[牛血清白蛋白对镍在δ-二氧化锰上吸附平衡的影响]

[Influence of BSA on adsorption equilibrium of nickel onto delta-MnO2].

作者信息

Zhang Li-na, Ma Zi-chuan, Liu Jing-ze, Cai Ai-jun

机构信息

College of Chemistry and Material Sciences, Hebei Normal University, Shijiazhuang 050016, China.

出版信息

Huan Jing Ke Xue. 2008 Jun;29(6):1676-80.

PMID:18763522

Abstract

The influence of BSA on adsorption equilibrium of Ni2+ onto delta-MnO2 had been investigated using a batch method. It was showed that the adsorption-pH curves of Ni2+ onto delta-MnO2 were "S-shape" at [BSA] = 10 mg x 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) approximately 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 approximately III > IV. In addition, the adsorption of Ni2+ onto delta-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 delta-MnO2.

摘要

采用分批法研究了牛血清白蛋白（BSA）对Ni2+在δ-MnO2上吸附平衡的影响。结果表明，在[BSA]=10mg·L(-1)时，Ni2+在δ-MnO2上的吸附-pH曲线呈“S”形，且在BSA存在下吸附的跳跃范围会向高pH值移动。影响程度与BSA的添加顺序和浓度有关，趋势为IV（先添加BSA）>III（同时添加Ni2+和BSA）≈II（先添加Ni2+）。在相同pH值下，吸附百分比随BSA浓度的增加而降低。在BSA存在下，Langmuir吸附模型能较好地拟合实验数据。与BSA添加顺序相关的最大吸附容量为I（无BSA）>II≈III>IV。此外，Ni2+在δ-MnO2上的吸附随温度升高而增加。发现在pH = 4.0和pH = 7.0时吸附是不可逆的。BSA对Ni2+在δ-MnO2上吸附的可逆性没有影响。