A novel synthesis of magnetic and photoluminescent graphene quantum dots/MFe2O4 (M = Ni, Co) nanocomposites for catalytic application

作者：Naghshbandi Zhwan; Arsalani Nasser^*; Zakerhamidi Mohammad Sadegh; Geckeler Kurt E

来源：Applied Surface Science, 2018, 443: 484-491.

DOI：10.1016/j.apsusc.2018.02.283

• Graphene quantum dots
• NiFe2O4
• CoFe2O4
• p-Nitrophenol

In recent year, the research is focused on the nanostructured catalyst with increase physiochemical properties. Herein, Different magnetic nanocomposites of graphene quantum dots (GQD) and MFe2O4 (M = Ni, Co) with intrinsic photoluminescent and ferromagnetic properties were synthesized by a convenient co-precipitation method. The structure, morphology, and properties of these nanocomposites as well as the catalytic activity of the nanocomposites for the reduction of p-nitrophenol were investigated. The catalytic activity was found to be in the order of NiFe2O4/GQD > CoFe2O4/GQD > NiFe2O4 > CoFe2O4. The sample NiFe2O4/GQD exhibited the best catalytic activity with an apparent rate constant of 3.56 min(-1) and a reduction completion time to p-aminophenol of 60 s. The catalysts can be reused by a magnetic field and display good stability, which can be recycled for six successive experiment with a conversion percentage of more than 95%. These results demonstrate that the nanocomposite NiFe2O4/GQD is an efficient catalyst for the reduction of p-nitrophenol compound. Also, the new nanocomposites have shown a significant reduction in the direct and indirect energy bandgaps when compared to pure GQD and the corresponding magnetic metal oxides.

• 出版日期2018-6-15