Smart magnetic ionic liquid-based Pickering emulsions stabilized by amphiphilic Fe₃O₄ nanoparticles: Highly efficient extraction systems for water purification

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• 作者：Huirong Yang¹ ; ^{yanghuirong@snnu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Hongxia Zhang¹ ; ^{zhanghongxia@snnu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Junxia Peng ; ^{junxiapeng@snnu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Yuanyuan Zhang ^{zhangyuanyuan2013@snnu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Guanqun Du ^{duguanqun@snnu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Yu Fang ^{yfang@snnu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Pickering emulsion ; Magnetically responsive ; Extraction ; Ionic liquid ; Water purification
• 刊名：Journal of Colloid and Interface Science
• 出版年：2017
• 出版时间：1 January 2017
• 年：2017
• 卷：485
• 期：Complete
• 页码：213-222
• 全文大小：2864 K

文摘

This study presents the general method to formulate magnetically responsive ionic liquid (IL)-based Pickering emulsions that are stabilized by amphiphilic Fe₃O₄ nanoparticles. The magnetic nanoparticle stabilizer (MN-CHOL) was synthesized using the surface-initiated ATRP method with further modification that uses a specially designed cholesteryl derivative, and characterized by FT-IR, XPS, TGA, and magnetization measurements. It is confirmed that the resulting MN-CHOL shows a stronger interfacial activity, efficiently emulsifying C₄mim [PF₆] and water, and resultantly forming stable Pickering emulsions without the help of any co-surfactant. Due to its super paramagnetism and high saturation magnetization, MN-CHOL attached on the IL interface enables droplets of IL to be moved very conveniently on their target for as many times by an external magnetic field without demulsification, indicating high controllability and excellent stability. The resulting Pickering emulsion is a good extraction system that efficiently separates chlorobenzene, phenol, and methyl orange from aqueous solution. Subsequently, the simple magnetic separation was applied, to produce purified water due as a result of the rapid removal of organic pollutants from contaminated water.