Water Conservancy and Civil Engineering College, Shandong Agricultural University, Tai'an, Shandong, 271018, PR China.
Water Conservancy and Civil Engineering College, Shandong Agricultural University, Tai'an, Shandong, 271018, PR China.
J Environ Manage. 2015 Oct 1;162:232-9. doi: 10.1016/j.jenvman.2015.07.057. Epub 2015 Aug 6.
In this work, we synthesized a novel magnetic adsorbent containing litchi pericarps, denoted as MLP, for the removal of malachite green (MG) from solution. The factors influencing MG adsorption, such as contact time, adsorbent dosage, and initial dye concentration, were optimized using the Box-Behnken response surface methodology (RSM). The adsorption isotherms as well as the kinetics and thermodynamics of the adsorption of MG onto MLP are discussed. The results showed that MLP has a maximum adsorption efficiency of 99.5% when the temperature, pH, contact time, adsorbent dosage, and initial MG concentration were optimally set as 25 °C, 6.0, 66.69 min, 5.14 g/L, and 150 mg/L, respectively. The best model to describe this process is the Langmuir isotherm, with the maximum adsorption capacity being 70.42 mg/g. In addition, the kinetics of MG adsorption onto MLP followed a pseudo-second-order model; moreover, thermodynamic analysis suggested that MG adsorption onto MLP is spontaneous and endothermic. Finally, it was found that the new magnetic adsorbent can be separated easily and rapidly from mixed solutions in the presence of an external magnetic field.
在这项工作中，我们合成了一种新型的含有荔枝种皮的磁性吸附剂，记为 MLP，用于从溶液中去除孔雀石绿（MG）。采用 Box-Behnken 响应面法（RSM）优化了影响 MG 吸附的因素，如接触时间、吸附剂用量和初始染料浓度。讨论了 MG 吸附到 MLP 上的吸附等温线以及动力学和热力学。结果表明，当温度、pH 值、接触时间、吸附剂用量和初始 MG 浓度分别优化为 25°C、6.0、66.69 分钟、5.14 克/升和 150 毫克/升时，MLP 的最大吸附效率为 99.5%。描述这一过程的最佳模型是朗缪尔等温线，最大吸附容量为 70.42 毫克/克。此外，MG 吸附到 MLP 上的动力学遵循准二级模型；此外，热力学分析表明，MG 吸附到 MLP 上是自发和吸热的。最后发现，在外磁场存在的情况下，新型磁性吸附剂可以很容易和快速地从混合溶液中分离出来。
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