The State Key Laboratory of Environmental Chemistry and Ecotoxicology of Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
J Colloid Interface Sci. 2011 Oct 1;362(1):107-12. doi: 10.1016/j.jcis.2011.06.032. Epub 2011 Jun 22.
In this article, C(18)/NH(2) mixed group modified Fe(3)O(4)/SiO(2) magnetic nanoparticles (Fe(3)O(4)/SiO(2)/C(18)+NH(2) MNPs) were successfully synthesized and used for the extraction of perfluorinated compounds (PFCs) from large volume of water solution. The Fe(3)O(4)/SiO(2)/C(18)+NH(2) MNPs, about 25 nm in diameter, possess high extraction ability to the anionic organic pollutants due to the dual function of hydrophobic octadecyl group and cationic aminopropyl groups at low pH. More than 90% of the targets can be extracted from 500 mL of water solution with 0.1g of the MNP sorbent at pH 3. Twenty min is sufficient to reach adsorption equilibrium, and the targets can be desorbed from the sorbent readily with 12 mL of alkalized methanol after magnetic separation. Simplified extraction procedure could be achieved because of the superparamagnetism and high saturation magnetization of the sorbent (44 emu g(-1)). Therefore, preconcentration of trace level of PFCs from water solution can be performed by using this Fe(3)O(4)/SiO(2)/C(18)+NH(2) MNP sorbent which are stable for multiple reuses.
本文成功合成了 C(18)/NH(2) 混合基团修饰的 Fe(3)O(4)/SiO(2) 磁性纳米粒子（Fe(3)O(4)/SiO(2)/C(18)+NH(2) MNPs），并将其用于从大量水溶液中萃取全氟化合物（PFCs）。Fe(3)O(4)/SiO(2)/C(18)+NH(2) MNPs 的粒径约为 25nm，由于疏水性十八烷基基团和阳离子氨丙基基团的双重作用，在低 pH 值下对阴离子有机污染物具有高萃取能力。在 pH 3 下，只需 0.1g 磁性纳米粒子吸附剂即可从 500mL 水溶液中萃取超过 90%的目标物。20min 即可达到吸附平衡，经磁分离后，只需 12mL 碱性甲醇即可将目标物从吸附剂上解吸。由于吸附剂具有超顺磁性和高饱和磁化强度（44 emu g(-1)），因此可以简化萃取过程。因此，使用这种 Fe(3)O(4)/SiO(2)/C(18)+NH(2) 磁性纳米粒子吸附剂可以从水溶液中预浓缩痕量的 PFCs，并且该吸附剂可以稳定地重复使用多次。
