17α-Ethinylestradiol removal from water by magnetic ion exchange resin
17α-Ethinylestradiol removal from water by magnetic ion exchange resin
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磁性离子交换树脂从水中去除 17 α-炔雌醇
DOI：
10.1016/j.cjche.2017.08.006
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发表时间：
2018-04-01
影响因子：
3.8
通讯作者：
Liu, Nian
中科院分区：
文献类型：
--
作者：
Wang, Liang;Liu, Lu;Liu, Nian
磁性离子交换树脂（MIEX）由于其快速有效地去除溶解性有机碳（DOC）而在饮用水处理中受到相当大的关注。两种机制，即，离子交换，可逆和不可逆的吸附，可以发生在污染物去除过程中的MIEX。本文研究了MIEX对17 α-乙炔基乙炔（EE 2）的去除机理。EE 2是一种典型的雌激素微污染物，在天然水体中以中性分子形式存在，其电荷密度接近于零[（0.00000219 +/- 0.00000015）meq. (mu g EE2）（-1）]。然而，EE 2的MIEX的去除率远远高于其他微污染物的先前报道。通过多循环吸附-再生实验和离子交换化学计量分析，阐明了MIEX树脂去除EE 2的机理。结果表明，MIEX去除EE 2的主要机理是离子交换，而不是可逆微孔吸附。基于Dorman理论的实验分析表明，树脂微球内部微环境为碱性，在碱性环境中EE 2会电离成带负电荷的基团。结果表明，离子交换反应发生在MIEX树脂的孔内，MIEX对EE 2的去除过程主要是离子交换反应。(C)2017中国化学工业与工程学会，化学工业出版社。All rights reserved.
Magnetic ion exchange (MIEX) resins have received considerable attention in drinking water treatment due to their fast and efficient removal of dissolved organic carbon (DOC). Two types of mechanisms, i.e., ion exchange, reversible and irreversible adsorption, may occur during pollutants removal by MIEX. This work examined the removal mechanism of 17 alpha-Ethinylestradiol (EE2) by MIEX. As one of typical estrogen micro-pollutants, EE2 existed as neutral molecule in natural water, and its charge density was close to zero [(0.00000219 +/- 0.00000015) meq.(mu g EE2)(-1)] based on the potentiometric titration method. However, the removal of EE2 by MIEX was much higher than that of other micro-pollutants previously reported. Multi-cycle adsorption-regeneration experiments and ion exchange stoichiometry analysis were conducted to elucidate the removal mechanism of EE2 by MIEX resin. The results suggested that the main removal mechanism of EE2 by MIEX was ion exchange instead of reversible micro-pore adsorption. The experimental analysis based on Dorman theory indicated that the internal micro-environment of resin beads was alkaline, in the alkaline environment EE2 would be ionized into negatively charged groups. As a result, ion exchange reaction occurred inside the pore of MIEX resin, and the removal process of EE2 by MIEX was dominated by the ion exchange reaction. (C) 2017 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. All rights reserved.