Su Ruojiao, Wang Miaomiao, Jiang Yuwei, Zhang Shuang, Tan Junjun
Hubei Provincial Key Laboratory of Green Materials for Light Industry, Hubei University of Technology, Wuhan 430068, China.
Collaborative Innovation Center of Green Light Weight Materials and Processing, Hubei University of Technology, Wuhan 430068, China.
Nanomaterials (Basel). 2025 Apr 18;15(8):621. doi: 10.3390/nano15080621.
Amorphous calcium phosphate (ACP), one of the most important calcium-phosphorus compounds, is widely used in dentistry, orthopedics, and medicine, but is rarely reported for fluoride removal from water. In view of this, sodium citrate-stabilized amorphous calcium phosphate (Cit-ACP) and Cit-ACP calcinated at different temperatures were successfully prepared for fluoride removal. The results showed that the adsorption data of the Cit-ACP sample could be well described by the Langmuir model, and the adsorption kinetic followed the pseudo-second-order model. The maximum adsorption capacity was 27.48 mg/g at pH 7.0 when the fluoride concentration is 100 mg/L. The thermodynamic parameters suggested that the adsorption of fluoride was a spontaneous endothermic process. The XRD, XPS, and Zeta potential analysis of the Cit-ACP sample before and after fluoride removal revealed that, owing to the core-shell structure of the Cit-ACP nanoparticles, the fluoride ions in solution and the calcium ions in shell layer of the Cit-ACP nanoparticles co-promoted the transformation of the core of the Cit-ACP nanoparticles into fluorapatite. Given the simplicity of its preparation and effectiveness of its fluoride removal properties, Cit-ACP would be a potentially economical, efficient, and biocompatible adsorbent for fluoride removal.
无定形磷酸钙（ACP）是最重要的钙磷化合物之一，广泛应用于牙科、骨科和医学领域，但很少有关于其用于去除水中氟化物的报道。鉴于此，成功制备了柠檬酸钠稳定的无定形磷酸钙（Cit-ACP）以及在不同温度下煅烧的Cit-ACP用于氟化物去除。结果表明，Cit-ACP样品的吸附数据能用Langmuir模型很好地描述，吸附动力学遵循准二级模型。当氟化物浓度为100 mg/L时，在pH 7.0条件下最大吸附容量为27.48 mg/g。热力学参数表明氟化物的吸附是一个自发的吸热过程。对氟化物去除前后的Cit-ACP样品进行XRD、XPS和Zeta电位分析表明，由于Cit-ACP纳米颗粒的核壳结构，溶液中的氟离子与Cit-ACP纳米颗粒壳层中的钙离子共同促进了Cit-ACP纳米颗粒核心向氟磷灰石的转变。鉴于其制备简单且氟化物去除性能有效，Cit-ACP将是一种潜在经济、高效且具有生物相容性的氟化物去除吸附剂。
