CHEN Li,SI Hui,YANG Huan,et al.Study on Absorption of Zn2+ by Saponfied Lettuce Leaf[J].Northern Horticulture,2014,38(12):1-6.
皂化改性莴笋叶渣对Zn2+吸附作用研究
- Title:
- Study on Absorption of Zn2+ by Saponfied Lettuce Leaf
- 文章编号:
- 1001-0009(2014)12-0001-06
- 关键词:
- 莴笋叶渣; Zn2+; 二次回归正交旋转组合设计; 扫描电镜; 傅立叶红外光谱
- Keywords:
- lettuce leaf; Zn2+; quadratic regression orthogonal rotation combination of design; SEM; FTIR
- 分类号:
- S 644.6
- 文献标志码:
- A
- 摘要:
- 以皂化处理的莴笋叶渣为试材,通过二次回归正交旋转组合设计实验,对Zn2+溶液初始浓度、莴笋叶渣加入量、Zn2+溶液pH、温度、时间5个因素进行优化,研究了莴笋叶渣对Zn2+吸附率的最优工艺。结果表明:在Zn2+溶液浓度60 mg/L、莴笋叶渣加入量0.5 g、Zn2+溶液pH 8、温度40℃、时间1 h时,预测吸附率YMax为76.14%;此吸附条件下,验证得到最佳吸附率75.95%,与预测值相符;与活性炭、纤维素吸附效果比较,莴笋叶渣效果最优;Freundlich吸附等温式和二级动力学方程能更好描述莴笋叶渣对Zn2+的吸附热力学情况;SEM观测和FTIR分析可知,莴笋叶渣表面疏松多孔,且-C≡C等基团对Zn2+吸附起到了很好效果。
- Abstract:
- Taking saponfied lettuce leaf as materials,using quadratic regression orthogonal rotating combination design,initial concentration of Zn2+ solution,saponfied lettuce leaf addition,Zn2+solution pH,temperature and time,five factors were optimized,the optimum process of saponfied lettuce leaf absorption Zn2+were studied.The results showed that the maximum absorption rate was 76.14% when 60 mg/L of Zn2+,saponfied lettuce leaf addition 0.5 g,pH 8,40℃,and 1h.Through the experiment the optimum absorption rate was 75.95%,consistent with the predicted value;compared with the absorption effect of activated carbon,cellulose,the absorption of leaf lettuce residue was the best;and the Freundlich absorption isotherm and the second-order kinetic equation could better describe the absorption of lettuce leaf residue ofZn2+;By SEM and FTIR,it showed that lettuce leaf residue surface had loose and porous pore,and -C≡C effectively helped the absorption of Zn2+.
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备注/Memo
第一作者简介:陈莉(1980-),女,山西运城人,硕士,讲师,研究方向为生态环境。E-mail:clsshine@163.com.
基金项目:山西省教育厅科技创新资助项目(2013154);
运城学院院级产学研资助项目(CY-2013004)。
收稿日期:2014-03-07