PEI-grafted magnetic porous powder for highly effective adsorption of heavy metal ions
PEI-grafted magnetic porous powder for highly effective adsorption of heavy metal ions
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PEI接枝磁性多孔粉高效吸附重金属离子
DOI：
10.1016/j.desal.2011.08.001
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发表时间：
2011-10-17
期刊：
影响因子：
9.9
通讯作者：
Xie, Gengxin
中科院分区：
文献类型：
--
作者：
Pang, Ya;Zeng, Guangming;Xie, Gengxin
本研究的目的是研制一种高效吸附重金属的聚乙烯亚胺（PEI）接枝磁性多孔吸附剂。傅里叶红外分析证实了PEI接枝的过程。通过批量试验考察了其吸附性能。对Cu2+、Zn2+和Cd2+的吸附依赖于pH值，pH值的增加有利于金属离子的去除。吸附平衡在10 min内达到，用拟二阶模型描述。吸附等温线符合Langmuir模型，对Cu2+、Zn2+和Cd2+的最大吸附量分别为157.8、138.8和105.2 mg/g。三种金属离子之间的竞争吸附表现为Cu2+ > + Zn2+ > + Cd2+的优先吸附。该磁性吸附剂具有良好的酸碱稳定性。此外，用0.02 mol/L EDTA溶液可再生废吸附剂，且吸附容量损失不明显。(C) 2011 Elsevier B.V.版权所有
The aim of this study is to develop a polyethylenimine (PEI) grafted magnetic porous adsorbent for highly effective adsorption of heavy metals. The process of grafting PEI was confirmed by Fourier transform infrared (FTIR) analysis. Batch tests were carried out to investigate the adsorption performance. Adsorption of Cu2+, Zn2+ and Cd2+ was dependent on pH and increasing the pH was favorable to metal ions removal. The adsorption equilibrium was reached within 10 min and well described by pseudo-second-order model. The sorption isotherms of the adsorbent for these metals fitted well with Langmuir model, with maximum adsorption capacities of 157.8, 138.8 and 105.2 mg/g for Cu2+, Zn2+ and Cd2+, respectively. Competitive adsorption among the three metal ions showed a preferential adsorption of Cu2+ > Zn2+ >Cd2+. The magnetic adsorbent exhibited excellent acid-alkali stability. In addition, the exhausted adsorbent can be regenerated by 0.02 mol/L EDTA solution without significant adsorption capacity loss. (C) 2011 Elsevier B.V. All rights reserved.