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采用静态批式法研究了63 Ni(Ⅱ)在γ-Al2O3上的吸附行为。探讨了震荡时间、pH、离子强度、γ-Al2O3浓度以及腐殖酸对吸附的影响。实验结果表明:在低pH条件下,离子强度对63 Ni(Ⅱ)的吸附影响很大,63 Ni(Ⅱ)的吸附主要是离子交换和外层表面络合作用;在高pH条件下,63 Ni(Ⅱ)的吸附受pH影响较小,63 Ni(Ⅱ)的吸附主要是内层表面络合作用。溶液中的腐殖酸,在低pH条件下促进63 Ni(Ⅱ)在γ-Al2O3上的吸附,而在高pH条件下抑制63 Ni(Ⅱ)在γ-Al2O3上的吸附。
Adsorption behavior of 63 Ni (Ⅱ) on γ-Al2O3 was studied by static batch method. The effects of shaking time, pH, ionic strength, γ-Al2O3 concentration and humic acid on the adsorption were discussed. The experimental results show that the ionic strength has a great influence on the adsorption of 63 Ni (Ⅱ) under low pH conditions. The adsorption of 63 Ni (Ⅱ) is mainly on the surface of ion exchange and the surface layer. At high pH, The adsorption of Ni (Ⅱ) is less affected by pH, and the adsorption of 63 Ni (Ⅱ) is mainly on the surface of the inner layer. The humic acid in the solution promoted the adsorption of 63 Ni (Ⅱ) on γ-Al2O3 at low pH and inhibited the adsorption of 63 Ni (Ⅱ) on γ-Al2O3 at high pH.