超微羟基磷灰石(HAP)纳米粒子对水溶液中氟离子的吸附研究

Studies on adsorptions of fluoride ions by the hydroxyapatite nanoparticles

如何有效地去除水中过量的F-一直是学术界和工业界关注的热点问题,因为过量F-对人体及动物体危害很大.论文以平均粒径约为10 nm的超微羟基磷灰石(HAP)纳米粒子(由氯化钙溶液和(NH4)2HPO4溶液在葡萄糖分子限域作用下反应得到)为吸附剂,对废水中的F-吸附行为进行了深入研究.研究发现,超微HAP纳米粒子吸附剂对F-具有优异的吸附性能,在室温(25℃)、中性水溶液中对F-的最大吸附容量约为86.43 mg/g,是平均颗粒粒径100 nm HAP的两倍多(100 nm HAP对F-最大吸附容量约为34.01 mg/g).86.43 mg/g在目前报道的所有F-吸附量中位列第二.此吸附剂以其简便合成方法、环境友好特征以及超大的吸附容量,在水溶液中F-的去除方面具有很好的应用前景.

How to remove excessive F-ions from water effectively is always a hot issue in academia and industry because it is very harmful to human body.In this paper,hydroxyapatite(HAP)nanoparticles with an average particle size about 10 nm,synthesized by the reaction between CaCl2 and(NH4)2HPO4 solutions under the existence of glucose as restricted domain reagent,were used as adsorbent to adsorb F-from waste water,and excellent adsorption capacity to F-of the adsorbent was possibly from its super strong surface polarity.Maximum adsorption capacity of the nanoparticles to F-in neutral aqueous solution is about 86.43 mg/g at 25℃,more than twice of HAP with average diameter about 100 nm(34.01 mg/g).86.43 mg/g ranks the second adsorption capacity among all data reported.The adsorbent has a good application prospect in the removal of F-in aqueous solution due to its simple synthesis method,environmentally friendly characteristics and super large adsorption capacity.