Fabrication of Poly（y-glutamic acid）-coated Fe3O4 Magnetic Nanoparticles and Their Application in Heavy Metal Removal  

Fabrication of Poly(γ-glutamic acid)-coated Fe3O4 Magnetic Nanoparticles and Their Application in Heavy Metal Removal

作　　者：常菁 仲兆祥 徐虹 姚忠 陈日志 

机构地区：[1]College of Food Science and Light Industry, Nanjing University of Technology, Nanjing 210009, China [2]State-Key Laboratory of Materials-Oriented Chemi-cal Engineering, JiangsuKey Laboratory of Industrial Water-Conservation & Emission Reduction, Nanjing University of Technology, Nanjing 210009, China

出　　处：《Chinese Journal of Chemical Engineering》2013年第11期1244-1250,共7页中国化学工程学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China （21276124）, the Research Project of Natural Science for Universities Affiliated to Jiangsu Province （10KJB530002）, Key Projects in the National Science ＆ Technology Pillar Pro-gram （2011BAE07B09-3）, the Jiangsu Provincial Science and Technology Support Program （BE2011831）, and the State High Technology Research and Development Prograr of China （2011AA02A201）.

摘　　要：In this study, poly（y-glutamic acid）-coated Fe3O4 magnetic nanoparticles （y-PGA/Fe304 MNPs） were successfully fabricated using the co-precipitation method. Fe3O4 MNPs were also prepared for comparison. The av erage size and specific surface area results reveal that 7-PGA/Fe304 MNPs （52.4 nm, 88.41 m2.g-1） have smaller particle size and larger specific surface area_ than Fe3O4 MNPs （62.0 nm, 76.83 mLg-1）. The y-PGA/Fe3O4 MNPsIn this study, poly(γ-glutamic acid)-coated Fe3 O4 magnetic nanoparticles(γ-PGA/Fe3 O4 MNPs) were successfully fabricated using the co-precipitation method. Fe3 O4 MNPs were also prepared for comparison. The average size and specific surface area results reveal that γ-PGA/Fe3 O4 MNPs(52.4 nm, 88.41 m2·g 1) have smaller particle size and larger specific surface area than Fe3 O4 MNPs(62.0 nm, 76.83 m2·g 1). The γ-PGA/Fe3 O4 MNPs can remove over 99% of Cr3+, Cu2+and Pb2+, and over 77% of Ni2+in deionized water, much higher than γ-PGA and Fe3 O4 MNPs, attributed to the larger specific surface area of γ-PGA/Fe3 O4 MNPs. With the solution pH higher than 6.0, γ-PGA/Fe3 O4 MNPs demonstrate better removal activity. The adsorption isotherm of γ-PGA/Fe3 O4 MNPs for Cr3+fits the Freundlich model well, with the adsorption capacity of 24.60 mg·g 1. γ-PGA/Fe3 O4 MNPs are strongly attracted by permanent magnet, so it is easy to separate them completely from water. With their high efficiency for heavy metal removal and easier separation, γ-PGA/Fe3 O4 MNPs have great potential applications in water treatment.

关 键 词：y-PGA magnetic nanoparticles Fe3fO4 heavy metal removal 

分 类 号：TQ138.11[化学工程—无机化工] Q523[生物学—生物化学]