纳米磁性铁铝复合物的制备及其除氟性能

来源期刊:中南大学学报(自然科学版)2014年第1期

论文作者:赵娜 王云燕 杨卫春 尤翔宇 柴立元

文章页码:334 - 341

关键词:氟离子;吸附;纳米磁性材料;铁铝复合物

Key words:fluoride ions; adsorption; magnetic nanoparticles; iron-aluminum composite

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。

Abstract: 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.

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