| 牛血清白蛋白对Ni2+与δ-MnO2间吸附平衡的影响 |
| 摘要点击 2167 全文点击 1347 投稿时间：2007-06-22 修订日期：2007-08-05 |
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| 中文关键词 BSA Ni2+ δ-MnO2 吸附 可逆性 |
| 英文关键词 BSA Ni2+ δ-MnO2 adsorption reversibility |
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| 中文摘要 |
| 研究了溶液中牛血清白蛋白（BSA）的存在对Ni2+与δ-MnO2间吸附平衡性质的影响.结果表明,BSA存在时Ni2+在δ-MnO2表面的吸附率-pH曲线仍为典型的“S"形，BSA使Ni2+的吸附突跃向高pH方向移动，影响程度与BSA的加入方式及浓度有关，其大小次序为Ⅳ（先加BSA后加Ni2+）>Ⅲ (Ni2+和BSA同时加)≈Ⅱ(先加Ni2+后加BSA).BSA存在时Ni2+的等温吸附线很好地遵循Langmuir等温吸附方程，Ni2+的饱和吸附量与BSA的加入方式有关，其大小次序为Ⅰ（不加BSA）>Ⅱ≈Ⅲ>Ⅳ.升高温度促进Ni2+的吸附.在pH=4.0和pH=7.0条件下，Ni2+在δ-MnO2上的吸附均是不可逆的，BSA对Ni2+的吸附可逆性没有影响. |
| 英文摘要 |
| The influence of BSA on adsorption equilibrium of Ni2+ onto δ-MnO2 had been investigated using a batch method. It was showed that the adsorption-pH curves of Ni2+ onto δ-MnO2 were “S-shape” at ［BSA］=10 mg·L-1, and the leaping range of adsorption would move to high value of pH in the presence of BSA. The extent of effect had relation to the adding order and the concentration of BSA,and the trend was Ⅳ（BSA added first）>Ⅲ (Ni2+ and BSA added simultaneously)≈Ⅱ(Ni2+ added first). The adsorption percentage decreased with increasing BSA concentration at the same value of pH. The Langmuir adsorption model fit the experimental date reasonably in the presence of BSA. The maximum adsorption capacity related to the BSA adding order was Ⅰ （without BSA）>Ⅱ≈Ⅲ>Ⅳ. In addition, the adsorption of Ni2+ onto δ-MnO2 increased with the rise of temperature. It was found that the adsorption was irreversible at pH=4.0 and pH=7.0. BSA had no effect on the reversibility of Ni2+ adsorption onto δ-MnO2. |
