多孔镁铝尖晶石纳米粉体的合成及其吸附性能研究

Synthesis and Adsorption Properties of Porous Magnesia-aluminum Spinel Nano-powders

以无水氯化铝、无水氯化镁和无水乙醇为原料,采用非水解溶胶-凝胶法合成多孔镁铝尖晶石纳米粉体,经XRD、SEM、BET、UV-Vis及纳米粒度分析仪等表征了粉体物相、形貌及吸附特性等。结果表明,经900℃下可制备出物相单一、球形的MgAl2O4粉体,粉体平均粒径为35 nm,存在较为丰富的孔道结构,比表面积较大为70. 03 m2/g,平均孔径为15 nm,其对亚甲基蓝染料的去除率为64%。

Taking anhydrous aluminum chloride, anhydrous magnesium chloride and anhydrous ethanol as raw materials, magnesium aluminate spinel powder was synthesized by non-hydrolyzable sol- gel method. The phase, morphology, particle size and adsorption characteristics of the powder were characterized by XRD, SEM, BET, nano-particle size analyzer and UV spectrophotometer. The results showed that the single-grained magnesium aluminate spinel powder could be prepared at 900 ℃. The average particle size of the powder was 35 nm. There was a rich pore structure. The specific surface area of the powder particles was 70.03 m 2/g, and the average aperture was 15 nm. The removal rate of methylene blue dye by magnesium aluminum spinel powder was 64%.