玉米芯活性炭吸附重金属离子的研究

Adsorption of Heavy Metal Ions by Corn Cob Activated Carbon

以玉米芯为实验原材料,制得活性炭,探究活性炭在不同的重金属浓度、pH以及不同的吸附时间下对重金属的吸附效果,并利用正交试验探究活性炭的最佳吸附条件。结果显示:重金属Pb的最佳吸附浓度为5μg/mL,最佳吸附时间为5 h,最佳溶液pH 5;重金属Hg的最佳吸附浓度为30μg/mL,最佳吸附时间为5 h,最佳溶液pH 1;重金属Cd的最佳吸附浓度为5μg/mL,最佳吸附时间为5 h,最佳溶液pH 5。方法操作简单快捷、原料来源广泛、制作成本低,且制备的活性炭对Pb、Hg、Cd等重金属离子具有良好的吸附能力,便于广泛运用。

Activated carbon was prepared with corn cob as the raw material,to explore the adsorption effect of activated carbon on heavy metals at different concentrations,pH and different adsorption time,and to explore the optimal adsorption conditions of activated carbon by orthogonal test.The best adsorption concentration of Pb was 5μg/mL,the best adsorption time was 5 h,and the best solution was pH 5.The optimal adsorption concentration of heavy metal Hg was 30μg/mL,the optimal adsorption time was 5 h,and the optimal solution was pH 1.The optimal adsorption concentration of heavy metal Cd was 5μg/mL,the optimal adsorption time was 5 h,and the optimal solution was pH 5.The process is simple and rapid,the source of raw materials is wide,the production cost is low,and the prepared activated carbon has good adsorption capacity for heavy metal ions such as lead,mercury and cadmium,so as to be widely used.