纳米磁性铁铝复合物的制备及其除氟性能  

Preparation and application in fluoride removal of iron-aluminum composite magnetic nanoparticles

作　　者：赵娜[1,2,3] 王云燕[1,2] 杨卫春[1,2] 尤翔宇[1,2] 柴立元[1,2] 

机构地区：[1]中南大学冶金与环境学院,湖南长沙410083 [2]中南大学国家重金属污染防治工程技术研究中心,湖南长沙410083 [3]长沙有色冶金设计研究院,湖南长沙410011

出　　处：《中南大学学报（自然科学版）》2014年第1期334-340,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51304252);国家"十二五"科技支撑计划项目(2012BAC12B04);湖南有色金属研究基金资助项目(2011年);国家公益性(环保)行业科研项目(2011467062)

摘　　要：采用碱性共沉淀的方法制备载体纳米Fe3O4,并选用硫酸铝对其进行包覆改性制备除氟吸附剂,优化制备条件,考察制备得出的吸附剂对氟化物的去除效果,并采用透射电镜（TEM）、能谱（EDS）、X线衍射（XRD）、振动样品磁强计（VSM）等对吸附剂的性质进行表征。研究结果表明：吸附剂最优制备条件参数为Fe3O4与Al投加量摩尔比1：2,制备反应pH=5.0。最优条件下制备的除氟吸附剂即纳米磁性铁铝复合物,其比表面积为63.37 m2/g,平均粒径为15-20 nm,饱和磁化强度为15.63 A·m2/kg,零电荷点pHpzc为11.2。该吸附剂适用pH范围广,在pH为4.0-10.0范围内除氟率均在84%以上,在pH为7.0时的氟化物吸附等温线符合Langmuir等温模型,吸附容量可达48 mg/g。The adsorbents for fluoride removal were prepared by coating magnetite nanoparticles with aluminum sulphate The properties of the adsorbents were analyzed by transmission electron microscope （TEM）, energy disperse spectroscopy （EDS）, X-ray diffraction （XRD）, vibrating sample magnetometer （VSM）. The results show that the optimum preparation condition is as follows： molar ratio of Fe3O4 to Al being 1：2, and preparation pH being 5.0. The properties of the adsorbent prepared under the optimum condition are as follows： BET surface area being 63.37 m2/g, average particle size being 15-20 nm, pHpzc being 11.2 and saturation magnetization being 15.63 A-m2/kg, Moreover, this adsorbent can be applied in wide pH range （pH 4.0-10.0）. Its removal efficiencies for fluoride can be reached above 84% with the initial fluoride concentration of 25 mg/L over the pH range 4.0-10.0. The adsorption isotherm of fluoride on Fe/Al composite magnetic nanoparticles can be well fitted with Langmuir model, and the maximum adsorption capacity of fluoride is 48 mg/g.

关 键 词：氟离子 吸附 纳米磁性材料 铁铝复合物 

分 类 号：TG146[一般工业技术—材料科学与工程]