Graphene-supported nickel ferrite: A magnetically separable photocatalyst with high activity under visible light

Authors

  • Yongsheng Fu,

    1. Key Laboratory of Soft Chemistry and Functional Materials, Nanjing University of Science and Technology, Ministry of Education, Nanjing 210094, China, and Key Laboratory of Fine Petrochemical Engineering, Changzhou University, Changzhou 213164, China
    Search for more papers by this author
  • Haiqun Chen,

    1. Key Laboratory of Fine Petrochemical Engineering, Changzhou University, Changzhou 213164, China
    Search for more papers by this author
  • Xiaoqiang Sun,

    1. Key Laboratory of Fine Petrochemical Engineering, Changzhou University, Changzhou 213164, China
    Search for more papers by this author
  • Xin Wang

    Corresponding author
    1. Key Laboratory of Soft Chemistry and Functional Materials, Nanjing University of Science and Technology, Ministry of Education, Nanjing 210094, China, and Key Laboratory of Jiangsu Province for Chemical Pollution Control and Resources Reuse, Nanjing University of Science and Technology, Nanjing 210094, China
    • Key Laboratory of Soft Chemistry and Functional Materials, Nanjing University of Science and Technology, Ministry of Education, Nanjing 210094, China, and Key Laboratory of Fine Petrochemical Engineering, Changzhou University, Changzhou 213164, China
    Search for more papers by this author

Abstract

A straightforward strategy is designed for the fabrication of a magnetically separable NiFe2O4-graphene photocatalyst with different graphene content. It is very interesting that the combination of NiFe2O4 nanoparticles with graphene sheets results in a dramatic conversion of the inert NiFe2O4 into a highly active catalyst for the degradation of methylene blue (MB) under visible light irradiation. The significant enhancement in photoactivity under visible light irradiation can be ascribed to the reduction of GO, because the photogenerated electrons of NiFe2O4 can transfer easily from the conduction band to the reduced GO, effectively preventing a direct recombination of electrons and holes. The results of the kinetic study indicated that the rate-determining stage is the adsorption process of MB molecules. NiFe2O4 nanoparticles themselves have a strong magnetic property, which can be used for magnetic separation in a suspension system, and, therefore, the introduction of additional magnetic supports is no longer necessary. © 2011 American Institute of Chemical Engineers AIChE J, 2012

Ancillary