Department of Chemical Engineering, Faculty of Chemical and Natural Resources Engineering, Universiti Teknologi Malaysia, UTM Skudai, Johor, Malaysia.
J Hazard Mater. 2010 Sep 15;181(1-3):755-62. doi: 10.1016/j.jhazmat.2010.05.078. Epub 2010 May 24.
In this study, calcined Lapindo volcanic mud (LVM) was used as an adsorbent to remove an anionic dye, methyl orange (MO), from an aqueous solution by the batch adsorption technique. Various conditions were evaluated, including initial dye concentration, adsorbent dosage, contact time, solution pH, and temperature. The adsorption kinetics and equilibrium isotherms of the LVM were studied using pseudo-first-order and -second-order kinetic equations, as well as the Freundlich and Langmuir models. The experimental data obtained with LVM fits best to the Langmuir isotherm model and exhibited a maximum adsorption capacity (q(max)) of 333.3 mg g(-1); the data followed the second-order equation. The intraparticle diffusion studies revealed that the adsorption rates were not controlled only by the diffusion step. The thermodynamic parameters, such as the changes in enthalpy, entropy, and Gibbs free energy, showed that the adsorption is endothermic, random and spontaneous at high temperature. The results indicate that LVM adsorbs MO efficiently and could be utilized as a low-cost alternative adsorbent for the removal of anionic dyes in wastewater treatment.
在这项研究中，煅烧后的拉彭火山泥（LVM）被用作吸附剂，通过批量吸附技术从水溶液中去除阴离子染料甲基橙（MO）。评估了各种条件，包括初始染料浓度、吸附剂用量、接触时间、溶液 pH 值和温度。使用拟一级和拟二级动力学方程以及 Freundlich 和 Langmuir 模型研究了 LVM 的吸附动力学和平衡等温线。用 LVM 获得的实验数据最符合 Langmuir 等温线模型，表现出最大吸附容量（q(max)）为 333.3 mg g(-1)；数据符合二级方程。内扩散研究表明，吸附速率不仅受扩散步骤控制。热力学参数，如焓、熵和吉布斯自由能的变化表明，吸附是吸热的、随机的，在高温下是自发的。结果表明，LVM 能够有效地吸附 MO，可作为废水处理中去除阴离子染料的低成本替代吸附剂。
