文献类型：期刊文献

英文题名：Composite of graphene quantum dots and Fe3O4 nanoparticles: peroxidase activity and application in phenolic compound removal

作者：Wu, Xiaochen[1];Zhang, Yan[1];Han, Ting[1];Wu, Haixia[1];Guo, Shouwu[1];Zhang, Jingyan[2]

机构：[1]Shanghai Jiao Tong Univ, Res Inst Micro Nano Sci & Technol, Key Lab Thin Film & Microfabricat, Minist Educ, Shanghai 200240, Peoples R China;[2]E China Univ Sci & Technol, Shanghai Key Lab New Drug Design, Sch Pharm, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China

年份：2014

卷号：4

期号：7

起止页码：3299

外文期刊名：RSC ADVANCES

收录：;EI(收录号：20135217140406);WOS:【SCI-EXPANDED(收录号:WOS:000329039000029)】；

基金：We thank the National Science foundation of China (no. 91123011, 90923041, 31070742), the state key laboratory of bioreactor engineering (no. 2060204), 111 Project (no. B07023), the Science and Technology Commission of Shanghai Municipality (no. 11DZ2260600 and 12nm0503500), and the National "863" Program of China (no. 2012AA022603) for the financial support of this work.

语种：英文

外文关键词：Chemicals removal (water treatment) - Graphene - Wastewater treatment - Solutions - Micrometers - Nanocomposites - Phenols - Industrial water treatment - Nanocrystals - Semiconductor quantum dots - Precipitation (chemical) - Reusability

摘要：Graphene quantum dots (GQDs) are graphene sheets with lateral sizes less than 100 nm, and have a higher electron conjugate state and a better dispersion ability in aqueous solution compared to micrometer-sized graphene oxide (GO) sheets. Therefore they can overcome the drawbacks of GO and are an ideal candidate for nano-composites. In this work, composites of GQDs and Fe3O4 nanoparticles (NPs) (GQDs/Fe3O4) were prepared via a one-step co-precipitation approach. The as-prepared GQDs/Fe3O4 composites showed superb peroxidase-like activities, which were much higher than composites of micrometer sized GO and Fe3O4 NPs (GO/Fe3O4), individual GQDs, and individual Fe3O4 NPs. The excellent peroxidase activities of the GQDs/Fe3O4 composites can be attributed to the unique properties of GQDs and the synergistic interactions between the GQDs and Fe3O4 NPs. The GQDs/Fe3O4 composites also exhibited a higher stability and reusability than natural peroxidases. The application of a GQDs/Fe3O4 composite as a catalyst for the removal of phenolic compounds from aqueous solutions was explored with nine phenolic compounds, and showed better or comparable removal efficiencies for some phenolic compounds compared to native horseradish peroxidase (HRP) under the same conditions. The extraordinary catalytic performance and physical properties of the as-prepared GQDs/Fe3O4 composite render it practically useful for industrial wastewater treatment.