Health physics Division, Bhabha Atomic Research Centre, Mumbai, India.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2020;55(5):596-605. doi: 10.1080/10934529.2020.1721228. Epub 2020 Jan 31.
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) 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.
采用原位化学沉淀法合成了羟基磷灰石包覆活性炭纳米复合材料。不同的特性分析证实，羟基磷灰石成功地包覆在了活性炭粉末上。对纳米复合材料进行了广泛的 U(VI)吸附研究，以了解接触时间、腐殖酸、碳酸盐、离子强度和 pH 值的影响。研究表明，与前体相比，该复合材料是一种更有效的 U(VI)吸附剂，它可以去除 U(VI)离子，而不会改变水的物理化学性质。吸附在非均相表面上表现为多层吸附，并遵循化学吸附。通过将 U(VI)离子以三个不同的初始浓度（50、100 和 150μg/L）加入自来水并让自来水通过装满复合材料的筒进行实际应用研究。结果表明，洗脱水中 U(VI)离子的浓度分别降低到 98.28%、96.20%和 97.40%。这表明该材料具有去除溶解态 U(VI)离子的巨大潜力，可作为复杂天然水系统中溶解态 U(VI)的替代过滤材料。
