Hsieh Ching-Hong, Lo Shang-Lien, Kuan Wen-Hui, Chen Ching-Lung
Research Center for Environmental Pollution Prevention and Control Technology, Graduate Institute of Environmental Engineering, National Taiwan University, 71, Chou-Shan Road, Taipei 106, Taiwan, ROC.
J Hazard Mater. 2006 Aug 21;136(2):338-44. doi: 10.1016/j.jhazmat.2005.12.026. Epub 2006 Jan 27.
Microwave stabilized heavy metal sludge was used as an adsorbent to remove the copper ions from aqueous solution. The adsorption characteristics of copper on the stabilized-sludge were studied by various models, such as Freundlich and Langmuir isotherm equation. Results show that the pH(zpc) of stabilized-sludge was at 9.2-9.5. Moreover, the adsorption of copper ions onto the stabilized-sludge surface was mainly on account of the heterogeneous surface of the stabilized-sludge. In the dynamic study, the experimental data was fitted to the intraparticle diffusion model, pseudo-first order model and pseudo-second order model. However, the experimental data was only well correlated with pseudo-second order model with the correlation coefficient>0.995. Furthermore, both Freundlich and Langmuir isotherm equations were found to represent the measured adsorption data well. From the Langmuir equation, the adsorption capacity increased from 18 to 28 mg/g as the temperature rose from 15 to 55 degrees C, since this adsorption process was an endothermic reaction. After this adsorption process, copper ions can be concentrated on and in a small bead and recovery efficiently.
微波稳定化重金属污泥被用作吸附剂以去除水溶液中的铜离子。通过弗伦德利希（Freundlich）和朗缪尔（Langmuir）等温方程等各种模型研究了铜在稳定化污泥上的吸附特性。结果表明，稳定化污泥的pH（零电荷点）为9.2 - 9.5。此外，铜离子在稳定化污泥表面的吸附主要归因于稳定化污泥的非均相表面。在动力学研究中，将实验数据拟合到颗粒内扩散模型、准一级模型和准二级模型。然而，实验数据仅与准二级模型具有良好的相关性，相关系数>0.995。此外，发现弗伦德利希和朗缪尔等温方程均能很好地表示实测吸附数据。根据朗缪尔方程，随着温度从15℃升至55℃，吸附容量从18mg/g增加到28mg/g，因为该吸附过程是吸热反应。经过该吸附过程后，铜离子可浓缩在小珠子上及内部并有效回收。
