中文摘要：

研究了溶液中牛血清白蛋白（BSA）的存在对Cd（Ⅱ）与δ-MnO2间吸附平衡性质的影响。结果表明,BSA存在下,Cd（Ⅱ）在δ-MnO2表面的吸附率-pH曲线仍为典型的“S”形,BSA使Cd（Ⅱ）的吸附突跃向高pH方向移动,Cd（Ⅱ）的吸附率随离子强度的增大而减小。并且,BSA存在及pH=3.0下,Cd（Ⅱ）的等温吸附线遵循Langmuir等温吸附方程,但Cd（Ⅱ）饱和吸附量由34.97 mg/g降低到22.83 mg/g。当pH=5.0时,Cd（Ⅱ）吸附率几乎不受BSA的影响;pH=2.0和pH=3.0、BSA浓度小于20 mg/L时,Cd（Ⅱ）吸附率随BSA浓度的增大而显著减小;当BSA浓度大于20 mg/L时,Cd（Ⅱ）吸附率几乎不再减小。研究结果增进了对Cd（Ⅱ）环境化学行为的认识。

英文摘要：

The effect of BSA on the adsorption equilibrium of Cd（Ⅱ）onto δ-MnO2 is studied.The results show that in the presence of BSA,the adsorption-pH curve of Cd（Ⅱ） onto δ-MnO2 is of S-shape.BSA enables the Cd（Ⅱ） adsorption to leap toward higher pH direction and its adsorption amount decreases with the increase of ionic strength.In the presence of BSA at a pH lower than 3.0,the Cd（Ⅱ） adsorption isotherm follows Langmuir equation but the Cd（Ⅱ） saturated adsorption amount is reduced from 34.97 mg/g to 22.83 mg/g.When pH = 5.0,the Cd（Ⅱ） adsorption is little influenced by BSA.When pH = 2.0 and pH=3.0 and BSA concentration is lower than 20 mg/L,the Cd（Ⅱ） adsorption is evidently reduced with the increase of BSA concentration.When BSA concentration is greater than 20 mg/L,the Cd（Ⅱ） adsorption is hardly reduced.The study helps increase the understanding of Cd（Ⅱ）＇s environmental chemical behavior.