烟秆与紫茎泽兰混合炭对氨氮的吸附效应

    Adsorption effect of ammonia nitrogen by carbonized  tobacco stems and Eupatorium adenophorum Spreng

    • 摘要: 以烟秆和紫茎泽兰为试验材料, 混合炭化后制得吸附剂用于吸附废水中的氨氮。 通过对烟秆与紫茎泽兰的混合比例、 炭化温度和炭化时间进行考察, 确定制备混合吸附剂的最佳工艺参数; 探究吸附剂投加量、 吸附时间和溶液初始质量浓度对氨氮去除率的影响; 采用准一级动力学、 准二级动力学模型和颗粒内扩散模型拟合试验数据。 结果表明: 在烟秆和紫茎泽兰混合配比 1∶1、 500℃炭化 30 min 条件下所制备的混合吸附剂, 当溶液初始质量浓度为 20 mg/L 时, 氨氮的去除率可达 85.13%, 单位吸附量达 8.51 mg/g; 通过吸附动力学分析发现, 准二级动力学模型能较好地符合水中氨氮的吸附过程, 相关系数在 0.9641~0.9771 之间。

       

      Abstract: A novel low-cost adsorbent, carbonized tobacco stems and Eupatorium adenophorum Spreng, as a solution to remove ammonia nitrogen from aqueous was reported. The ammonia nitrogen removal efficiency was taken as an evaluation index for optimizing carbonized temperature, carbonized time and particle size of raw materials. Effects of various regulation parameters, such as adsorbent dosage, initial concentration and vibration time were investigated. The results showed that the optimal adsorbent was prepared at 500℃ for 30 min with mix ratio of 1∶1, which could remove 20 mg/L ammonia nitrogen from aqueous solution by 85.13%, the maximum adsorption capacity reached 8.51 mg/g. Kinetics studies indicated that the adsorption process could be well described by the pseudo-second-order equation. The correlation coefficient was 0.9641-0.9771.