碱性改性棕榈生物炭对微囊藻毒素的吸附性能研究

Adsorption of Microcystin from Water by Alkaline Modified Palm Biochar

通过碱活化改性制备棕榈纤维生物炭材料(PB),采用扫描电子显微镜(SEM),对碱性改性棕榈生物炭的结构进行表征,并将该材料用于水体中微囊藻毒素(MC-LR)的高效吸附。采用KOH改性后的棕榈生物炭对MC-LR的吸附性能得到了显著提高,吸附容量达到467.0μg/g。该吸附过程为放热反应,符合Langmuir模型和准二级动力学模型。pH对MC-LR的吸附有重要影响,pH为3时吸附量最大,pH值增加,吸附量显著下降。

Palm fiber biochar(PB)was prepared by alkali activation modification,and the structure of alkali-modified palm biochar was characterized byscanning electron microscopy(SEM),and the material was used for the efficient adsorption of MC-LR from water.The adsorption performance of the KOH-modified palm biochar for MC-LR was significantly improved,with a capacity of 467.0μg/g.The adsorption process was exothermic in accordance with the Langmuir model and quasi-secondary kinetic model.pH had a significant effect on the adsorption of microcystin,with the maximum adsorption at pH=3,and the adsorption capacity decreased significantly with the increase of pH.