Uranium (U) contamination has been widely found in groundwater and greatly threatens human health. The present study investigated U removal from aqueous solution using a permeable reactive barrier (PRB) with hydroxyapatite as a reactive material under appropriate conditions. Different-size hydroxyapatites were loaded to quartz sand and the mineral composition of the composite materials was identified by XRD before being applied to column experiments and after adsorption U. Results showed that U removal processes were influenced by sorbent particle size, initial U concentration and hydraulic loading, and initial U concentration exerted the greatest effect on U removal efficiency. Uranium sorption data were fitted to Thomas and Yoon-Nelson models. The fitting results indicated that Thomas model was better than Yoon-Nelson model for description of U sorption characteristics in this study, which had higher correlation coefficients (>0.97). Adsorbed U formed plate-like crystals and occurred widely on the surface of hydroxyapatite, as visualized by SEM. Determination of XPS and EDS in samples with high U concentration implied that U adsorption was achieved via either dissolution-precipitation reactions involving low-solubility U-bearing minerals or surface complexation with reactive function groups on the surface of hydroxyapatite, which was supported by U speciation calculated at equilibrium atmospheric CO₂ and U solid phases. The findings suggest that the hydroxyapatite-based PRB can serve as an effective treatment technique for remediation of U contaminated groundwater.

铀（U）污染已在地下水中广泛发现，严重威胁着人类健康。本研究研究了在适当条件下使用可渗透的反应性屏障（PRB）和羟基磷灰石作为反应性物质从水溶液中去除铀的方法。将不同尺寸的羟基磷灰石加载到石英砂上，然后通过XRD鉴定复合材料的矿物成分，然后再用于柱实验和吸附U。结果表明，U的去除过程受吸附剂粒径，初始U浓度和水力的影响。负荷和初始U浓度对U去除效率的影响最大。铀的吸附数据适用于Thomas和Yoon-Nelson模型。拟合结果表明，在描述U吸附特性方面，Thomas模型优于Yoon-Nelson模型，其相关系数更高（> 0.97）。通过SEM观察，吸附的U形成板状晶体并广泛存在于羟基磷灰石表面上。测定高U浓度样品中的XPS和EDS意味着，U吸附是通过包含低溶解度U的矿物的溶解沉淀反应或通过羟基磷灰石表面上具有反应性官能团的表面络合（通过U形态形成）而实现的。在平衡大气CO下计算 通过SEM可视化。测定高U浓度样品中的XPS和EDS意味着，U吸附是通过包含低溶解度U的矿物的溶解沉淀反应或通过羟基磷灰石表面上具有反应性官能团的表面络合（通过U形态形成）而实现的。在平衡大气CO下计算 通过SEM可视化。测定高U浓度样品中的XPS和EDS意味着，U吸附是通过包含低溶解度U的矿物的溶解沉淀反应或通过羟基磷灰石表面上具有反应性官能团的表面络合（通过U形态形成）而实现的。在平衡大气CO下计算₂和U固相。研究结果表明，基于羟基磷灰石的PRB可以作为修复U污染地下水的有效处理技术。