Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (11): 20220472.doi: 10.7503/cjcu20220472

• Physical Chemistry • Previous Articles     Next Articles

Effects of Surface Hydrothermal Carbon Layer on the Photocatalytic Activity of Magnetic NiFe2O4 Octahedron

GUO Biao1, ZHAO Chencan1, LIU Xinxin1(), YU Zhou1, ZHOU Lijing1, YUAN Hongming2, ZHAO Zhen1()   

  1. 1.College of Chemistry and Chemical Engineering,Shenyang Normal University,Shenyang 110034,China
    2.State Key Laboratory of Inorganic Synthesis and Preparative Chemistry,College of Chemistry,Jilin University,Changchun 130012,China
  • Received:2022-07-11 Online:2022-11-10 Published:2022-08-12
  • Contact: LIU Xinxin,ZHAO Zhen E-mail:liuxinxin1114@163.com;zhenzhao@cup.edu.cn
  • Supported by:
    the Project of Education Office of Liaoning Province, China(LQN201909);the Natural Science Foundation of Liaoning Province, China(2019-ZD-0481);the Open Project of State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, China(2020-32)

Abstract:

A series of magnetic carbon-coated NiFe2O4 core-shell octahedron(NiFe2O4@C) was synthesized by hydrothermal carbonization of glucose. The thickness of carbon layer on the NiFe2O4 surface could be precisely tuned by controlling the content of glucose. The composition, structure, morphology and optical properties of NiFe2O4@C composites were characterized by X-ray diffraction(XRD), Raman spectroscopy(Roman), X-ray photoelectron spectroscopy(XPS), scanning electron microscopy(SEM), transmission electron microscopy(TEM) and UV-Vis diffuse reflectance spectroscopy(UV-Vis DRS). The photocatalytic performance for the MB-degradation of various NiFe2O4@C were explored. It is found that the photocatalytic activity strongly depended on the thickness of carbon layer on the surface of NiFe2O4. The NiFe2O4@C-3 with 5.5 nm carbon layer is endowed with the best photocatalytic performance for the MB photodegradation. Fluorescence spectroscopy(PL), transient photocurrent and electrochemical impedance spectroscopy(EIS) results show that the improvement of photocatalytic performance can be attributed to the formation of the heterojunction between the NiFe2O4 core and carbon shell, which effectively promotes the transmission and separation of photo-generated carriers. In addition, NiFe2O4@C possesses relatively high stability and retrievability, indicating that NiFe2O4@C has great potential for applications in sewage treatment.

Key words: Magnetism, NiFe2O4, Carbon coating, Core-shell structure, Photocatalysis

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