In this study, the adsorption of methylene blue from aqueous solution by modifying sawdust with KMnO₄ has been studied as an effective adsorbent. The surface and characteristics of the composite are studied by Scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The result demonstrate, that by increasing pH, the amount of methylene blue adsorption also increases, and the amount of optimum removal of this dye (96.36%) was obtained at methylene blue dye pH aqueous solution equal to 6 with initial concentration 100 mg L^-1. The studies have shown that the kinetics of the adsorption process follows the pseudo-second-order model with a correlation coefficient R²>0.999, and equilibrium data conform the Langmuir isotherm model with R²>0.9982 and a maximum capacity of single layer adsorption q_e equal to 100 mgg^-1. Thermodynamically, the reaction is endothermic and spontaneous. Consequently, the result has shown, that the modified sawdust can be used as a quick, inexpensive and effective adsorbent in order for removal of methylene blue dye from aqueous solution.

中文翻译：

---

用KMnO4改性的核桃木屑在间歇系统中从水溶液中去除亚甲基蓝的应用：等温线，动力学和热力学研究

在该研究中，已经研究了通过用KMnO ₄改性木屑从水溶液中吸附亚甲基蓝作为有效吸附剂。通过扫描电子显微镜（SEM），X射线衍射（XRD）和傅里叶变换红外光谱（FTIR）研究了复合材料的表面和特性。结果表明，通过增加p H，亚甲基蓝的吸附量也增加，并且在初始浓度为100 mg的亚甲基蓝染料p H水溶液等于6的条件下，该染料的最佳去除量为96.36％。L ^-1。研究表明，吸附过程的动力学遵循具有相关系数R ²的伪二级模型。> 0.999，并且平衡数据符合Langmuir等温模型，其中R ² > 0.9982 ，单层吸附的最大容量q _e等于100 mgg ^-1。在热力学上，该反应是吸热的并且是自发的。因此，结果表明，改性的木屑可以用作快速，廉价和有效的吸附剂，以便从水溶液中去除亚甲基蓝染料。