State Key Joint Laboratory of Environment Simulation and Pollution Control, Department of Environmental Science and Engineering, Tsinghua University, Qinghuayuan, Haidian District, Beijing 100084, China.
J Hazard Mater. 2010 May 15;177(1-3):300-6. doi: 10.1016/j.jhazmat.2009.12.032. Epub 2009 Dec 29.
Batch adsorption experiments were conducted for the adsorption of Cd (II) ions from aqueous solution by bamboo charcoal. The results showed that the adsorption of Cd (II) ions was very fast initially and the equilibrium time was 6h. High pH (>or=8.0) was favorable for the adsorption and removal of Cd (II) ions. Higher initial Cd concentrations led to lower removal percentages but higher adsorption capacity. As the adsorbent dose increased, the removal of Cd increased, while the adsorption capacity decreased. Adsorption kinetics of Cd (II) ions onto bamboo charcoal could be best described by the pseudo-second-order model. The adsorption behavior of Cd (II) ions fitted Langmuir, Temkin and Freundlich isotherms well, but followed Langmuir isotherm most precisely, with a maximum adsorption capacity of 12.08 mg/g. EDS analysis confirmed that Cd (II) was adsorbed onto bamboo charcoal. This study demonstrated that bamboo charcoal could be used for the removal of Cd (II) ions in water treatment.
批量吸附实验研究了竹炭对水溶液中 Cd(II)离子的吸附。结果表明，Cd(II)离子的吸附在初始阶段非常迅速，平衡时间为 6h。高 pH 值（≥8.0）有利于 Cd(II)离子的吸附和去除。较高的初始 Cd 浓度导致较低的去除率，但更高的吸附容量。随着吸附剂剂量的增加，Cd 的去除率增加，而吸附容量降低。Cd(II)离子在竹炭上的吸附动力学可以用伪二阶模型最好地描述。Cd(II)离子的吸附行为很好地符合朗缪尔、特姆金和弗罗因德利希等温线，但最符合朗缪尔等温线，最大吸附容量为 12.08mg/g。EDS 分析证实 Cd(II)被吸附到竹炭上。本研究表明，竹炭可用于水处理中去除 Cd(II)离子。
