Adsorption of Cu^(2+), Zn^(2+) and Cd^(2+) on Bacillus subtilis

A process of biosorption of Cu^2＋, Zn^2＋ and Cd^2＋ on Bacillus subtilis was investigated. The experiments show that the process of biosorption is quite fast, The maximum adsorption was reached after 5 min and hardly changed with time. The experimental data was analyzed using four sorption kinetic models： the pseudo-first-order, the Ritchie second-order, the modified second-order and the Elovich equations, which helped to determine the best-fit equation for the sorption of metal ions onto biomass, The results show that both the Ritchie second-order and modified secondorder equations can fit the experimental data. The Langmuir model is able to accurately describe adsorption of Cu^2＋ and Zn^2＋ on B. subtilis. The experimental data points of adsorption Cd^2＋ and Zn^2＋ on B. subtilis are described by Freundlich isotherms model.

Cu^(2+) 的简历吸着的一个过程， Zn^(2+) 和调查的杆菌 subtiliswas 上的 Cd^(2+) 。实验证明简历吸着的过程是相当快的。最大的吸附在 5 min 以后被到达并且几乎没随着时间变化。试验性的数据用四吸着被分析运动模型：伪 first-order， Ritchie 秒顺序， modifiedsecond 顺序和 Elovich 方程，它帮助为金属离子的吸着决定最好合适的方程到生物资源上。结果证明 Ritchie 秒顺序和修改秒顺序方程能适合试验性的数据。兰米尔模型能精确地在 B 上描述 Cu^(2+) 和 Zn^(2+) 的吸附。敏锐，试验性的数据在 B 上吸附 Cd^(2+) 和 Zn^(2+) 指。敏锐被等温线建模的 Freundlich 描述。