Synthesis of hydroxyapatite coated activated carbon nanocomposite was carried out by in-situ chemical precipitation method. Different characterizations confirm that, hydroxyapatite successfully coated over activated carbon powder. Extensive sorption studies of U(VI) on the nanocomposite were conducted to know the effect of contact time, humic acid, carbonate, ionic strength and pH. The study revealed that, the composite material is a more efficient sorbent for U(VI) compared to precursors, which removes U(VI) ion without altering physicochemical properties of water. Sorption exhibits multilayer adsorption on heterogeneous surface and follows chemisorptions. Practical applicability of the material was demonsteted by spiking tap water with U(VI) ion at three different initial concentrations (50, 100 and 150 µg L-1) and the tap water was allowed to passed through a cartridge packed with composite. It was observed that, the concentration of U(VI) ion in eluted water reduced to 98.28%, 96.20% and 97.40%, respectively. This revealed that, the material possesses a huge potential for sequestrating dissolved U(VI) ion and can be used as alternate filtering material for dissolved U(VI) in complex natural water system.

中文翻译：

---

使用羟基磷灰石涂层活性炭粉末纳米复合材料从水中去除铀（VI）。

采用原位化学沉淀法合成了羟基磷灰石包覆的活性炭纳米复合材料。不同的特征证实，羟基磷灰石成功地涂覆在活性炭粉末上。进行了U（VI）在纳米复合材料上的广泛吸附研究，以了解接触时间，腐殖酸，碳酸盐，离子强度和pH的影响。研究表明，与前驱体相比，该复合材料对U（VI）的吸附效率更高，可去除U（VI）离子而不会改变水的理化性质。吸附表现出在异质表面上的多层吸附，并遵循化学吸附。通过在三种不同的初始浓度下用U（VI）离子向自来水添加水来证明该材料的实际适用性（50，100和150 µg L-1）和自来水通过装有复合材料的滤筒。观察到，洗脱水中的U（VI）离子浓度分别降低到98.28％，96.20％和97.40％。这表明，该材料具有螯合溶解的U（VI）离子的巨大潜力，可以用作复杂天然水系统中溶解的U（VI）的替代过滤材料。