Chinese Journal of Applied Chemistry ›› 2018, Vol. 35 ›› Issue (11): 1357-1363.DOI: 10.11944/j.issn.1000-0518.2018.11.180235

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Preparation and Catalytic Properties of MnOX-C@SiO2 Core-Shell Particles

MENG Qingnana*(),DU Lulua,TANG Yufeia,ZHAO Kanga,ZHAO Langbc   

  1. aSchool of Materials Science & Engineering,Xi'an University of Technology,Xi'an 710048,China;
    bState Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China
  • Received:2018-07-05 Accepted:2018-08-27 Published:2018-10-31 Online:2018-10-31
  • Contact: MENG Qingnan
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.51502241)

Abstract:

To prepare catalysts with high activity in the Fenton reaction toward the decomposition of pollutants in water, SiO2 coated polyacrylate and manganese dioxide composite colloids(PAA-Mn@SiO2) were carbonized under N2 atmosphere. The synthesis process is very facile and effective. The as-prepared manganese oxides-carbon@SiO2 core shell type catalyst (MnOX-C@SiO2) was characterized by X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), scanning electron microscope(SEM), transmission electron microscope(TEM) and the specific surface area analysis. The results indicate that low-valenced manganese oxides(Mn3O4 and MnO) are formed in the MnOX-C@SiO2 due to the reductive atmosphere formed by the pyrolysis of PAA, which is beneficial for the enhancement of the catalytic performance in the Fenton reaction. In addition, the SiO2 shell not only effectively prevents the inside manganese oxide nanoparticles from getting larger but also stops the product from aggregating during carbonation. The carbon component in the core can further stabilize the manganese oxide nanoparticles and promote the enrichment of organic pollutants. The specific surface area of the MnOX-C@SiO2 is 317.3 m2/g, which is well dispersed in water. For the catalytic degradation of methylene blue(MB) solution via the Fenton process, the degradation rate of MB can reach ~96.8% only after 40 min.

Key words: manganese oxide, carbon, silica, core-shell structure, catalysis