溶胶-凝胶法制备高比表面积的纳米氧化铝及其对过渡金属离子吸附行为的研究

Preparation of High-Specific-Surface-Area Nanometer-sized Alumina by Sol-Gel Method and Study on Adsorption Behaviors of Transition Metal Ions on the Alumina Powder with ICP-AES

溶胶 -凝胶法合成高比表面积纳米氧化铝,以透射电镜(TEM),X射线衍射(XRD),比表面积测定(BET)等手段对所得的纳米氧化铝进行了表征,表明纳米粒子的粒径在 40～ 80nm.以ICP AES为检测手段,考察了纳米氧化铝材料在静态吸附条件下对于过渡金属离子的富集分离性能.结果表明,在pH 8～ 9范围内,过渡金属离子Cu,Mn,Cr,Ni可实现定量分离富集.吸附于纳米氧化铝上的金属离子可用 1.0mol/L盐酸溶液完全解脱.将所合成的纳米氧化铝用于实际标准样品黑麦叶和煤烟灰中Cu,Mn,Cr,Ni的分离富集及ICP AES测定。

High surface area nanometer-sized alumina were successfully prepared by Sol-Gel method. The product was characterized by TEM, XRD and BET. The adsorption of transition metal cations on the high surface-area alumina powder was investigated. The effect of pH on the adsorption of analytes, adsorption isotherm and adsorption capacities were studied and it was found that the nanometer-sized Al2O3 possesses a significant capacity towards sorption of transition metal cations. At pH 8similar to9 quantitative sorption was obtained for Cu, Mn, Cr and Ni. All tested elements can be eluted with 1.0 mol/L HCl The method has been applied to the analysis of some environmental samples with satisfactory results.