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改性白菜叶渣对重金属Zn2+吸附性能

Keywords: 白菜渣,锌离子,二次回归正交旋转组合设计,吸附

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Abstract:

为了研究白菜叶渣对锌离子的吸附作用,采用静态吸附的方法,以酸碱处理后的废弃白菜渣为原材料,获得加入量(X1)、浓度(X2)、时间(X3)、pH(X4)和温度(X5)各单因素对Zn2+的最佳吸附点,再通过二次回归正交旋转组合设计对白菜渣吸附Zn2+的条件进行优化,并讨论了吸附过程中吸附等温线与动力曲线的相关特征。结果表明,当加入量0.2g、浓度2mg/L、吸附时间5h、pH为4以及温度20℃时,吸附达到最大95.08%,验证所测最大吸附率93.89%,与预测值基本相符。对比实验说明白菜渣对Zn2吸附效果要优于活性炭。25℃和35℃时的等温线的拟合结果表明,白菜渣对Zn2+是物理化学共同吸附的复杂过程。

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