纳米二氧化锆对砷(Ⅲ)和砷(Ⅴ)的吸附性质研究

Study on the adsorption properties of nanometersized zirconium dioxide to As(Ⅲ) and As(Ⅴ)

采用溶胶凝胶法合成了纳米 Zr O2 ,并用透射电镜及比表面积分析仪测定了产品的平均粒径和比表面积 .研究了纳米 Zr O2 对 As( )和 As( )的吸附及洗脱条件 .在 p H值 1～ 1 0范围内 ,纳米 Zr O2 对 As( )及 As( )的吸附率均大于 98% ,吸附容量分别为 1 .4mg/g As( )和 1 .1 mg/g As( ) ,富集倍数均为 1 0 0倍 ,采用 0 .5 mol/L Na OH可完全洗脱纳米 Zr O2 所吸附的砷 .考察了共存离子对吸附率的影响 ,结果表明纳米 Zr O2 对 As( )和 As( )的吸附具有较好的选择性 .此研究对于含砷废水的处理、痕量砷的分离富集以及砷的形态分析 。

Nanometersized ZrO_2 had been prepared by SolGel process,and powders had been characterized by TEM.The adsorption of nanometersized ZrO_2 to As(Ⅲ) and As(Ⅴ) had been studied.The adsorption rate was 98% when the pH value was in the range of 1~10.The adsorption capacities of As(Ⅲ) and As(Ⅴ) on nanometersized ZrO_2 were 1.4 mg/g and 1.1 mg/g,respectively.The enrichment factors were both 100.Arsenic was absolutely eluted by 0.5 mol/L of NaOH after heated in boiling water bath.The adsorption rate of the recycled ZrO_2 remained high.The effects of coexisting ions were studied and the results showed that the adsorption had good selectivity.The research can be applied to treat arsenic waste water and preconcentration of trace arsenic.