中国化学工程学报(英文版)
中國化學工程學報(英文版)
중국화학공정학보(영문판)
CHINESE JOURNAL OF CHEMICAL ENGINEERING
2013年
11期
1244-1250
,共7页
常菁%仲兆祥%徐虹%姚忠%陈日志
常菁%仲兆祥%徐虹%姚忠%陳日誌
상정%중조상%서홍%요충%진일지
γ-PGA%magnetic nanoparticles%Fe3O4%heavy metal removal
In this study, poly(γ-glutamic acid)-coated Fe3O4 magnetic nanoparticles (γ-PGA/Fe3O4 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 thatγ-PGA/Fe3O4 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 m2·g-1). Theγ-PGA/Fe3O4 MNPs can remove over 99%of Cr3+, Cu2+and Pb2+, and over 77%of Ni2+in deionized water, much higher thanγ-PGA and Fe3O4 MNPs, attributed to the larger specific surface area ofγ-PGA/Fe3O4 MNPs. With the solution pH higher than 6.0,γ-PGA/Fe3O4 MNPs demonstrate better removal activity. The adsorption isotherm ofγ-PGA/Fe3O4 MNPs for Cr3+ fits the Freundlich model well, with the adsorption capacity of 24.60 mg·g-1. γ-PGA/Fe3O4 MNPs are strongly attracted by permanent magnet, so it is easy to separate them completely from water. With their high effi-ciency for heavy metal removal and easier separation,γ-PGA/Fe3O4 MNPs have great potential applications in wa-ter treatment.