NaOH改性笋壳的正交实验及吸附动力学研究

以笋壳为原料,采用氢氧化钠为活化剂制备改性笋壳,通过正交实验研究了各影响因素对改性笋壳性能的影响.结果表明,影响最大的因素是NaOH浓度,其次是浸泡时间,固液比影响最小.NaOH改性笋壳制备的最佳条件是:NaOH浓度为2mol/L,固液比为1∶2,浸泡时间48h.准二级动力学模型能够很好地描述改性笋壳对亚甲基蓝的吸附动力学行为.改性笋壳对亚甲基蓝的吸附是一个吸热过程,吸附活化能较小,主要为物理吸附过程.

Orthogonal Experiment and Adsorption Kinetics of NaOH Modified Bamboo Shell

Bamboo shell was used as raw material,and NaOH modified bamboo shell was prepared by NaOH activation.The effect of preparation condition was studied by orthogonal experiment.The result showed that the main influential factor was the NaOH concentration followed by the soaking time and the solid-liquid ratio.The optimum preparation conditions were:NaOH concentration was 2mol/L;the solid-liquid ratio was 1∶2;the soaking time was 48 h.The adsorption of methylene blue on modified bamboo shell fitted well to the pseudo second-order kinetic model.The adsorption of methylene blue on modified bamboo was an endothermic process,has a small energy of activation,and was mainly aphysical adsorption process.