中科院分区：
文献类型：
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作者：
Kong, Lingjun;Ruan, Yang;Shih, Kaimin
大量的含铀（U（VI））工业废水产生于铀矿开采和加工以及核能发电。含U（VI）废水的排放会对环境造成严重的破坏，并导致资源的损失。铀在羟基磷灰石（HAP）上的吸附已经被广泛研究以解决上述问题。在本研究中，BC-HAP回收通过磷酸盐吸附从废水中，这是第一次重复使用作为一个潜在的吸附剂从水溶液中提取铀相比，市售的纳米HAP。通过批量实验、傅立叶变换红外光谱、扫描电镜和X射线衍射分析，研究了铀在回收BC-HAP上的吸附行为及其转化规律。BC-HAP对铀有上级吸附能力。铀吸附后，出现了纳米级的铀云母沉淀。在Na 2CO 3和NaHCO 3存在下观察到铀的部分解吸。表面络合作用和磷酸盐溶解沉淀作用对铀的吸附有利。因此，回收的BC-HAP可以作为一种有前途的和经济有效的吸附剂从水溶液中提取铀。
A considerable amount of uranium (U(VI))-containing industrial wastewater is generated from both uranium mining and processing, and nuclear electrical power generation. Discharge of U(VI) containing wastewater causes severe damage to the environment and leads to a loss of resources. Uranium sorption on hydroxyapatite (HAP) has been studied extensively to address the abovementioned issues. In the present study, BC-HAP was recovered through phosphate sorption from wastewater, which was first reused as a potential sorbent for extracting uranium from aqueous solutions comparing to commercially available nano-HAP. The sorption behavior of uranium and its transformation on the recovered BC-HAP were investigated by conducting batch experiments as well as Fourier-transform infrared, scanning electron microscopy, and x-ray diffraction analyses. BC-HAP had superior sorption ability for uranium extraction. Autunite precipitant at nano-scale is observed after uranium sorption. Partial desorption of uranium was observed in the presence of Na2CO3 and NaHCO3. Surface complexation and phosphate dissolution precipitation contributed to the favorable uranium sorption. Thus, recovered BC-HAP can be widely used as a promising and cost-effective adsorbent to extract uranium from aqueous solution.