Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China.
Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China.
J Hazard Mater. 2019 Jun 5;371:397-405. doi: 10.1016/j.jhazmat.2019.02.110. Epub 2019 Mar 1.
Rapidly increasing development of nuclear power stimulates the exploration of low-cost and highly efficient materials to selectively remove uranium (VI) from contaminated wastewater streams. Herein, we successfully developed a novel hydroxyapatite (HAP) adsorbent by using a facile and template-free hydrothermal method. The XRD results demonstrated that the HAP was crystallized in hexagonal structure (space group P63/m(176)), and the images of SEM and TEM indicated that the HAP possessed hollow and hierarchical nanostructure. A large BET specific surface area (182.6 m/g) and average pore size of 10.5 nm, suggested that the hierarchical hollow HAP microspheres could provide sufficient active sites for highly efficient removal of uranium from aqueous solutions, indicated the HAP might be a prompt emergency material for the remediation of nuclear leakage accident. Freundlich isotherm and pseudo-second-order kinetics model fitted well to sorption experimental data. The study was further advanced by FT-IR and XPS. The sorption mechanism was mainly attributed to surface chemisorption between U(VI) and HAP, forming a new U-containing compound, viz., autunite (Ca(UO)(PO)·3HO).
核能的快速发展刺激了人们对低成本、高效率材料的探索，以选择性地从受污染的废水中去除六价铀。在此，我们成功地使用简便、无模板的水热法开发了一种新型羟基磷灰石（HAP）吸附剂。XRD 结果表明，HAP 结晶为六方结构（空间群 P63/m(176)），SEM 和 TEM 图像表明 HAP 具有中空和分级纳米结构。大的 BET 比表面积（182.6 m/g）和平均孔径为 10.5 nm，表明分级中空 HAP 微球可为从水溶液中高效去除铀提供充足的活性位点，表明 HAP 可能是核泄漏事故修复的一种紧急材料。Freundlich 等温线和拟二级动力学模型很好地拟合了吸附实验数据。进一步通过 FT-IR 和 XPS 进行了研究。吸附机制主要归因于 U(VI)和 HAP 之间的表面化学吸附，形成一种新的含 U 化合物，即钙铀磷石（Ca(UO)(PO)·3HO）。
