EDTA 功能化磁性纳米粒子吸附剂用于处理镉和铅污染的水。
EDTA functionalized magnetic nanoparticle sorbents for cadmium and lead contaminated water treatment.
机构信息
Bren School of Environmental Science and Management, University of California at Santa Barbara, CA 93106, USA.
Bren School of Environmental Science and Management, University of California at Santa Barbara, CA 93106, USA.
出版信息
Water Res. 2015 Sep 1;80:159-68. doi: 10.1016/j.watres.2015.05.011. Epub 2015 May 10.
Cadmium (Cd(2+)) and lead (Pb(2+)) are toxic to human beings and other organisms, and the U.S. Environmental Protection Agency (EPA) has classified both as probable human carcinogens. In this study, a regenerable magnetic ligand particle (Mag-Ligand) which includes a metal-binding organic ligand (EDTA) attached to an iron oxide nanoparticle was developed for rapid removal of Cd(2+) and Pb(2+) as well as other metals from contaminated water. Mag-Ligand showed fast removal ability for both Cd(2+) (<2 h) and Pb(2+) (<15 min) with relatively high sorption capacity (79.4 and 100.2 mg/g for Cd(2+) and Pb(2+), respectively). The removal performance of Mag-Ligand was high across a wide pH range (3-10) as well as in the presence of competitive metal ions (Ca(2+) and Mg(2+)). In addition, Mag-Ligands can be easily regenerated (washed by 1% HCl) and reused several cycles with high sorption capacity. This study indicated that Mag-Ligand is a reusable sorbent for rapid, convenient, and efficient removal of Cd(2+) and Pb(2+) from contaminated aquatic systems.
镉（Cd(2+)）和铅（Pb(2+)）对人类和其他生物是有毒的，美国环境保护署（EPA）已将两者都归类为可能的人类致癌物。在这项研究中，开发了一种可再生的磁性配体颗粒（Mag-Ligand），它包括与氧化铁纳米颗粒相连的金属结合有机配体（EDTA），用于从受污染的水中快速去除 Cd(2+)和 Pb(2+)以及其他金属。Mag-Ligand 对 Cd(2+)（<2 h）和 Pb(2+)（<15 min）具有快速去除能力，并且具有较高的吸附容量（分别为 79.4 和 100.2 mg/g）。Mag-Ligand 在很宽的 pH 范围（3-10）和存在竞争金属离子（Ca(2+)和 Mg(2+)）的情况下都具有很高的去除性能。此外，Mag-Ligands 可以通过 1% HCl 轻松再生（洗涤）并在高吸附容量下重复使用几个循环。这项研究表明，Mag-Ligand 是一种可重复使用的吸附剂，可用于快速、方便、高效地从受污染的水生系统中去除 Cd(2+)和 Pb(2+)。
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