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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Thermosensitive poly(N-isopropylacrylamide)-grafted magnetic nanoparticles for efficient treatment of emulsified oily wastewater
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Thermosensitive poly(N-isopropylacrylamide)-grafted magnetic nanoparticles for efficient treatment of emulsified oily wastewater

机译：热敏性聚（N-异丙基丙烯酰胺）接枝的磁性纳米粒子，用于乳化含油废水的有效处理

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摘要

A class of thermosensitive and reusable magnetic nanoparticles (MNPs) was developed for removing emulsified oil droplets from aqueous media. Magnetic iron oxide (MIO) nanoparticles were prepared with a coprecipitation method, followed by coating with silica layer and further modification with gamma-methacryloxypropyl triisopropoxidesilane (MPS). Poly(N-isopropylacrylamide) (PNIPAM) molecular chains were then anchored onto the surfaces of MNPs via a "grafting through" reaction. The efficiency of synthetic MNPs for treating emulsified oily wastewater was evaluated as a function of dosage, pH, temperature and reusability. PNIPAM-grafted MNPs exhibited high demulsification efficiency at lower temperature, while decreased dramatically when the temperature exceeded the lower critical solution temperature (LCST) of PNIPAM (-33 degrees C); moreover, MNPs could be facilely regenerated by rinsing with hot water and could be reused up to 7 cycles. The results indicated that PNIPAM-grafted MNPs could potentially be a new promising and environmentally friendly approach for effectively treating emulsified oil in wastewater. (C) 2016 Elsevier B.V. All rights reserved.
机译：开发了一类热敏和可重复使用的磁性纳米颗粒（MNP），用于从水性介质中去除乳化的油滴。通过共沉淀法制备磁性氧化铁（MIO）纳米粒子，然后涂覆二氧化硅层并进一步用γ-甲基丙烯酰氧基丙基三异丙氧基硅烷（MPS）进行改性。然后通过“嫁接”反应将聚（N-异丙基丙烯酰胺）（PNIPAM）分子链锚固在MNP的表面上。根据剂量，pH，温度和可重复使用性对合成的MNP处理乳化含油废水的效率进行了评估。 PNIPAM接枝的MNP在较低温度下表现出较高的破乳效率，而当温度超过PNIPAM的下临界溶液温度（LCST）（-33摄氏度）时，破乳效率大大降低。此外，MNPs可以通过用热水冲洗而容易地再生，并且可以重复使用多达7个循环。结果表明，PNIPAM接枝的MNP可能是有效处理废水中的乳化油的一种新的有前途和环境友好的方法。 （C）2016 Elsevier B.V.保留所有权利。

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