牛血清白蛋白对Cu^2＋与δ-MnO2间吸附平衡性质的影响  

Influence of bovine serum albumin on the adsorption equilibrium between Cu^(2+) and δ-MnO_2

作　　者：张丽娜[1] 马子川[1] 刘敬泽[2] 

机构地区：[1]河北师范大学化学与材料科学学院,石家庄050016 [2]河北师范大学生命科学学院,石家庄050016

出　　处：《生态学杂志》2008年第5期756-761,共6页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(20477009);中国博士后科学基金资助项目(2005037630)

摘　　要：研究了溶液中牛血清白蛋白(BSA)的存在对Cu2+与δ-MnO2间吸附平衡性质的影响,旨在增进人们对Cu2+环境化学行为的认识。结果表明:BSA存在下,Cu2+在δ-MnO2表面的吸附率-pH曲线呈典型的"S"形,加入BSA使Cu2+的吸附突跃向高pH方向移动,影响程度与BSA的加入方式有关,其次序为Ⅳ(先加BSA后加Cu2+)>Ⅲ(Cu2+和BSA同时加)≈Ⅱ((先加Cu2+后加BSA);BSA存在下,Cu2+的等温吸附线遵循Langmuir等温吸附方程,Cu2+的饱和吸附量随BSA浓度的增大而减小,并随BSA的加入方式而改变,其次序为I(不加BSA)>Ⅱ≈Ⅲ>Ⅳ;Cu2+在δ-MnO2上的饱和吸附量随温度的升高而增大。在pH=3.0条件下,Cu2+在δ-MnO2上的吸附是完全可逆的,但pH=5.0的条件下,吸附是不可逆的,BSA对Cu2+的吸附可逆性没有影响。This paper studied the adsorption equilibrium between Cu^2＋ and δ-MnO2 in solution in the presence of bovine serum albumin （BSA） to be beneficial to understand the environmental chemical behavior of Cu^2＋. The results showed that in the presence of BSA, the change pattern of Cu^2＋ adsorption onto δ-MnO2 with pH was a typical S-shape curve. BSA made the adsorption leap of Cu^2＋ moved to high pH range, and the degree was related to the adding order of BSA, i.e., Ⅳ （BSA added first） 〉 Ⅲ （Cu^2＋ and BSA added simultaneously） ≈ Ⅱ （Cu^2＋ added first）. The Cu^2 ＋ adsorption in the presence of BSA was fitted Langmuir adsorption isotherm, and the saturated Cu^2＋ adsorption quantity decreased with increasing BSA concentration and changed with the adding order of BSA, i.e. , Ⅰ （without BSA） 〉 Ⅱ≈Ⅲ〉 Ⅳ. In addition, the maximum capacity of Cu^2＋ onto δ-MnO2 increased with increasing temperature. The adsorption of Cu^2＋ onto δ-MnO2 was reversible at pH 3.0 but irreversible at pH 5.0. BSA had no influence on the reversibility of Cu^2 ＋ adsorption onto δ-MnO2.

关 键 词：牛血清白蛋白 CU^2+ Δ-MNO2 吸附 可逆性 

分 类 号：X171.5[环境科学与工程—环境科学]