Dendrimer Enhanced Ultrafiltration. 1. Recovery of Cu(II) from Aqueous Solutions Using PAMAM Dendrimers with Ethylene Diamine Core and Terminal NH2 Groups
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- 作者：Mamadou S. Diallo ; Simone Christie ; Pirabalini Swaminathan ; James H. Johnson ; Jr. ; and William A. Goddard III
- 刊名：Environmental Science & Technology
- 出版年：2005
- 出版时间：March 1, 2005
- 年：2005
- 卷：39
- 期：5
- 页码：1366 - 1377
- 全文大小：984K
- 年卷期：v.39,no.5(March 1, 2005)
- ISSN：1520-5851
文摘
This article discusses the feasibility of using dendrimerenhanced ultrafiltration (DEUF) to recover Cu(II) from aqueoussolutions. Building upon the results of fundamentalinvestigations of Cu(II) binding to PAMAM dendrimerswith ethylenediamine (EDA) core and terminal NH2 groups,we combine (i) dead-end ultrafiltration (UF) experimentswith (ii) atomic force microscopy (AFM) characterization ofmembrane fouling to assess the feasibility of using DEUFto recover Cu(II) from aqueous solutions. On a mass basis,the Cu(II) binding capacities of the EDA core PAMAMdendrimers are much larger and more sensitive to solutionpH than those of linear polymers with amine groups. Thedendrimer-Cu(II) complexes can be efficiently separated fromaqueous solutions by ultrafiltration. The metal ion ladendendrimers can be regenerated by decreasing the solutionpH to 4.0; thus enabling the recovery of the bound Cu(II)ions and recycling of the dendrimers. The UF measurementsand AFM characterization studies show that EDA corePAMAM dendrimers with terminal NH2 groups have verylow tendency to foul the commercially available regeneratedcellulose (RC) membranes evaluated in this study. Theoverall results of these experiments suggest that DEUF isa promising process for recovering metal ions such as Cu(II) from aqueous solutions.