纳米铁烧结活性碳制备及其对Pb^(2+)的吸附

Preparation of Iron Nanoparticles Supported on Sintered Active Carbon and Its Adsorption of Pb^(2+)

为了去除水中的重金属,采用液相还原法制备纳米铁并负载在烧结活性碳上,比较不同纳米铁/烧结活性碳原料配比的负载效果,用扫描电镜对其表面和断面结构进行表征,考察了不同纳米铁/烧结活性碳原料配比所制成的纳米铁烧结活性碳对Pb^(2+)的吸附效果。结果表明,在扫描电镜下观察到纳米铁粒子较均一地分布在烧结活性碳的表面及孔内;不同的原料配比对Pb^(2+)的吸附效果有较大的影响,纳米铁/烧结活性碳最佳配比为1.8 mmol/g;最佳配比所制备的纳米铁烧结活性碳在投加量为2.5 g/L,吸附时间120 min时,Pb^(2+)的去除率可达到48.8%,对Pb^(2+)的吸附量达195.2 mg/g。

In order to remove heavy metal in water,iron nanoparticles（ NPs） are prepared via a NaBH4-reduced method and supported on sintered active carbon. The effects of different ratios of Fe^3＋and sintered active carbon on the surface morphology are compared. The surface morphology of the prepared material is characterized by SEM. The SEM photos show that the iron NPs are evenly distributed on the surface and in the pore of the active carbon. Different ratios of Fe^3 ＋and sintered active carbon affect the adsorption of Pb^2＋obviously,and the best ratio is 1. 8 mmol / g. Iron nanoparticles supported on sintered active carbon prepared in best ratio on sorption of Pb^2＋ is also studied. The removal rate and adsorption capacity of Pb^2＋（II） can reach 48. 8% and 195. 20 mg /g,respectively,at conditions of p H 6. 5,contact time of 120 min,dosage of 2. 5 g / L,the initial concentration of Pb^2＋ of 100 mg / L. The experiment provides a sound basis for exploratory experiment teaching.