Instituto Nacional de Investigaciones Nucleares, Depto. de Química, Apdo. Postal 18-1027, México, D.F., Mexico.
J Hazard Mater. 2010 Aug 15;180(1-3):297-302. doi: 10.1016/j.jhazmat.2010.04.030. Epub 2010 Apr 14.
The effects of pH, contact time, fluoride-ion concentration, and the dose of sorbent on the sorption of fluoride ions by hydroxyapatite were studied. Equilibrium was reached in 16 h of contact time and the maximum sorption of fluoride ions was in the pH(eq) range between 5 and 7.3. The highest efficiency in the sorption system was determined by using 0.01 g of hydroxyapatite and 25 mL of solution. The pseudo-second order model described the kinetic sorption processes, and the Freundlich model, the sorption isotherm process. These results indicated that the mechanism was chemisorption on a heterogeneous material. Fluoride ions were partially desorbed using an alkaline solution.
研究了 pH 值、接触时间、氟离子浓度以及吸附剂用量对羟基磷灰石吸附氟离子的影响。接触 16 小时后达到平衡，氟离子的最大吸附量在 pH(eq) 5 到 7.3 之间。在吸附体系中，使用 0.01 克羟基磷灰石和 25 毫升溶液确定了最高效率。准二级动力学模型描述了吸附动力学过程，而 Freundlich 模型描述了吸附等温线过程。这些结果表明，该机制是在非均相材料上的化学吸附。使用碱性溶液部分解吸了氟离子。
