改性白菜叶渣对重金属Zn2＋吸附性能

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，获得加人量（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。

Adsorption performance of heavy metal Zn2＋ by modified cabbage

The experiment was conducted to study the adsorption effect of abandoned cabbage on Zn2＋ , which was based on static adsorption. The maximum absorption rate was obtained by regulating different factors involving addition （ X1 ） , concentration （X2 ） , time （X3 ） , pH （X4 ） , temperature （X5 respectively. Experimental factors was optimized by quadratic regression orthogonal rotating combination design,as well as the related char- acterizations of adsorption isotherm and kinetic model were examined. The results showed that the zinc ions were absorbed by cabbage slag up to maximum of 95.08% under the condition that addition 0.2 g,2 mg/L of Zn2＋ , pH 4,5 h and 40℃. The experimental result reached 93.89% and was nearly consistent with forecast value. The comparison test demonstrated the cabbage slag was a better absorbent compared with activated carbon. According to the adsorption isotherm at 25℃ and 35℃ ,the adsorption of Zn2＋ by abandoned cabbage slag should be regar- ded as a complex process in which chemical and physical absorption function altogether.