中文摘要：

我国高氟地下水分布广泛，经济、高效的饮用水除氟技术受到广泛关注。而海底铁锰结核具有很大的比表面积和很好的吸附性能，可作为潜在的除氟材料。本文利用不同剂量的改性剂三氯化铁溶液对铁锰结核进行改性。结果表明，当改性剂剂量大于0．5mmol／g后，吸附剂的除氟效率达到最大且较稳定，约为91％，因此，确定改性剂的最佳剂量为05mmol／g。研究了吸附反应时间、氟离子初始浓度、pH值对改性吸附剂除氟性能的影响，并探讨了改性材料的除氟机理，结果表明，改性吸附剂对氟离子的吸附符合Lagergren二级吸附动力学方程：Langmuir吸附等温模型可以很好地描述氟离子的吸附特性，溶液中氟离子足通过单层模式吸附到改性材料表面的。改性材料在pH值3．5～6时具有较好的吸附稳定性。三氯化铁改性的铁锰结核是一种较为理想的除氟材料。

英文摘要：

The present article bears in itself the investigation of the authors on the ways of treating high-fluoride containing groundwater by using natural manganese-iron nodules. As is known, hlgh-fluoride containing groundwater has been found popular in a lot of places in China and is widely used for drinking water. If such water is used as drinking water for years, the drinkers would likely suffer from overfluorosis. And fortunately, there exist abundant manganese-iron nodules at the bottom of the ocean, which are endowed with remarkable adsorption properties due to their high porosity and specific surface area. And it is for this reason that manganese-iron nodules are potentiaUy nice removal of fluoride from the high fluorosis containing groundwater. On the other hand, since the pristine has a relatively low adsorption capacity for F^- , it must be modified prior to the practical application in removing F^- from the water solution. Therefore, when modified by 0.5 mol/L FeCl3, the adsorbent tends to be highly efficient for F^- removal up to 91% . In addition, fluoride adsorption on the modified material can be made enhanced with the prolonging of contact hours. Thus, the results of adsorption kinetics would reveal that the adsorption rate of F^- agrees with the expression of Lagelgren second-order rate. Furthermore, the higher the initial F^- concentrate, the greater the absorption capacity. To be exact, the adsorption isotherm can be described as a Langmuir model, indicating the adsorption of F^- may occur on the surface of the adsorbent in a monolayer manner. In addition, fluoride adsorption proves relatively indeperdent on pH between 3.5 and 6, which is of great advantage in practical application. Therefore, the modified absorbent proves to be powerful in absorbing F^- with its maximum adsorption capacity being 0.861 mg/g.