Electrically controlled anion exchange based on polypyrrole and carbon nanotubes nanocomposite for perchlorate removal
Electrically controlled anion exchange based on polypyrrole and carbon nanotubes nanocomposite for perchlorate removal
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DOI：
10.1021/es052148u
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发表时间：
2006-06-15
影响因子：
11.4
通讯作者：
Bontha, Jagan
中科院分区：
文献类型：
--
作者：
Lin, Yuehe;Cui, Xiaoli;Bontha, Jagan
以高比表面积碳纳米管为载体，电开关离子交换法（ESIX）制备了一种简单高效的去除高氯酸盐的方法。导电聚合物如聚吡咯的氧化还原转换伴随着离子交换进入或离开聚合物。这种效应可用于开发用于水净化的电可切换离子交换器，特别是用于去除阴离子。本文采用循环伏安法和X射线光电子能谱（XPS）研究了电化学法制备的聚吡咯在含有和不含有碳纳米管（CNT）骨架的玻碳电极上的阴离子交换行为和离子交换容量。研究发现，碳纳米管主链的存在提高了聚吡咯的阴离子交换稳定性，这可能是由于碳纳米管与聚吡咯之间的相互作用增强所致。计时电流法研究表明，电开关阴离子交换过程可在10 s内完成.利用循环伏安法和X射线光电子能谱（XPS）研究了PPy/CNTs膜对高氯酸根离子的选择性。本研究的结果点的可能性，开发一个绿色过程中去除ClO 4-废水使用这种新型的纳米结构的聚吡咯/碳纳米管复合薄膜通过电开关阴离子交换。
A simple and highly effective process for perchlorate removal based on electrically switched ion exchange (ESIX) was developed by using polypyrrole (PPy) deposited on high surface area carbon nanotubes. The redox switching of conducting polymers such as polypyrrole is accompanied by the exchange of ions into or out of the polymer. This effect could be used for the development of an electrically switchable ion-exchanger for water purification, particularly for the removal of anions. In the research presented in this paper, the anion-exchange behavior and ion-exchange capacity of electrochemically prepared polypyrrole on glassy carbon electrodes with and without carbon nanotube (CNT) backbones are characterized using cyclic voltammetry and X-ray photoelectron spectroscopy. It has been found that the presence of carbon nanotube backbone results in an improvement in the anion exchange stability of polypyrrole, which may be due to the stronger interaction between carbon nanotubes and polypyrrole. Chronoamperometric studies show that the process of electrically switched anion exchange could be finished within 10 s. The selectivity of PPy/CNTs films for the perchlorate ion is demonstrated using cyclic voltammetry and X-ray photoelectron spectroscopy (XPS). The results of the present study point to the possibility of developing a green process for removing ClO4- from wastewater using such a novel nanostructured PPy/CNT composite thin film through an electrically switched anion exchange.